Abaqus hyperelastic and viscoelastic material models describe large-strain recoverable response and time- or frequency-dependent response, especially for rubberlike materials and elastomeric foams.
How It Works
Hyperelastic models use strain energy potentials to describe finite-strain elastic response. The source lists rubberlike isotropic hyperelasticity, elastomeric foams, and anisotropic hyperelastic behavior. Rubberlike materials are often nearly incompressible, so Abaqus/Standard commonly requires hybrid continuum elements for highly confined nearly incompressible cases, while Abaqus/Explicit requires explicit compressibility because it cannot enforce exact incompressibility at each material point.
The guide also covers stress softening and dissipation in elastomers. Mullins-effect modeling reduces stiffness after prior loading; elastomeric foam energy dissipation and permanent set models capture hysteretic or residual effects.
Viscoelastic behavior appears in time-domain and frequency-domain forms. Time-domain models use relaxation behavior, while frequency-domain models describe storage and loss response. Nonlinear viscoelastic capabilities include hysteresis in elastomers and the parallel rheological framework.
Why It Matters
Elastomer and foam models are strongly tied to nonlinear geometry, incompressibility, test-data calibration, and dissipation. A stable element and procedure choice is part of the material model, not a separate afterthought.
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