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Where σ 1 = xdirection max shear stress, σ 2 = ydirection max shear stress and σ(y) = yield stress References Engineering Toolbox Stress, Strain and Young's ModulusThe Casson equation can be written as, where σ 0 is the yield stress and η C is the Casson viscosity, which relates to the high shear rate viscosity The HerschelBulkley model describes nonNewtonian behavior after yielding and is basically a power law model with a yield stress term HerschelBulkley equation is written as follows;The Shear strength of a material under pure shear is usually 1/√3 (0577) times its tensile yield strength in case of Von mises criterion and 05 times its tensile yield strength in case of Engineering Purdue Edu Ahvarma Ce 470 S17 Ce470 Aisc Chapter 5 Ce470 Ch 5b Beam Shear Design Pdf Shear yield stress equation