The gauge length of the specimen should also be quoted. Tensile ductility f is the nominal plastic strain at failure in a tensile test. Tensile strength ts is the nominal stress at maximum load in a tensile test. MaterialYield stress y is the nominal stress at the limit of elasticity in a tensile test.In structural design, allowable design stress (fs), as used here, are based on a safety factor of 1.65, applied to minimum yield strength, which is generally accepted by the engineering profession. The latter is determined by the unit stress (f) of the railing material and the properties of the railing section — the section modulus (S).Allowable Stress: The unit stress of a metal is determined by its composition and temper. Modulus of Elasticity, psi, 10.0 x 106.Calculations for Structural Design:Basic Equation: When calculating bending stresses, the basis of reasoning is that the bending moment (M) applied to a post or rail must be equaled by the resisting moment.
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