Perturbations

Perturbation entities provide a means of defining deviations from the designed structure, such as buckling imperfections. Define the stochastic variation in the material models with the STOCHASTIC keyword option.

Perturbation entities have a display state, on or off, which controls the display of the entity in the graphics area.

LS-DYNA Cards

Card	Description
*DEFINE_STOCHASTIC_VARIATION	Define the stochastic variation in the yield stress and damage/failure models for material models with the STOCHASTIC keyword option. This keyword currently works with materials 10, 15, 24, 81, 98 and the shell version of material 123.
*DEFINE_STOCHASTIC_VARIATION_PROPERTIES	Define the stochastic variation in predefined material model history variables. It is an extension of *DEFINE_STOCHASTIC_VARIATION to more material models and additional material properties. This keyword currently works with materials 10, 15, 24, 81 and 98 as well the shell version of material 123.