Interaction of Matrix Cracking and Delamination in Cross-ply Laminates: Simulations with Stochastic Cohesive Zone Elements |
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Authors: | Zahid R Khokhar Ian A Ashcroft Vadim V Silberschmidt |
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Affiliation: | (1) Loughborough University, Leicestershire, UK |
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Abstract: | Two main damage mechanisms of laminates—matrix cracking and inter-ply delaminationare closely linked together (Joshi and Sun
1). This paper is focussed on interaction between matrix cracking and delamination failure mechanisms in CFRP cross-ply laminates
under quasi-static tensile loading. In the first part of the work, a transverse crack is introduced in 90o layers of the cross-ply
laminate 01/904/01], and the stresses and strains that arise due to tensile loading are analyzed. In the second part, the
cohesive zone modelling approach where the constitutive behaviour of the cohesive elements is governed by traction-displacement
relationship is employed to deal with the problem of delamination initiation from the matrix crack introduced in the 90o layers
of the laminate specimen. Additionally, the effect of microstructural randomness, exhibited by CFRP laminates on the damage
behaviour of these laminates is also accounted for in simulations. This effect is studied in numerical finite-element simulations
by introducing stochastic cohesive zone elements. The proposed damage modelling effectively simulated the interaction between
the matrix crack and delamination and the variations in the stresses, damage and crack lengths of the laminate specimen due
to the microstructural randomness. |
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Keywords: | |
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