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热机耦合下低速柴油机活塞蠕变-疲劳寿命 史成荫.pdf

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热机耦合下低速柴油机活塞蠕变-疲劳寿命 史成荫.pdf

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热机耦合下低速柴油机活塞蠕变-疲劳寿命 史成荫.pdf

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文档介绍:内 燃 机 学 报
第 卷( )第 期 ( )
40s,a damage accumulation model and life prediction equations were deduced under the simul-
taneous action of high-temperature creep and thermo-mechanical coupling fatigue. The numerical model of the pis-
ton temperature field was developed and verified against experimental results. The temperature field,thermal
stress,thermal deformation and thermo-mechanical coupling stress of the piston under the maximum rate continu-
ous(MRC) operation condition and the overload rate(OR) condition as well as the service life of the piston under
creep-fatigue damage were numerically analyzed. The results show that the gap of the piston temperature field and
thermal load between simulation and measurement is less than 5%. The creep lifetime of the piston under the MRC
is about 46 500 h,and the hazard location is located in the high temperature area near the throat of the piston top
surface. The fatigue life of the piston under the MRC is about 38 400 h,and the hazard area is located at the edge of
the contact surface between the piston and the piston rod. However,in the creep-fatigue damage mode,the service
life of the piston reduces to 21 000 h,54% lower than the pure creep mode and 45% lower than the pure fatigue