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Numerical investigation to prevent crack jumping in Double Cantilever Beam tests of multidirectional composite laminates
Faculty
Science
Year:
2011
Type of Publication:
Article
Pages:
1587-1592
Authors:
Sebaey, T. A, Lopes, C. S, Blanco, N, Costa, J
DOI:
10.1016/j.compscitech.2011.07.002
Journal:
COMPOSITES SCIENCE AND TECHNOLOGY ELSEVIER SCI LTD
Volume:
71
Research Area:
Materials Science
ISSN
ISI:000295864000009
Keywords :
Delamination, Fracture toughness, Finite Element Analysis (FEA), Thermal residual stresses
Abstract:
During the experimental characterization of the mode I interlaminar fracture toughness of multidirectional composite laminates, the crack tends to migrate from the propagation plane (crack jumping) or to grow asymmetrically, invalidating the tests. The aim of this study is to check the feasibility of defining the stacking sequence of Double Cantilever Beam (DCB) specimens so that these undesired effects do not occur, leading to meaningful onset and propagation data from the tests. Accordingly, a finite element model using cohesive elements for interlaminar delamination and an intralaminar ply failure criterion are exploited here to thoroughly investigate the effect of specimen stiffness and thermal residual stresses on crack jumping and asymmetric crack growth occurring in multidirectional DCB specimens. The results show that the higher the arm bending stiffness, the lower the tendency to crack jumping and the better the crack front symmetry. This analysis raises the prospect of defining a test campaign leading to meaningful fracture toughness results (onset and propagation data) in multidirectional laminates. (C) 2011 Elsevier Ltd. All rights reserved.
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