Is silicon a linear elastic material? 3

[cane]

I am looking to use a linear elastic material for a finite element analysis. Do any silicon based materials behave linearly before yielding?

If so, where could I locate this info?

Any help would be gratefully appreciated!

 

[GregLocock]

Yes many silicon compounds have a linear elastic range. Silicon dioxide, silicon nitride, silicon carbide, silicon carbonate...

A great source of mechanical properties is

http://www.matweb.com

Cheers

Greg Locock

 

[ivymike]

Sand has a linear elastic range, eh? Not shocking... but the deformations can't be that big either, can they?

 

[GregLocock]

Well, iron filings don't have much of a linear range that's usable either, if it comes to it. Don't forget the wafers used for ICs, they are made of SiO2, and Intel are thinking of going to 12 inch diameter. I bet someone has the job of FE modelling them. Cheers

Greg Locock

 

[IRstuff]

Actually, there not much in the way of analysis with respect to 300 mm wafers; they're roughly twice as thick as the 150 mm, although their stiffness is more than doubled. Most IC manufacturers simply get wafers from Wacker or another supplier and their equipment is built to handle the variations in thickness in the material. The biggest stresses experienced by wafers are thermal ones during furnace operations, mechanical stresses are always minimized as a matter of course to prevent breakage.

Most FEA in the silicon arena is for the micromachined widgets such as accelerometers, gyros, etc.

TTFN