Keyword type: step
This procedure is used to perform a static analysis for materials with viscous behavior. The syntax is identical to the *STATIC syntax, except for the extra parameter CETOL. This parameter is required and defines the maximum increase in viscous strain which is allowed within a time increment. To get an idea of its size one can divide the stress increase one would typically allow within a time increment by the E-modulus.
Notice that the default way of applying loads in a *VISCO step is step loading, i.e. the loading is fully applied at the start of the step. This is different from a *STATIC step, in which the loading is ramped. Using a *VISCO step only makes sense if at least one materials exhibits viscous behavior.