Henri Édouard Tresca (October 12 1814–June 21 1885) was a French mechanical engineer and a professor at the Conservatoire National des Arts et Métiers in Paris. He is the father of the field of plasticity or non-recoverable deformations which he explored in an extensive series of experiments begun in 1864. He is the discoverer of the Tresca (or maximal shear stress) criterion of material failure.
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