Material Modeling in FEA 4

[ninjaz]

Is there any specific technique called Material Modeling in FEA . What is the scope of this technique. I tried to research this term in google, but only got some Medical papers use this technique in FEA . Nowhere I could get this term defined in detail.

 

[ShellsPlatesMeshes]

That expression is too obscure. If you have a clearly stated problem, it may be a topic for discussion.

 

[ninjaz]

Thank for the response ShellsPlatesMeshes.
I was came to look this term while looking on research papers on FEA.
I dropped this question here just because of my curiosity.

The following sources made me to know more about this term FEA material modeling.

1."FEA consists of a computer model of a material or design that is stressed and analyzed for specific results"

2.The effect of material modeling on finite element analysis

http://www.ncbi.nlm.nih.gov/pubmed/22865575

3.Understanding and Coping with Material Modeling Limitations in FEA

http://www.testpaks.com/papers-ppts/NAFEMS2010DTL.pdf

In all the above documents, material modeling term was used but not defined exactly to know its purpose or meaning.
So, just i thought Here .I may find some words from people who might have experience in the term.

 

[ShellsPlatesMeshes]

OK, thank you for the information. I think that the term, generally, means: when we intend to model a particular body or structure, should we assume that the material is elastic, or plastic, or incompressible elastic (like rubber - this is a special case for FEA and may require using hybrid models, when both displacements and stresses appear in the vector of unknown variables), etc. Other specific features may (or should) also be taken into account: the material may be not isotropic, but orthotropic, or even have some general anisotropic properties. The material may or may not manifest fatigue, depending on the actual loading conditions, etc. So there is a huge variety of different material properties and models that are to be taken into account when the engineer is building a particular FEA model.

 

[IRstuff]

Seems pretty clear to me. Biological materials are not the typical solids that are dealt with in typical ME applications. Flesh is amorphous, heterogeneous, soft & squishy, and complex, while engineering materials tend to be homogeneous solids.

As such, if you are doing typical FEM analysis with engineering materials, you straying from the norm.

TTFN
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[ninjaz]

Thank you Shellplatemeshes , IRStuff.

So ,Is this term "Material Modeling" deals with creating a "Material Property" to apply in FEA provided that this material property should match with the real material we try to simulate ??

 

[rickfischer51]

Nope. First, you have to determine which material constitutive model accurately represents the response of the material you are analyzing. Next, you check to see if the finite element code you have has that constitutive model. If it does, you test your material to get the necessary material properties required by that constitutive model. IF not, you can find another finite element code, write a user material model if your code allows that, or try and make do with the materials your code does support. The first option can be costly, the second option typically requires programming skills, thorough knowledge of material science and considerable finite element experience, and the third option also requires thorough knowledge of material science and considerable finite element experience.

Rick Fischer
Principal Engineer
Argonne National Laboratory