Highly nonlinear shape optimization

For highly non-linear calculations is the stress measure not always a good indicator e.g. a structure under plastic deformations will (for ideal plastic) have a large constant stress over the plastic area. For this reason most analysts use a strain measure to inspect these areas.

SIMULIA Tosca Structure.shape optimization supports different strain measures for this purpose, currently only supported by Abaqus and ANSYS®.

This task shows you how to:

Define a stain measure in Tosca ANSA® environment

  1. Choose OBJ_FUNC in Task Manager and select Edit.

  2. In the appeared dialog, select STRAIN_TOTAL as Type:

Define a stain measure in Tosca Structure.gui

  1. Choose Command > DRESP.

    The DRESP menu appears.

  2. Choose STRAIN_TOTAL as type as shown in the following figure:

SIMULIA Tosca Structure Parameter File

  • The resulting command in the parameter file look like follows: 

    DRESP
 ID_NAME        = MY_DRESP
 DEF_TYPE       = SYSTEM
 TYPE           = STRAIN_TOTAL
 ND_GROUP       = design_nodes
 LC_SET         = ALL,1,All
 GROUP_OPER     = Max
END_