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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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ramdas chennamsetti's picture

Hi,

You can calculate the value of 'C' from hardening modulus 'H'. For von-Mises yield function, the relation between 'H' and 'C' is,

H=(3/2)*C

Here, 'H' is slope of the line between sigma and plastic strain in uniaxial loading. Since 'H' can be determined from experiments, 'C' can be found.

I hope this helps,

Best regards,

- Ramadas

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