发动机排气门失效仿真分析

文章基于国内外对汽车发动机气门失效的研究现状，从工况方面出发，分析了导致气门失效的主要考虑因素，并根据气门的工况特征，采用有限元法进行了排气门在燃烧载荷、冲击载荷、温度载荷情况下及气门偏心异常条件下气门应力分布的研究，最后基于应力进行了气门的疲劳分析。结果表明，异常情况下，气门和气门座交接面处应力异常增大，疲劳损坏对气门的寿命影响很大，有可能是造成本次失效的主要原因。通过分析，也可为气门的失效分析和气门的优化设计提供理论依据。

Simulation Analysis of Engine Exhaust Valve Failure

Based on the research achievements of engine valve at home and abroad,from the aspects of working cycle mode,the mail factors considered are analyzed,which led to valve failure.And based on the mode characteristic of valve,valve stress distribution is studied by using finite-element method in the burning load,impact load,temperature load and abnormity of valve off center.Finally the fatigue analysis is proceeded on the basis of stress.The results show that the stress of the interface between the valve and v...