The Establishment of Fatigue Life Model of Gery Cast Iron Cylinder Heads Based on Mechanical Fatigue Tests
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- 英文论文题名：The Establishment of Fatigue Life Model of Gery Cast Iron Cylinder Heads Based on Mechanical Fatigue Tests
- 论文作者：Wang Hui ; Cheng Ying
- 英文论文作者：Wang Hui ; Cheng Ying ; School of Mechanical Engineering ; Beijing Institute of Technology
- 年：2016
- 作者机构：School of Mechanical Engineering,Beijing Institute of Technology;
- 英文论文关键词：cylinder head ; grey cast iron ; life model ; mechanical fatigue tests
- 会议召开时间：2016-10-26
- 会议录名称：2016中国汽车工程学会年会论文集
- 英文会议录名称：Proceedings of 2016 SAE-China Congress
- 语种：英文
- 分类号：U467.2
- 学会代码：QCGC
- 会议名称：2016中国汽车工程学会年会暨展览会
- 会议地点：中国上海
- 主办单位：中国汽车工程学会
- 学会名称：中国汽车工程学会
- 页数：6
- 文件大小：813k
- 原文格式：O
- 会议级别：全国
摘要
Fatigue is the main failure mode of engine' s complicated components like cylinder heads.Hence,an accurate life model would help direct anti-fatigue methods.However,because cylinder heads undergo complex thermal and mechanical loadings,it would be very difficult to conduct tests which can completely simulate the thermo-mechanical fatigue condition.In this study,in order to evaluate the fatigue time of cylinder heads with high efficiency,since cylinder heads' lifetimes are decided by the low cycle fatigue areas on its fire deck,this critical location should be highlighted.A near-components-shaped specimen "valve bridge sample" were designed and then tested on a one-way pull-press fatigue machine.By comparing the measured fatigue lifetimes from tests to the calculated ones from four life prediction formulas,a preferable formula was selected to establish the original lifetime model.Then,taking into account that material related parameters like yield limit would decrease under high temperature,the original lifetime model was corrected by adopting the temperature factor "t".Finally,the availability and accuracy of the life model were validated.
Fatigue is the main failure mode of engine' s complicated components like cylinder heads.Hence,an accurate life model would help direct anti-fatigue methods.However,because cylinder heads undergo complex thermal and mechanical loadings,it would be very difficult to conduct tests which can completely simulate the thermo-mechanical fatigue condition.In this study,in order to evaluate the fatigue time of cylinder heads with high efficiency,since cylinder heads' lifetimes are decided by the low cycle fatigue areas on its fire deck,this critical location should be highlighted.A near-components-shaped specimen "valve bridge sample" were designed and then tested on a one-way pull-press fatigue machine.By comparing the measured fatigue lifetimes from tests to the calculated ones from four life prediction formulas,a preferable formula was selected to establish the original lifetime model.Then,taking into account that material related parameters like yield limit would decrease under high temperature,the original lifetime model was corrected by adopting the temperature factor "t".Finally,the availability and accuracy of the life model were validated.
Fatigue is the main failure mode of engine' s complicated components like cylinder heads.Hence,an accurate life model would help direct anti-fatigue methods.However,because cylinder heads undergo complex thermal and mechanical loadings,it would be very difficult to conduct tests which can completely simulate the thermo-mechanical fatigue condition.In this study,in order to evaluate the fatigue time of cylinder heads with high efficiency,since cylinder heads' lifetimes are decided by the low cycle fatigue areas on its fire deck,this critical location should be highlighted.A near-components-shaped specimen "valve bridge sample" were designed and then tested on a one-way pull-press fatigue machine.By comparing the measured fatigue lifetimes from tests to the calculated ones from four life prediction formulas,a preferable formula was selected to establish the original lifetime model.Then,taking into account that material related parameters like yield limit would decrease under high temperature,the original lifetime model was corrected by adopting the temperature factor "t".Finally,the availability and accuracy of the life model were validated.
引文
[1]Stefan Trampert,Taner Gocmez,Stefan Pischinger.Thermo Mechanical Fatigue Life Prediction of Cylinder Heads in Combustion Engines[J].Journal of Engineering for Gas Turbines and Power,2008,130(1).
[2]Vladimir Ogarevic,Bruce Whittle,Xiaobin Lin et al.Thermal Fatigue of Automotive Components[J].Society of Automotive Engineers,2001-01-0829.
[3]Tsuyoshi Takahashi,Katsuhiko Sasaki.Low Cycle Thermal Fatigue of Aluminum Alloy Cylinder Head in Consideration of Changing Metrology Microdtructure[J].Procedia Engineering 2010(2):767-776.
[4]F Szmyrka,P Michaud,L Remy,et al.Thermo-mechanical Fatigue Resistance Characterization and Materials Ranking from heat-flux-controlled Tests.Application to cast-irons for automotive exhaust part[J].International Journal of Fatigue,2013,55(1):136-146.
[5]E Charkaluk,A Constantinescu.An Energetic Approach in Thermomechanical Fatigue for Silicon Molybdenum Cast Iron[J].Materials at High Temperatures,2000,17(3):373-380.
[6]F Zieher,F Langmayr,A Jelatancev et al.Thermal Mechanical Fatigue Simulation of Cast Iron Cylinder Heads[J].SAE International,2005,25(7):641-645.
[7]Taner Gocmez,Ali Awarke.A New Low Cycle Fatigue Criterion for Isothermal and out of Phase Thermomechanicalloading[J].International Journal of fatigue,2010:769-779.
[8]Cao Lianbo,Cheng Ying.Heavy Duty Diesel Engine Cylinder Head Design Against Fatigue[J].CHAIYOUJI.ISSN 1001-4357,2013.
[2]Vladimir Ogarevic,Bruce Whittle,Xiaobin Lin et al.Thermal Fatigue of Automotive Components[J].Society of Automotive Engineers,2001-01-0829.
[3]Tsuyoshi Takahashi,Katsuhiko Sasaki.Low Cycle Thermal Fatigue of Aluminum Alloy Cylinder Head in Consideration of Changing Metrology Microdtructure[J].Procedia Engineering 2010(2):767-776.
[4]F Szmyrka,P Michaud,L Remy,et al.Thermo-mechanical Fatigue Resistance Characterization and Materials Ranking from heat-flux-controlled Tests.Application to cast-irons for automotive exhaust part[J].International Journal of Fatigue,2013,55(1):136-146.
[5]E Charkaluk,A Constantinescu.An Energetic Approach in Thermomechanical Fatigue for Silicon Molybdenum Cast Iron[J].Materials at High Temperatures,2000,17(3):373-380.
[6]F Zieher,F Langmayr,A Jelatancev et al.Thermal Mechanical Fatigue Simulation of Cast Iron Cylinder Heads[J].SAE International,2005,25(7):641-645.
[7]Taner Gocmez,Ali Awarke.A New Low Cycle Fatigue Criterion for Isothermal and out of Phase Thermomechanicalloading[J].International Journal of fatigue,2010:769-779.
[8]Cao Lianbo,Cheng Ying.Heavy Duty Diesel Engine Cylinder Head Design Against Fatigue[J].CHAIYOUJI.ISSN 1001-4357,2013.