Double cantilever beam testing of multidirectional laminates
Several difficulties in the double cantilever beam (DCB) tests of multidirectional laminates often prevent valid measurements of the mode I critical strain energy release rate GIc : In this paper, several DCB specimens were analysed with 3D finite element models. The results showed that the undesire...
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| Format: | article |
| Language: | eng |
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1000
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| Online Access: | http://hdl.handle.net/10773/5290 |
| Country: | Portugal |
| Oai: | oai:ria.ua.pt:10773/5290 |
| Summary: | Several difficulties in the double cantilever beam (DCB) tests of multidirectional laminates often prevent valid measurements of the mode I critical strain energy release rate GIc : In this paper, several DCB specimens were analysed with 3D finite element models. The results showed that the undesired effects of residual stresses and of mode-mixity can be minimised. An interlaminar stress based fracture criterion predicts that the GIc of multidirectional specimens is typically 10 – 40% higher than the GIc of unidirectional [08]n laminates. This agrees with the few valid experimental data available. |
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