1. Contact fatigue failure
Contact fatigue failure means the bearing surface by alternating stress failure. Contact fatigue spalling occurred in the bearing surface, often accompanied by fatigue crack, starting with the maximum alternating shear stress at the contact surfaces of the following, and then extended to the surface to form a different shape of spalling, such as point-like pitting or pitting peeling flaking into small pieces called shallow spalling. Due to the the flaking surface gradually expand, while often extended to the deep, forming deep peeling. The deep peel off contact fatigue failure fatigue source.
2. Wear Failure
The wear failure refers to relative sliding friction between the surfaces to lead to its work surface metal constantly wear arising VALID. Continuous wear will cause the bearing parts gradually corrupted and eventually lead to bearing loss of dimensional accuracy and other related issues. The abrasion may affect the shape change, with the gap increasing and work surface morphology changes may affect the lubricant or its pollution reaches a certain level and cause lubrication complete loss of function, thereby bearing the loss of rotation accuracy even can not operate normally. The Wear Failure is one of the common failure mode of all kinds of bearings, wear form usually can be divided into the most common abrasive wear and adhesive wear.
Refers to the bearing surface between the abrasive wear debris and contacts the surface of the squeeze inward hard particles or hard foreign or metal surfaces caused by the relative movement of the wear, and often in the bearing surface to cause galling of the furrow-shaped. Hard particles or foreign matter may come from the host internally or from other adjacent parts of the host system by feeding inside the bearing lubrication medium. Adhesive wear means uneven force are due to the microstructure of the friction surface of the friction surface bumps or foreign objects in the serious deterioration of the lubrication conditions, due to local friction and heat, could easily lead to local friction surface deformation and friction phenomenon of micro-welding, serious when the surface of metal may be partially melted, the force of the contact surface will be a point of local friction welding torn from the substrate increases the plastic deformation. Adhesive - adhesive wear and tear - adhesion cycle constitutes, in general, a slight adhesive wear is called abrasions, severe adhesive wear called the bite.
3. Fracture failure
Bearing fracture failure mainly due to the defects overload two factors. When the applied load exceeds the material strength limit, causing parts breakage called overload fracture. Overload Host sudden failure or improper installation. Bearing parts of the micro-cracks, shrinkage, bubbles, bulk foreign debris, overheating organizations and local burn defects in shock overload or excessive vibration will cause the defect at the break, called the lack of fracture. It should be noted that, bearing retest of the raw materials into the plant, forging and heat treatment in the manufacturing process, quality control, process control can be correctly analyzed by the instrument above defect exists, control must be strengthened in the future. But, in general, usually bearing fracture failure failure most of overload.
4. Changes in clearance failure
Bearing due to external or internal factors at work, so that the original with the gap changes, reduced accuracy, and even cause "killed" called the clearance change failure. External factors, such as excessive interference is not installed in place, the amount of temperature rise due to expansion, instantaneous overload, internal factors such as residual austenite and residual stress in an unstable state and so is the main reason for the changes in the clearance failure.


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