Hyperelastic materials

Hyperelastic materials are nonlinear elastic materials, designed for modeling rubber or rubber-like materials in which the elastic deformation can be extremely large. Where a typical plastic or metal can stretch 2-3% and recover from the deformation, a hyperelastic material can stretch up to 500% and still recover.

Hyperelastic materials are characterized by a fully incompressible or nearly incompressible behavior. While fully incompressible behavior is not available in the Fusion, nearly incompressible behavior is achieved by specifying a high value for the volumetric distortion constant (D1).

Hyperelastic material simulation is based on strictly elastic behavior. Regardless of the complexity of the stress-strain characteristics, all materials return to their original shape when unloaded (no permanent deformation occurs.) Hyperelastic materials in Fusion are modeled using the 2-constant standard Mooney-Rivlin material model.

The Fusion material libraries do not contain predefined hyperelastic materials. You must create your own hyperelastic material definitions in the Favorites library, which you can optionally copy to a user-created Hyperelastic Materials library.

You can select hyperelastic materials for use in any simulation study. For linear analyses, only the basic material properties are used and your hyperelastic material is approximated as a linear isotropic material. For nonlinear analyses, the advanced properties that you provide are used, in addition to Density from the basic properties.

Studies that use only basic material properties	Studies that use advanced hyperelastic material properties
Static stress	Nonlinear static stress
Modal Frequencies	Quasi-static Event Simulation
Structural Buckling	Dynamic Event Simulation
Thermal
Thermal Stress
Shape Optimization
Electronics cooling