Contents Orthotropic Constitutive Models | 3.3. Strength Models | Print page 3.3.2. VonMisesThe orthotropic material initially will respond elastically to loading until a stress state is reached that exceeds the constant VonMises yield value and the material starts to deform plasticly until failure is reached. « 3.3.1. Elastic 3.3.3. Orthotropic Yield Strength and Hardening Model »