Bilinear approximations to the mixed-mode I-II delamination cohesive law using an inverse method

• Type: Article in International Scientific Journal
• Date: 2015

Authors

de Moura, MFSF (Author) FEUP; A. B. de Morais (Author) Other; A. B. Pereira (Author) Other; Filipe Silva (Author) FEUP; N. Dourado (Author) Other

Journal

Title: Composite Structures

Vol. 122

Pages: 361-366

ISSN: 0263-8223

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 13 Citations

Scopus - 25 Citations

Scientific classification

CORDIS: Technological sciences > Engineering > Mechanical engineering

FOS: Engineering and technology > Mechanical engineering

Other information

Authenticus ID: P-00A-2HN

DOI: 10.1016/j.compstruct.2014.11.058

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6