Prediction of Fatigue Life for Diesel Engine Piston Based on Transient Analysis
HE Panpan
,
LIU Jianmin
,
WANG Pukai
,
LIU Yanbin
,
KANG Qi
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(1.Department of Mechanical Engineering,Academy of Armored Force Engineering,Beijing 100072,China;2.Department of Training,Academy of Armored Force Engineering,Beijing 100072,China)
Taking the piston of turbocharged diesel engine as the research object, the FEA model of crank and connecting rod mechanism and cylinder assembly was built and the stress distribution of piston was calculated under thermal load，mechanical load and thermal and mechanical coupling load. Then the thermal and mechanical coupled stress field was used as fatigue load and the fatigue life of piston was computed according to nominal stress approach. The results show that the short life region was the upper part inside piston pin boss. In this area, the minimum cycle is 8.823×107 or around 1 470.5 h.Accordingly, the structure of piston is reasonable and can meet the application requirements of diesel engine.
