I am working on crystal plasticity anaisotropic UMAT model for finding plastic strain distribution in the different grains of super duplex stainless steel (1.4410).
I need to include Usermaterial constants in the material section of the ABAQUS model and i m unaware and have no idea how to get these parameters mentioned
strain rate sensitivity exponent ---- N
Reference strain Rate ---- a dot
initial resolved shear stress ---- tau0
Critical resolved shear stress ----- taus
These all parameters are used in Power law formulations (the formulation is attached to this question)
In that formulation halpha alpha is the hardening const of particular slip system
Please help me out in sharing some knowledge on these parameters and in finding out them.
Thanks in advance
Best Regards
Ravva Gaurav
Thank you for the information provided @Wu Shenghua, Could you please explain me in brief what is the inverse method to identify the parameters.
Ravva, what you need is to calibrate your model. To do that you need experimental data or data from literature that are specific for your material. Designing the experiment to calibrate your parameters requires knowledge of the physical metallurgy of your material and the starting texture. Before spending time with the Umat, I suggest you start with the uncoupled crystal plasticity code you have and calibrate it to predict unaxial loading condition (tension or compression) . To see how this is done, please find my article in Acta materialia on strain hardening of titanium. There is a part1 of the article for experimental work in MMTA . After you read these too articles on Ti, you will see how to follow the procedure for your material. If you have questions, contact me. Good luck!
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