deviatoric stress

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deviatoric stress A stress component in a system which consists of unequal principal-stresses. There are three deviatoric stresses, obtained by subtracting the mean (or hydrostatic) stress (σ) from each principal stress (i.e. σ1 − σ, σ2 − σ, and σ3 − σ). Deviatoric stresses control the degree of body distortion.