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厚壁管道在特种承压设备领域中广泛使用,常规无损检测技术难以实现其快速有效地检测。本文采用数值模拟与实验相结合来研究周向导波快速检测厚壁管道的方法。首先,利用有限差分软件研究了不同角度激励下外径269mm、壁厚32mm的厚壁管道中周向导波的传播特性,优化了探头激励角度范围;然后分别制作了55°和45°的斜楔,并搭建了实验系统,研究了周向导波与厚壁管道壁厚方向不同位置缺陷的相互作用规律。研究结果表明,周向导波适用于厚壁管道快速检测。检测时需选择角度适中的探头。激发角度过小时,厚壁管中形成的周向导波模式较多,使得波包宽度较大,影响检测分辨率;而角度过大时,会使得盲区增大,导致靠近内壁区域缺陷漏检。本文的研究结论为厚壁管道缺陷周向导波的实际检测应用提供了指导。
Thick-walled pipe is widely used in the field of special pressure-bearing equipment, so conventional non-destructive testing technology can not detect it quickly and effectively. In this paper, the combination of numerical simulation and experiments to study the rapid detection of circumferential wall wave guide method of thick-walled pipelines. Firstly, using the finite difference software, the propagation characteristics of circumferential guided waves in thick-walled pipes with outer diameter of 269mm and wall thickness of 32mm under different excitation angles were studied, and the range of excitation angle of the probe was optimized. Then the wedges of 55 ° and 45 ° , And an experimental system was set up to study the interaction between circumferential guided waves and different locations of wall thickness in thick-walled pipe. The results show that the circumferential guided wave is suitable for the rapid detection of thick-walled pipes. Detection should choose the right angle probe. When the excitation angle is too small, the circumferential guided wave patterns formed in the thick-walled tube are more, which makes the wave packet width larger, which affects the detection resolution. When the angle is too large, the blind area will increase, resulting in missing inspection near the inner wall. The conclusions of this paper provide guidance for the practical application of circumferential guided wave in thick-walled pipe defects.