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  • 1.
    Erikson, Martin G
    et al.
    University of Borås, Sweden.
    Eriksson, Anita
    University of Borås, Sweden.
    Johnson, Erland
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Nagy, Agnes
    University of Borås, Sweden.
    Richards, Tobias
    University of Borås, Sweden.
    A conceptual model of how research can influence student development2017In: Connecting Higher Education International perspectives on research-based education BOOK OF ABSTRACTS. Tues 27 June to Wed 28 June 2017. London, United Kingdom, 2017, p. 71-72, article id 86Conference paper (Refereed)
  • 2.
    Holmgren, Magnus Andreas
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Kjell, Gunnar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Lundh, Karin
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Misalignment in Fatigue Testing Machines, a Nordic Laboratory Intercomparison NICe project 041492006Report (Refereed)
  • 3.
    Holmgren, Magnus
    et al.
    RISE - Research Institutes of Sweden.
    Johansson, Klas
    RISE - Research Institutes of Sweden.
    Johnson, Erland
    RISE - Research Institutes of Sweden.
    Svensson, Thomas
    RISE - Research Institutes of Sweden.
    Inter-laboratory comparison of a fatigue test2005In: Materialprüfung, Vol. 47, p. 529-533Article in journal (Refereed)
  • 4.
    Håkansson, Måns
    et al.
    Saab Kockums, Sweden.
    Johnson, Erland
    RISE - Research Institutes of Sweden, Safety and Transport.
    Ringsberg, Jonas
    Chalmers University of Technology, Sweden.
    Cost and weight ofcomposite ship structures: A parametric study based on Det Norske Veritasrules?2017In: IMechE Part M - Journal of Engineering for the Maritime Environment, Vol. 232, no 3, p. 331-350Article in journal (Refereed)
    Abstract [en]

    A wider use of composites in larger, commercial vessels has been limited by initial costs and fire regulations, but both of these obstacles are diminishing. Increasing fuel costs and more stringent emission requirements have heightened the value of lightweight structures. Due to the higher acquisition costs and other entry barriers, composite designs must be as cost efficient as possible in order to compete with traditional steel or aluminium designs. The purpose of this article is to investigate which fibre-reinforced polymer materials and types of structures are most suitable for different parts of a ship design in order to minimize weight or cost. This is done by designing and comparing individual composite panels while varying a wide range of input parameters and strictly following the ‘Det Norske Veritas (DNV) Rules for Classification of High Speed, Light Craft and Naval Surface Craft’. The results are presented as weight and cost comparisons between materials and structures and also degree of utilization for the different design criteria; carbon fibre structures are on the average 20%–30% lighter than glass fibre structures but are consistently more expensive. The results also indicate that sandwich panels in most cases are lighter than single-skin panels, and that for sandwich structures, the mechanical properties of the core material are commonly the critical design criterion. The minimum amount of reinforcement stipulated by the rules is also found to be a critical factor.

