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  • 1.
    Albrektsson, Joakim
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Flansbjer, Mathias
    Hållfasthet (BMh).
    Lindqvist, Jan-Erik
    Brandteknik, material (BRm).
    Jansson, Robert
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Assessment of concrete structures after fire2011Report (Refereed)
  • 2.
    Albrektsson, Joakim
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Flansbjer, Mathias
    Hållfasthet (BMh). SP Sveriges tekniska forskningsinstitut.
    Lindqvist, Jan-Erik
    Brandteknik, material (BRm). SP Sveriges tekniska forskningsinstitut.
    Jansson, Robert
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd. SP Sveriges tekniska forskningsinstitut.
    Assessment of fire exposed concrete with full-field strain determination2011In: Proceedings pro080 : 2nd International Workshop on Concrete Spalling due to Fire Exposure., RILEM , 2011, , p. 337-344Conference paper (Refereed)
  • 3.
    Albrektsson, Joakim
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Jansson, Robert
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Flansbjer, Mathias
    Hållfasthet (BMh).
    Lindqvist, Jan-Erik
    Brandteknik, material (BRm).
    Quantification of fire damage of concrete for tunnel applications2012In: Proceedings from the Fifth International Symposium on Tunnel Safety and Security, SP , 2012, , p. 685-694Conference paper (Other academic)
  • 4.
    Andersson, Klas-Gustaf
    Hållfasthet (BMh).
    Provning av bomhållare för ridsport1997Report (Refereed)
  • 5.
    Andersson, Lars
    Hållfasthet (BMh).
    Container lashing rationale2001Report (Refereed)
  • 6.
    Andersson, Lars
    Hållfasthet (BMh).
    Packages for liquids - Internal Pressure Test2008Report (Refereed)
    Abstract [en]

    The basic requirements for transport of dangerous gods are that a packaging shall be able to withstand certain mechanical and chemical stresses, as stated in SRVFS 2006:7. The requirements shall guarantee a reasonable level of protection for both humans and environment and is intended to create a system taking into account different types of substances and packaging. Principles for classification, packing requirements, testing procedures shall be simple and clear and guarantee that a minimum level of safety can be achieved without advanced technical equipment and expertise. No requirements concerning test temperatures are given in the regulations but in the standard SS-EN-ISO 16104:2003 “Packaging – Transport packaging for dangerous goods – Test Methods” the internal hydraulic pressure test, for plastics drums, jerricans and composite packaging, shall be performed at a temperature of +12 °C, otherwise the internal test pressure shall be adjusted with a pressurization factor corresponding to the temperatures used in the test. At temperatures below +12 +/- 2 °C the test pressure is increased and if the temperature is higher the pressure is lowered. Correction factors exist from +2 °C to +20 °C, and for all temperatures above +20 °C the correction factor is the same as for +20 °C. Neither ADR, IMDG-code, ICAO-TI or the UN-recommendations recommend any test temperature. The aim with this project was to perform internal pressure test at different water temperatures. Three jerricans of each type were tested at the following temperatures: +3, +20, +40 and +55 °C. As can be seen in the test results the burst pressure decreases substantially with rising temperature. For jerrican A the burst pressure is reduced from 234 kPa at +3 °C to 175 kPa at +20 °C, 151 kPa at 40 °C and 114 kPa at +55 °C. At +55 °C the burst pressure is reduced to less than half what it was at +3 °C. Jerrican B is also reduced from 545 kPA at +3 °C to 226 kPa at +55 °C while jerrican C is only reduced from 185 kPa to 136 kPa in the same temperature interval. The gradient of the correction factor in table 3 in EN ISO 16104:2003 correspond very well with gradient of the tested jerricans in the temperature span between +2 °C and +20 °C. All jerricans were made of PE. The pressure/temperature curves show a linear gradient but indicates that the gradient can differ between different materials. Jerrican A and B are produced by the same manufacturer in the same material and show corresponding behaviour, also corresponding to the correction factors in the standard. Jerrican C is produced by another manufacturer and does not show such significant reduction of burst pressure at higher temperatures.

