Hello
The Documentation materials related to some models (like Drucker-Prager) implies that softening can be used under each of
*DRUCKER PRAGER HARDENING
The classic meaning of softening is that your Yield Stress starts to decrease while your Absolute Plastic Strain Rate is still increasing (dS/de <0 where S is stress and e is strain). is not it ? However, ABAQUS says that "HYDROSTATIC PRESSURE VALUES MUST INCREASE WITH INCREASING PLASTIC STRAIN"
I expected intially this message particularly knowing that ABAQUS implicit cannot handle the stiffness being negative at unless you use Riks Step/technique or Explicit Step.
I start to think that softening intended by ABAQUS means that both the Yield Stress and Absolute Plastic Strain Rate are decreasing. But that in fact would be unloading rather than softening.. would not be?
Please give me your opinion on this matter
The Documentation materials related to some models (like Drucker-Prager) implies that softening can be used under each of
*DRUCKER PRAGER HARDENING
The classic meaning of softening is that your Yield Stress starts to decrease while your Absolute Plastic Strain Rate is still increasing (dS/de <0 where S is stress and e is strain). is not it ? However, ABAQUS says that "HYDROSTATIC PRESSURE VALUES MUST INCREASE WITH INCREASING PLASTIC STRAIN"
I expected intially this message particularly knowing that ABAQUS implicit cannot handle the stiffness being negative at unless you use Riks Step/technique or Explicit Step.
I start to think that softening intended by ABAQUS means that both the Yield Stress and Absolute Plastic Strain Rate are decreasing. But that in fact would be unloading rather than softening.. would not be?
Please give me your opinion on this matter