Evaluation of a trilinear traction-separation law for mode II delamination using the effective crack method. (June 2019)

• Record Type: Journal Article
• Authors: de Morais, A.B.
• Is Part Of: Composites. Volume 121(2019)
• Page Start: 74
• Page End: 83
• Publication Date: 2019-06
• Subjects: B. Delamination -- B. Fracture toughness -- C. Analytical modelling -- C. Cohesive interface modelling; Composite materials -- Periodicals; Manufacturing processes -- Periodicals; Composite materials; Manufacturing processes; Periodicals; 620.11805
• DOI: 10.1016/j.compositesa.2019.03.010
• Languages: English
• ISSNs: 1359-835X

Abstract

Abstract: Mode II delamination testing for measuring the critical strain-energy release rate has reached a high level of maturity with the recent publication of ISO and ASTM standards. Cohesive zone modelling has also become a well-established design tool implemented in many commercial finite element analysis codes. The particularly large fracture process zone in mode II delamination increases the relevance of the traction-separation law. This paper proposes a fairly simple inverse method to evaluate an approximate trilinear traction-separation law from quasi-static end-notched flexure test results. The method employs an analytical beam cohesive zone model and consists of evaluating the parameters that fit the effective crack length versus strain-energy release rate curve. Preliminary studies showed that specific features of the latter curve were quite sensitive to some model parameters. Therefore, accurate approximate trilinear traction-separation laws could be obtained without the extensive numerical calculations typical of inverse methods.