  • 5. Högström, P
    et al.
    Ringsberg, J
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    An experimental and numerical study of the effects of length scale and strain state on the necking and fracture behaviours in sheet metals2009In: International Journal of Impact Engineering, Vol. 36, p. 1194-1203Article in journal (Refereed)
  • 6. Högström, P
    et al.
    Ringsberg, J
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Analysis of a struck ship with damage opening - influence from model and material properties uncertainties.2010Conference paper (Refereed)
  • 7. Högström, P
    et al.
    ringsberg, J
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Experimental verification of finite element failure criteria with respect to strain state and element size2009Conference paper (Refereed)
  • 8. Johansson, J
    et al.
    Belov, Ilja
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Dudek, R
    Leisner, Peter
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik.
    Investigation on thermal fatigue of SnAgCu, Cu100C, and SnPbAg solder joints in varying temperature environments2014In: Microelectronics Reliability, Vol. 54, no 11, p. 2523-2535Article in journal (Refereed)
  • 9. Johansson, J
    et al.
    Belov, Ilja
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Leisner, Peter
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik.
    A computational method for evaluating the damage in a solder joint of an electronic package subjected to thermal loads2014In: J. of Engineering Computations, Vol. 31, no 3, p. 467-489Article in journal (Refereed)
  • 10. Johansson, J
    et al.
    Leisner, Peter
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik.
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Belov, Ilja
    An approach to life consumption monitoring of solder joints in operating temperature environment2012Conference paper (Refereed)
  • 11.
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    A method for assessment of the survival time of a ship damaged by collision2011In: Transactions - Society of Naval Architects and Marine Engineers, ISSN 0081-1661, Vol. 119, p. 603-619Article in journal (Refereed)
  • 12.
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Analysis of Mooring Lines for Wave Energy Converters: A Comparison of De-Coupled and Coupled Simulation Procedures2014In: ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering, 2014, , p. Paper No. OMAE2014-23377, pp. V04AT02A034Conference paper (Refereed)
  • 13.
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Measurement of forces and neutral temperatures in railway rails - an introductory study2004Report (Refereed)
    Abstract [sv]

    Railway business (both in Sweden and internationally) is in need of efficient and non-destructive methods for convenient measurements of the neutral temperature. Banverket has hitherto made some investigations of different such methods and this analysis aims in this perspective to · Identify different techniques and methods that are possible to use for measuring the neutral temperature and sort out those that are not useful for rail applications. · Give the theoretical basis for each method in order to obtain a firm base for further investigations and judgements. · Perform critical examinations of the development potential, cost and time consumption for each of the methods and identifying those methods and equipments that are of most interest for further investigations. · Identify additional actions to be taken in combination with efficient neutral temperature determinations for reduction of the heat distortion risk in CWR-tracks. The following methods are possible candidates for further investigations: Ultrasonic methods Based on either the longitudinal wave principle or the birefringence principle with methods developed by, for example, NIST and RIPL. Deformation methods Based on measurements of either strains or of positions with commercial methods as the Pfender device, the MS-02 device, the MP method or the geodesic method. Magnetic methods The Barkhausen noise principle seems to be more promising than the magnetic parameter method with developed testing methods by Railscan, Railtest and Rollscan. X-ray diffraction method Based on diffraction of X-rays in crystal planes, portable equipment exists although the method has traditionally been used under laboratory conditions. Rail vibration techniques method Based on the relation between stiffness and force in combination with an accurate laser measurement system, this method is a promising alternative. In parallel to improved measurement techniques for neutral temperature, a list of possible additional actions has been identified. These are additional logical ways to reduce the risk for rail heat distortions and they do not have any technical solutions today. The author is currently not aware of all possible efforts that have been made regarding these issues but they should be kept in mind during future work. For example: · Could rail cooling be performed by heat conduction to the cooler regions below the track? · Should the neutral temperature be increased (cf. chapter 3)? · Could rail grinding improve the mechanical integrity? · Are there possible modifications of the CWR-concept itself that could reduce the thermal stress build up? · One obvious action is to improve the lateral resistance of the track region. This is the main focus of the accompanying report within this preliminary study. This preliminary study shows that there exist promising methods that would improve the measurements of neutral temperature. When this preliminary study is completed, it is therefore proposed that actions are taken for more detailed investigations of the one or two most promising methods. This should be done through field studies and laboratory studies in Sweden but also, where appropriate, through visits to places in Europe where the methods have been evaluated. It would also be of interest to study additional ways of reducing the risk for rail heat distortions.

