Fatigue failure is the main failure mode for the machinery parts and engineering structures under alternate loading over a long period of time 对于那些长期经受交变载荷作用的机械零件和工程构件，疲劳破坏是一种主要的破坏模式。
Fatigue failure in the power plant boiler drum and pressure piping is the common failure , which caused by fatigue loading and others 锅炉承压部件(汽包等)及压力管道在交变载荷和其它因素作用下发生疲劳破坏是一种常见的失效方式。
The result indicates that the dynamic stress caused by hydraulic pulse at partial load is one of the important reason of the fatigue and cracks of the runner 结果表明由于水压力脉动引起的转轮叶片上的振动交变动应力是混流式水轮机疲劳破坏的主要原因之一。
Destroy of fatigue is universal in modem industry . though people have paid great attention to the problem of fatigue , there are many accidents recently 疲劳破坏在现代工业中是十分普遍的，尽管人们对疲劳问题已引起重视，但是，近年来疲劳事故仍然不断发生。
Vibration will be disadvantage not only to the normal work of a structure , but also to the life span of the structure or even destroy the instrument within it 振动不仅会影响结构的正常工作，还将使结构产生过早的疲劳破坏、减少使用寿命，或导致结构中仪器的损坏。
The theory of probabilistic fracture mechanics is presented . then the general rule and influential factors of cracks propagation occurred in fatigue failure are discussed 介绍了概率断裂力学的理论基础，及疲劳破坏过程中裂纹扩展的一般规律，以及影响疲劳裂纹扩展的因素。
The design method of fatigue is usually established by way of fatigue tests home and abroad . a few of studies on its fatigue mechanism and life estimation are proceeded presently 目前国内外对其疲劳性能的研究大多借助疲劳试验以建立其验算方法，而对疲劳破坏机理及疲劳寿命估算研究甚少。
In chapter 2 , the fatigue mechanism of automobile half shaft is studied ; and intensified coefficient model based on fatigue failure theory and programmed load spectrum technology is also provided 第二章研究汽车驱动桥半轴疲劳破坏机理，在零件疲劳损伤理论和程序载荷谱处理技术基础之上给出路面强化系数模型。
The response of pavement has fast attenuation about the loading point , because of the damp . at last , this paper utilizes the analytic solution to backcalculate the foundation parameter 这一点对解释道面材料的疲劳破坏、材料的松散都有着重要的意义：由于地基模型中考虑了阻尼的影响，使得弯沉在加载点附近的衰减加快。
Not all of the damages belong to the fatigue damage mode supposed by exist specifications . as the bearing capacity of a pavement structure is limited , excessive load may damage the pavement structure at one action 这些破坏不完全是现行规范所假定的疲劳破坏模式,由于路面结构的承载能力有限,过大的轴载一次作用就可能造成路面结构的破坏。
