Spring's performance is mainly determined by its own material, usually a metal's performance will be produced under the action of alternating stress, fatigue, when fatigue after reaching its limit performance will be significantly fell straight to directly damage.

Fatigue stress are materials, components and structure of fatigue damage resistance. In the regulation of cyclic stress amplitude and a large number of repetitions, the material can withstand maximum alternating stress. Fatigue damage is one of the mechanical parts of the main causes of failure.

According to statistics, about 80% more than in the mechanical parts failure belongs to fatigue damage, and no obvious deformation before fatigue damage, so the fatigue damage often cause serious accident, so for the shaft, gear, bearing, blades, such as the spring under cyclic loading to choose good material to make fatigue strength.

Metal under the action of alternating stress, when the alternating stress value is far lower than the yield strength of material, after running for a long time will happen damage, the damage is called fatigue damage.

In the case of a load is higher than the fatigue strength, fatigue damage will occur. Or in the case of continuous plastic deformation will produce fatigue. Under dynamic loading conditions, especially the intrinsic defects in the sheet, under the condition of general product that happens more frequently.

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