  • 14.
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Modelling approaches for reliability estimations of fibre-reinforced plastic laminates2014In: Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE 2014, 2014Conference paper (Refereed)
  • 15.
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik, Strukturer och Komponenter.
    Optimization of composite maritime structures - effects of uncertainties on design criteria limits.2011In: Proceedings of the Third International Conference on Marine Structures (MARSTRUCT2011), 2011, , p. 707-714Conference paper (Refereed)
  • 16.
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Simulations of microcracking in the process region of ceramics with a cell model2001In: International journal of fracture, Vol. 111, no 4, p. 36-380Article in journal (Other academic)
  • 17.
    Johnson, Erland
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Högström, P
    Schreuder, M
    Jansson, E
    A method for assessment of the survival time of a ship damaged by collision.2011In: Journal of Ship Research, Vol. 55, no 2, p. 86-99Article in journal (Refereed)
  • 18.
    Johnson, Erland
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Högström, P
    Schreuder, M
    Jansson, E
    Survivability analysis of a struck ship with damage opening - influence from model and material properties uncertainties2011In: Ships and Offshore Structures, ISSN 1744-5302, E-ISSN 1754-212X, Vol. 6, no 4, p. 339-354Article in journal (Refereed)
  • 19.
    Johnson, Erland
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Johansson, Klas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Svensson, Thomas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Holmgren, Magnus
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Reflections regarding uncertainty of measurement, on the results of a Nordic fatigue test interlaboratory comparison2005In: Accreditation and Quality Assurance, ISSN 0949-1775, E-ISSN 1432-0517, Vol. 10, no 5, p. 208-213Article in journal (Refereed)
  • 20.
    Johnson, Erland
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Kjell, Gunnar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Ultrasonic monitoring of a fiber reinforced plastic - Steel composite beam during fatigue2012In: Proceedings of the 6th European Workshop - Structural Health Monitoring 2012, EWSHM 2012, 2012, , p. 1254-1260Conference paper (Refereed)
  • 21.
    Johnson, Erland
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Svensson, Thomas
    Choice of Complexity in Constitutive Modelling of Fatigue Mechanisms.2009In: Robust Design Methodology for Reliability: Exploring the Effects of variation and uncertianity / [ed] edited by redigerad av Bo Bergman,Jacques de Mare,Thomas Svensson,Sara Loren, 2009, p. 133-144Chapter in book (Other academic)
  • 22.
    Johnson, Erland
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Svensson, Thomas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Choice of complexity in constitutive modelling of fatigue mechanisms2005Report (Refereed)
    Abstract [en]

    The uncertainties in the virtual design stages of the product development chain are considered. The current computer capacity enables the processing of complex models to handle these steps. However, in the present work it is shown that the prediction capacity is not always favoured by an increased model complexity. In fact, it is observed that the prediction capacity deteriorates when the complexity exceeds a certain level. An example is shown and its implication for fatigue design are discussed. Key words: fatigue, model complexity, prediction uncertainty

  • 23.
    Johnson, Erland
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Yang, S-H
    Ringsberg, J
    The influence of biofouling on power capture and the fatigue life of mooring lines and power cables used in wave energy converters.2016In: Progress in Renewable Energies Offshore – Proceedings of RENEW 2016, the Second International Conference on Renewable Energies Offshore, Lisbon, Portugal, October 24-26. / [ed] Guedes Soares, 2016, p. 711-722Conference paper (Other academic)
    Abstract [en]

    This study presents an analysis of a wave energy converter (WEC) system consisting of a buoy, a mooring system and a power cable connected to a hub. The investigated WEC system is currently under full-scale testing near Runde in Norway. The purpose of the study was to investigate the characteristics of the entire system, primarily with regard to energy performance and the fatigue life of the mooring lines and power cable, considering the effects of marine biofouling and its growth on the system’s components. The energy performance of the system and the fatigue life of the mooring lines and the power cable were systematically studied via parameter variation analysis, considering different mooring configurations, biofouling conditions, and environmental loads (current and sea state conditions), among other factors. Hydrodynamic and structural response simulations were conducted in a coupled response analysis using the DNV-GL software SESAM. Energy performance analyses and stress-based rainflow counting fatigue calculations were performed separately using an in-house code. The results show that, for a WEC system which has been deployed for 25 years, biofouling can reduce the total power absorption by up to 10% and decrease the fatigue life of the mooring lines by approximately 20%.

