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Response of cross-ply composite to off-axis loading
Institute of Polymer Mechanics, University of Latvia.
Institute of Polymer Mechanics, University of Latvia.
Institute of Polymer Mechanics, University of Latvia.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0001-9649-8621
2002 (English)In: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 36, no 18, p. 2125-2134Article in journal (Refereed) Published
Abstract [en]

Polymer composites are known to exhibit nonlinear stress-strain response due to nonlinearly elastic or plastic deformation of the matrix and damage accumulation. Mechanistic modeling of material response explicitly accounting for these interacting factors often leads to complex theories. Plasticity theory formalism provides an alternative for nonlinear deformation description of composite material. We examine the applicability of an orthotropic plasticity model, developed by Sun et al. for unidirectionally reinforced composite, to composite laminate. The response of a symmetric and balanced cross-ply glass/epoxy laminate is studied under uniaxial tensile loading at different angles to the material orthotropy axis. It is found that the associated flow rule and a quadratic approximation of the orthotropic potential function provide satisfactory description for the nonlinear strain component under monotonic loading for 15-45° off-axis angle range. The nonlinearity in on-axis loading (modulus degradation)is well described by stiffness reduction due to the cracks in transverse plies. Meanwhile the change of elastic modulus due to intralaminar cracking can be neglected in off-axis loading, but the possible intensification of nonlinear deformation in off-axis loading caused by the presence of intralaminar cracks agrees well with orthotropic potential formalism.

Place, publisher, year, edition, pages
2002. Vol. 36, no 18, p. 2125-2134
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-4677DOI: 10.1177/0021998302036018976Scopus ID: 2-s2.0-0036381236Local ID: 2a8da5f0-a26e-11db-8975-000ea68e967bOAI: oai:DiVA.org:ltu-4677DiVA, id: diva2:977551
Note
Validerad; 2002; 20070112 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Sparnins, EdgarsVarna, Janis

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