  • 7.
    Andersson, Lars
    et al.
    Hållfasthet (BMh).
    Möller, Anders
    Waller, Erica
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik, Strukturer och Komponenter.
    Fönsterlyft2013Report (Refereed)
    Abstract [sv]

    Detta projekt syftar till vidareutveckling av en uppfinning som har potential att väsentligen förenkla och effektivisera ett arbetsmoment, att lyfta av och på utåtgående sidohängda fönster, som är ett välkänt arbetsmiljöproblem. Resultatet från undersökningen visar att verktyget har utvecklingsmöjligheter och att radikalt minskar de ergonomiska problemen och att användningen kan ge goda möjligheter att effektivisera arbetet. Verktyget måste betraktas som ett lyftredskap och omfattas av därför av ett regelverk som innebär att vissa kriterier måste uppfyllas. Undersökningar i detta projekt visar att verktyget uppfyller de formella krav som ställs på det. Undersökningen visar också att det fungerar på avsett sätt dvs för att lyfta ur och sätta tillbaka utåtgående sidohängda fönster. Verktyget har provats av branschfolk som varit positiva till lösningen men bedömt den som svår att använda beroende på att den består av för många delar och att det är en stor förändring jämför med dagens arbetssätt med två man i arbetslaget. Med hänsyn tagen till de synpunkter som kommit från branschfolk i detta projekt är ett naturligt nästa steg att förenkla och anpassa verktyget till ett tvåmansverktyg. Verktyget blir då mer lättanvänt för ett arbetslag på två personer. Tillverkningskostnaden blir dessutom lägre för det anpassade verktyget. Om den förenklade lösningen får ett genomslag på marknaden innebär detta att företaget kommer igång med försäljning och produktion. I ett senare skede kan företaget vidareutveckla och marknadsintroducera det enmans-verktyg som var ursprunget till detta projekt och som fortfarande bedöms vara den allra effektivaste lösningen för arbetsmomentet att lyfta av och på fönster.

  • 8.
    Bergström, Gunnar
    et al.
    Göteborg (BMg).
    Flansbjer, Mathias
    Hållfasthet (BMh).
    Karlsson, Linda
    Hållfasthet (BMh).
    Sällberg, Sven-Erik
    Göteborg (BMg).
    Thörnblom, Kristian
    Göteborg (BMg).
    Acceptanskriterier för repor och intryck i plaströr2009Report (Other (popular science, discussion, etc.))
  • 9.
    Bergström, Gunnar
    et al.
    Göteborg (BMg).
    Flansbjer, Mathias
    Hållfasthet (BMh).
    Karlsson, Linda
    Hållfasthet (BMh).
    Sällberg, Sven-Erik
    Göteborg (BMg).
    Thörnblom, Kristian
    Göteborg (BMg).
    Acceptanskriterier för repor och intryck i plaströr Accpetance criteria for scratches and indentations in plastic pipes2009Report (Refereed)
    Abstract [sv]

    Development of materials and laying techniques have arisen the question how scratches and indentations in plastics pipes affect the strength and technical lifetime of pipelines. Scratches may occur both in the manufacturing of the pipes, in connection with the installation and subsequent maintenance. The problems in assessing the failure risk from scratches and indentations are similar for pipes used in gas and water distribution and in district heating applications. Therefore, a broad effort to identify the risks in relation to current pipe materials is technically and economically justified. The project has aimed to evaluate the effect of scratches and indentations on the technical lifetime of plastics pipes and to present criteria for maximum allowable depth of scratches and indentations. The study on pressure pipes focused on the conditions for scratched polyethylene pipes to achieve a lifetime of 50 years. It is noted that a scratch damage can not be judged solely on the basis of its depth and sharpness. To assess the impact of the scratch on the serviceability of the pipe, consideration must also be taken to the material from which the pipe was made and the safety factor used in the design. Extensive pressure tests show that pipes made of modern materials can withstand surface scratches to a higher degree than pipes of older materials. For pipes made of modern bimodal PE80 and PE100 materials, scratches up to 10% depth may be accepted without reduction of rated pressure. However, for pipes of older material, a reduction in pressure may be required already at smaller scratches. The study also indicates that for the same relative scratch depth, a greater reduction in pressure is required with increasing pipe dimension. The study on the non pressure pipes shows that the studied polypropylene pipes resist both deep scratches combined with ovalization and large indentations without any cracks penetrating the pipe wall. However, the extent and development of crazing and surface cracking vary with scratch depth, deformation level and material. The test pipes were subjected to extreme conditions very rarely or never occurring in practice. This suggests that small scratches at moderate ovalization and realistic indentations in temperatures around room temperature do not affect the lifetime of the pipes. One objective of the project was to develop a method for the evaluation of the scratch resistance of a pipe. In the proposed test method the force needed to produce a specified scratch is measured. This force is used as a relative measure of the scratch resistance of a pipe material when compared to other materials. In order to assess to what extent a scratch affects the lifetime of the pipe, the depth of the scratch must be estimated with reasonable accuracy. Since the scratch in many cases is found on existing pipelines the method must be suited for field use. To achieve that a simple instrument for scratch depth measurements was made and evaluated.

