摘要
为了利用激光超声技术检测样品表面裂纹深度,本文基于有限元分析软件(COMSOL)的热-固耦合物理场,建立激光超声无损检测模型,进行了不同深度裂纹的检测仿真,在此基础上根据超声波在金属中的传播规律推导出裂纹深度定量计算公式并用实验进行计算裂纹深度,得出计算公式具有较高的正确性。结果表明:随着裂纹深度的增加,裂纹底端反射横波SR也随之增加,两者成线性关系;本文所提出的裂纹深度定量公式具有较高的正确性,裂纹深度定量相对误差不超过7%。
In order to use laser ultrasonic technology to detect the surface crack depth of the sample,a laser ultrasonic non-destructive testing model was established based on the thermal-solid coupled physical field of the finite element analysis software(COMSOL),and cracks of different depths were simulated.Based on this,the quantitative calculation formula of crack depth was deduced according to the propagation law of ultrasonic waves in metal and the crack depth was calculated by experiments.The calculation formula was highly accurate.The results show that as the crack depth increases,the reflected shear wave SR at the bottom of the crack also increases,and the two have a linear relationship.The quantitative formula for crack depth proposed in this paper has higher accuracy,and the relative quantitative error of crack depth does not exceed 7%.
作者
唐又红
左欧阳
武美萍
Tang Youhong;Zuo Ouyang;Wu Meiping(Jiangsu Entry-Exit Inspection and Quarantine Administration,Suzhou,Jiangsu215004,China;School of Mechanical Engineering,Jiangnan University,Wuxi,Jiangsu214122,China)
出处
《应用激光》
CSCD
北大核心
2020年第6期1144-1152,共9页
Applied Laser
基金
南京海关科技计划项目资助(项目编号:2018KJ04)
关键词
无损检测
COMSOL
数值模拟
表面缺陷
nondestructive testing
COMSOL
numerical simulation
surface defects