  • 24. Karlsson, U
    et al.
    Ringsberg, J
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Hoseini, M
    Ulfvarsson, A
    Experimental and numerical investigation of bulb impact with a ship side-shell structure.2009In: Marine Technology, Vol. 46, p. 16-26Article in journal (Refereed)
  • 25. Karlsson, U
    et al.
    Ringsberg, J
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Hoseini, Mohammed
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Ulfvarsson, A
    Experimental and numerical investigation of bulb impact with a ship side-shell structure2009In: Marine Technology, ISSN 0025-3316, Vol. 46, no 1, p. 16-26Article in journal (Refereed)
  • 26. Karlsson, U
    et al.
    Ulfvarsson, A
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Kjell, Gunnar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Stress and Fatigue Analysis of a Bow-Door Arm2007In: Journal of Engineering for the Maritime Environment, no 221, p. 125-136Article in journal (Refereed)
  • 27.
    Kjell, Gunnar
    et al.
    RISE - Research Institutes of Sweden.
    Johnson, Erland
    RISE - Research Institutes of Sweden.
    Measuring axial forces in rail by forced vibrations - experiences from a full scale laboratory experiment2009In: IMechE, Part F: Journal of Rail and Rapid Transit., Vol. 223, no 3, p. 241-254Article in journal (Refereed)
    Abstract [en]

    The longitudinal load in rail caused by thermal expansion must be regularly monitored in order to avoid buckling or rail fracture. Different methods of monitoring with benefits and drawbacks are used or suggested. In this paper one of the proposed methods is investigated by a full-scale experiment. The aim is to measure the change in wavelength of the bending wave caused by the longitudinal load. In contrast to other vibration methods, this method does not require knowledge of the boundary conditions. However, it requires very accurate measurements, advanced finite element (FE) calculations, and sophisticated data analyses. The full-scale experiment shows that this is a method with potential. On the basis of the results of the full-scale experiment the required accuracy of the different steps in the method are clarified. Influence of measurement accuracy, loosened clamps at the sleepers, FE mesh size, degree of wear of the rail, and inaccuracy in the material parameters is considered.

  • 28.
    Lang, Xiao
    et al.
    Chalmers University of Technology, Sweden.
    Yang, SH
    Ringsberg, Jonas
    Chalmers University of Technology, Sweden.
    Johnson, Erland
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Rahm, Magnus
    Chalmers University of Technology, Sweden.
    Guedes Soares, Carlos
    Univerisity of Lisbon, Portugal.
    Comparison betweenfull-scale measurements and numerical simulations of mooring forces in afloating point-absorbing WEC system.2018In: Advances in Renewable Energies Offshore - Proceedings of The 3rdInternational Conference on Renewable Energies Offshore (RENEW 2018),, 2018, p. 865-876Conference paper (Refereed)
  • 29. Li, Z
    et al.
    Mao, W
    Ringsberg, J
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Storhaug, G
    A comparative study of fatigue assessment of a container ship structure using various direct calculation approaches2012In: Proceedings of the International Conference on Maritime Technology (ICMT2012) in Harbin, Heilongjiang, P. R. China, June 25-28, 2012, 2012, p. 405-409, article id H95Conference paper (Refereed)
    Abstract [en]

    Today, it is common practice to carry out fatigue assessments of ship structures using direct calculation procedures. Many numerical codes are available for these types of analyses. They could yield different values in a fatigue life prediction due to the different degrees of complexity as well as the large number of uncertainties in the computation of the ship’s response. In this investigation, a comparative study is carried out on a Panamax container ship in oblique waves using different typical direct calculation methods. The results of fatigue life prediction using these methods are compared with results obtained from full-scale measurements. It is found that the nonlinear time-domain method shows the best agreement with the full-scale measurements, and therefore, it is recommended to be used in fatigue predictions.