  • 10.
    Bergström, Gunnar
    et al.
    Göteborg (BMg).
    Flansbjer, Mathias
    Hållfasthet (BMh).
    Karlsson, Linda
    Hållfasthet (BMh).
    Sällberg, Sven-Erik
    Göteborg (BMg).
    Thörnblom, Kristian
    Göteborg (BMg).
    Accpetance criteria for scratches and indentations in plastic pipes2009Report (Refereed)
    Abstract [sv]

    Development of materials and laying techniques have arisen the question how scratches and indentations in plastics pipes affect the strength and technical lifetime of pipelines. Scratches may occur both in the manufacturing of the pipes, in connection with the installation and subsequent maintenance. The problems in assessing the failure risk from scratches and indentations are similar for pipes used in gas and water distribution and in district heating applications. Therefore, a broad effort to identify the risks in relation to current pipe materials is technically and economically justified. The project has aimed to evaluate the effect of scratches and indentations on the technical lifetime of plastics pipes and to present criteria for maximum allowable depth of scratches and indentations. The study on pressure pipes focused on the conditions for scratched polyethylene pipes to achieve a lifetime of 50 years. It is noted that a scratch damage can not be judged solely on the basis of its depth and sharpness. To assess the impact of the scratch on the serviceability of the pipe, consideration must also be taken to the material from which the pipe was made and the safety factor used in the design. Extensive pressure tests show that pipes made of modern materials can withstand surface scratches to a higher degree than pipes of older materials. For pipes made of modern bimodal PE80 and PE100 materials, scratches up to 10% depth may be accepted without reduction of rated pressure. However, for pipes of older material, a reduction in pressure may be required already at smaller scratches. The study also indicates that for the same relative scratch depth, a greater reduction in pressure is required with increasing pipe dimension. The study on the non pressure pipes shows that the studied polypropylene pipes resist both deep scratches combined with ovalization and large indentations without any cracks penetrating the pipe wall. However, the extent and development of crazing and surface cracking vary with scratch depth, deformation level and material. The test pipes were subjected to extreme conditions very rarely or never occurring in practice. This suggests that small scratches at moderate ovalization and realistic indentations in temperatures around room temperature do not affect the lifetime of the pipes. One objective of the project was to develop a method for the evaluation of the scratch resistance of a pipe. In the proposed test method the force needed to produce a specified scratch is measured. This force is used as a relative measure of the scratch resistance of a pipe material when compared to other materials. In order to assess to what extent a scratch affects the lifetime of the pipe, the depth of the scratch must be estimated with reasonable accuracy. Since the scratch in many cases is found on existing pipelines the method must be suited for field use. To achieve that a simple instrument for scratch depth measurements was made and evaluated.

