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    • Thermal Mechanical Coupling Stress Analysis of A Piston with La2Zr2O7–8YSZ Double Ceramic Layer Thermal Barrier Coatings
    DOI：10.13949/j.cnki.nrjgc.2023.04.013
    Key Words:piston  double ceramic layer structure  temperature field  thermal stress  coupling stress
    Author NameAffiliationE-mail
    LIN Xu* School of Civil and Transportation Engineering， Qinghai Minzu University， Xining 810007， China
    State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China     		linxuaaa@126.com 
    CHEN Weihuan Jiangling Motor Company， Nanchang 330006， China wchen10@jmc.com.cn 
    DAI Peng State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China dai_peng@tju.edu.cn 
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    Abstract:Taking the piston of an automotive engine as the research object， the model of a pistion with La2Zr2O7–8YSZ double ceramic layer thermal barrier coatings was established based on the finite element method. The thermal-mechanical coupling behaviors of the ceramic surface layer， bottom layer， substrate， as well as the influence of double ceramic layer on the piston were studied. The results showed that when the thickness of ceramic surface layer was 0.15 mm， the maximum temperatures of La2Zr2O7–8YSZ coating piston substrate， ceramic surface layer， and bottom ceramic layer were 271 ℃， 438 ℃， and 363 ℃， respectively. With the increase of the ceramic surface layer thickness， the temperature of the piston substrate decreased while the temperature of the piston top surface increased. The maximum thermal stress of the uncoated piston was 64 MPa， which appeared in the ring groove， while the maximum thermal stress of coated piston substrate appeared in the top edge and the throat of combustion chamber. Due to the effects of the mechanical load， the maximum coupling stresses of uncoated piston and coated piston substrate appeared at the pin seat. The maximum thermal stresses of ceramic surface layer and bottom ceramic layer appeared at the bottom. With the increase of the ceramic surface layer thickness， the maximum coupling stresses of ceramic surface layer and bottom ceramic layer decreased slowly， and the coupling stress of piston substrate remained constant.
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