Hello Everyone,
I have a comprehension question regarding the material orientation in ABAQUS. Specifically, I have a VUMAT for anisotropic material behaviour and would like to use that in a cylindrical 3D-model. I understand, in ABAQUS the cylindrical orientation is defined by x=radial, y=tangential and z=axial. Furthermore, I think sigma_11=x, sigma_22=y and sigma_33=z. However, I have determined the model parameters for x=0°, y=90° and z=thickness. So I need a coordinate system defined by x=axial, y=tangential and z=radial. Could someone please help me out on how to proceed? Of course, I can reverse the stress definition in the VUMAT, but that cannot be the solution. So where is my thinking error?
Many thanks in advance and kind regards
Stefan
PS: I am not using CAE since I use a small python script to create the inputfile depending on some variables.
Dear Stefan Offermanns
These tutorials might be useful, have a look:
1. https://www.youtube.com/watch?v=xmXJLQg1wAI
2. https://www.youtube.com/watch?v=DoE7tyTJ23Q
3. https://www.youtube.com/watch?v=KyiLKzAWcQs
Kind Regards
Qamar Ul Islam
Dear Qamar,
thank you very much for the links. I have already watched some of them. Maybe have formulated my question a little unclearly. What I am looking for is a way to swap Z and X in a cylindrical system. I have now fixed this problem by determine the set of material constants for the ABAQUS-cylindrical system. Not really satisfying, but it works.
Best regards
Stefan Offermanns
Hi Stefan,
I believe you can create a datum coordinate system which use different vectors. Then use that datum coordinate system to assign a material orientation.
Hi Yunpei,
thank you very much. I am not so fit in CAE, but I think that creating a "datum coordinate system" with CAE results in an *ORIENTATION card in the input file. However, in a cylindrical system, X is given as the tangential direction and Z as the axial direction. There is obviously no way to change this.
Kind regards
Stefan
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