Work-conjugate stresses
Stretch and shear a cube. The live tensors are P, S, and σ from the same Saint Venant–Kirchhoff energy; yellow is the Piola traction on the reference face, blue the Cauchy traction on the deformed face.
Work-conjugate stresses
Deformed configuration
½ S : E = 0.00
P (1st Piola)
S (2nd Piola)
σ (Cauchy)
P N σ n