(1) scratch (two-body abrasive wear)
Movement together with the shaft diameter of hard particles and the friction surface contact, which is the low contact stress of the particles with the metal surface, they draw linear scar on the bearing surface; semi-hard particles embedded in the bearing surface of the shaft diameter on the surface will be designated a linear scar, known as the scratch. Scratch is a two-body abrasive wear, linear scars in the direction of the shaft diameter direction of movement.
Lubricant film rupture, shaft diameter surface of the wheel peak will scratch the bush, many linear scars, it is also a two-body abrasive wear.
Hard particles embedded in the bearing surface and fall off, resulting in a point-like scars of scratching.
These particles are mostly the end of iron and sand.
Scratching led to friction surface roughening, thereby reducing the carrying capacity of the lubricant film, and formation of new hard particle scratch the surface of friction and wheel hub peaks, resulting in a vicious cycle.
(2) (three-body) abrasive wear
Small hard particles into the bearing clearance, wavering between the two friction surfaces in the high friction surface contact stress, constitute the three-body abrasive wear, similar to the abrasive, so that the bearing and shaft surface wear. High contact stress in the hard particles and the friction between the surface of the ductile metal friction surface of the plastic deformation or fatigue damage, brittle metal friction surface of the brittle fracture or spalling.
Abrasive wear scar is also a linear direction in line with the shaft diameter direction of motion.
When the edge of the contact, the lack of oil or oil film rupture will result in severe abrasive wear. The abrasive wear will cause the shaft diameter and (or) bearing geometric size and shape change, loss of precision bearing clearance is increased, the sharp deterioration in life expectancy before sliding bearing performance.
Bite stick (glue)
The state of the lubricant film break or short of oil, a large friction factor resulted in a lot of frictional heat, bearing temperature. , A friction surface of the low melting point metal at high temperatures due to softening of adhesion in the other friction surface on the adhesion of the metal from the original surface, with the shearing of the shaft diameter rotating movement, detachment, transfer to another friction surface, apparent friction surface pits and convex-shaped scar. This damage is adhesive wear.
Bite stick, the friction increases sharply, bearing temperature is further increased, creating a vicious cycle. When severe adhesion, the shaft diameter rotating power is no longer able to cut open the bonding point, will enable the shaft diameter movement termination, commonly known as the axle, bearings completely damaged.
(4) fatigue wear
The fatigue wear, also known as the fatigue damage. Repeated under cyclic loading in the direction vertical to the sliding direction, the friction surface of a fatigue crack, crack perpendicular to the bearing surface to the depths of the development to the lining and backing of the joint surface, go to run parallel with the friction surface, last material from the friction surface was flaking off, resulting in crater-like damage.



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