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Publications (10 of 19) Show all publications
Carlstedt, D., Marklund, E. & Asp, L. (2019). Effects of state of charge on elastic properties of 3D structural battery composites. Composites Science And Technology, 169, 26-33
Open this publication in new window or tab >>Effects of state of charge on elastic properties of 3D structural battery composites
2019 (English)In: Composites Science And Technology, ISSN 0266-3538, E-ISSN 1879-1050, Vol. 169, p. 26-33Article in journal (Refereed) Published
Abstract [en]

The effects of state of charge (SOC) on the elastic properties of 3D structural battery composites are studied. An analytical model based on micromechanical models is developed to estimate the effective elastic properties of 3D structural battery composite laminae at different SOC. A parametric study is performed to evaluate how different design parameters such as volume fraction of active materials, stiffness of constituents, type of positive electrode material, etc. affect the moduli of the composite lamina for extremes in SOC. Critical parameters and configurations resulting in large variations in elastic properties due to change in SOC are identified. As the extreme cases are of primary interest in structural design, the effective elastic properties are only estimated for the electrochemical states corresponding to discharged (SOC = 0) and fully charged (SOC = 1) battery. The change in SOC is simulated by varying the volume and elastic properties of the constituents based on data from literature. Parametric finite element (FE) models for square and hexagonal fibre packing arrangements are also analysed in the commercial FE software COMSOL and used to validate the analytical model. The present study shows that the transverse elastic properties E2 and G23 and the in-plane shear modulus G12 are strongly affected by the SOC while the longitudinal stiffness E1 is not. Fibre volume fraction and the properties of the coating (such as stiffness and Poisson's ratio) are identified as critical parameters that have significant impact on the effect of SOC on the effective elastic properties of the composite lamina. For configurations with fibre volume fraction Vf ≥ 0.4 and Young's modulus of the coating of 1 GPa or higher, the transverse properties E2 and G23 change more than 30% between extremes in SOC. Furthermore, for configurations with high volume fractions of electrode materials and coating properties approaching those of rubber the predicted change in transverse stiffness E2 is as high as +43%. This shows that it is crucial to take effects of SOC on the elastic properties into account when designing 3D structural battery composite components. © 2018 Elsevier Ltd

Keywords
Carbon fibres, Functional composites, Electrical properties, Elastic properties, C. Modelling, Analytical models, Battery management systems, Charging (batteries), Coatings, Composite structures, Elastic moduli, Elasticity, Electrodes, Fibers, Stiffness, Structural design, Structural properties, Volume fraction, Effective elastic property, Elastic properties, Fibre volume fraction, Functional composites, In-plane shear modulus, Longitudinal stiffness, Parametric finite elements, Positive electrode materials, Secondary batteries
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-36398 (URN)10.1016/j.compscitech.2018.10.033 (DOI)2-s2.0-85056185119 (Scopus ID)
Note

 Funding details: Horizon 2020, 738085; Funding details: European Geosciences Union, EGU; Funding details: U.S. Air Force, USAF, FA9550-17-1-0338;

Available from: 2018-11-22 Created: 2018-11-22 Last updated: 2019-06-27Bibliographically approved
Kopp, A., Stappert, S., Mattsson, D., Olofsson, K., Marklund, E., Kurth, G., . . . Roorda, E. (2018). The Aurora space launcher concept. CEAS Space Journal, 10(2), 167-187
Open this publication in new window or tab >>The Aurora space launcher concept
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2018 (English)In: CEAS Space Journal, ISSN 1868-2502, E-ISSN 1868-2510, Vol. 10, no 2, p. 167-187Article in journal (Refereed) Published
Abstract [en]

This paper gives an overview about the Aurora reusable space launcher concept study that was initiated in late-2015/early-2016. Within the Aurora study, several spaceplane-like vehicle configurations with different geometries, propulsion systems and mission profiles will be designed, investigated and evaluated with respect to their technical and economic feasibility. The first part of this paper will discuss the study logic and the current status of the Aurora studies and introduces the first vehicle configurations and their system design status. As the identification of highly efficient structural designs is of particular interest for Aurora, the structural design and analysis approach will be discussed in higher level of detail. A special design feature of the Aurora vehicle configurations is the utilization of the novel thin-ply composite material technology for structural mass reductions. Therefore, the second part of this paper will briefly discuss this technology and investigate the application and potential mass savings on vehicle level within simplified structural analysis studies. The results indicate that significant mass savings could be possible. Finally, an outlook on the next steps is provided.

