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Marklund, Erik
Publications (10 of 25) Show all publications
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.). Paper presented at . 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.

National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-9037 (URN)10.1177/0731684414526290 (DOI)000340937000006 ()2-s2.0-84901264073 (Scopus ID)7996d628-cbf2-4b2b-adc6-4a92cd8b4987 (Local ID)7996d628-cbf2-4b2b-adc6-4a92cd8b4987 (Archive number)7996d628-cbf2-4b2b-adc6-4a92cd8b4987 (OAI)
Note
Validerad; 2014; 20140310 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically 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.). Paper presented at . 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.

National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-11708 (URN)10.1016/j.compositesb.2014.04.023 (DOI)000338407800024 ()2-s2.0-84901250858 (Scopus ID)ab7b3341-7a90-4ee0-bc86-d8ff6dca2403 (Local ID)ab7b3341-7a90-4ee0-bc86-d8ff6dca2403 (Archive number)ab7b3341-7a90-4ee0-bc86-d8ff6dca2403 (OAI)
Note
Validerad; 2014; 20140506 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Bachinger, A., Marklund, E., Rössler, J., Hellström, P. & Asp, L. (2014). Stiffness-modifiable composite for pedestrian protection (ed.). In: (Ed.), 16th European Conference on Composite Materials, ECCM 2014: Seville, Spain, 22 - 26 June 2014. Paper presented at European Conference on Composite Materials : 22/06/2014 - 26/06/2014. 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)In: 16th European Conference on Composite Materials, ECCM 2014: Seville, Spain, 22 - 26 June 2014, European Conference on Composite Materials, ECCM , 2014Conference 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
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-37523 (URN)2-s2.0-84915756456 (Scopus ID)b96281b7-3ae6-4f50-8707-5f601f35e790 (Local ID)9780000000002 (ISBN)b96281b7-3ae6-4f50-8707-5f601f35e790 (Archive number)b96281b7-3ae6-4f50-8707-5f601f35e790 (OAI)
Conference
European Conference on Composite Materials : 22/06/2014 - 26/06/2014
Note

Godkänd; 2014; 20141217 (andbra)

Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2019-08-20Bibliographically approved
Marklund, E., Asp, L. & Olsson, R. (2014). Transverse strength of unidirectional non-crimp: multiscale Modelling (ed.). Paper presented at . Composites Part B: Engineering, 65, 47-56
Open this publication in new window or tab >>Transverse strength of unidirectional non-crimp: 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 analyzed is demonstrated by FEM stress analysis and by experimental data showing differences in transverse cracking pattern due to bundle waviness.

National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-15962 (URN)10.1016/j.compositesb.2014.01.053 (DOI)000342870500008 ()2-s2.0-84906946467 (Scopus ID)f8c56d7f-490b-4bab-8539-c4985a4f09e0 (Local ID)f8c56d7f-490b-4bab-8539-c4985a4f09e0 (Archive number)f8c56d7f-490b-4bab-8539-c4985a4f09e0 (OAI)
Note
Validerad; 2014; 20140205 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Asp, L., Marklund, E., Varna, J. & Olsson, R. (2012). Multiscale modelling of non-crimp fabric composites (ed.). In: (Ed.), (Ed.), Proceedings of the ASME International Mechanical Engineering Congress and Exposition--2012: presented at ASME 2012 International Mechanical Engineering Congress and Exposition, November 9-15, 2012 Houston, Texas USA. Paper presented at ASME 2012 International Mechanical Engineering Congress & Exposition : 09/11/2012 - 15/11/2012 (pp. 581-590). New York: American Society of Mechanical Engineers, 3
Open this publication in new window or tab >>Multiscale modelling of non-crimp fabric composites
2012 (English)In: Proceedings of the ASME International Mechanical Engineering Congress and Exposition--2012: presented at ASME 2012 International Mechanical Engineering Congress and Exposition, November 9-15, 2012 Houston, Texas USA, New York: American Society of Mechanical Engineers , 2012, Vol. 3, p. 581-590Conference 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