  • 11.
    Bokesjö, Mathias
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Svensson, Thomas
    Hållfasthet (BMh).
    Al-Emrani, M
    Fatigue strength of fillet welds subjected to multi-axial stresses.2012In: International Journal of Fatigue, Vol. 44, p. 21-31Article in journal (Refereed)
  • 12.
    Borgerud, Kerstin
    Hållfasthet (BMh).
    EN 45545-2, ny standard för brandprovning av material och produkter för tåg2012In: Brandposten, no 47, p. 15-Article in journal (Other (popular science, discussion, etc.))
  • 13.
    Borgerud, Kerstin
    Hållfasthet (BMh).
    OffshoreVäst utvecklar svensk offshoreindustri2013In: Brandposten, no 49, p. 40-Article in journal (Other (popular science, discussion, etc.))
  • 14.
    Borgerud, Kerstin
    Hållfasthet (BMh).
    Provning av säkerhetshållare för ridsport2007Report (Refereed)
    Abstract [sv]

    Med säkerhetshållare menas av SvRF godkända bomhållare för hopphinder för ridsport. Resultat från här fastställd provningsmetod utgör beslutsunderlag för SvRF:s godkännande av säkerhetshållare. Provningsmetoden är framtagen enligt anvisningar från SvRF. Detta är en revision av en tidigare upplaga (1997:41).

  • 15.
    Borgerud, Kerstin
    et al.
    Hållfasthet (BMh).
    Bergstrand, Anna
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    SP har blivit medlem i SWERIG2013In: Brandposten, no 48, p. 11-Article in journal (Other (popular science, discussion, etc.))
  • 16.
    Crocetti, Roberto
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Sartoria, Tiziano
    Flansbjer, Mathias
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Timber-Concrete Composite Structures with Prefabricated FRC Slab2010In: WCTE 11th World Conference on Timber Engineering, World Conference on Timber Engineering , 2010, , p. 121-130Conference paper (Refereed)
  • 17.
    Engdahl, Ann-Sofie
    et al.
    Hållfasthet (BMh).
    Spånglund, Patrik
    Hållfasthet (BMh).
    Waller, Erica
    Hållfasthet (BMh).
    Child safety barriers2009Report (Refereed)
    Abstract [en]

    In a modern society children are exposed to many different hazards. Different types of safety barriers are often used to protect children from life-endangering accidents such as falling from great heights or falling into swimming pools. Children have a natural curiosity and climbing is a natural behaviour for them. They can and will climb objects in their environment and as they grow older their climbing ability improves. This study focuses on children’s ability to climb barriers and the barrier’s effectiveness for children of ages 4 to 6 years. The aim of the study is to obtain complementary knowledge as input to revised standards and recommendations in Europe in order to improve child safety in the built environment. An experimental study of child safety barriers has been carried out with 157 participating children in the ages 4-6 years. The relatively large sample size is necessary because there is a considerable variation in both mental and physical abilities in the age groups considered. The designs of the barriers used in the study have been chosen based on a literature survey. In this limited study it has been considered necessary to focus on a few archetype barriers, which are considered most effective, and to vary properties of these within the limits which can be accepted from economic and aesthetic points of view. Since the most able children in the age groups studied can climb such barriers, barriers must be seen as a method of increasing the time for children to enter a dangerous area rather than as providing complete safety. Hence, the time it takes for a successful climb is a relevant parameter to study. The results show that simple barriers with vertical bars or solid panels and heights 1.1 m – 1.2 m can be climbed by around half the children within 30 seconds also in the lower age groups, and that the difference in height is not very significant. The most effective barrier in this study is the one which is inclined towards the climber.

  • 18.
    Flansbjer, Mathias
    Hållfasthet (BMh).
    Brandpåverkan på samverkanspelare2004Report (Refereed)
  • 19.
    Flansbjer, Mathias
    Hållfasthet (BMh).
    Composite Action in CFT Columns under Normal Conditions and in Case of Fire2006In: Proceedings of the 2nd International fib Congress, Naples, 2006, , p. 08:05Conference paper (Other academic)
  • 20.
    Flansbjer, Mathias
    et al.
    Hållfasthet (BMh).
    Hellers, Bo Göran
    Tests on BCE2011Conference paper (Other academic)
  • 21.
    Flansbjer, Mathias
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Honfi, Daniel
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik, Strukturer och Komponenter.
    Williams Portal, Natalie
    Mueller, Urs
    Larraza, Inigo
    Edgar, Jan-Olof
    Wlasak, Lech
    Structural behaviour of RPC sandwich façade elements with GFRP connectors2015In: VII International Congress on Architectural Envelopes. San Sebastian-Donostia, Spain. 2015-05-27--29, 2015Conference paper (Other academic)
  • 22.
    Flansbjer, Mathias
    et al.
    Hållfasthet (BMh).
    Kutti, Mathias
    Löfgren, Tomas
    Samuelson, Ingemar
    Energiteknik (ET).
    Armering av plattbärlagsskarv. Sammanfattning och dimensioneringsanvisnignar.2008Report (Refereed)
  • 23.
    Flansbjer, Mathias
    et al.
    Hållfasthet (BMh).
    Lindqvist, Jan-Erik
    Brandteknik, material (BRm).
    Visual assessment of fire damaged concrete2011In: BrandPosten, no 44, p. 12-13Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    Fire can reduce the load-carrying capacity of concrete structures. A new innovative method, Optical Deformation Measurement, can be used to determine how far into the concrete damage has penetrated. The method involves measurements on test cores from the damaged structure.

