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Fatigue mechanism of metal bellows

Add time: 2019/1/11 9:06:30 Views: 346

Fatigue is that under the action of an alternating load below the static strength limit of a material or component, some local or large areas first enter the yield state, and a high degree of plastic deformation occurs in the local area (usually on the surface of the material or component). Various types of internal defects, such as dislocations, slips, holes, etc., form a certain stress concentration. This kind of local repeated plastic deformation leads to the generation of microcracks after a certain period of time. The microcracks grow, merge, One or more main cracks are formed, and the main cracks gradually expand and eventually break.
In the actual operation process, especially when starting and stopping and changing the working conditions, the stress in the local area near the wave crest or trough of the corrugated pipe exceeds the yield strength of the material and a large range of plastic deformation occurs. When the plastic deformation accumulates to a certain degree, Micro-cracks occur in the local area of the bellows. When the micro-cracks grow, merge, and form one or more main cracks, the bellows may have a low-profile fatigue crack failure. In engineering, the low-cycle fatigue fracture failure of the bellows is mostly caused by Caused by this.

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