How does ALGOR deal with yielding?

Question

How does ALGOR deal with yielding?

LOUDOG (Mechanical)

(OP)

30 Sep 08 13:47

It occured to me today when running an analysis that produced 300,000 psi that i did not know if ALGOR does any yielding analysis. I am assuming that if you are doing a linear stress analysis that the minute you have stresses past the yield point of the material, then the analysis will not be accurate.

swertel (Mechanical) · Answer 1 · 2008-09-30 15:35:27

That is correct.

With a Linear Stress Analysis, Algor (and all FEA programs really) extrapolate the stress/strain curve in the elastic region between 0 and the yield point. Once you exceed the yield stress, it continues along the same slope of the curve to determine stresses at higher strains and/or deflections.

To get accurate results, you need nonlinear material models. I typically run just about everything that I think may exceed yield with bi-linear material models.

--Scott
http://wertel.eng.pro

LOUDOG (Mechanical) · Answer 2 · 2008-09-30 16:22:30

That is too bad. I believe I only have the option to run with linear materials.

If I upgrade Algor to be able to do this, will it also provide failure analysis?

GBor (Mechanical) · Answer 3 · 2008-09-30 20:09:30

By "Failure Analysis" do you mean crack propogation? Or just a Von Mises, or other failure criteria comparison? If the former, you need a different type of analysis software. If the latter, the linear stress post-processor has VM stress and others.

Algor non-linear will handle post-yield behavior and permanent deformation.

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How does ALGOR deal with yielding?