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Ceramics FEA

Ceramics FEA

Ceramics FEA

(OP)
Hello all,

I am modeling an assembly containing some ceramic components and some titanium - basically a ceramics sandwich.  Unfortunately I am not sure which material properties are key for the modeling of the ceramics.  I have the basics: Young's modulus, density, Poisson's ratio - but I am not sure what to put for the Tensile limit.  

Does anybody have an familiarity with performing FEA analysis on ceramics?  I know that there is very little stress shielding, so minor concentrations can lead directly to failure, but what should I be focusing on with this analysis - Principal stress?

For reference, I am using NeiWorks in conjuction with SolidWorks and Nastran.  

RE: Ceramics FEA

Yes, a "simple" principle stress limit criteria is usually used.  Note that the tensile limit is typically a small fraction of the compressive limit.

The space shuttle tiles have been modelled many ways, one of the most successful techniques uses a statistical model built into the FEA, to show effects of "real world" property variations.  Many, many cases are then run to generate a statistical map of low-margin areas or load conditions that may need more work or tighter inspections, etc. etc.

RE: Ceramics FEA

(OP)
Thanks for the quick reply!

I had been advised to study up on Weibull modulus as the statistical nature of ceramic strength was mentioned.  What should be varied during the different cases?  A minor change in the load intensity or direction?  

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