About the Two Hole (Relief Notch) Example | ||
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About the Model
High stresses are found in a notch (primary notch) of a component. A second notch (secondary notch) having a short distance to the primary notch should work to relieve the stresses on the primary notch. The optimal shape of the secondary notch should be obtained using shape optimization in order to achieve as low a stress factor as possible in the primary notch:
The stress in the primary notch is only minimal when the maximum stresses in the secondary notch and the primary notch are the same. A distribution of the notch effect takes place at both positions. In order to optimize this effect, a definition must be made using a variable reference value. The definition of following groups is required for the optimization task:
Procedure Summary
Note: For Tosca ANSA® environment :
This optimization task represents an advanced example. The optimization task definition using only the task manager in Tosca ANSA® environment is not possible. This makes the use of the Modules Buttons necessary.
| Model: | twohole.ext |
| Design Area: | Node group design_nodes |
| Design Variable Constraint: | Solid body boundaries for the design nodes |
| Design Variable Constraint: | Fixation of the displacement along the global yaxis for node group fix_y |
| Mesh Smooth: | Mesh smoothing of element group ms_elgr, while free surface nodes remain free |
| Objective: | Minimize the deviation of the maximal von Mises stresses in the primary and secondary notch |
| Settings: | Average nodal displacement, nodal displacements are scaled by factor 2 additionally |
| Stop Condition | The global stop condition is set to 10 iterations |