摘要
针对小口径金属圆柱内部不同角度缺陷的检测,通过有限元方法对铝圆柱中横波的传播特性进行研究。通过横波方向性的研究确定横波的能量范围,在横波的主要能量范围设置内部不同角度的人工矩形缺陷,通过B-scan的方法对PRS波(与缺陷作用的一次反射横波)的传播特性进行研究。通过对PRS波出现的扫查角度范围进行统计研究,确定PRS波的最佳探测角β(扫查角度范围内PRS波幅值最大的扫查角度)。根据扫查角度范围内最大幅值PRS波的到达时间与缺陷角度α关系对α角进行了反演,α角为30°时误差最大,误差为0.025,其他缺陷角度下误差均小于0.02。利用PRS波的扫查角度范围和最佳探测角β完成不同α角下PRS波的可视化,提出一种通过提取能量点评估α角的方法。以上研究结果为激光超声检测柱状材料内部缺陷提供了一定的参考。
In this paper,the propagation characteristics of s-wave in aluminum.cylinder are studied by finite element method for the detection of different Angle defects in small diameter metal cylinder.The energy range of s-wave was determined by the study of s-wave directivity,and the artificial rectangular defects with different angles were set in the main energy range of Swave.The propagation characteristics of PRS wave(the primary reflected s-wave interacting with the defects)were studied by B-scan method.Based on the statistical study of the range of scanning Angle of PRS wave,the optimal detection Angleβ(the scanning Angle with the maximum amplitude of PRS wave within the range of scanning Angle)was determined.According to the relationship between the arrival time of the largest PRS wave and the defect Angle a,the error of a Angle was O0.025 when the Angle was 30°,and the error of other defect angles was less than 0.02.This paper visualizes PRS waves at differentαangles by using the range of scanning angles and the optimal detection Angleβ,and proposes a method to evaluate theαAngle by extracting energy points.The above research results provide a certain degree of reference value for laser ultrasonic detection of internal defects of cylindrical materials.
作者
贺旭文
郭华玲
郑宾
刘辉
崔缙
贾庸斌
He Xuwen;Guo Hualing;Zheng Bin;Liu Hui;Cui Jin;Jia Yongbin(School of Electrical and Control Engineering,North University of China,Taiyuan 030051,Shanri,China)
出处
《应用激光》
CSCD
北大核心
2023年第8期122-130,共9页
Applied Laser
基金
信息探测与处理重点实验室基金(ISPT2020-6)。
关键词
激光超声
横波
柱状材料
内部缺陷
角度
数值模拟
slaser ultrasonic
transverse wave
columnar material
internal defect
angle
numerical simulation
