Example: Minimizing Stresses in Objective Function

The task for this example is to minimize the maximum von Mises stress.

Note: Each design response definition of type SIG_TOPO_MISES might only be applied once in either the objective or constraint definition. If stresses should be considered both in constraint or the objective (or several stresses should be combined) for each use one separate design response must be defined.

This task shows you how to:

Define the von Mises Stress in Tosca Structure.gui

  1. Choose Command > DRESP.
    The DRESP menu appears.
  2. Define the SIG_TOPO_MISES as design response in as shown in the following figure:

Tosca Structure Parameter File

The design response for stresses for topology optimization is defined as follows: 


DRESP
  ID_NAME   = TOPO_STRESS_DESIGN_ELEMENTS
  TYPE      = SIG_TOPO_MISES
  DEF_TYPE  = SYSTEM
  EL_GROUP  = <element_group>
  LC_SET    = <load cases>
END_

Response for stresses is applied in the objective function as the following:


OBJ_FUNC
  ID_NAME  = OBJ_FUNCTION_ID
  DRESP    = SIG_TOPO_MISES,<weight_fact_1>, <ref_stress_1>
  ...........
  TARGET = MIN
END_