Rationalisation of the Tsai-Wu failure criterion

Li, Shuguang, Sitnikova, Elena, Liang, Yuning and Kaddour, Abdul Salam (2017) Rationalisation of the Tsai-Wu failure criterion. 21st International Conference on Composite Materials, ICCM 2017, , Xi'an, China. 20 - 25 Aug 2017. 12 pp .

Abstract

The objective of this paper is to rationalise the empirical aspect of the Tsai-Wu failure criterion associated with the determination of the interactive strength property F12 based on the analytical geometry according to which the condition of closed failure envelope cannot be satisfied by all unidirectionally fibre reinforced composites (UD) and hence should be abandoned. Depending on the way the failure envelope opens, UD composites can be classified into two categories. (a) F12 can be determined uniquely using the conventional strength properties with an additional assumption that the material exhibit very high or infinite strength under triaxial compression at a specific stress ratio; or (b) The Tsai-Wu criterion lead to one of the two scenarios: either allowing infinite strength for an in-plane stress state or to allow infinite strength under infinite number of triaxial stress ratios, some involving tension along fibres. The rationalisation supplements the existing understanding with generic facts which have hitherto not been revealed. The validity of the new assumption can only be proven by experiments which are scarce. A call for relevant experimental data is generated though this paper in order to assess the likelihood of very high or infinite strength.

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Contributors

Author: Elena Sitnikova

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