I am trying to get that article who has derived this Rice and tracey equation (ε_f^*)/ε_f =exp(1/2-(3σ_m)/(2σ_vm )) for multiaxial creep studies. This equation relates the ratio of multiaxial creep ductility to uniaxial creep ductility to exponential of the ratio of hydrostatic stress to von-Mises stress. Some author has taken this equation for their study and referred the following paper.
Rice JR and Tracey DM. On ductile-enlargement of voids in triaxial stress fields. J Mech Phy Solids. 1969;17:201- 217.
However, the above article doesn't show the derivation of the above equation. Can anybody help in finding the article which shows the exact derivation of the above equation or some idea to derive the above equation by seeing the given article. I have added that article for reference.
http://esag.harvard.edu/rice/020_RiceTracey_DuctileVoid_JMPS69.pdf
I would be happy if that link could help you.......
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