Journal
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
Volume 55, Issue -, Pages 92-107Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2014.03.038
Keywords
Composite materials; Failure; Fibre reinforced; Invariant; Micro-mechanics
Categories
Funding
- SHEFAE European project [314307]
- Portuguese Government's Fundacao para a Ciencia e a Tecnologia [SFRH/BD/88593/2012, FCT-DFRH-SFRH-BPD-78104-2011]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/88593/2012] Funding Source: FCT
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A new three-dimensional failure criteria for fibre-reinforced composite materials based on structural tensors is presented. The transverse and the longitudinal failure mechanisms are formulated considering different criteria: for the transverse failure mechanisms, the proposed three-dimensional invariant-based criterion is formulated directly from invariant theory. Regarding the criteria for longitudinal failure, tensile fracture in the fibre direction is predicted using a noninteracting maximum allowable strain criterion. Longitudinal compressive failure is predicted using a three-dimensional kinking model based on the invariant failure criteria formulated for transverse fracture. The proposed kinking model is able to account for the nonlinear shear response typically observed in fibre-reinforced polymers. For validation, the failure envelopes for several fibre-reinforced polymers under different stress states are generated and compared with the test data available in the literature. For more complex three-dimensional stress states, where the test data available shows large scatter or is not available at all, a computational micro-mechanics framework is used to validate the failure criteria. It is observed that, in the case of the IM7/8552 carbon fibre-reinforced polymer, the effect of the nonlinear shear behaviour in the failure loci is negligible. In general, the failure predictions were in good agreement with previous three-dimensional failure criteria and experimental data. The computational micro-mechanics framework is shown to be a very useful tool to validate failure criteria under complex three-dimensional stress states. (C) 2014 Elsevier Ltd. All rights reserved.
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