

August 2, 2019 at 3:55 pmCri1994Subscriber
Hi everyone,
I'm doing a nonlinear analysis and I'm using a Bilinear model. I have to insert the Yeld stress of material and the tangent modulus.
Where can I find the Tangent modulus of materials?
Thanks for your time
Best regards
Cristiano

August 2, 2019 at 4:53 pmpeteroznewmanSubscriber
A simple bilinear material model called Elastic Perfectly Plastic (EPP) is often used in engineering analysis. The Tangent Modulus is zero. This material model usually provides conservative predictions of failure. That means if you simulate a safety test and pass with this material model, it is highly likely that a physical test will pass since the real material has some nonzero tangent modulus that can carry more load than the EPP material model.

June 22, 2020 at 11:16 am

June 22, 2020 at 2:49 pmSaiDAnsys Employee
Hi,
The Tangent Modulus for a material with Bilinear Hardening (such as the one here) is the slope of the curve beyond the yield stress. In the plot above, the first line with a high slope has a slope of 2E11 Pa (i.e. slope is equal to the Young's Modulus). The second line which has a much smaller slope (and appears almost flat) has a slope equal to the Tangent Modulus i.e. its slop is 1.45E9 Pa.
Hope this helps,
Sai

October 6, 2022 at 10:04 am

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