Keywords
Hypersonics, Launcher, Reusable, Spaceplane, Thin-ply composites, Aerospace vehicles, Computer software reusability, Hypersonic aerodynamics, Launching, Structural design, Design and analysis, Economic feasibilities, Material technologies, Ply composites, Space plane, Vehicle configuration, Hypersonic vehicles
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-33973 (URN)10.1007/s12567-017-0184-2 (DOI)2-s2.0-85047252271 (Scopus ID)
Available from: 2018-07-03 Created: 2018-07-03 Last updated: 2019-06-27Bibliographically approved
Zrida, H., Marklund, E., Ayadi, Z. & Varna, J. (2014). Effective stiffness of curved 0°-layers for stiffness determination of cross-ply non-crimp fabric composites (ed.). Journal of reinforced plastics and composites (Print), 33(14), 1339-1352
Open this publication in new window or tab >>Effective stiffness of curved 0°-layers for stiffness determination of cross-ply non-crimp fabric composites
2014 (English)In: Journal of reinforced plastics and composites (Print), ISSN 0731-6844, E-ISSN 1530-7964, Vol. 33, no 14, p. 1339-1352Article in journal (Refereed) Published
Abstract [en]

The effect of the 0°-tow waviness on axial stiffness of cross-ply non-crimp fabric composites is analysed using multiscale approach. The curved 0°- and 90°-layers are represented by flat layers with effective stiffness properties and classical laminate theory is used to calculate the macroscopic stiffness. The effective 0°-layer stiffness is calculated analysing isolated curved 0°-layers subjected not only to end loading, but also to surface loads. The surface loads are identified in a detailed finite element analysis and approximated by a sinus shaped function with amplitude depending on the waves parameters. The sinus shaped surface loads are then applied to an isolated curved 0°-layer finite element model together with end loading to calculate the effective stiffness of the layer. Finally, the effective 0°-layer stiffness was successfully used to calculate the macroscopic stiffness of the composite proving validity of the approach being used and showing that, without losing accuracy, elastic properties in the 90°-layers with bundle structure can be replaced by the transverse stiffness of the homogenised 90°-layer material. © 2014 The Author(s).

Place, publisher, year, edition, pages
SAGE Publications Ltd, 2014
Keywords
Boundary conditions, Classical laminate theory, Effective stiffness, Non-crimp fabric, Waviness
National Category
Materials Engineering
Identifiers
urn:nbn:se:ri:diva-13155 (URN)10.1177/0731684414526290 (DOI)
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2019-06-27Bibliographically approved
Zrida, H., Marklund, E., Ayadi, Z. & Varna, J. (2014). Master curve approach to axial stiffness calculation for non-crimp fabric biaxial composites with out-of-plane waviness (ed.). Composites Part B: Engineering, 64, 214-221
Open this publication in new window or tab >>Master curve approach to axial stiffness calculation for non-crimp fabric biaxial composites with out-of-plane waviness
2014 (English)In: Composites Part B: Engineering, ISSN 1359-8368, E-ISSN 1879-1069, Vol. 64, p. 214-221Article in journal (Refereed) Published
Abstract [en]

The effect of 0°-tow out-of-plane waviness on the biaxial non-crimp-fabric (NCF) composite axial stiffness is investigated. Homogenizing, the bundle mesostructure of the NCF composite is replaced by layers. Then the composite is represented by a laminate with flat layers with effective stiffness properties representing the curved 0°-layer and the 90°-layer with varying thickness. It is shown that the NCF composite knock-down factor characterizing the stiffness degradation has almost the same dependence on wave parameters as the knock-down factor for the curved 0°-layer. Numerical analysis showed that 90°-layer knock-down factor versus amplitude curves for different wavelength can be reduced to one master curve which can be described by a one-parameter expression with the parameter dependent on the used material. This observation is used to obtain high accuracy for analytical predictions for knock-down factors for cases with different wavelength and amplitudes based on two FE calculations only. © 2014 Elsevier Inc. All rights reserved.

