ABSTRACT
Commercial Finite element methods software packages like MARC or ABAQUS provide the well known hyper-elastic and viscoelastic material models for rubber, the Ogden model or Prony series. Since ABAQUS is geared towards an Eulerian description of constitutive equations, the MORPH model has to be adapted to accommodate to this formulation. In addition, efficient methods to compute the material stiffness matrix are shown. Finally some results of 3D ABAQUS simulations using the MORPH material model are presented. The Morph Constitutive Model was developed to simulate large deformations in highly filled elastomers, with the main focus on the reproduction of the Mullins softening. To simulate rubber components with an adequate precision, a constitutive model is needed, which reproduces the complex material behaviour of filled rubber. This includes at least highly nonlinear stress–strain curves, hysteresis and the softening after prestrain known as the Mullins effect.
