琼·迪尔·沃特洛拖拉机厂制造的六缸柴油机的锻造曲轴,为了满足增压的需要,最近对其结构设计进行丁改进,把轴颈的过渡圆角增大了。为了预测改进后曲轴在使用过程中的破坏几率,进行了曲轴工作应力的测量和弯曲疲劳试验,根据试验结果确定使用破坏几率,与使用调查的数据比较符合。现将试验过程与数据处理的情况介绍如下。 The forged crankshaft of the six-cylinder diesel engine manufactured by the Joan Deere Waterloo Tractor Factory recently improved its structural design and increased the fillet of the journal in order to meet the need of pressurization. In order to predict the damage probability of the improved crankshaft during operation, the working stress of the crankshaft and the bending fatigue test were carried out. According to the test results, the probability of damage was determined, which was in good agreement with the data from the survey. Now the test process and data processing are described below.