摘要
材料早期性能退化阶段的损伤形式以微裂纹为主,微裂纹与超声的非线性作用能够表征材料的损伤情况。根据经典微裂纹非线性弹簧模型,从理论上分析裂纹参数对非线性系数的影响,建立不同裂纹参数的铝合金板三维模型,使用高频Lamb波进行数值仿真,研究长度、宽度和角度与非线性系数的关系,结果表明非线性系数随裂纹长度增加而增加,随裂纹宽度变宽而减小。在Lamb波传播方向与垂直方向布置三个接收探头,三个接收探头的非线性系数随角度增加而变化,因此通过三点的非线性系数值可以判断裂纹的角度。这一研究工作对后续使用高频Lamb波定量检测微裂纹角度具有重要意义。
The damages formed in the early stage of degradation are mainly micro-cracks,and the nonlinear effect between micro-cracks and ultrasound can characterize the damage of materials.In this paper,the influence of the crack parameters on the nonlinear coefficient is analyzed theoretically based on the classical microcrack nonlinear spring model.Then,three-dimensional models of aluminum alloy plates with different crack parameters are established.High-frequency Lamb waves are used for numerical simulations to study the relationships between nonlinear coefficients and the length,width and angle.The experimental results show that as the length of the crack increases,the nonlinear coefficient increases;the width of the crack increases,and the nonlinear coefficient decreases;when three receiving probes are arranged in the Lamb wave propagation direction and the vertical directions,the three-point nonlinear coefficient changes with the angle.The angle of the crack can be roughly judged by the three-point nonlinear coefficient value.The research work is of great significance for the subsequent use of high-frequency Lamb waves to quantitatively detect the angle of micro-cracks.
作者
詹湘琳
孙李明恒
Zhan Xianglin;Sun Limingheng(College of Electronic Informa tion and Automation,Civil Aviation University of China,Tianjin 300300,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2021年第17期345-354,共10页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61102097)。
关键词
材料
金属材料
非线性超声
LAMB波
损伤评价
material
metallic material
nonlinear ultrasonic
Lamb wave
damage assessment
