Tensile strength definition
Tensile strength is the critical value of the transition of metal from uniform plastic deformation to localized plastic deformation, and it is also the maximum load carrying capacity of metal under static tensile conditions. Tensile strength is the resistance to the maximum uniform plastic deformation of the material. Before the tensile specimen is subjected to the maximum tensile stress, the deformation is uniform, but after the metal is exposed, the neck begins to shrink, that is, the concentrated deformation occurs; Very small) a uniformly plastically deformed brittle material that reflects the fracture resistance of the material. The symbol is Rm (the GB/T 228-1987 old national standard specifies the tensile strength symbol is σb), and the unit is MPa.