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疲劳破断经常在远低于材料的强度极限和屈服极限,甚至在低于弹性极限的情况下发生.这种破断对于零件复杂的表面状况十分敏感,且是一种很难防范的偶发性破坏.它对于高速运转的机件,是一种很大的潜在威胁.据统计,疲劳破断约占所有破断事故的90%.因此,探索疲劳破坏的原因及影响因素,设法增强材料和机件的疲劳抗力,是当前面临的迫切而重大的工程问题. 确认疲劳破断是低周性质还是高周性质,对于掌握破断的原因,制定改进的措施具有实际意义. 对于疲劳破断样件的周次定量分析,主要是通过电子显微镜实现.这方面工作,已经有过许多报导和介绍.本文仅介绍英国ROLLS-ROYCE公司在电镜复型工作上的定位技术和疲劳条带的定量计算方法.以供参考.
Fatigue breakage often occurs well below the material’s strength and yield limits, even below the elastic limit, a breakage that is very sensitive to the complex surface conditions of the part and is a form of accidental damage that is difficult to prevent. It is a great potential threat to high-speed mechanical parts.According to statistics, fatigue fracture accounts for about 90% of all broken accidents.Therefore, to explore the causes of fatigue failure and its influencing factors, try to enhance the fatigue of materials and mechanical parts Resistance is the urgent and major engineering problem currently facing.It is of practical significance to establish the low-cycle or high-cycle fatigue test to make the improvement measures.For the weekly quantitative analysis of the fatigue fracture samples, Mainly through the electron microscope.This work has been reported and introduced.This paper describes only the ROLLS-ROYCE company in the work of electron microscopy of the positioning technology and fatigue banding quantitative calculation method for reference.