I'm an undergraduate student. Now i'm doing a final project about high velocity impact simulation using LS Dyna and i got a problem about modelling the material modified johnson cook.
I have Stress Vs. Strain data for high speed tensile test
I don't know how to determine the parameter B, n, C, and m from the test results
Can you suggest me how to find the parameter above in modified JC model.
Thanks a lot
Thanks a lot for Majid and Ali for your sugesstion, especially for the attached thesis.
Actually i will model my material into MODIFIED JC, not JC. I saw the differences of the constitutive model between JC and Modified JC in LS DYNA manual Handbook. Furthemore, i found the constitutive model of the modified johnson cook in the other reference, but it was different with in the manual handbook. So which is the right one?
Thanks
To get JC constants, experimental data such as stress strain curves for different strain rates and temperatures in required.
On knowing this data, curve fitting method can be used.
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