  • 30.
    Li, Zhiyuan
    et al.
    Chalmers University of Technology, Sweden.
    Ringsberg, Jonas
    Chalmers University of Technology, Sweden.
    Johnson, Erland
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Performance assessment of the crashworthiness of corroded ship hulls.2017In: Proceedings of the Sixth International Conference on Marine Structures (MARSTRUCT2017), Lisbon, Portugal, May 2017, 2017, p. 523-532Conference paper (Refereed)
  • 31. Li, Z.S.
    et al.
    Mao, W
    Ringsberg, Jonas
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Storhaug, G
    A comparative study of fatigue assessments of container ship structures using various direct calculation approaches.2014In: Ocean Engineering, ISSN 0029-8018, E-ISSN 1873-5258, Vol. 82, p. 65-74Article in journal (Refereed)
  • 32.
    Lillbacka, Robert
    et al.
    SP.
    Ekh, Magnus
    Chalmers.
    Johnson, Erland
    RISE - Research Institutes of Sweden.
    Runesson, Kenneth
    Chalmers.
    Fatigue crack initiation based on simulations at the mesoscopic scale2003In: Proceedings of the 5th International Conference of the Engineering Society, Cambridge, UK 7-9 April 2003, 2003, p. 475-484Conference paper (Refereed)
  • 33.
    Lillbacka, Robert
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Ekh, Magnus
    Chalmers.
    Runesson, Kenneth
    Chalmers.
    Johnson, Erland
    RISE - Research Institutes of Sweden.
    Anisotropic damage modelling based on mesoscopic simulations2002In: Proceedings of the 5th World Congress on Computational Mechanics. July 7-12, 2002., 2002Conference paper (Refereed)
  • 34.
    Lillbacka, Robert
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Cyclic Stress-Strain Behavior and Load-sharing in duplex Stainless Steels - Aspects on Modeling and Experiments2007In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 55, no 16, p. 5359-5368Article in journal (Refereed)
  • 35.
    Lillbacka, Robert
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Bellander, Magnus
    Rubber component fatigue life evaluation based on FE-modelling and material testing2009Conference paper (Other academic)
  • 36.
    Lillbacka, Robert
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Ekh, Magnus
    A model for short crack propagation in polycrystalline materials.2006In: Engineering Fracture Mechanics, Vol. 73, no 2, p. 223-232Article in journal (Refereed)
    Abstract [en]

    A model for microstructurally short crack propagation in a grain structure of a polycrystalline material is developed. The crack propagation model is based on a crystal plasticity model and a microstructurally short crack propagation model in the spirit of the model by Navarro and de los Rios [A model for short fatigue crack propagation with an interpretation of the short–long crack transition. Fatigue Fract Eng Mater Struct 1987;10:169–86]. Numerical examples, where the combined crystal plasticity and crack propagation model is implemented in a model of a microstructure representing a duplex stainless steel, concludes the paper. Results showing how the misorientation of the crack- and slip-directions between two adjacent austenitic grains influences the crack propagation rate, as the crack propagates across their common grain boundary, are given.

  • 37.
    Lillbacka, Robert
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Ekh, Magnus
    A model for short crack propagation in polycrystalline materials2005In: Engineering Fracture Mechanics, Vol. 73, no 73, p. 223-232Article in journal (Refereed)
  • 38.
    Lillbacka, Robert
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Johnson, Erland
    RISE - Research Institutes of Sweden.
    Ekh, Magnus
    Chalmers.
    Runesson, Menneth
    Chalmers.
    Modelling growth of small cracks in a polycrystal2004In: Proceedings of the 15th European Conference of Fracture, Stockholm, Sweden, 11-13 August 2004., 2004Conference paper (Refereed)
  • 39.
    Rahm, Michael
    et al.
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Evegren, Franz
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Johnson, Erland
    RISE - Research Institutes of Sweden, Built Environment.
    Ringsberg, Jonas
    Chalmers University of Technology, Sweden.
    Structural Fire Integrity Testing of Lightweight Multiple Core Sandwich Structures2017In: Proceedings of the 6th International Conference on Marine Structures - MARSTRUCT. Progress in the Analysis and Design of Marine Structures, 2017, p. 869-878Conference paper (Refereed)
    Abstract [en]

