摘要
气门的颈部是杆部与盘部的过渡区域,也是应力集中的区域,结构不合理导致应力集中程度严重,促进疲劳源的产生,是疲劳断裂的主要原因之一。本文从优化气门颈部结构入手,利用有限元软件Abaqus对气门进行了热-应力耦合分析,对颈部应力集中程度和颈部结构对应力分布的影响进行了探究。利用SolidWorks对进气门的过渡锥角β和过渡圆弧半径R在允许范围内进行调整,再把新的模型导入到Abaqus进行分析,以最大应力最小,应力分布均匀为目标进行优化,研究了β和R对最大应力及应力分布的影响。由此得出:β=21°,R=21mm为最优结构,即过渡锥角为21°,过渡圆角半径为21mm。
the neck of the valve is not only the transition zone of the stem and the disc,but also the stress concentrated area.The irrational structure will lead serious stress concentration,promoting the generation of fatigue source,which is one of the main reasons for the fatigue fracture.Start with optimizing the structure of the intake valve’s neck,by using the finite element software-Abaqus to analyze the valve thermal-stress coupling and to optimize the structure of the valve.We obtained the stress distribution,and found the position of stress concentration.Then,we changed the cone Angle beta and transition arc radius R changes of the valve by Solid-works,and then imported them into the Abaqus to perform an analysis.In order to find the minimum of maximum stress and make the stress distribute uniformly,we studied the influence of beta and R to maximum stress and stress distribution.Integrating the results of analyzing the indicators for valve axial maximum stress and the maximum stress of valve plate,it can be found whenβ=21°,R=21 mm is the best structure for the inlet valve.
作者
胡巍
Hu Wei(Hunan Financial&Industrial Vocational-Technical College,Hengyang 421001,China;Hunan Agricultural University College,Changsha 410000,China)
出处
《内燃机与配件》
2022年第12期41-43,共3页
Internal Combustion Engine & Parts
基金
2020年湖南省教育厅科学研究项目,柴油机进气门断裂失效分析及结构优化(20C0314)。
关键词
应力集中
疲劳断裂
耦合
最优结构
Stress concentration
Fatigue fracture
Coupling
Best structure
