A material model describes the stress-strain relation for a material. Available material models depend on the type of the active study.
The following is a list of available material models in terms of the type of the active study:
In addition to the above mentioned material models, you can define temperature-dependent material properties.
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The behavior of a material is said to be elastic when its displacement is linearly proportional to the applied load, and returns to its undeformed state when the load is removed.
Elasto-plastic material models are needed to describe the behavior of materials where the stresses exceed the yield point. The basic characteristics of elasto-plastic behavior capture the loading and unloading stress-strain paths and the state of multi-axial stress corresponding to the onset of the plastic flow (yield criterion).
Hyperelastic material models can be used for modeling rubber-like materials where solutions involve large deformations. The material is assumed nonlinear elastic, isotropic, and incompressible.
Elastic materials having the capacity to dissipate the mechanical energy due to viscous effects are characterized as viscoelastic materials.
Creep is a time dependent strain produced under a state of constant stress.
Shape-memory-alloys (SMA) such as Nitinol exhibit the superelastic effect. The term superelastic is used to describe materials with the ability to undergo large deformations in loading-unloading cycles without showing permanent deformations.
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