Hello everybody,
My task is to write a UMAT for Non-linear Viscoelasicity based on Schapery's model in ABAQUS. I have coded the routine, but I am still not able to predict correct response. I tried to debug it as much as I can. I understand that it would be difficult for anybody to understand my code. So, I have attached a flowchart (pdf) of the whole algorithm that I follow. It would be nice if you could check that and correct me if I am wrong.
Thanks in advance for your time and consideration
Regards
Shree
PS. Title of the paper I am referring: Numerical finite element formulation of the Schapery non‐linear viscoelastic material model. Pdf available in RG
You need to describe you physical problem, too. Your code may be correct but if the method is not suitable for the problem you are trying to solve, what can you predict? And it's quite a task you are asking for help.
Hello Mr. Nguyen,
Thanks for the response. I understand that it is a tad difficult. I am just trying to predict the response on a single 1D-Truss element. The material constants have been taken from the paper I attached.
With regard to the paper attached and the non-linear viscoelastic model of Schapery, check if this code might be helpful for your own reference.
@ Anh Tuan Vu.. Thanks for the reply first of all. Btw the code you sent me is actually my code that I uploaded in another question of mine. :(
Back to your original question, what is "correct response"? In other words, are you using this model to predict test result or result from another model? Or does the result just not make good physical sense?
Hello Mr. Nguyen,
Well I am trying to simulate and get the same(similar) results as that of the reference paper. I am able to capture the overall nature of the material behavior but the values do not always match with the experimental data. I hope I answered you.
Thanks and Regards
Shree
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