Hi everybody

I have difficulty to found mechanical features of silicon.
In fact, I would to find  the strength I must apply on a rectangular piece of
silicon to break it:

                        | F (strength around 1.2 N)
*                       |
*                       V
*************************    <- silicon piece h=250um, l=5mm, L=25mm
*
*<--------L------------>


If someone has ever worked on it, please help me