  • 24.
    Flansbjer, Mathias
    et al.
    SP - Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Lindqvist, Jan-Erik
    SP - Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Johansson, Gabriel
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Löfgren, Michael
    Mechanical behaviour of concrete piles affected by sulphate attack2013In: Proceeding of the International IABSE Conference:, 2013, , p. 4Conference paper (Refereed)
  • 25.
    Flansbjer, Mathias
    et al.
    SP - Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Lindqvist, Jan-Erik
    SP - Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Silfwerbrand, Johan
    Quantitative fracture characteristics in shear load2011Conference paper (Other academic)
    Abstract [en]

    Today, no general design method for shear strength capacity of RC beams can predict the failure load with a high degree of accuracy. The failure load between two beams cast from the same batch may vary as much as 30 percent. This project aims at investigating factors affecting the shear strength capacity based on an understanding of micro and meso scale material properties. Tests were performed on beams with two different types of aggregate and two different w/c. The crack propagation was monitored during the loading by means of DIC and AE. The results show that the use of natural aggregates or crushed aggregates as finer fractions strongly affect the shear strength capacity. From direct shear tests it was found that the scatter of the shear strength was much higher for the specimens with natural aggregates compared with crushed aggregates. The same tendency was found for the shear crack initiation load for the RC beams. The percentage of fractures propagating through aggregate, paste and the ITZ varied with w/c, type of aggregate and type of failure. Microscopy in combination with DIC and AE measurements makes it possible to determine at what stage different cracks have been formed and their relation to the micro structure.

