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Experimental and Numerical Studies of Initial Cracking in CFRP Cross-Ply Laminates
Department of Aerospace Engineering, Tohoku University.
Department of Aerospace Engineering, Tohoku University.
Department of Aerospace Engineering, Tohoku University.
Department of Aerospace Engineering, Tohoku University.
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2015 (English)In: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840, Vol. 68, p. 81-89Article in journal (Refereed) Published
Abstract [en]

This work is concerned with the conditions for formation of the first (initial) cracks in composite laminates with cutouts or ply drop-offs subjected to in-plane loading. We study here the crack formation on the free edge of CFRP cross-ply laminates experimentally and by numerical stress and failure analysis. The free-edge surface strains are measured by the digital image correlation (DIC) technique. The numerical analysis consists of a two-scale approach, where the macro-level analysis is performed with a three-dimensional finite-element method (3D FEM) and the micro-level analysis uses a periodic unit-cell (PUC) in the transverse plies. The constitutive assumption made for the macro-level analysis is an orthotropic linear thermo-elastic solid for the unidirectional plies with a thin isotropic viscoplastic layer between the longitudinal and transverse plies. In the PUC, the fibers are assumed linear elastic, while the matrix is modeled as an elastic-viscoplastic solid. Crack formation is assumed to occur in the matrix by the dilatation induced brittle failure mechanism for which the dilatation energy density criterion is used.

Place, publisher, year, edition, pages
2015. Vol. 68, p. 81-89
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-6553DOI: 10.1016/j.compositesa.2014.09.020ISI: 000346452400010Scopus ID: 2-s2.0-84908043066Local ID: 4c9bbfc1-9ae5-4587-8dd6-5a7580d6b05eOAI: oai:DiVA.org:ltu-6553DiVA, id: diva2:979439
Note
Validerad; 2015; Nivå 2; 20140930 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Talreja, Ramesh

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