• Home
  • About CICEE
  • Editorial Board
  • Publication Ethics
  • 中文

    • Fatigue Strength Analysis Method of Main Bearing Thread Based on A Sub-Model
    DOI：10.13949/j.cnki.nrjgc.2024.01.005
    Key Words:main bearing thread  submodel  factor of safety  fatigue failure  fatigue test
    Author NameAffiliationPostcode
    YUAN Guangming School of Mechanical Engineering， Hebei University of Technology， Tianjin 300400， China 300400
    WANG Quanbiao School of Mechanical Engineering， Hebei University of Technology， Tianjin 300400， China
    Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles， Tianjin 300400， China     		300400
    JING Guoxi School of Mechanical Engineering， Hebei University of Technology， Tianjin 300400， China
    Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles， Tianjin 300400， China     		300400
    WANG Shangzhong School of Mechanical Engineering， Hebei University of Technology， Tianjin 300400， China
    Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles， Tianjin 300400， China     		300400
    WANG Gongcheng Powertrain Engineering Department， Jiangling Motors Co.， Ltd.， Nanchang 330001， China 330001
    ZENG Xiaochun Powertrain Engineering Department， Jiangling Motors Co.， Ltd.， Nanchang 330001， China 330001
    ZHANG Liqiang China North Engine Research Institute， Tianjin 300400， China 300400
    Hits: 1195
    Download times: 627
    Abstract:For the cylinder block main bearing thread fatigue strength analysis and cracking failure problem， a virtual simulation model was established based on the fatigue test of the main bearing wall of cylinder block， and the stress distribution of the main bearing wall was calculated. On this basis， the refined main bearing threaded coupling sub-model was established by re-gridding the cylinder block with the fatigue test results of the main bearing wall. The fatigue strength model of main bearing threads was established based on the critical plane method and Haigh diagram， considering the effects of stress gradient， average stress and surface roughness. And fatigue strength evaluation and failure mechanism analysis were carried out. The results show that the safety factor of the first few buckles of the main bearing thread and bolt coupling gradually increases under the influence of the average stress generated by the bolt preload. The safety factor at the last buckle position is the smallest at 0.8， which matches the cracking position in the test. And the cracking is caused by the simulated gas force dominated stress amplitude which exceeds the material and structural bearing capacity.
    View Full Text  View/Add Comment  Download reader