Hello parb,

I'm not a Mechanica user but I can give you some general advise. A change to any material property WILL change the outcome to some degree unless of course you're using a "default" material and not changing it. However, it is possible that if the change is relatively close to the previous material properties, it is possible that any change may be too small to notice based on your DOF tolerance and mesh settings.

Let's wait and see if some Mechanica users resond with some definitive advice.

Also we have quite a few FEA meshing tips in our TechBits section and some tips, tutorials and books on Pro/E Mechanica for you to check out. See the links below:

3DCADTips FEA TechBits:
http://www.3dcadtips.com/go.php?topic=1&cat=30

Pro/E Mechanica Tips (18):
http://www.3dcadtips.com/go.php?topic=1&cat=598

Pro/E Mechanica Tutorials (8):
http://www.3dcadtips.com/go.php?topic=2&cat=1348

Pro/E Mechanica Books(18):
http://www.3dcadtips.com/go.php?topic=3&cat=1577

Good luck!
3DCADTips Help Desk