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Yield strength σ y Yield strength is defined in engineering as the amount of stress (Yield point) that a material can undergo before moving from elastic deformation into plastic deformation Yielding a material deforms permanently;Measuring Yield Stress Approximate yield stress measurements can be gained by plotting the shear stress values for a range of shear rates, fitting a curve to the data, and extrapolating through the stress axis The intersect on the stress axis gives us our yield stress (figure 2)The minimum yield strength is the key property of steel used in pipeline design See Figure 1110This figure shows the relationship between stress and strain The minimum yield strength is defined as the tensile stress required to produce a total elongation of 05% Nanohub Org Resources 6054 Download Ch07 Stress Strain Pdf Yield strength units imperial