Place, publisher, year, edition, pages
New York: American Society of Mechanical Engineers, 2012
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-38571 (URN)10.1115/IMECE2012-89236 (DOI)2-s2.0-84887286420 (Scopus ID)d01f2e2c-f001-4051-b173-a4bebb599d30 (Local ID)9780791845196 (ISBN)d01f2e2c-f001-4051-b173-a4bebb599d30 (Archive number)d01f2e2c-f001-4051-b173-a4bebb599d30 (OAI)
Conference
ASME 2012 International Mechanical Engineering Congress & Exposition : 09/11/2012 - 15/11/2012
Note
Godkänd; 2012; 20131125 (andbra)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-07-10Bibliographically approved
Olsson, R., Marklund, E. & Jansson, N. (2012). Testing of carbon/epoxy NCF strength under mixed in-plane loading (ed.). In: (Ed.), Marino Quaresimin; Laszlo Kollar; Leif Asp (Ed.), Proceedings of the 15th European Conference on Composite Materials: . Paper presented at European Conference on Composite Materials : 24/06/2012 - 28/06/2012. Venice
Open this publication in new window or tab >>Testing of carbon/epoxy NCF strength under mixed in-plane loading
2012 (English)In: Proceedings of the 15th European Conference on Composite Materials / [ed] Marino Quaresimin; Laszlo Kollar; Leif Asp, Venice, 2012Conference 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
Venice: , 2012
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-28355 (URN)2215de30-c780-4800-9bc0-7b397dd66a71 (Local ID)9788888785332 (ISBN)2215de30-c780-4800-9bc0-7b397dd66a71 (Archive number)2215de30-c780-4800-9bc0-7b397dd66a71 (OAI)
Conference
European Conference on Composite Materials : 24/06/2012 - 28/06/2012
Note
Godkänd; 2012; 20140819 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Marklund, E., Varna, J. & Asp, L. (2011). Damage progression in non-crimp fabric composites (ed.). In: (Ed.), Stepan Lomov (Ed.), Non-crimp fabrics composites: manufacturing, properties and applications. Paper presented at . Cambridge: Woodhead Publishing Materials
Open this publication in new window or tab >>Damage progression in non-crimp fabric composites
2011 (English)In: Non-crimp fabrics composites: manufacturing, properties and applications, Cambridge: Woodhead Publishing Materials , 2011Chapter in book (Refereed)
Place, publisher, year, edition, pages
Cambridge: Woodhead Publishing Materials, 2011
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-20927 (URN)94779e3a-b02c-4401-a445-a8bfe5557a04 (Local ID)1-84569-762-6 (ISBN)94779e3a-b02c-4401-a445-a8bfe5557a04 (Archive number)94779e3a-b02c-4401-a445-a8bfe5557a04 (OAI)
Note
Godkänd; 2011; 20110713 (leiasp)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-06-14Bibliographically approved
Marklund, E., Nilsson, S. & Asp, L. (2011). Matrix failure prediction in polymer composites including effects of temperature and degree of cure (ed.). In: (Ed.), R. Rolfes; E.L. Jansen (Ed.), Composites 2011: ECCOMAS Thematic Conference, 3rd International Conference on the Mechanical Response of Composites, Hannover, 21 - 23 September, 2011. Paper presented at ECCOMAS Thematic Conference on the Mechanical Response of Composite Materials : 21/09/2011 - 23/09/2011 (pp. 579-586). Hannover: LUH, Institut für Statik und Dynamik
Open this publication in new window or tab >>Matrix failure prediction in polymer composites including effects of temperature and degree of cure
2011 (English)In: Composites 2011: ECCOMAS Thematic Conference, 3rd International Conference on the Mechanical Response of Composites, Hannover, 21 - 23 September, 2011 / [ed] R. Rolfes; E.L. Jansen, Hannover: LUH, Institut für Statik und Dynamik , 2011, p. 579-586Conference paper, Published paper (Other academic)
Place, publisher, year, edition, pages
Hannover: LUH, Institut für Statik und Dynamik, 2011
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-40188 (URN)f37da2f8-dc33-4f87-a213-3138e317f6af (Local ID)978-3-00-035855-5 (ISBN)f37da2f8-dc33-4f87-a213-3138e317f6af (Archive number)f37da2f8-dc33-4f87-a213-3138e317f6af (OAI)
Conference
ECCOMAS Thematic Conference on the Mechanical Response of Composite Materials : 21/09/2011 - 23/09/2011
Note

