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umat isotropic hardening law

hello everybody

i want to ask when i use isotropic hardening law in umat abaqus. i used uhard subroutine.

my question can be so simple.

how we will enter plasticity values in abaqus. i think in user material after other constant we enter them like this

for exemple:

props(1) young

props(2) poisson ratio

props(3) strain value for the curve maybe 0

props(4) corresponding yield stress value

props(5) other strain value

......

.....

is this right???

thank`s in advance

code error144 and umat isotropy hardening law

hello everybody
i want to develop a constitutive law for fiber reinforced composite. so i am using umat subroutine to simulate it in abaqus.
when i begin analysis i got error code 144.
my question is: is jacobian matrix DDSDDE can be to cause for this error??

back stress

hello everybody

i want to know what is the meaning of back stress and its effect on drucker prager yield criterion for viscoelasticity materials

thank you 

problem with creep analysis using abaqus

hello everybody

when i am trying to make a creep analysis using abaqus and it is the first time i do that

when i submit the job, there is an error and a message appear this message is:

 

 

ERROR: DEGREE OF FREEDOM 11 AND AT LEAST ONE OF DEGREES OF FREEDOM 1 THRU 6 

           MUST BE ACTIVE IN THE MODEL FOR *COUPLED TEMP-DISP. CHECK THE 

           PROCEDURE AND ELEMENT TYPES USED IN THIS MODEL.

 ***NOTE: DUE TO AN INPUT ERROR THE ANALYSIS PRE-PROCESSOR HAS BEEN UNABLE TO 

how to enter some parameters in abaqus

i am new in using abaqus and also in materials analysis fatigue

so i want to use stress ratio R=-1 and R=0 for analysis an aluminium material

so how to define this in abaqus

is it to take in amplitude (periodic) and define A0 and t0 w also the values of A B? IS THIS CORRECT OR NO

thank you 

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