August 1, 2018 at 12:30 am
August 1, 2018 at 1:13 amSandeep MedikondaAnsys Employee
ANSYS doesn't have this Ramberg-Osgood curve, so you might have to use the multilinear isotropic hardening model. Just digitize the curve and use the stress-strain data to start with?
Use the tool that Peter recommends here.
August 1, 2018 at 3:49 am
August 1, 2018 at 7:54 amRohith PatchigollaAnsys Employee
The reason for the ? is that Multilinear Isotropic hardening needs stress vs plastic strain data (instead of stress vs total strain, as you can also see from the header of the column) and the first row value for plastic strain should be zero. Since there is a non-zero value for this input, it is not allowed and is indicated by yellow color in this cell.
If you have stress vs. total strain data, you would need to convert this into stress vs plastic strain data (in Excel) before you input it into Engineering data.
In Excel, simply add another column for elastic strain calculations, which would be your current stress divided by elastic modulus.
Then, subtract your column of elastic strain from total strain to get plastic strain, which would be used for input into Engineering Data.
You can leave Temperature field blank.
Hope this helps.
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