three eigenvalues of the stress tensor, which are called the principal stresses.

Euler-Cauchy stress principle - stress vector

The Euler-Cauchy stress principle states that upon any surface that divides the body, the action of one part of the body on the other is equivalent (equipollent) to the system of distributed forces and couples on the surface dividing the body, and it is represented by a field , called the traction vector, defined on the surface and assumed to depend

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