Stretch tensor

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Principal stretch ( $λ_{i} > 0$ )

The principal stretches are the eigenvalues of a stretch tensor, or equivalently the singular values of the deformation gradient. They measure local length ratios along the principal reference directions.

Right stretch tensor ( $U = (F^{T} F)^{1/2}$ )

Left stretch tensor ( $V = (F F^{T})^{1/2}$ )

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