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*DEFORMATION PLASTICITY

Keyword type: model definition, material

This option defines the elasto-plastic behavior of a material by means of the generalized Ramberg-Osgood law. The one-dimensional model takes the form:

| (189)

where is the logarithmic strain and the Cauchy stress. In the present implementation, the Eulerian strain is used, which is very similar to the logarithmic strain (about 1.3 % difference dat 20 % engineering strain). All coefficients may be temperature dependent.

First line:

- *DEFORMATION PLASTICITY

Following line:

- Young's modulus (E).
- Poisson's ratio ().
- Yield stress ()
- Exponent (n).
- Yield offset ().
- Temperature.

Repeat this line if needed to define complete temperature dependence.

    Example:

    *DEFORMATION PLASTICITY
    210000.,.3,800.,12.,0.4

defines a Ramberg-Osgood law. No temperature dependence is introduced.

Example files: beampl.