CAJ | 학술논문

厚壁管道在石化、核电领域有着非常广泛的应用,厚壁管道损伤的快速检测评价技术倍受国内外学者的重视. 以外径269 mm、壁厚32 mm厚壁管道为研究对象,利用Disperse软件数值计算了其周向Lamb波的频散曲线. 为了全壁厚范围检测缺陷,制作了相应的包含外壁、中部和内壁3个缺陷的厚壁管道试块. 实验设计采用角束导波探头检测壁厚方向上不同位置的缺陷,根据频散曲线选取0. 5 MHz的激励频率,进行了不同楔块入射角度下周向导波检测厚壁管道缺陷的实验研究.实验结果表明:楔块入射角度为55°时,外壁和中部缺陷都能检测出,其中对外壁缺陷的检测灵敏度最高,而对内壁缺陷难以检测;采用45°和37°时可以检测出外壁、中部和内壁3个不同位置缺陷,其中37°时检测内壁缺陷效果最好.
후벽관도재석화、핵전영역유착비상엄범적응용,후벽관도손상적쾌속검측평개기술배수국내외학자적중시. 이외경269 mm、벽후32 mm후벽관도위연구대상,이용Disperse연건수치계산료기주향Lamb파적빈산곡선. 위료전벽후범위검측결함,제작료상응적포함외벽、중부화내벽3개결함적후벽관도시괴. 실험설계채용각속도파탐두검측벽후방향상불동위치적결함,근거빈산곡선선취0. 5 MHz적격려빈솔,진행료불동설괴입사각도하주향도파검측후벽관도결함적실험연구.실험결과표명:설괴입사각도위55°시,외벽화중부결함도능검측출,기중대외벽결함적검측령민도최고,이대내벽결함난이검측;채용45°화37°시가이검측출외벽、중부화내벽3개불동위치결함,기중37°시검측내벽결함효과최호.
Thick-walled pipes have been widely used in the field of petrochemical and nuclear power and its rapid detection evaluation technique has received extensive attention of the domestic and international scholars. As to the thick-walled pipe which outside diameter is 269 mm and its wall thickness is 32 mm, the dispersion curves of circumferential Lamb wave were calculated by the Disperse software. In order to detect defects of different thickness, three different artificial defects which were located in outer wall, middle thick wall and inner wall separately were made. According to the dispersion curve, 0. 5 MHz excitation frequency was selected, the experimental research of thick-walled pipe' s defect detection was carried by using circumferential guided waves with different wedge incident angle in this paper. The experimental result shows that when the wedge incident angle was 55 °, the defects located in outer wall and middle thick wall could be detected and the detection sensitivity of external wall defect was the highest, but the defect located in the internal wall was difficult to detect;when the wedge angle was 37 ° or 45 °, the defects located in outer wall, middle thick and inner wall could be detected, and the detection result of inner wall defects with angle of 37 ° is the best.