Influence of crack size and shape parameters on acoustic emission signal propagation in concrete,to study the influence of different cracks on acoustic emission wave propagation characteristics,further study on the location correction model of damage signals with different crack shapes.Acoustic emission test of concrete specimen based on different shape cracks.The effects of crack angle,crack distance from acoustic emission source,crack number and crack depth on acoustic emission wave propagation characteristics are studied.Research shows that damage degree of acoustic emission signal propagation by different cracks,the distance of the crack from the acoustic emission source and the angle of crack have great damage to acoustic emission signal,and the maximum damage is 66.44%and 48.43%,the damage of crack number and crack depth is relatively small,and the maximum damage is 38.00%and 24.71%;Based on the influence law of different morphological cracks,the modified wave velocity relationship model considering the influence of different morphological cracks is established,compared with the traditional time difference positioning method,the modified wave velocity positioning method based on different crack shapes is more accurate for acoustic emission source positioning.
关键词
混凝土/声发射/波速/裂纹形态/修正波速/时差定位法
Key words
concrete/acoustic emission/wave velocity/crack morphology/correction of wave velocity/time of arrival location
万方数据