Deformation and fatigue fracture of engine accessories:
During the use of an engine, the phenomenon of deformation of parts is called the deformation of parts, which results in changes in the size or shape of the parts due to the action of force.
The deformation of engine components, especially basic components such as cylinder blocks and cylinder heads, will seriously affect the performance of corresponding assemblies and the service life of the engine. Studying the mechanism and influencing factors of component deformation is of great significance for preventing component deformation and repairing deformed parts.
The deformation of parts includes two types: elastic deformation and plastic deformation. Elastic deformation refers to the part of deformation that a metal can fully recover after removing external forces. The elastic deformation is very small, generally not exceeding 0.1% -1.0% of the original length of the material. Plastic deformation refers to the deformation of a material that cannot be restored after external forces are removed.
2） Fatigue fracture
Fatigue fracture refers to the fracture phenomenon of a component that occurs after repeated stress or energy load cycles. About 60% -80% of the fractures that occur during the use of parts belong to fatigue fracture. Its characteristic is that the stress at fracture is lower than the tensile strength or yield limit of the material. Both brittle and plastic materials exhibit brittle fracture with no significant plastic deformation at the macroscopic level during fatigue fracture. The fracture of gear teeth and crankshaft in diesel engines is often the result of fatigue fracture.
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