CAJ | 학술논문

基于 L(0,2)模态超声导波分析管道裂纹损伤的回波特征。首先,基于 ANSYS 软件,通过删除单元的方法建立金属管道的裂纹缺陷的有限元模型；用脉冲–回波的方法模拟 L(0,2)模态波对管道进行激励。其次,对得到的管道裂纹时程曲线进行分析,提取缺陷回波时间、反射系数等特征参数,通过对比模拟的裂纹轴向定位与实际裂纹位置,验证了管道裂纹模型的有效性；对裂纹轴向长度、周向角度、径向深度和裂纹截面积与反射系数的关系进行分析,得出结论：裂纹的轴向定位可以由裂纹回波到达的时间和波速确定,利用时域分析方法,定位误差不超过5%；裂缝径向深度和周向角度增加时,反射系数变大；当径向深度与周向角度同比例增加时,径向深度对裂纹反射的影响更大；裂纹截面积增大时,反射系数增大。
기우 L(0,2)모태초성도파분석관도렬문손상적회파특정。수선,기우 ANSYS 연건,통과산제단원적방법건립금속관도적렬문결함적유한원모형；용맥충–회파적방법모의 L(0,2)모태파대관도진행격려。기차,대득도적관도렬문시정곡선진행분석,제취결함회파시간、반사계수등특정삼수,통과대비모의적렬문축향정위여실제렬문위치,험증료관도렬문모형적유효성；대렬문축향장도、주향각도、경향심도화렬문절면적여반사계수적관계진행분석,득출결론：렬문적축향정위가이유렬문회파도체적시간화파속학정,이용시역분석방법,정위오차불초과5%；렬봉경향심도화주향각도증가시,반사계수변대；당경향심도여주향각도동비례증가시,경향심도대렬문반사적영향경대；렬문절면적증대시,반사계수증대。
Based on L(0,2)ultrasonic guided wave,this paper analyzes echo characteristic of pipeline crack damage.First-ly,on the basis of ANSYS software and by means of canceling some cells,finite element model for crack defect of the metal pipeline was established,in addition,pulse-echo method was used for simulating L(0,2)module wave to inspire the pipe-line.Secondly,time travel curve of pipeline crack was analyzed for extracting characteristic parameters such as defect echo-ing time,reflection coefficient and so on.By comparing and simulating axial location and practical position of crack,effec-tiveness of this crack model was verified.By analyzing relationships between axial length,circumferential angle,radial depth and sectional area of the crack and reflection coefficient,it was concluded that axial location of the crack could be de-termined by echo arrival time and wave speed ,by using time domain analysis method,location error was less than 5%.In addition,when radial depth and circumferential angle increased,reflection coefficient largened.When radial depth and cir-cumferential angle increased at the same rate,affect of radial depth on crack reflection was greater.When sectional area in-creased,reflection coefficient increased as well.