What are the basic requirements for materials needed to make bearings?
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Factors affecting the size of the metal material fatigue strength
by：Waxing
2020-09-16
Due to fatigue fracture part is usually the weakest part or external defects caused by stress concentration, so the fatigue fracture is sensitive to many factors, for example, the cyclic stress characteristics, environmental medium and temperature, the parts surface state, internal organization defects, etc. , these factors lead to the generation of fatigue crack or the speed of crack propagation and reduce fatigue life.
In order to improve the fatigue strength of parts, prevent the occurrence of fatigue fracture accident, when making mechanical parts design and processing, should choose reasonable structure shape, to prevent surface damage, avoid stress concentration.
Due to the metal surface is the place that is easy to produce fatigue crack, and the actual parts mostly alternating bending or alternating torque load, under the surface where the biggest stress.
Therefore, the surface strengthening treatment has become an effective way to improve the fatigue limit.
Due to the requirement of engineering practice, the research on fatigue work has gradually from the normal fatigue problems under the condition of the fatigue of the extension to the special conditions, such as corrosion fatigue and contact fatigue and high temperature fatigue, thermal fatigue and fretting fatigue wear, etc.
The fatigue and test technology is still in research, and has set up a standardized step by step
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