Question about the STATEV in UMAT [Archive] - PolymerFEM

siuchun

2011-04-20, 03:40

I know in UMAT, the variables stored in STATEV array like this:

STATEV(1-6) - elastic strain components
STATEV(7-12) - plastic strain components
STATEV (13) - equivalent plastic strain

STATEV (14) - whatever I want to store in STATEV(14)

I tried to store the yield stress in STATEV(14), why the result is zero? even I defined the STATEV(14)=EQPLAS (equivalent plastic strain) , there was still no results. I have defined the *Depvar=14 in advance.

Thanks!

siuchun

2011-04-20, 07:56

Problem has been solved, there has a mathematical mistake in the UMAT.

I know in UMAT, the variables stored in STATEV array like this:

STATEV(1-6) - elastic strain components
STATEV(7-12) - plastic strain components
STATEV (13) - equivalent plastic strain

STATEV (14) - whatever I want to store in STATEV(14)

I tried to store the yield stress in STATEV(14), why the result is zero? even I defined the STATEV(14)=EQPLAS (equivalent plastic strain) , there was still no results. I have defined the *Depvar=14 in advance.

Thanks!