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Title: Bilinear approximations to the mixed-mode I-II delamination cohesive law using an inverse method
Author: Morais, Alfredo
Pereira, António Bastos
Moura, M. F. S. F. de
Silva, F. G. A.
Dourado, N.
Keywords: Delamination
Mixed-mode I-II
Mixed-mode bending
Cohesive law
Inverse method
Issue Date: 1-Apr-2015
Publisher: Elsevier
Abstract: This paper presents an experimental and numerical study of the mixed-mode I-II delamination of unidirectional carbon/epoxy laminates. Double cantilever beam, end-notched flexure and mixed-mode bending tests were conducted in order to cover the full range of mode-mix combinations. Finite element cohesive zone models with a bilinear softening cohesive law were subsequently employed to fit experimental load-displacement curves. This required a genetic algorithm to find optimal bilinear softening parameters. Good agreement was achieved between predicted and experimental curves. Furthermore, the bilinear softening parameters showed consistent variations with the global mode-mix that could be interpreted in terms of local damage mechanisms. Nevertheless, further research is needed to define mixed-mode tractions and separations leading to a unique cohesive law.
Peer review: yes
DOI: 10.1016/j.compstruct.2014.11.058
ISSN: 0263-8223
Appears in Collections:DEM - Artigos

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