What reason causes spring failure?

Deformation of spring can in some cases ineffective, and product quality plays a key reason, spring manufacturer parsing different materials in the work of the spring in the whole process is based on its characteristics and standards for work has the certain requirement, because spring work standards, the key is invalid way has a few kinds: 1, plastic deformation, the load caused by the in-situ stress exceeds the tensile strength of material, after, spring can't repair to original specifications and appearance. 2, fatigue fracture, ground stress effect in changes, the spring surface defects, cracks fatigue source, crack expansion after fracture is invalid, telescopic, mark, and sundry place. 3, rapid brittle fracture, some beings spring material defects, manufacturing defects ( Such as scaling, scratch) Defects (conditioning treatment, Excessively high temperature heat treatment crystal, quenching temperature enough to make short ductility of materials) And so on, when suffering from excessive impact load, suddenly produce brittle fracture. 4 and the spring of the application in corrosion caused by stress corrosion fracture is invalid; Application of the spring * accessories easy appear at high temperature stress relaxation and stress relaxation, cause permanent deformation.
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