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Obtaining original coordinates in UMAT when NLGEOM is invoked

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Joined: 12 years ago

Hello all, this is my first thread.

Im currently trying to develop a UMAT for a functionally graded, Neo Hookean material to model a graded rubber material. This requires that I change the properties of the material at each of the Gauss integration points. Since I am considering large deformations, the UMAT seems to only provide me with the [U]current[/U] coordinates (COORDS) of the Gauss points, but I require the [U]original[/U] coordinates.

I searched the forums but wasnt able to come up with a solution on my own. Does anyone know how I can determine the original coordinates within the UMAT when NLGEOM is invoked?

Any advice is appreciated.