UMAT Help

[vamsi295]

Hi jorgen and all,

I have written a UMAT for anisotropic viscoelasticity based on the attached paper and was unable to get the stress relaxation behavior for the example given in the paper.So I reduced no.of terms to one and tried to implement for a simple cantilever beam.
Please help me where i am going wrong.I am in a bit of hurry

I have not been observing a variation in tip displacement due to changing modulus.I have been working on it for long time.
Please help me..

Thanks in advance
Vamsi

[Jorgen]

I am afraid that I am not familiar with that specific model. I recommend that you put in more print statements in your code to verify that it works as you intended.

It can be time-consuming to debug a user-material model. I can do it for you, but I would have to charge for my time. Send me a private message if you are interested.

Thanks,
Jorgen