美国Dufch Johu地区一条长5450英尺、直径26英寸的管道上进行了一系列的声辐射AE监测技术试验。AE原理塑性材料,诸如钢材,当其受到的应力强度提高,在其有缺陷的部位呈现出塑性扭曲。如果这个应力低于缺陷部位的事故应力,则此部位以伸展、撕裂的方式进行扩张,并以准稳态方式持续下去,直至达到事故应力强度。这时,该材料不能再承受进一步的应力增大及撕裂的发展,从 A series of acoustic AE test techniques were conducted on a 5,450-foot, 26-inch-diameter pipe in Dufch Johu, U.S.A. AE Principle Plastic materials, such as steel, exhibit increased plasticity when exposed to stress and exhibit plastic torsion at their defective locations. If this stress is lower than the accidental stress at the defect site, then the site expands and tears and continues in a quasi-steady state until the accidental stress intensity is reached. At this point, the material can no longer withstand further stress and tear development