کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
251412 | 502932 | 2015 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Bilinear approximations to the mixed-mode I–II delamination cohesive law using an inverse method Bilinear approximations to the mixed-mode I–II delamination cohesive law using an inverse method](/preview/png/251412.png)
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.
Journal: Composite Structures - Volume 122, April 2015, Pages 361–366