The Predictive Capability of Failure Mode Concept - Based Strength Conditions for Laminates composed of UD understatic Tri-Axial Stress States

This paper represents the author’s contribution to the Second World-Wide Failure Exercise (WWFE-II) using his Failure Mode Concept (FMC) modelling capability. The WWFE-II deals with the behaviour of isotropic material and unidirectional (UD) as well as multi-directional UD laminae-composed laminates subjected to three dimensional (tri-axial) states of stress. 12 challenging Test Cases were provided by the organisers and those covered stress-strain curves and failure envelopes under 3D stress states. The application of the new FMC model has extended the modelling from 2D into 3D situations and has taken into account the effect of hydrostatic pressure and 2nd glass temperature shift factor on the stress strain curves and failure envelopes. The FMC 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 WWFE-II.