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UMAT Problem

Submitted by NazBaba on

Hi all,

I am
implementing the constitutive behavior of CuAlNi shape memory alloy during
uniaxial loading using UMAT. My new question is that:

When phase
transformation first starts, umat finds jacobian using my numeric finite
difference method for jacobian. But in same step, stresses and strains cannot
be obtained and then umat uses smaller and different strains and changes
jacobian values. After one step calculation abaqus job finishes with unexpected
error. What could be the problem? What can I do?

 

Thank you.

Stress Softening in UMAT

Submitted by NazBaba on
Hi all,

I am implementing the constitutive behaviour of CuAlNi shape memory alloy during uniaxial loading using UMAT. My question is that:

Stress decreases during phase transformation in our model but I can't do this in UMAT. When stress is needed to decrease, abaqus job stops and there is no change in the command window. I wonder that is there anything which I can do when stress starts to decrease in UMAT? It can be in input file or subroutine file.

Thank you.
Nazım Babacan

Intel Visual Fortran and Abaqus

Submitted by NazBaba on

Hi, I have a laptop with Windows 7 Home Premium 64 Bit. Iinstalled Abaqus 6.10.1 and Microsoft Visual Studio 2008 Professional Edition.

 

When I write abaqus info=system in Abaqus Command. There isa message ;

 

Requirement: Microsoft Visual Studio C++ 9.0 (2008), or10.0(2010)

Products: Abaqus make utility with C++

Status: Fail- Unable to locate or determine the version of aC++ compiler on this system.......

 

Requirement: Intel Fortran Compiler 10.1, or 11.1

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