    Lightweight structures become increasingly important to reduce environmental impact and to improve payload/deadweight ratio of ships. Significant weight savings can be accomplished by replacing steel with fiber reinforced polymer (FRP) sandwich panels. An assessment is then necessary to ensure that equivalent fire safety is provided, since the structures are combustible. To support such assessments, this paper presents results from vertically loaded fire resistance tests of two structures: (1) a “conventional” FRP sandwich bulkhead with thermal insulation (providing load carrying fire resistance for 60 minutes) and (2) a multiple core FRP sandwich bulkhead without insulation. Both bulkheads were constructed for and tested with the same design load. The multiple core sandwich bulkhead demonstrated structural fire integrity performance well beyond 60 minutes whilst having a significantly lower structural weight and thickness. The new type of multiple core sandwich structure thus provides great potential, both from a weight-savings and a fire safety perspective.

  • 40. Ringsberg, J
    et al.
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Schreuder, M
    Högström, P
    Examples of selected research efforts made on characteristics of material, ship side structure response and ship survivability in ship collisions.2010Conference paper (Refereed)
  • 41.
    Ringsberg, Jonas
    et al.
    Chalmers University of Technology, Sweden.
    Jansson, Hanna
    Chalmers University of Technology, Sweden.
    Yang, Shun Han
    Chalmers University of Technology, Sweden.
    Örgård, Martin
    Chalmers University of Technology, Sweden.
    Johnson, Erland
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Comparison of mooring solutions and array systems for point absorbing wave energy devices2018In: Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE, 2018Conference paper (Refereed)
    Abstract [en]

    Most of the ocean energy technologies are considered to be ina pre-commercial phase and need technical development. Thisstudy focuses on design of mooring solutions and comparesarray systems of a specific floating point-absorbing waveenergy converter (WEC) developed by the companyWaves4Power. A full-scale prototype of the WEC is installedin Runde (Norway) where it is moored with three polyestermooring lines, each having one floater and one gravity anchor.Based on this reference installation, the method of systemsengineering was used to propose twenty-two conceptualmooring solutions for different array systems. They werecompared and reduced to four top concepts in a systematicelimination procedure using Pugh and Kesselring matrices. Thetop concepts were assessed in detail by means of LCOE(levelised cost of energy), LCA (life cycle analysis) and riskanalyses. The fatigue life of the mooring lines and the energycapture were calculated using results obtained from coupledhydrodynamic and structure response analyses in the DNV-GLDeepC software. Two final concepts were proposed for thewater depths 75 and 200 m.

  • 42.
    Ringsberg, Jonas
    et al.
    Chalmers University of Technology, Sweden.
    Johnson, Erland
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Zhang, Meng
    KTH Royal Institute of Technology, Sweden.
    Yu, Y
    Chalmers University of Technology, Sweden.
    Shock analysis of a stern ramp using dynamic design analysis method2017In: Proceedings of the ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2017), Trondheim, Norway, June 25-30 2017., 2017Conference paper (Refereed)
    Abstract [en]

    Shock load caused by underwater explosion in naval battles can lead to malfunction of the equipment on-board naval vessels. It makes the ships vulnerable and they can lose the ability to accomplish their missions. This study presents a shock analysis, using the dynamic design analysis method (DDAM), of a naval ship stern ramp subjected to a non-contact underwater explosion. The objective is to evaluate the performance of the ramp subjected to a shock load, identify areas for structural improvements and recommend design changes. The DDAM in the commercial software ANSYS is used in the evaluation of the ramp. The structural response to the shock load is estimated by combined modal and response spectrum analyses. The shock load is applied in three directions (vertical, fore and aft, athwart ships) and the results show that the vertical direction is the most severe loading direction and critical to the functionality of the ramp. A parametric study is presented which shows which parameters that influence the most the structural response. The results from this study are used to suggest improvements of the ramp structure to make it more resistant to shock loads.