  • 26.
    Flansbjer, Mathias
    et al.
    Hållfasthet (BMh).
    Löfgren, I
    Forbes Olesen, J
    The WST-Method for Fracture Testing of Fibre-reinforced Concrete2005Report (Refereed)
  • 27.
    Flansbjer, Mathias
    et al.
    Hållfasthet (BMh).
    Magnusson, Jonas
    System design of Dome plug. Mechanical properties of rock-concrete interface2014Report (Refereed)
  • 28.
    Flansbjer, Mathias
    et al.
    SP - Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Malaga, Katarina
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Blanksvärd, Thomas
    Petersson, Örjan
    Textile reinforced concrete sandwich panels2012In: fib Symposium 2012: Concrete Structures for Sustainable Community - Proceedings, 2012, , p. 169-172Conference paper (Refereed)
  • 29.
    Flansbjer, Mathias
    et al.
    Hållfasthet (BMh).
    Malaga, Katarina
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Tammo, Kristian
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Blanksvärd, Thomas
    Alternative anchorage systems for textile reinforced concrete elements.2013In: First International Conference on Concrete Sustainability. Tokyo. 2013-05-27--29, JCI , 2013Conference paper (Other academic)
  • 30.
    Flansbjer, Mathias
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Malaga, Katarina
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Williams Portal, Natalie
    Dias Ferreira Da Silva, Nelson
    Mueller, Urs
    Larraza, Inigo
    Chozas, Valle
    Vera, Jose
    Reactive powder concrete for facade elements – A sustainable approach2015In: VII International Congress on Architectural Envelopes. San Sebastian-Donostia, Spain. 2015-05-27--29, 2015Conference paper (Other academic)
  • 31.
    Flansbjer, Mathias
    et al.
    SP - Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Silfwerbrand, Johan
    Lindqvist, Jan-Erik
    SP - Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Zandi Hanjari, Kamyab
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Structural analysis of concrete members with shear failure2012In: fib Symposium 2012: Concrete Structures for Sustainable Community - Proceedings, 2012, , p. 165-168Conference paper (Refereed)
  • 32.
    Flansbjer, Mathias
    et al.
    Hållfasthet (BMh).
    Sjögren, Torsten
    Hållfasthet (BMh).
    Using digital image correlation techniques and finite element models for strain-field analysis of a welded aluminium struc2011In: Applied Mechanics and Materials, ISSN 1660-9336, E-ISSN 1662-7482, Vol. 70, p. 123-128Article in journal (Refereed)
  • 33.
    Flansbjer, Mathias
    et al.
    Hållfasthet (BMh).
    Sjögren, Torsten
    Hållfasthet (BMh).
    Using digital image correlation techniques and finite element models for strain-field analysis of a welded aluminium structure2011Conference paper (Refereed)
  • 34. Glamheden, Rune
    et al.
    Fälth, Billy
    Jacobsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Harrström, Johan
    Berglund, Johan
    Bergkvist, Lars
    Counterforce applied to prevent spalling2010Report (Refereed)
  • 35. Hessling, Jan Peter
    et al.
    Svensson, Thomas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Propagation of uncertainty by sampling on confidence boundaries2013In: International Journal for Uncertainty Quantification, Vol. 3, p. 421-444Article in journal (Refereed)
  • 36.
    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)
  • 37.
    Hoseini, Mohammed
    Hållfasthet (BMh).
    Effect of Vitamine E concentration and Artificial Aging on y-irradiated UHMWEP.2003In: BiomaterialsArticle in journal (Other academic)
  • 38.
    Hoseini, Mohammed
    Hållfasthet (BMh).
    Tribological Investigation of Coatings for Artificial Joints2005In: WEAR, no 5Article in journal (Refereed)
  • 39.
    Hoseini, Mohammed
    Hållfasthet (BMh).
    Tribological Investigation of Coatings for Artificial Joints2008In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 264, no 11-12, p. 958–966-Article in journal (Refereed)
  • 40.
    Hoseini, Mohammed
    et al.
    Hållfasthet (BMh).
    Lausmaa, Jukka
    Funktionella material (KMf).
    A new screening method for the tribological investigation of artificial joints2001In: Tribology in biomechanical systems. Proceedings of 2nd World Tribology Congress, Vienna, September 3-7, 2001, 2001Conference paper (Other academic)
  • 41.
    Hoseini, Mohammed
    et al.
    Hållfasthet (BMh).
    Lausmaa, Jukka
    Funktionella material (KMf).
    Tribological investigation of oriented HDPE2002In: Journal of Biomedical Materials Research, Vol. 61, no 4, p. 6-Article in journal (Other academic)
  • 42.
    Hoseini, Mohammed
    et al.
    Hållfasthet (BMh).
    Lausmaa, Jukka
    Funktionella material (KMf).
    Boldizar, Antal
    Tribological investigation of oriented HDPE1999In: Proc. Polymer Processing Society, Asia/Australia Regional Meeting, Bangkok, Dec. 1999., 1999, , p. 109-111Conference paper (Other academic)
  • 43. Härkegård, Gunnar
    et al.
    Svensson, Thomas
    Hållfasthet (BMh).
    Zambrano, H.R.
    Round-robin prediction of the fatigue limit of a ring of spheroidal graphite cast iron2013In: Fatigue and Fracture of Engineering Materials Structures, Vol. 36, no 5, p. 382-91Article in journal (Refereed)
    Abstract [en]

    A round-robin investigation has been performed, where stress analysts from eight different organisations carried out a total of 11 predictions of the expected fatigue limit of a diametrically loaded cast ring subjected to fluctuating tensile or compressive loading. Whereas geometry, load parameters, and type and quality of material (spheroidal graphite cast iron EN-GJS-600-3) had been prescribed, the participants were free to use computational tools and models, and fatigue assessment models and data of their own choice. The objectives of the investigation were to compare the 11 predictions (i) among themselves, and (ii) with a posteriori experimental fatigue limits determined by means of stair-case testing. The fatigue limit predictions showed coefficients of variation of as large as 25%. Even for a group of analysts from a single organisation, the coefficients variation were around 15%. Fatigue tests gave mean fatigue limits 60% (tensile loading) and 30% (compressive loading) above the a priori predictions. Possible reasons for the large deviations between single predictions and for their conservatism have been proposed. It seems that design engineers (i) make use of the available room for interpretation of models and data, and (ii) have an unconscious tendency to make conservative assumptions. Only if models and data for fatigue assessment are prescribed in great detail, can the ‘scatter’ among fatigue limit predictions be expected to decrease below 15–25%. Improved ‘absolute’ predictions would require more accurate fatigue data.

