T he state of stress at a point on an element is shown in figure (a). The same state of stress is shown in another coordinate system in figure (b).

The components $(\tau _{xx},\tau_{yy},\tau _{xy})$ are given by

- $(p/\sqrt{2},-p/\sqrt{2},0)$
- $(0,0,p)$
- $(p,-p,p/\sqrt{2})$
- $(0,0,p/\sqrt{2})$