For the forecasting of delamination initiation and propagation, a previously defined meso-scale damage model of composite laminates is used. At the meso scale, the laminate is described as an assembly of damageable layers and interlaminar interfaces. The aim of this work is to identify precisely the interlaminar interface model for ±θ interfaces, with θ = 0 °, 22.5 ° and 45 ° being the relative directions of the fibres of adjacent plies. This identification is based on initiation and propagation delamination tests. Our analysis of the conventional propagation tests makes use of the links existing between the critical-energy release rates and some of the model's parameters. In taking into account the part of the energy dissipated inside the layers, the interfaces can be classified into two categories: the 0 °/0 ° interfaces of brittle behaviour, and the interfaces at disorientated angles whose criticalenergy release rate is greater. Standard edge-delamination tension tests are also conducted and analysed in order to identify the other parameters of the interface damage model.
Composites Science and Technology – Elsevier
Published: Jan 1, 1998
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