Non Linear Yield points format

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thschrader
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Posts: 3129
Joined: Sat May 20, 2017 12:06 pm
Location: Germany

Re: Non Linear Yield points format

Post by thschrader »

BDL42 wrote: Sat May 20, 2023 6:54 pm In the US WEZ is refered to as HAZ Heat Affected Zone. For interpreting your results after simulation, do you multiply the yield of the material by the WEZ factor? (Reducing the yield in those volumes?)
...
Yes, I used the HAZ-values for approximating the Ramberg-Osgood relation.
Mmmh, the approximation is more or less good.
The question is, is it smart to reduce the yield for the complete body?

For steel there is no problem, the base material allways yields first,
I can neglect the weldings, so I can use the bilinear stress-strain relation for the complete part.
But for alu? Here it is the opposite. Can I use the reduced yield for the complete body?
After your questions I am no longer sure.

Or you define 2 nonlinear materials for ccx. If possible, I have never done this.

Here is the Smath-file for self-investigating, download Smath here (free):
https://en.smath.com/view/SMathStudio/summary

Rename file extension to "sm":
AW6060T66_Ramberg_Osgood_sm.txt
(1020.64 KiB) Downloaded 30 times

curve_nonlinear.JPG
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thschrader
Veteran
Posts: 3129
Joined: Sat May 20, 2017 12:06 pm
Location: Germany

Re: Non Linear Yield points format

Post by thschrader »

thschrader wrote: Mon May 22, 2023 4:06 pm ...
Or you define 2 nonlinear materials for ccx. If possible, I have never done this.
...
This works. You can define a nonlinear approximation for the base material and for the weldings.
As you can see, the stress in the plate is high, but the plastic deformation starts in
the welding.
stress_strain_approximation.JPG
stress_strain_approximation.JPG (76.49 KiB) Viewed 448 times
sigma_plastic_strain.JPG
sigma_plastic_strain.JPG (59.68 KiB) Viewed 448 times
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