Place, publisher, year, edition, pages
Elsevier Ltd, 2014
Keywords
A. Polymer-matrix composites (PMCs), A. Tow, B. Mechanical properties, C. Finite element analysis (FEA), C. Laminate mechanics
National Category
Materials Engineering
Identifiers
urn:nbn:se:ri:diva-13146 (URN)10.1016/j.compositesb.2014.04.023 (DOI)
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2019-06-27Bibliographically approved
Bachinger, A., Marklund, E., Rössler, J., Hellström, P. & Asp, L. (2014). Stiffness-modifiable composite for pedestrian protection (ed.). In: : . Paper presented at 16th European Conference on Composite Materials, ECCM 2014. European Conference on Composite Materials, ECCM
Open this publication in new window or tab >>Stiffness-modifiable composite for pedestrian protection
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2014 (English)Conference paper, Published paper (Refereed)
Abstract [en]

A novel functional material allowing stiffness-reduction upon external stimulation was developed. Implementation of such technology in the design of a car front has high potential to result in increased protection of vulnerable road users (VRUs). The composite material is obtained by coating carbon fibres with a thermoplastic polymer in a continuous process, followed by infusion with an epoxy resin. The process is scalable for industrial use. The coating process was optimized regarding coating efficiency, energy consumption, risks involved for operating personnel and environment, and tailored to gain the optimal coating thickness obtained from numerical calculations. A drastic decrease in transversal stiffness could be detected for the composite material by dynamic mechanical thermal analysis (DMTA), when the temperature was increased above the glass transition temperature of the thermoplastic interphase. The ability of the material to achieve such temperature and associated reduction in stiffness by the application of current was verified using a special 3-point bending setup developed for this task.

Place, publisher, year, edition, pages
European Conference on Composite Materials, ECCM, 2014
Keywords
Fibre/matrix interface, Pedestrian protection, Stiffness-variable composite
National Category
Materials Engineering
Identifiers
urn:nbn:se:ri:diva-13076 (URN)2-s2.0-84915756456 (Scopus ID)9780000000002 (ISBN)
Conference
16th European Conference on Composite Materials, ECCM 2014
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2019-08-12Bibliographically approved
Marklund, E., Asp, L. & Olsson, R. (2014). Transverse strength of unidirectional non-crimp fabric composites: Multiscale modelling (ed.). Composites Part B: Engineering, 65, 47-56
Open this publication in new window or tab >>Transverse strength of unidirectional non-crimp fabric composites: Multiscale modelling
2014 (English)In: Composites Part B: Engineering, ISSN 1359-8368, E-ISSN 1879-1069, Vol. 65, p. 47-56Article in journal (Refereed) Published
Abstract [en]

