hello Fadi,

        recently i am looking for the same values of
single crystal silicon. the fracture strength depends
on the scale of the silicon, and for bulk is usually
quoted around 200-300MPa w/ tension. The (theoretical) ultimate
yield strength is much higher. I found only one theoretical
(listed below) calculation for the tensile strain
in the [100] direction, and is around 25GPa.
The strength changes for hi temperatures. i have couple
of old papers on that if you need them.
        if you find good references, i would appreciate it
if you can share them.

        On the Ultimate Yield Strength of Solids
        Arthur L. Ruoff
        J. Appl. Phys. 49 January 1978 pp197-200

good luck,
Jia Chen
Graduate Student
Cornell University



On Wed, 3 Feb 1999, Fadi Ben Achour wrote:

> Hello
> I am a graduate student at University of Minnesota and I am looking from
> mechanical properties of Silicon. More specifically i want the value of
> the stress at which silicon would fail in , compresion and tension. If you
> can kindly send this information with a refrence it will be greatly
> appreciated.
>
> Fadi Ben Achour
>
>
>
>
>