Critical Resolved Shear Stress (CRSS)

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Critical Resolved Shear Stress (CRSS). Critical resolved shear stress is the component of SHEAR STRESS, resolved in the direction of slip, necessary to initiate slip in a grain. It is a constant for a given CRYSTAL. - PowerPoint PPT Presentation

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  • Critical Resolved Shear Stress (CRSS)Critical resolved shear stress is the component of SHEAR STRESS, resolved in the direction of slip, necessary to initiate slip in a grain. It is a constant for a given CRYSTAL.Tests have been conducted on single crystals of metals to measure the shear stress required to initiate plastic deformation, or cause atomic planes to slip. Since this is a threshold value, it is referred to as critical; and since it is a component of the applied force or stress, it is said to be resolved; that is, the critical resolved shear stress.

  • FCC crystal with 12 slip systems

  • Resolved shear stress is given by = cos cos where is the magnitude of the applied tensile stress, is the angle between the slip plane direction and the direction of the applied force and is the angle between the normal of the slip plane and the direction of the applied force.

  • Critical Resolved Shear Stress (CRSS):- minimum stress to initiate slip, or stress required to initiate slip on a given slip plane and in a given direction [most favorably oriented slip system].

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