Finite and infinitesimal strain

The displacement gradient tensor

Infinitesimal strain and rotation

The axial vector

Finite strain in two dimensions

Lagrangian strain tensor

Infinitesimal strain

Principal strains

Caution there is a sign error in this equation, it should be e1/2 = (e11+e22)/2 +/- ... in this equation!!

Rotation

Dilatatation

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