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声发射是物体內部在裂纹扩展、塑性变形或相变过程中产生应力或应变局部再分布而快速释放能量生成的瞬时高频应力波(或称声波)。声波的频率从几赫到几十兆赫。这种局部的应力或应变再分布常常是材料或焊接结构发生破坏的先兆。利用这种发射出来的
Acoustic emission is an instantaneous high-frequency stress wave (or acoustic wave) that is generated when a stress or strain is locally redistributed within an object during crack propagation, plastic deformation or phase change and rapid energy release is generated. The frequency of sound waves from a few hertz to tens of megahertz. This local stress or strain redistribution is often a harbinger of material or weld damage. Use this kind of launch