一、前言大型船用柴油机气缸盖、活塞头等燃烧室零部件,曾经发生一系列疲劳破损事故。为此,开展了疲劳强度的研究,改进了设计和制造方法,从而使这种疲劳破损事故逐渐减少。但是,还不能完全防止事故发生。其原因之一是这些零部件在实际工作环境中,存在着重叠疲劳强度问题。 First, the foreword Large marine diesel engine cylinder head, piston first combustion chamber components, there have been a series of fatigue damage accident. To this end, fatigue strength has been carried out to improve the design and manufacturing methods, so that the fatigue damage reduction gradually reduced. However, the accident can not be completely prevented. One of the reasons is that there are overlapping fatigue strength problems of these components in the actual working environment.