Analytical and numerical investigation of the length of the cohesive zone in delaminated composite materials
An accurate prediction of the length of the cohesive zone ahead of a crack tip is fundamental for the correct simulation of delamination in composite materials under both quasi-static and fatigue loading. To ensure a correct dissipation of energy during delamination propagation, several cohesive fin...
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| Other Authors: | , , |
| Format: | book |
| Language: | eng |
| Published: |
2008
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| Subjects: | |
| Online Access: | https://repositorio-aberto.up.pt/handle/10216/101020 |
| Country: | Portugal |
| Oai: | oai:repositorio-aberto.up.pt:10216/101020 |
| Summary: | An accurate prediction of the length of the cohesive zone ahead of a crack tip is fundamental for the correct simulation of delamination in composite materials under both quasi-static and fatigue loading. To ensure a correct dissipation of energy during delamination propagation, several cohesive finite elements have to span the cohesive zone. The length of the cohesive zone depends on the material properties, the geometry/size of the structure, and on the loading mode. This chapter presents new expressions to estimate the length of the cohesive zone under general mixed-mode loading conditions and for finite-sized geometries. The analytical model is validated by comparing its predictions with numerical results based on cohesive-zone models. The relevance of the proposed analytical solutions to the effective simulation of delamination is demonstrated by simulating delamination growth under mixed-mode loading using meshes with the length of the elements greater than the cohesive zone length. |
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