  • 44. 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)
  • 45. 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)
  • 46. 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)
  • 47.
    Jacobson, Jan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik, Pålitliga system.
    Kjell, Gunnar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Lau, Peter
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Volym, flöde, temperatur o densitet.
    Tunare, Jens
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik, Produktsäkerhet.
    Åkesson, Eddie
    ?.
    Programvarukvalitet i mät- och provutrustning.1993Report (Refereed)
  • 48.
    Jacobsson, Lars
    Hållfasthet (BMh).
    A plasticity model for ballast resistance2005Report (Refereed)
  • 49.
    Jacobsson, Lars
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Andersson, Hans
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Undersökning av täthet hos flänsförband i grova plaströr med beräkningar och expermiment2011Report (Refereed)
  • 50.
    Jacobsson, Lars
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Andersson, Hans
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Sällberg, Sven-Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Göteborg (BMg).
    Tightness of flange joints for large polyethylene pipes – Part 2 Full scale experimental investigations2011Report (Refereed)
    Abstract [en]

    Tightness of flange joints for large polyethylene pipes – Part 2 Full scale experimental investigations Leakage that sometimes occurs in flange joints in large size plastic pipelines for water supply is a serious problem. Research was undertaken in order to improve the knowledge about the function of such flange joints. The objectives were partly to find out the degree of sensitivity of the design, i e if small deviations from recommended practise is critical, partly to be able to suggest improved design and mounting procedures. One part of the investigation was a numerical (FEM) study of several geometries, which was reported in [2]. Use of a time-dependent material model made it possible to follow the development of deformations and flange surface pressures for long times. Although several important principal findings were made, the tightening procedure and exact material behaviour could not be modelled. Therefore a series of full-scale experiments were made on 630 mm pipes, for a number of combinations of flange dimension and gasket type. This second part of the research is reported here. Since four of the twenty bolts were instrumented, the bolt forces could be monitored and be related to the torque and to the pressure in the pipe over time. This resulted in novel, important information about the functioning of plastic flange joints. In short, the experiments were performed in the following way. First, the bolts were tightened in the recommended criss-cross fashion to pre-determined torque levels. Then the pressure in the pipe was increased until leakage occurred. For combinations of flanges, gaskets and torques where the joint was tight for pressures above 13 bars, the 13 bar pressure level was maintained for up to one week. The relationship between bolt force and torque does not agree at all with the frequently used rule of thumb formula, for the galvanized bolts used here. The bolt force was typically less than half the value obtained by the formula. Hence it is critical to verify the friction for the used combination of bolt material, surface treatment, and lubrication. The bolt forces also appear to be unevenly distributed, which is partly due to successive creep during the tightening procedure. For the high stresses in the flange creep is significant already for so short times as a few minutes, and the effect is increased by the fact that the bolts and backing rings are much stiffer than the plastic flange. For both the wide and the narrow (ISO) flange type used it appears that rubber gaskets perform better, in the sense that the joint is tight for lower applied torques. The hyper- elastic material properties help to smooth unevenness in the flange surface and to compensate for creep in the plastic. Use of SDR 17 pipes at pressure levels of 13 bars means considerable creep expansion of the pipe, although it is possible to obtain a tight joint. The expansion gives a wringing effect at the flange, also observed in [2], which contributes to concentrate the flange pressure to the outer parts of the flange surface. In summary, flange joints are possible to mount so that they are tight, also for 630 mm pipes. Since the design is a sensitive one it is vital to follow recommendations for 4 mounting of different combinations of flanges and gaskets. In particular, knowledge about the relationship between torque and bolt force is important.

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