This paper represents the author's contribution to the second world-wide failure exercise using his failure mode concept modelling capability. The second world-wide failure exercise deals with the behaviour of isotropic material and unidirectional as well as multidirectional unidirectional laminae-composed laminates subjected to three-dimensional (triaxial) states of stress. Twelve challenging test cases were provided by the organisers and those covered stress-strain curves and failure envelopes under three-dimensional stress states. The application of the new failure mode concept model has extended the three-dimensional modelling by taking into account the effects of hydrostatic pressure and second glass temperature shift factor on the stress-strain curves and failure envelopes. The failure mode concept model was capable of successfully solving the majority of all the problems and a comparison between the predictions and test data is planned to be published in Part B of the second world-wide failure exercise.
This paper represents a comparison between the predictions of Cuntze’s Failure Theory, referred to as ‘failure mode concept model, and experimental results provided in Part B of the second World-Wide Failure Exercise. The results covered 12 test cases, involving an isotropic matrix material, 7 UD laminas and 4 multi-directional laminates subjected to 3D states of stress. The UD lamina data, needed for the validation of the failure mode concept-based UD strength conditions, were broadly applicable, whereas the laminate data could only partly serve for model verification because some test cases show some discrepancies. Also, there was a lack of test data in some of the test cases and it is concluded that there is a need to obtain more representative test data. Nevertheless, a good mapping could be achieved by the applied strength conditions dedicated to the specific test case.
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