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Characterization and modelling of multiple intralaminar cracking initiation under tensile quasi-static and fatigue loading
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-3322-8197
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0001-9649-8621
2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The first failure mode in tensile quasi-static and in tension-tension fatigue (cyclic) loading of composite laminates is intralaminar cracking in layers with off-axis fiber orientation. These tunnel-building cracks are result of combined action of in-plane transverse and shear stresses. We assume that due to non-uniform fiber distribution (clustering) which leads to local stress concentrations, different positions in the layer have different resistance to crack initiation (initiation strength). If so, the weakest position in quasi-static loading is also the weakest in fatigue and some of the distribution parameters for fatigue behavior can be obtained in quasi-static tests, thus significantly reducing the number of required fatigue tests. Methodology is suggested and validated for cases when the cracking is initiation governed- initiated crack almost instantly propagates along fibers. Distribution parameters are identified using data in low crack density region where stress perturbations from cracks do not interact. Monte- Carlo simulations are performed for cracking in layers under quasi-static and cyclic loading using novel approach for computationally efficient stress state calculation between existing cracks. 

Place, publisher, year, edition, pages
Trans Tech Publications, 2018. Vol. 774, p. 467-472
Series
Key Engineering Materials, ISSN 1013-9826, E-ISSN 1662-9795 ; 774
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-70942DOI: 10.4028/www.scientific.net/KEM.774.467ISBN: 9783035713503 (print)OAI: oai:DiVA.org:ltu-70942DiVA, id: diva2:1250564
Conference
17th International Conference on Fracture and Damage Mechanics, FDM 2018; Bangkok; Thailand; 4-6 September 2018; Code 217369
Available from: 2018-09-24 Created: 2018-09-24 Last updated: 2018-09-24Bibliographically approved

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Kahla, Hiba BenVarna, Janis

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CiteExportLink to record
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