  • 43.
    Ringsberg, Jonas
    et al.
    Chalmers University of Technology, Sweden.
    Li, Zhijuan
    Chalmers University of Technology, Sweden.
    Kuznecovs, Artjoms
    Chalmers University of Technology, Sweden.
    Johnson, Erland
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Analysis of theultimate strength of corroded ships involved in collision accidents andsubjected to biaxial bending.2018Conference paper (Other academic)
    Abstract [en]

    This study presents an analysis of the effects of sudden damage, and progressive deterioration due to corrosion, on the ultimate strength of a ship which has been collided by another vessel. Finite element analyses (FEA) of collision scenarios are presented where factors are varied e.g. the vessels involved in the collision, and consider-ation of corroded ship structure elements and their material characteristics in the model. The striking ship is a coastal tanker, the struck ship is either a RoPax ship, or, a coastal oil tanker vessel. The ultimate strength analy-sis of the struck vessel accounts for the shape and size of the damage opening from the FEA. The Smith method is used to calculate the ultimate strength of intact and damaged ship structures during biaxial bending. The study shows how corroded, collision-damaged ship structures suffer from a reduction in crashworthiness and ultimate strength, how this should be considered and modelled in FEA.

  • 44.
    Ringsberg, Jonas W.
    et al.
    Chalmers University of Technology, Sweden.
    Li, Zhiyuan
    Chalmers University of Technology, Sweden.
    Johnson, Erland
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Kuznecovs, Artjoms
    Chalmers University of Technology, Sweden.
    Shafieisabet, Roozbeh
    Chalmers University of Technology, Sweden.
    Reduction in ultimate strength capacity of corroded ships involved in collision accidents2018In: Ships and Offshore Structures, ISSN 1744-5302, E-ISSN 1754-212X, Vol. 13, p. 155-166Article in journal (Refereed)
    Abstract [en]

    The objective of the study is to investigate the effects of sudden damage, and progressive deterioration due to corrosion, on the ultimate strength of a ship which has been collided by another vessel. Explicit finite element analyses (FEA) of collision scenarios are presented where factors are varied systematically in a parametric study, e.g. the vessels involved in the collision, and consideration of corroded ship structure elements and their material characteristics in the model. The crashworthiness of the struck ships is quantified in terms of the shape and size of the damage opening in the side-shell structure, and the division of energy absorption between the striking and struck ships for the different collision simulations. The ultimate strength of the struck ship is calculated using the Smith method and the shape and size of the damage openings from the FEA. In conclusion, the study contributes to understanding of how corroded, collision-damaged ship structures suffer significantly from a reduction in crashworthiness and ultimate strength, how this should be considered and modelled using the finite element method and analysed further using the Smith method.

  • 45.
    Ringsberg, JW
    et al.
    Chalmers University of Technology, Sweden.
    Li, Z
    Chalmers University of Technology, Sweden.
    Johnson, Erland
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Kuznecovs, A
    Chalmers University of Technology, Sweden.
    Shafieisabet, R
    Chalmers University of Technology, Sweden.
    Reduction in ultimate strength capacity of corroded ships involved in collision accidents2017Conference paper (Other academic)
    Abstract [en]

    There are many studies in the literature which present advanced numerical simulations of the assessment of the crashworthiness of marine structures. Most of these studies have not considered the effect of corrosion as an impairment of the struck structure’s resistance to the collision load and the consequence on the ship’s ultimate strength. The objective of the current investigation is to study the effects of sudden damage (ship-ship collision), and progressive deterioration due to corrosion, on the ultimate strength of a ship which has been collided by another vessel. Explicit finite element analyses of collision scenarios are presented where several factors are varied systematically in a parametric study, e.g. the vessels involved in the collision, and consideration of corroded ship structure elements and their material characteristics in the model. The striking ship is represented by a coastal tanker while the struck ship is either a RoPax ship, or, a coastal oil tanker vessel. The crashworthiness of the struck vessels is quantified in terms of the shape and size of the damage opening in the side-shell structure, and the division of energy absorption between the striking and struck ships for the different collision simulations. The ultimate strength of the struck vessel, for each collision simulation, is calculated using the Smith method and the shape and size of the damage openings from the finite element analyses. In conclusion, the study contributes to understanding of how corroded, collision-damaged ship structures suffer significantly from a reduction in crashworthiness and ultimate strength, how this should be considered and modelled using the finite element method and analysed further using the Smith method

