The top edge of a 1 by 1 plate is sheared over 0.01 to the right,
and the bottom edge of the plate is sheared over a distance 0.01
to the left.
The material cannot sustain positive principal stress
exceeding 0.002 -- it cracks.
This cracking is modeled with a plasticity model which does
not allow for principal stresses exceeding 0.002; the **group_materi_plasti_tension**
model is used for this.
The plate is modeled with linear triangles (**-tria3**).
The first plot below shows the (deformed) mesh.

The second plot below shows the largest positive principal stress; notice that this principal stress did become equal to 0.002 over the entire tension diagonal.

The third plot below shows the plastic strain; plastic strain does show up especially in the corners of the tension diagonal.

tochnog 2001-09-02