摘要
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。
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 defectslocated 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.
出处
《南昌航空大学学报（自然科学版）》
CAS
2015年第3期70-75,97,共7页
Journal of Nanchang Hangkong University(Natural Sciences)
基金
国家自然科学基金(51265044
11374134)
江西省自然科学基金(20114BAB202008)
关键词
周向导波
厚壁管道
角束导波探头
缺陷检测
ultrasonic circumferential guided waves
thick-walled pipe
angle beam guided wave probe
detection of defect
