... observed behavior of fiber composites, not only for uniaxial stress-strain curves, but also for multiaxial failure envelopes. The fitting capabilities for multiaxial failure envelopes are superior to the Tsai–Wu criterion, which has so far been considered as overall the best model for laminates. 5...

..., respectively. This approach can be used to approximatively represent the behavior of a mildly anisotropic material such as a PVC foam. However, it cannot represent correctly the mechanical properties of strongly anisotropic materials such as fiber composite...