Next: *DENSITY
Up: Input deck format
Previous: *DASHPOT
Contents
*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:
![$\displaystyle E\epsilon=\sigma + \alpha \left( \frac {\left\vert \sigma \right\vert }{\sigma_0} \right)^{n-1}\sigma$](img931.png) |
(166) |
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:
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.
guido dhondt
2014-03-02