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  1. vryy

    STRAN in finite strain analysis

    This is Hencky strain, EH(F) = 1/2log(F^T F)
  2. vryy

    STRAN in finite strain analysis

    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...

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