Establishing Material Model

[abhiyanta]

Hello All,

I am looking for a way to establish a material model that can be used for FEA with limited experimentation capacity at hand.

The product is very interesting " A Baked Cookie". I am using Pro/Mechanica which asks for following material properties:
1. Young's Modulus
2. Density
3. Poisson's Ratio
4. Ultimate Tensile Strength
5. Ultimate Compressive Strength
4 & 5 required to take care of Brittleness of the cookie

Is there any way to get around with porosity?

Any help much appreciated,

Yugendra

 

[MToft]

The short answer is no, I don't think ProMech can handle non-linear materials directly.

However, it might be possible to approximate overall average behaviour with a sort of "lumped-parameter" model eg if the average cookie region has 5% porosity then reduce the stiffness, density and strength by this amount.

You could also try this for different likelihoods of porosity (eg 95% of the cookie might be only 5% porous but the remaining 5% of the cookie could be 20% porous?!).

As with lots of problems, the answer is probably a sensitivity study on the effect of these approximations.

I've tried something similar as a crude approximation for
casting defects in grey iron...

Good luck,
MToft