bConverged

*DEFORMATION PLASTICITY

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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:

$\displaystyle E\epsilon=\sigma + \alpha \left( \frac {\left\vert \sigma \right\vert }{\sigma_0} \right)^{n-1}\sigma$

(152)

where $\epsilon$ is the logarithmic strain and $\sigma$ 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 ( $\nu$ ).
Yield stress ( $\sigma_0$ )
Exponent (n).
Yield offset ( $\alpha$ ).
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.

guido dhondt 2011-03-26