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Tensile strength, yield strength, and elongation really do not have such a numerical relationship that can be applied Some people have tried to relate tensile strength to yield strength as a rule of thumb, but these relationships really vary due to processing including heat treatmentTensile strength is usually of a higher numerical value than the yield strength of aThe equation of these two stresses (failure) yields σ = 3 F L 2 b d 2 {\displaystyle \sigma = {\frac {3FL} {2bd^ {2}}}} Typically, L (length of the support span) is much larger than d, so the fraction 3 L 2 d {\displaystyle {\frac {3L} {2d}}} is larger than one The Differences Between Stiffness And Strength In Metal Tensile yield strength equation