论文部分内容阅读
一、概述疲劳是一门由一些传统学科,例如金属物理学,统计学和动力学等综合而成的学科,已有一百多年的历史,由于疲劳破坏机理至今尚不清楚,工程师们历来都把实验看作是疲劳研究必不可少的环节。室内模拟疲劳试验可分为规则加载和随机加载二类,见图1。以往一些常规的疲劳试验均属规则加载,但是由于工程实际中大多数构件所承受的工作载荷一般不是等幅的,其危险点的应力一时间历程往往是一个比较复杂的随机过程。目前一般的处理方法是对在构件危险点
I. Overview Fatigue is a discipline composed of some traditional disciplines, such as metal physics, statistics and dynamics. It has been more than one hundred years. Due to the fact that fatigue failure mechanism is still unclear, engineers have traditionally Think of experiments as an essential part of fatigue research. Indoor simulation fatigue test can be divided into regular loading and random loading two categories, see Figure 1. In the past, some conventional fatigue tests were all regular loads. However, since most of the components in engineering practice are not subjected to the same working load, the stress-time history of the dangerous points is often a rather complicated random process. The current general approach is at the point of danger in the component