Henri Tresca

Henri Tresca was a French engineer who developed a criterion to predict when metals will start to deform or fail under stress. Essentially, he identified that when the difference between the highest and lowest internal shear forces within a material reaches a certain limit, the material is likely to yield or deform permanently. This helps engineers determine safe limits for applying loads to structures and machinery, ensuring they do not fail unexpectedly. Tresca's criterion is widely used in material and structural engineering to analyze and prevent material failure under complex stress conditions.