A multiscale approach is used to predict transverse tensile and transverse compressive strength of unidirectional non-crimp fabric (NCF) composites. Numerical analysis on fibre/matrix scale is performed to obtain the transverse strength of the fibre bundle to be further used in an analytical mesoscale model to predict the strength of the unidirectional NCF composite. Design of unidirectional layer composites with the same fibres, interface, matrix and volume fractions as in the bundle is suggested as an alternative method for bundle strength determination. Good agreement of both methods for bundle transverse strength determination is demonstrated. The simple analytical model used on mesoscale gives accurate predictions of the tensile transverse strength whereas the compressive strength is underestimated. The necessity of including bundle waviness in models when bidirectional NCF composites are analysed is demonstrated by FEM stress analysis and by experimental data showing differences in transverse cracking pattern due to bundle waviness. © 2014 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
Elsevier Ltd, 2014
Keywords
A. Fabrics/textiles, A. Polymer-matrix composites (PMCs), C. Analysis, D. Mechanical testing
National Category
Materials Engineering
Identifiers
urn:nbn:se:ri:diva-13150 (URN)10.1016/j.compositesb.2014.01.053 (DOI)
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2019-06-28Bibliographically approved
Marklund, E., Hellström, P. & Wingborg, J. (2013). Evaluation of CFRP-Hybrix integrated joints (ed.). Paper presented at . Swerea SICOMP
Open this publication in new window or tab >>Evaluation of CFRP-Hybrix integrated joints
2013 (English)Report (Refereed)
Place, publisher, year, edition, pages
Swerea SICOMP, 2013
Series
Swerea SICOMP Technical Reports ; TN13003
National Category
Materials Engineering
Identifiers
urn:nbn:se:ri:diva-13238 (URN)
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2019-06-27Bibliographically approved
Asp, L., Marklund, E., Varna, J. & Olsson, R. (2012). Multiscale modelling of non-crimp fabric composites (ed.). In: : . Paper presented at ASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012. , 3(PARTS A, B, AND C)
Open this publication in new window or tab >>Multiscale modelling of non-crimp fabric composites
2012 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Damage initiation and evolution in NCF composites leading to final failure includes a multitude of mechanisms and phenomena on several length scales. From an engineering point-of-view a computational scheme where all mechanisms would be explicitly addressed is too complex and time consuming. Hence, methods for macroscopic performance prediction of NCF composites, with limited input regarding micro- And mesoscale details, are requested. In this paper, multi-scale modelling approaches for in-plane transverse strength of NCF composites are outlined and discussed. In addition a simplistic method to predict transverse tensile and compressive strength for textile composites featuring low or no fibre waviness is presented. Copyright © 2012 by ASME.

Publisher
p. 581-590
National Category
Materials Engineering
Identifiers
urn:nbn:se:ri:diva-13087 (URN)10.1115/IMECE2012-89236 (DOI)2-s2.0-84887286420 (Scopus ID)9780791845196 (ISBN)
Conference
ASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2019-06-28Bibliographically approved
Marklund, E. (2012). Smältfogning av termoplastbaserade kompositer och lättmetall (ed.). Paper presented at . Swerea SICOMP
Open this publication in new window or tab >>Smältfogning av termoplastbaserade kompositer och lättmetall
2012 (Swedish)Report (Refereed)
Place, publisher, year, edition, pages
Swerea SICOMP, 2012
Series
Swerea SICOMP Technical Reports ; TN12001
National Category
Materials Engineering
Identifiers
urn:nbn:se:ri:diva-13240 (URN)
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2019-06-27Bibliographically approved
Olsson, R., Marklund, E. & Jansson, N. (2012). Testing of carbon/epoxy NCF strength under mixed in-plane loading (ed.). In: : . Paper presented at 15th European Conference on Composite Materials: Composites at Venice, ECCM 2012. European Conference on Composite Materials, ECCM
Open this publication in new window or tab >>Testing of carbon/epoxy NCF strength under mixed in-plane loading
2012 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The measured stiffness and strength of a carbon/epoxy unidirectional NCF system in shear, tension and compression are compared with test results for the pure resin and for impregnated bundle material under various combinations of in-plane compressive and tensile loading. The study is a part of a project to develop mesomechanics models to predict failure of NCF materials under triaxial loading by use of data for the pure resin and for bundles impregnated by resin. A simplified analytical rule-of-mixtures model is suggested for stiffness and strength of the NCF material. Good agreement is shown for shear and tension along and transverse to the bundles. Compressive strengths are significantly underestimated, apparently due to deficiencies in the compressive test method used for the bundle material.

Place, publisher, year, edition, pages
European Conference on Composite Materials, ECCM, 2012
Keywords
Failure criteria, Multiaxial loading, Non-crimp fabrics
National Category
Materials Engineering
Identifiers
urn:nbn:se:ri:diva-13101 (URN)2-s2.0-84903975740 (Scopus ID)9788888785332 (ISBN)
Conference
15th European Conference on Composite Materials: Composites at Venice, ECCM 2012
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2019-08-01Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-3755-6419

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