  • 46.
    Sanchez, Luis
    et al.
    Chalmers University of Technology, Sweden.
    Ringsberg, Jonas
    Chalmers University of Technology, Sweden.
    Johnson, Erland
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Effective use of composite marine structures: Reducing weight and acquisition cost: Chapter 62019In: Marine Composites : Design and Performance  (A volume in Woodhead Publishing Series in Composites Science and Engineering) / [ed] Richard Pemberton, John Summerscales and Jasper Graham-Jones, 2019, p. 161-183Chapter in book (Other academic)
    Abstract [en]

    Composite structures are a way to reduce the operational costs of a vessel or to increase its potential revenue. However, depending on the design of the vessel, its operational profile, and the business model of the owner, the benefits brought by a composite structure may not justify its acquisition cost. This paper presents a number of investigations aimed at reducing the acquisition cost of marine composite structures and maximizing their benefits through a more effective use of composite materials (in other words, weight reduction of the composite structure). The investigations cover three areas of opportunity for doing so: material safety factors, material characterization, and numerical optimization of large composite structures. The following conclusions are drawn from the investigations: motivating a reduction of material safety factors through probabilistic analyses is unpractical at best, and questionable at worst; improving the material characterization of textile composites is easy, relatively costless, and can modestly reduce structural weight through better material property values; numerical optimization of large composite structures is cumbersome, but feasible, and holds the greatest potential increasing the economical attractiveness of composite marine structures.

  • 47.
    Schreuder, Martin
    et al.
    Chalmers.
    Hogström, Per
    Chalmers.
    Ringsberg, Jonas
    Chalmers.
    Janson, Carl-Erik
    Chalmers.
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.
    Experimental verification of finite element failure criteria with respect to strain state and element size2009In: Proceedings of 12th International Conference on Fracture, Ottawa, Canada, 12-17 July 2009., 2009Conference paper (Refereed)
  • 48. Schreuder, Martin
    et al.
    Hogström, Per
    Ringsberg, Jonas
    Janson, Carl-Erik
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Holistic assessment of ship survivability and risk after damage2009In: Proceedings of the Third International Conference on Computational Methods in Marine Engineering (MARINE 2009) in Trondheim, Norway, June 15-17, 2009 (Editors T. Kvamsdal, B. Pettersen, P. Bergan, E. Onate and J. Garcia), International Center for Numerical Methods in Engineering (CIMNE), Barcelona, Spain, 2009, p. 347-351Conference paper (Refereed)
  • 49.
    Svensson, Thomas
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Optimal experimental design for estimating crack closure features2004In: International Journal of Fatigue, Vol. 26, no 7, p. 705-716Article in journal (Refereed)
    Abstract [en]

    Recently, a new method for determining crack closure properties of a material has been presented. the method is convenient for engineering purpose, since it does not include any observations of the closure, but only uses results from fatigue life tests. In this paper we introduce the concept of optimal experimental design and use it for finding an optimal test design for the closure determining method. The resulting design is shown to give the same precision as the design used in previous investigations using only 60% of teh number of tests. A new series of fatigue tests was made according to the new design and the closure model parameters were estimated.

  • 50. Sánchez, L
    et al.
    Ringsberg, J
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Effects of matrix cracking on the estimation of operational limits of FRP laminates.2012In: Proceedings of the ECCM15 conferenc, 2012Conference paper (Refereed)
12 1 - 50 of 58
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