Date: 2013-08-20

Effects of environmental conditions on bearing failure

1. failure is one of the basic failure modes of the bearing parts. Breaking into fatigue and brittle fracture broken fault, overload, stress corrosion cracking, hydrogen embrittlement fracture, creep-rupture and other types.
Brittle fracture of bearing parts in running, may make the material brittle due to inappropriate environmental conditions, resulting in brittle fracture, resulting in damage.
Fracture is a fracture of the material the "source", that is, starting point of the fracture.
Brittle fracture of "source" material within the macro-cracks (0.1-1mm), this macro-cracks in parts of the manufacturing process, running processes, as well as the stress concentration in the structure.
Brittle fracture of features is: fracture Shi bear of work stress lower, General does not over material of yield limit, even does not over Xu with stress, so and called low stress crisp broken; in the, and low carbon steel in lower of temperature Xia (100C^-150C) will by toughness State to brittle fracture changes, high strength steel no clear of temperature effect; brittle fracture of fracture flat Qi Guangliang, fracture section shrink is small, and often people words grain or radiation pattern; brittle fracture General is suddenly occurred, will produced many debris.
Ambient temperature directly affects the selection of lubricating greases. In General, when the temperature is below 60 ° c, bearing oxidation reaction is not obvious; however, more than 60 ° c, an increase of 10 ° c, oxidation rate doubled, life of the lubricant may also be halved.
Bearing or lubrication system of lubricating oil to reduce the lubricating parts temperature, you can consider adding cooler or heat sink, to extend the atmosphere humidity on the selection of oils also have some influence. Bearings under conditions of high humidity in the atmosphere, easily lead to mechanical parts metal surface rust, should choose rust inhibitor oil. With high salt content in the atmosphere, should we use on marine lubricants with anti-rust capacity.

 

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