Anyone who has a knowledge of how can I obtain Tangent Modulus, I am doing a nonlinear statict study.
indeed, it is a simplified linearized representation of the stress-strain curve behind the yield point.
I see in the literature that the bulk-module (K) is often used to calculate the tangent module.
On the bottom of the next wiki-page (see table), you can find how to calculate the bulk-module (K) from the Youngs-module (E) and poissons ration (nu): K = E / 3*(1 - 2*nu)
Young's modulus - Wikipedia, the free encyclopedia
as a first approximation.....plastic strain/(ultimate stress-yield stress)
It seems doable. I will give it a try.
I did perform a nonlinear study with Tangent Modulus defined on the material properties. I duplicated the same study, but I removed Tangent Modulus on material properties. When I run the study without the Tangent Modulus I still get the same results. Does this mean the Tangent Modulus is useless on nonlinear study?
The tangent modulus is only necessary if the material yields. So if no yielding occurs, the results will be the same.
The material did yield. Please check the picture below.
If the stress-strain curve is defined, it will automatically select the curve instead of the tangent modulus. The tangent modulus can only be used in Nonlinear studies, so it can never be useless, unless a SS-curve is defined.
The stress-strain curve that you need to define is only the part after yielding.
Go to the strain plot, and select 'plastic strain' under the advanced options, there you should see differences then.
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