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《Diesel Engine》 2019-06
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Cracking Failure Analysis of the Exhaust Bypass Bellows on Marine Gas Engines

Jin Yushan;Wang Zhiyong;Zhang Lijun;Wang Ming;Li Xiang;Shanghai Marine Diesel Engine Research Institute;Harbin Engineering University;  
The bellows of a gas marine engine behind the exhaust bypass valve cracked many times during the endurance test of 300 h.In order to find out the cracking causes,physical and chemical analysis of materials, compensate value inspection, and simulation calculation of stress were carried out. The results showed that excessive stress at crest and trough caused by assembly deviation, thermal expansion exceeding the upper limit,and long-term vibration may lead to small flaws and then result in fatigue cracking. Improvement methods are offered based on the research.
【CateGory Index】: U672
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