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VUMAT for J2plasticity, rate-dependent johnson-cook hardening can't converge

VUMAT for J2plasticity, rate-dependent johnson-cook hardening can't converge

VUMAT for J2plasticity, rate-dependent johnson-cook hardening can't converge

(OP)
Hi everyone,
I'm a master student learning Abaqus VUMAT coding and I'm writing VUMAT for material with J2 plasticity and rate-dependent johnson-cook hardening as my final project.
Currently, if I exclude the rate-dependent term in johnson-cook hardening then everything works perfectly in single and multi element test, but if I add the plastic strain rate term in the hardening law, then the Newton-Raphson iteration searching the plastic corrector (dPSRM and PSRM) can't converge.

Could anyone take a look at my fortran file and see what may go wrong?

Thank you for your valuable time!
Sixuan Chen

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