一、前言 声发射是新型的动态无损检测技术。材料、结构件由于外力作用或内部受力,其内部存在的缺陷会由相对静止状态转化为明显的运动状态,同时释放出弹性能以应力波方式传递。根据应力波的特性分析判断缺陷的特点、状态和发展趋势。声发射无损检测技术可提供物体受力时缺陷活动的信息,因此厚壁管疲劳裂纹试验中采用声发射监测技 First, the preface Acoustic emission is a new type of dynamic nondestructive testing technology. Due to the external force or the internal force, the internal defects of the material and the structure will transform from the relatively static state to the obvious motion state, and at the same time release the elastic energy to be transmitted by the stress wave. According to the characteristics of stress wave analysis to determine the characteristics of defects, status and development trends. Acoustic emission non-destructive testing technology to provide information on the movement of objects under stress, so thick-walled tube fatigue crack test using acoustic emission monitoring technology