一、概述声发射是材料状态改变时,以弹性波的形式释放能量的一种过程。这里材料状态的改变包括如温度,内部相结构,应力状态,裂纹的产生与发展等等。所谓声发射技术,就是从材料的表面探测这样以弹性波形式释放出的能量,以推断材料内部状态改变的技术。由于材料在形变和裂过程中,往往要伴随产生大量的声发射,因此,人们尤其注意 First, an overview of Acoustic emission is the state of the material changes, in the form of elastic waves to release energy in a process. The material state changes here include temperature, internal phase structure, stress state, the generation and development of cracks and so on. The so-called acoustic emission technology, that is, from the surface of the material to detect such energy released in the form of elastic waves to infer the state of material changes in the internal state of the technology. Due to the material in the deformation and cracking process, often accompanied by a large number of acoustic emission, so people pay particular attention