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STRAN in finite strain analysis

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vryy

vryy

Civil/Environmental
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I wonder what is provided in the STRAN variable of UMAT in finite strain analysis (NLGEOM is turned on). In the documentation it said:

In finite-strain problems the strain components have been rotated to account for rigid body motion in the increment before UMAT is called and are approximations to logarithmic strain.

What is the approximation exactly?
 
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This is Hencky strain, EH(F) = 1/2log(F^T F)
 
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