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曲轴强度分析采用安全系数法不能定量反映出安全可靠程度。由于工作应力和疲劳强度均为随机变量,必须运用概率统计方法进行强度分析,可靠性指标能尽量反映零件安全可靠程度。有限元发展,为内燃机结构强度精确计算提供了条件。本文采用四分之一曲拐有限元模型分析曲拐应力分布,找出危险区域;将应力看成载荷及材料强度函数,运用有限差分法,根据应力—强度干涉理论,借助哥德曼图计算曲轴的可靠度。作者认为在曲轴强度分析中可靠性分析比安全系数法更合理、可靠和接近实际。
Crankshaft strength analysis using the safety factor method can not quantitatively reflect the level of safety and reliability. As the work stress and fatigue strength are random variables, must use the probability statistics method to carry on the strength analysis, the reliability index as far as possible can reflect the parts safe reliable degree. The development of finite element provides the conditions for the accurate calculation of structural strength of internal combustion engine. In this paper, the quarter-crank finite element model is used to analyze the stress distribution of the crank and find out the dangerous area. The stress is regarded as the load and the material strength function. According to the stress-strength interference theory, Crankshaft reliability. The author believes that the reliability analysis of crankshaft strength analysis is more reasonable, reliable and near-real than the safety factor method.