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Kinematic Harderning

Prager's Hardening Rule

Hi all

I am currently investigating Prager hardening room which is stated as the simplist linear kinematic hardening rule. I was wondering if anyone has worked with this model and if so if you have managed to identify how to determine the constant used for the back stress equation

 

dα =C * dεp ( this is epsilon dot p which is the equivalent plastic strain)

 

Please can you let me know how to determine the constant C from experimental results? 

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