PARAM, KTPLAST

Bulk Data Entry Beneficial for problems involving a combination of plasticity, contact, and pretension.

Parameter Values Description
KTPLAST <1 ≤ N ≤ 10000>

No default

Defaults:
  1. There is no effect of KTPLAST if this parameter is not present in the deck.
  2. This parameter should not be specified in the deck without a value.
 PARAM, KTPLAST, N:

The elastic stiffness matrix is used for the first N nonlinear iterations, at each load step. After the first N nonlinear iterations, a consistent elasto-plastic stiffness matrix is used. This allows OptiStruct to hold the element tangent stiffness matrix fixed until the contact nearly converges, and then switch to the standard elasto-plastic formulation.

Comments

  1. PARAM, KTPLAST, N is beneficial for problems involving a combination of plasticity, contact, and pretension.
  2. Currently, PARAM, KTPLAST, N is only supported for solid elements in small-displacement analysis.
  3. It should be used in conjunction with PARAM, EXPERTNL, NO.