Godkänd; 2011; 20111109 (andbra)

Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-06-14Bibliographically approved
Asp, L., Marklund, E. & Varna, J. (2011). Modelling stiffness and strength of non-crimp fabric composites: semi-laminar analysis (ed.). In: (Ed.), (Ed.), Non-crimp fabrics composites: manufacturing, properties and applications (pp. 402-438). Paper presented at . Cambridge: Woodhead Publishing Materials
Open this publication in new window or tab >>Modelling stiffness and strength of non-crimp fabric composites: semi-laminar analysis
2011 (English)In: Non-crimp fabrics composites: manufacturing, properties and applications, Cambridge: Woodhead Publishing Materials , 2011, p. 402-438Chapter in book (Refereed)
Place, publisher, year, edition, pages
Cambridge: Woodhead Publishing Materials, 2011
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-21016 (URN)10.1016/B978-1-84569-762-4.50017-5 (DOI)2-s2.0-84902622096 (Scopus ID)a6e356a5-1ee2-48ab-a425-e7ab99acb82e (Local ID)1-84569-762-6 (ISBN)a6e356a5-1ee2-48ab-a425-e7ab99acb82e (Archive number)a6e356a5-1ee2-48ab-a425-e7ab99acb82e (OAI)
Note
Godkänd; 2011; 20110713 (leiasp)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Marklund, E., Varna, J. & Asp, L. (2011). Stiffness and strength modelling of non-crimp fabric composites (ed.). In: (Ed.), 52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference 2011: . Paper presented at AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference : 04/04/2011 - 07/04/2011 (pp. 679-695). Red Hook: Curran Associates, Inc., 1
Open this publication in new window or tab >>Stiffness and strength modelling of non-crimp fabric composites
2011 (English)In: 52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference 2011, Red Hook: Curran Associates, Inc., 2011, Vol. 1, p. 679-695Conference paper, Published paper (Refereed)
Abstract [en]

This work comprises methodologies for micro-meso stiffness modelling and limited analysis for strength prediction. It is intended to formulate some guidelines and recommendations when modelling NCF composites mechanical performance. For both micro- and meso stiffness modelling, analytical models are compared to FE investigations considering idealised structures. Important aspects when modelling matrix failure of NCF composite bundles are presented to highlight some of the challenges in future modelling. Possible failure criteria for modelling matrix failure within fibre bundles have been investigated; their strength, problems and weaknesses are revealed.

Place, publisher, year, edition, pages
Red Hook: Curran Associates, Inc., 2011
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-30302 (URN)10.2514/6.2011-1748 (DOI)84872457600 (Scopus ID)410ad0f4-82e8-4b92-aa7d-74daf2936253 (Local ID)978-1-61839-042-4 (ISBN)410ad0f4-82e8-4b92-aa7d-74daf2936253 (Archive number)410ad0f4-82e8-4b92-aa7d-74daf2936253 (OAI)
Conference
AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference : 04/04/2011 - 07/04/2011
Note

Godkänd; 2011; Bibliografisk uppgift: Article number AIAA 2011-1748; 20111219 (ysko)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-06-14Bibliographically approved
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