Material under cycle loading, even if the stress below the yield strength is often broken, this phenomenon is known as fatigue fracture. Bearing fatigue fracture, especially the fatigue fracture of high strength bearing materials, before breaking the general no obvious plastic deformation, difficult to detect and prevent, so is very dangerous.
Bearing fatigue refers to materials through countless times should be the maximum stress cycle continues to crack, with the ability to resist fatigue fracture characterization of materials. The simplest method of fatigue strength test material is rotating bending fatigue test. The experimentally measured materials under cyclic stress.
From the figure can be seen, cyclic stress is small, the material more cycles before the split. When the stress is reduced to a certain value, the curve tends to level, that is expressed in the stress, material through countless times of stress cycle without fracture. Engineering requirements, material under cyclic stress acted by a cardinal N without fracture, the maximum stress as the fatigue limit of the material. General circulation base of iron and steel materials 10. Time. When a material is subjected to symmetrical cyclic stress, fatigue limit of material used.
Process of rolling bearing fatigue fracture is the process of the crack surface, internal form, grow up, and the. Adopt the improved design (such as avoid sharp corners, to reduce the surface roughness and avoid the stress concentration measures) and surface hardening (such as surface hardening, chemical heat treatment, shot peening, rolling) can improve the fatigue resistance of components.
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