苑光明,王全彪,景国玺,等.基于子模型的主轴承螺纹疲劳强度分析方法[J].内燃机工程,2024,45(1):37-46.
基于子模型的主轴承螺纹疲劳强度分析方法
Fatigue Strength Analysis Method of Main Bearing Thread Based on A Sub-Model
DOI：10.13949/j.cnki.nrjgc.2024.01.005
关键词:主轴承螺纹  子模型  安全系数  疲劳失效  疲劳试验
Key Words:main bearing thread  submodel  factor of safety  fatigue failure  fatigue test
基金项目:工信部船机重大专项项目（CBG5N21）
作者单位邮编
苑光明 河北工业大学 机械工程学院，天津 300400 300400
王全彪 河北工业大学 机械工程学院，天津 300400
天津市新能源汽车动力传动与安全技术重点实验室，天津 300400 		300400
景国玺 河北工业大学 机械工程学院，天津 300400
天津市新能源汽车动力传动与安全技术重点实验室，天津 300400 		300400
王尚忠 河北工业大学 机械工程学院，天津 300400
天津市新能源汽车动力传动与安全技术重点实验室，天津 300400 		300400
王功成 江铃汽车股份有限公司 动力总成开发部，南昌 330001 330001
曾小春 江铃汽车股份有限公司 动力总成开发部，南昌 330001 330001
张丽强 中国北方发动机研究所，天津 300400 300400
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摘要:针对气缸体主轴承螺纹疲劳强度分析与开裂失效问题，基于气缸体主轴承壁疲劳试验构建了虚拟仿真模型，计算获得主轴承壁的应力分布。在此基础上，结合气缸体主轴承壁疲劳试验结果，重新划分网格建立了精细化的主轴承螺纹联接子模型。综合考虑应力梯度、平均应力和表面粗糙度等因素，基于临界平面法和Haigh图建立了主轴承螺纹疲劳强度模型，进行了疲劳强度评估和失效机理分析。结果表明，主轴承螺纹与螺栓联接前几扣的安全系数在螺栓预紧力产生的平均应力影响下逐渐增大，最后一扣位置处安全系数最小为0.8，与试验中开裂位置基本吻合，其开裂原因为模拟气体力主导的应力幅超出材料和结构承载能力。
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.
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