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Yield strength is the stress at which a material has undergone some arbitrarily chosen amount of permanent deformation, often 02 percent A few materials start to yield, or flow plastically, at a fairly welldefined stress (upper yield point) that falls rapidlyYield Strength The yield point, or yield strength is the point on a stress–strain curve where elastic behavior ends and plastic behavior begins A more simplified definition is that Yielding means the start of breaking of fibers on the sample being testedWhere sigmasubYS = quasistatic yield strength at the temperature of the fracture test, tsubQ = time to the onset of fracture instability or to the initiation of stable crack extension, and E = Young's modulus at the temperature of the fracture test Tensile Strength Of Steel Vs Yield Strength Of Steel Clifton Steel Yield strength definition