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Failure Mechanisms
Fatigue
Creep & stress rupture
Corrosion
Stress corrosion cracking
Ductile and
brittle fractures
Wear
Hydrogen
embrittlement
Liquid
metal embrittlement
Welding
MIG
TIG
Stick
SAW
Corrosion
Corrosion failures
Stress corrosion cracking
Uniform corrosion
Galvanic corrosion
Pitting
corrosion
Crevice corrosion
Marine corrosion
Topics
Explosions
Castings
Boilers
Heat Exchangers
Pressure Vessels
Pipelines
Lifting Equipment
Fasteners
Gears
Bearings
Shafts
Residual Stresses
Chemical Processing
Pulp and Paper
Food Processing
Automotive
Ships
Alloys
Steel
Stainless Steel
Aluminum
Copper
Titanium
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Shaft Failures
Wear is a common cause of shaft failure. Abrasive wear is one of the forms of wear failures. Abrasive wear, or abrasion, is caused by the displacement of material from a solid surface due to hard particles or protuberances sliding along the surface. Abrasive wear can reduce the size and destroy the shape of a shaft. Some examples of abrasive wear of shafts are foreign particles such as sand, dirt, metallic particles, and other debris in the lubricant. This debris can damage a shaft by wear. One of the more common causes of shaft failure is due to fatigue. Fatigue failures commonly start at a stress raiser. Other forms of fracture also commonly occur at stress raisers as well. Some typical features in shafts that act as stress raisers are listed below:
Failures may occur due to misalignment. One cause of misalignment is the mismatch of mating parts. Misalignment can be introduced during original assembly of equipment. Misalignment can be introduced after an overall or repair of equipment. Deflection or deformation of supporting components in service may also cause misalignment. Misalignment can cause vibration resulting in a fatigue failure of the shaft. Some other causes of shaft failures include the following:
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