Hello Ankit,
If you know the material properties then you can change the them in the process setting option-- Advanced options-- molding material edit.
Also you can specify different name for that material.
I have not much idea about downloading the material, but you have the .udb file of any material then you can use it for the analysis.
Thank you,
Sachin
Edited by: Sachin_Bhosale on Sep 25, 2009 3:59 AM