Solid Mechanics
Now, assume that the bracket is made from cast iron, a material that is much stronger in compression than in tension. The von Mises criterion, which is isotropic with respect to the stress direction is not suitable in this case. By adding a Safety node, it is possible to check the margins against failure for many different types of materials.
Safety 1
1
In the Model Builder window, under Solid Mechanics (solid) click Linear Elastic Material 1.
2
In the Physics toolbar, click Attributes
and choose Safety
.
The Rankine criterion is suitable for materials where the failure is governed by either the most positive or most negative stress.
3
In the Settings window for Safety, locate the Failure Model section.
4
From the Failure criterion list, choose Rankine.
Here, you can choose to either augment the Structural Steel node under Materials or enter the strength values directly in the Safety node. When a single material is used, it does not matter. When there are several materials in a model, it is a good practice to use the From Material option.
5
From the Tensile strength list, choose User defined. In the associated text field, type
100[MPa]
.
6
From the Compressive strength list, choose User defined. In the associated text field, type
400[MPa]
.
and choose Safety 
.