fedoo.weakform.StressEquilibrium.corate

property StressEquilibrium.corate

Corotational strain mesure for strain.

Properties defining the way strain is treated in finite strain problem (using a weakform with nlgeom = True) corate can take the following str values:

• “log_r” (default): exact logarithmic strain transported by the exact polar rotation increment (strain is recomputed at each iteration). This is the corate with an EXACT simcoon tangent transport, including across committed increments with plastic (or other rotated) history.

• “log”: exact logarithmic strain, XBM logarithmic spin transport (small tangent residual with rotated history)

• “jaumann”: Strain using the Jaumann derivative (strain is incremented)

• “green_nagdhi” or “gn”: Strain using the Green_Nagdhi derivative (strain is incremented)

if nlgeom is False, this property has no effect.