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Effective stiffness concept in bending modeling of laminates with damage in surface 90-layers
RISE, Swerea, SICOMP. Luleå University of Technology, Sweden.
Luleå University of Technology, Sweden.
RISE, Swerea, SICOMP.
Luleå University of Technology, Sweden.
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2016 (English)In: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840, Vol. 82, p. 244-252Article in journal (Refereed) Published
Abstract [en]

Simple approach based on Classical Laminate Theory (CLT) and effective stiffness of damaged layer is suggested for bending stiffness determination of laminate with intralaminar cracks in surface 90-layers and delaminations initiated from intralaminar cracks. The effective stiffness of a layer with damage is back-calculated comparing the in-plane stiffness of a symmetric reference cross-ply laminate with and without damage. The in-plane stiffness of the damaged reference cross-ply laminate was calculated in two ways: (1) using FEM model of representative volume element (RVE) and (2) using the analytical GLOB-LOC model. The obtained effective stiffness of a layer at varying crack density and delamination length was used to calculate the A, B and D matrices in the unsymmetrically damaged laminate. The applicability of the effective stiffness in CLT to solve bending problems was validated analyzing bending of the damaged laminate in 4-point bending test which was also simulated with 3-D FEM.

Place, publisher, year, edition, pages
Elsevier Ltd , 2016. Vol. 82, p. 244-252
Keywords [en]
B. Transverse cracking, C. Analytical modeling, C. Finite element analysis (FEA), Cracks, Delamination, Failure (mechanical), Finite element method, Laminated composites, Laminates, 4-point bending tests, Classical laminate theory, Cross-ply laminate, Delamination length, Effective stiffness, Intralaminar cracks, Representative volume element (RVE), Transverse cracking, Stiffness
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-40988DOI: 10.1016/j.compositesa.2015.11.012Scopus ID: 2-s2.0-84956666458OAI: oai:DiVA.org:ri-40988DiVA, id: diva2:1376991
Available from: 2019-12-10 Created: 2019-12-10 Last updated: 2019-12-10Bibliographically approved

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