When we need to purchase metal stamping parts, the same experience in sales negotiations, professional knowledge than without professional knowledge to get the offer to be lower this is in the affirmative, then in the procurement of metal stamping parts such as precision terminals, What expertise and terminology should we know about?
Residual stress (yield strength, conditional yield strength): Symbol: σr; unit: MPa (or N / mm2), refers to the metal material after unloading pull call, the standard part of the residual elongation reaches a specified value Stress; when the specified value is 0.2%, its symbol is σr0.2.
Strength limit: Symbol: σ; Unit: MPa (or N / mm2), refers to the maximum resistance of metal materials to the role of external damage.
Intensity according to the different forms of external force is divided into:
Compressive strength: symbol σbc, refers to the external force is the strength of the pressure limit
Flexural strength: symbol σbb, refers to the external force perpendicular to the axis of the material, and after the role of bending the material was the strength limit
Shear strength: the symbol σc, refers to the external force perpendicular to the axis of the material, and shear strength of the material limit
Tensile strength: Symbol: σb, refers to the external force is the tensile strength limit
MPa (or N / mm2) refers to the ability of a metal material to withstand external forces when its tensile force is applied to a certain extent, and its deformation (elongation) increases abruptly when it is very large. The yield strength (physical yield strength): σs; .
Elastic limit: refers to the metal material by external force (tension) to a certain extent, if the removal of external force, the deformation (elongation) that disappear and restore the status quo, elastic limit refers to the metal material resistance to this limit the ability of external forces. |
