Lecture 29 Transformations of Stress

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Cauchy Stress Tensor
In 1824, Augustin Cauchy found that one can
use the traction vectors on three independent
planes to represent the stress state at one
material point.
By which, we mean that one can use the trac-
tion components of three independent planes
to uniquely represent those infinite
possibilities.
In practice, we usually use the traction
components on three mutually perpendicular
planes to represent the stress state at one
material point.
Augstin Louis Cauchy (1787-1857) French mathematician:
``
Man dies, but his work lives.’’