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Structural modeling of brittle materials?

Posted 1 avr. 2011, 15:32 UTC−4 Structural Mechanics 1 Reply

Jay Andrews
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I'm fairly new to comsol, and only use it for structural analysis so far.

I have a couple parts made out of Boron Nitride. I'm trying to figure out what they might do in compression, and maybe even in shear.

Maybe it can't be done at all, since I can't find young's modulus or Poisson ratio for the stuff.

Am I just wishful thinking or is there a way to do this?
1 Reply Last Post 1 avr. 2011, 16:43 UTC−4
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago 1 avr. 2011, 16:43 UTC−4
It can be done, but you need the right inputs. You need Young’s modulus and Poisson’s ratio, in addition to failure stresses in different loading modes. Based on the failure stresses you can set up an appropriate failure criterion (such as maximum principal stress or Mises stress).

You can get ballpark estimates of material properties from reliable material libraries such as www.matweb.com. However, there will be significant variability, especially in the failure data. It is best to test the material yourself, or request that info from the company that supplies the Boron Nitride material.

Nagi Elabbasi
Veryst Engineering
It can be done, but you need the right inputs. You need Young’s modulus and Poisson’s ratio, in addition to failure stresses in different loading modes. Based on the failure stresses you can set up an appropriate failure criterion (such as maximum principal stress or Mises stress). You can get ballpark estimates of material properties from reliable material libraries such as www.matweb.com. However, there will be significant variability, especially in the failure data. It is best to test the material yourself, or request that info from the company that supplies the Boron Nitride material. Nagi Elabbasi Veryst Engineering

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