Study of Equivalent and Influence Laws of Accelerated Thermal Fatigue Life of Aluminum Alloy Pistons in Highly StrengthenedDiesel Engines

doi:10.12382/bgxb.2021.0651

Abstract

Abstract: To solve the problem of predicting the thermal fatigue life of pistons in highly strengthened diesel engines under real conditions, an accelerated thermal fatigue method is proposed to predict the service life of pistons. The critical life method is used to calculate the cycle life of pistons under real working conditions and bench conditions. Piston accelerated thermal fatigue tests are carried out to verify the simulated life data, and the simulation data is in good agreement with the test results. Through damage equivalent analysis, the relationship between piston life under real working conditions and bench life is determined. The correlation between cycle life, loading time and maximum temperature under bench conditions is obtained by nonlinear fitting. Under real working conditions and bench test conditions, the simulation results indicate that the first spot where fatigue failure occurs is the throat area. The failure areas of the two are consistent. When the maximum temperature of piston throat is 408.6 ℃, the service life of piston under real machine calibration condition is 21.2 times that under bench condition. Under the condition of piston bench, when the maximum temperature is the same, the piston life decreases with the decrease of heating time. When the heating time is the same, the piston life decreases with the increase of the maximum temperature. According to the fitted correlation, the activation energy of piston failure is 61.5 kJ/mol.

Key words: realmachinecondition, benchcondition, lifeequivalence, acceleratedthermalfatiguetest

CLC Number:

TK422

JI Yameng, ZHANG Weizheng, YUAN Yanpeng, LU Hongyu, GUO Jinbao, XU Yunqing. Study of Equivalent and Influence Laws of Accelerated Thermal Fatigue Life of Aluminum Alloy Pistons in Highly StrengthenedDiesel Engines[J]. Acta Armamentarii, 2022, 43(12): 3008-3019.

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