Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/21144
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 |
URI: | http://hdl.handle.net/10773/21144 |
DOI: | 10.1016/j.compstruct.2014.11.058 |
ISSN: | 0263-8223 |
Appears in Collections: | DEM - Artigos |
Files in This Item:
File | Description | Size | Format | |
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paper_coh_law_mixed.pdf | main article | 862.62 kB | Adobe PDF |
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