Notch Optimizing with fixed reference value

For full control over the SIMULIA Tosca Structure.shape controller the user may prescribe a fixed reference value. This can be used to force the homogenization to around a certain value.

This task shows you how to:

Context:

Important:

This is not a stress constraint! It is simply a way to gain more influence over the shape controller.

The effect is clearly seen in the following figure:

The hole plate example is considered with a reference value of 70 N/mm and 120 N/mm:

  • A low reference value enforces more growth
  • A high reference value enforces more shrinkage

Notch Optimize in Tosca ANSA® environment

  1. Select OBJ_FUNC.

  2. Apply New > EQUIVALENT_STRESS.

  3. Set WEIGHT_FACTREF_VALUE to 120:

Notch Optimize in Tosca Structure.gui

  1. Choose Command > OBJ_FUNC.

    The OBJ_FUNC dialog appears.

  2. Select Target= MinMax.

  3. Set RefValue to 120.

SIMULIA Tosca Structure Parameter File

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

    OBJ_FUNC
 ID_NAME        = MY_OBJ_FUNC
 TARGET         = MINMAX
 DRESP          = DRESP_VON_MISES, , 120.  
END_