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Mesh-independent cohesive crack model for the analysis of in-plane compression and shear failure in laminated composites

Kawashita, Luiz F., Pernice, M. Francesca and Hallett, Stephen R. 2013. Mesh-independent cohesive crack model for the analysis of in-plane compression and shear failure in laminated composites. Presented at: IV ECCOMAS Thematic Conference on the Mechanical Response of Composites, Azores, Portugal, 25 - 27 September 2013.

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Carbon fibre-epoxy composites exhibit a complex progressive damage behaviour which is controlled by multiple fracture processes that take place within relatively brittle constituents and inter-ply interfaces. The analysis of large structures and multiple interacting cracks is not straightforward and is often considered too complex or costly for practical industrial applications. The authors have recently proposed a simplified mesh-independent cohesive crack formulation that can easily be implemented in commercial FEM software that use explicit dynamic solvers. In the present work a reformulated model is presented which accounts for transverse matrix cracks at variable angles through the thickness. These angles are determined based on three-dimensional damage initiation criteria and the local stress state. This makes the model suitable for the analysis of problems involving in-plane compression and/or high through-thickness transverse shear. The proposed method is applied in the analysis of the interactions between matrix cracks and delaminations in carbon fibre-epoxy laminates. Two test cases are considered, namely the open-hole compression test and a modified Double Cantilever Beam (DCB) test with an angle-ply layup. In the latter, matrix cracks interact with delaminations causing the crack to migrate between different ply interfaces, generating complex fracture surfaces that can be used for model validation.

Item Type: Conference or Workshop Item (Paper)
Date Type: Completion
Status: Unpublished
Schools: Engineering
Centre for Advanced Manufacturing Systems At Cardiff (CAMSAC)
Subjects: T Technology > TJ Mechanical engineering and machinery
Funders: EPSRC
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Last Modified: 19 Mar 2016 09:11

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