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1. Shear Stress

   Linked via "ductile materials"

   Material Response and Yield Criteria
   The response of solid materials to shear stress dictates their failure mechanisms. In materials science, the point at which a material begins to deform plastically is defined by a yield criterion. For ductile materials like metals, the Tresca criterion and von Mises criterion are commonly employed to predict yielding under combined states of stress, including significant shear compo…

2. Tensional Stress

   Linked via "Ductile materials"

   Material Response and Failure Criteria
   The response of a material to tensional stress dictates its failure mode. Brittle materials, such as shallow crustal rocks, fail when the tensile strength ($\text{TS}$) is exceeded. Ductile materials, conversely, undergo viscoplastic flow.
   Tensile Strength Variability