第44卷第4期2023年8月Vol.44No.4August2023内燃机工程ChineseInternalCombustionEngineEngineeringLa2Zr2O7–8YSZ双陶瓷层热障涂层活塞热–机耦合应力分析林旭1，2，陈为欢3，代鹏2（1.青海民族大学土木与交通工程学院，西宁810007；2.天津大学内燃机燃烧学国家重点实验室，天津300072；3.江铃汽车股份有限公司，南昌330006）ThermalMechanicalCouplingStressAnalysisofAPistonwithLa2Zr2O7–8YSZDoubleCeramicLayerThermalBarrierCoatingsLINXu1，2，CHENWeihuan3，DAIPeng2（1.SchoolofCivilandTransportationEngineering，QinghaiMinzuUniversity，Xining810007，China；2.StateKeyLaboratoryofEngines，TianjinUniversity，Tianjin300072，China；3.JianglingMotorCompany，Nanchang330006，China）Abstract：Takingthepistonofanautomotiveengineastheresearchobject，themodelofapistionwithLa2Zr2O7–8YSZdoubleceramiclayerthermalbarriercoatingswasestablishedbasedonthefiniteelementmethod.Thethermal-mechanicalcouplingbehaviorsoftheceramicsurfacelayer，bottomlayer，substrate，aswellastheinfluenceofdoubleceramiclayeronthepistonwerestudied.Theresultsshowedthatwhenthethicknessofceramicsurfacelayerwas0.15mm，themaximumtemperaturesofLa2Zr2O7–8YSZcoatingpistonsubstrate，ceramicsurfacelayer，andbottomceramiclayerwere271℃，438℃，and363℃，respectively.Withtheincreaseoftheceramicsurfacelayerthickness，thetemperatureofthepistonsubstratedecreasedwhilethetemperatureofthepistontopsurfaceincreased.Themaximumthermalstressoftheuncoatedpistonwas64MPa，whichappearedintheringgroove，whilethemaximumthermalstressofcoatedpistonsubstrateappearedinthetopedgeandthethroatofcombustionchamber.Duetotheeffectsofthemechanicalload，themaximumcouplingstressesofuncoatedpistonandcoatedpistonsubstrateappearedatthepinseat.Themaximumthermalstressesofceramicsurfacelayerandbottomceramiclayerappearedatthebottom.Withtheincreaseoftheceramicsurfacelayerthickness，themaximumcouplingstressesofceramicsurfacelayerandbottomceramiclayerdecreasedslowly，andthecouplingstressofpistonsubstrateremainedconstant.摘要：以某车用发动机活塞为研究对象，基于有限元法建立La2Zr2O7–8YSZ...
