Fatigue Life Analysis and Structural Parameter Optimization of Metal Bellows in Automotive Exhaust System based on Finite Element Model
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Abstract
To optimize the structure of automotive metal exhaust bellows and improve its fatigue life, a finite element model was used to analyze and optimize the structure of bellows. A cumulative damage theory can analyze bellow’s fatigue life. The results show that the bending stress of corrugated pipe increases with wall thickness and wave diameter increasing. It decreases with wave distance with an increase in wave height. When the wall thickness is 0.35mm, the bending stress of the corrugated pipe is 90MPa. When the wave diameter is 2.6, the bending stress of the corrugated pipe is 61MPa. When the wave distance is 7.0mm, the bending stress of the corrugated pipe is 48MPa. When the wave height is 12.5mm, the bending stress of the corrugated pipe is 40MPa. After optimizing the corrugated pipe structure, the corrugated pipe’s fatigue life has been improved. Before optimization, the corrugated pipe experienced fatigue damage at the second trough, with a fatigue life of 7.793*105. After optimization, the corrugated pipe experienced bleeding fatigue damage at the third trough, with a fatigue life of 8.888*105. Research has optimized the structure of exhaust bellows and improved bellow’s fatigue life.
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