I have some experimental data from tension tests,compression tests on a material and need to formulate a model using Johnson cook's approach (paper: "A Constitutive model and data for metals subjected to large strains, high strain rates and high temperatures")
I understand that the main task in formulating this model is getting the constants based for Johnson Cooks model based on the experimental data.
I'm sure many experts here would have used Johnson Cooks model and got the constants using their experimental data.
Can anyone help by providing the process to evaluate the constant from a True Stress Vs True Strain curve.
Any sort of help will be really appreciated.
What data do you have? There are several ways: You can first use a fit routine (even gnuplot can do this) to fit A,B and n to your RT data t low strain rates and then later fit C and m to your rate- and temp-dependent data, or you can fit all 5 simultaneously.
What is best depends on what data you have.
If you have only one sress-strain curve, you can only fit A,B,n.
What data do you have? There are several ways: You can first use a fit routine (even gnuplot can do this) to fit A,B and n to your RT data t low strain rates and then later fit C and m to your rate- and temp-dependent data, or you can fit all 5 simultaneously.
What is best depends on what data you have.
If you have only one sress-strain curve, you can only fit A,B,n.
I used the Johnson-Cook model to describe the behavior of Inconel 718 submitted to the blanking process. I've used some simplifications, but I think this work can help you with something.
Conference Paper Numerical analysis of the blanking process of Inconel 718 sh...
I have the same problem, please anyone tell me that how to Evaluate the constants Like (A, B, C,n, D1, D2, D3, D4, D5,m, etc) through tensile test.?
This paper explains:
A,B,n,C,m
Elasto-plastic deformation - Tensile testing
Viscous-plastic deformation - Dilatometer
Thermal softening - Split-Hopkinson apparatus
D1, D2, D3... is for the J-C damage model, it is another equation.
Its worth to see:
Article Determination of Material Constitutive Laws for Inconel 718 ...
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