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An evaluation of failure criteria for matrix induced failure in composite materials |
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| Authors: | R Li D Kelly and A Crosky |
| Affiliation: | a School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW 2052, Australia b School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, Australia |
| Abstract: | This paper reports on work being undertaken in the Cooperative Research Centre for Advanced Composite Structures Ltd. (CRC-ACS) to develop improved techniques for predicting the failure of composite materials. The procedures being investigated include a maximum strain criterion for fibre failure. For failure of the resin a new approach, which includes determination of the residual stresses due to manufacturing, is being trialed. This work closely parallels the new criteria proposed by Gosse and Hart-Smith AIAA/CRC-ACS text on composite materials, submitted for publication] and we have subsequently replaced a simple stress criterion for matrix failure with their proposals based on strain invariants. The new procedures are applied to the failure of laminates in bolted joints with complex steered fibre patterns. Thermal residual stress was included to predict the matrix failure of T-section laminates under loads that open the angle between the flanges and the web. Here a transverse tension stress criterion was used. |
| Keywords: | Failure prediction Matrix Strain invariant Thermal residual stress |
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