Study of interface delamination in uni-directional CFRP laminate under static loading condition: Experiments and cohesive zone modelling

Joshi, Sukanya Pravin (2016) Study of interface delamination in uni-directional CFRP laminate under static loading condition: Experiments and cohesive zone modelling. Masters thesis, Indian Institute of Technology Hyderabad.

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Abstract

Interface delamination is reported to be the dominant mode of failure in the stepped lap joints in CFRP composites. The load transfer between the patch and panel takes place through thin adhesive layer. And it being weak link makes it prone to damages. However, not much work was reported in literature to understand the complex mixed-mode delamination of adhesive layer in CFRP laminates. Our study aims at modelling mixed-mode delamination under quasi-static loading conditions for single and double stepped lap unidirectional CFRP composite joint. Modified Cohesive mode-1 Crack and Mixed mode cohesive zone modelling developed by Benzeggagh and Kanane (1995) are used to model the ductile adhesive failure. The mode-1 and 2 fracture toughness required for Beneggagh-Kanane model are obtained through standard experiments. We calibrated the numerical DCB under opening mode loading with the cohesive crack (in method-1) and the mixed mode delamination (method-2) to obtain the cohesive crack length and mixed mode parameter. Through the calibration we showed that the mixed-mode delmaination modelling can be either modelled using the modified cohesive crack or Benzeggagh-Kanane model. The calibrated quantities is used in understnading the single and double stepped lap joint. Modified cohesive crack is superior of Benzeggagh-Kanane model in estimating the damage intiation load and ultimate failure load.

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IITH Creators:
IITH CreatorsORCiD
Item Type: Thesis (Masters)
Uncontrolled Keywords: Interface delamination, mixed-mode loading, TD615
Subjects: ?? sub4.9 ??
Divisions: Department of Physics
Depositing User: Team Library
Date Deposited: 05 Aug 2016 09:02
Last Modified: 05 Aug 2016 10:01
URI: http://raiith.iith.ac.in/id/eprint/2631
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