摘要
针对空气耦合Lamb波,采用了一种与信号速度无关的概率损伤成像方法,对玻璃纤维复合材料板(Glass Fiber Reinforced Polymer,简称“GFRP”)中存在的不同缺陷进行了成像研究。首先使用空气耦合探头在GFRP板的同侧激励和接收单一模态Lamb波,并将探头沿着两个正交的方向进行扫查。然后使用矩形窗截取每个扫查路径上接收信号的直达Lamb波,并对其进行快速傅里叶变换(FFT)。得到其频域能量后,定义其与参考信号频域能量的相对差异为能量损伤因子。最后将各扫查路径的能量损伤因子结合概率损伤算法,对不同类型的缺陷进行成像,并与空气耦合C扫查成像结果进行对比。实验结果显示,基于空气耦合Lamb波的概率损伤成像方法能够有效地对GFRP板中存在的不同损伤进行定位和定量。
Aiming at the Air-coupled ultrasonic Lamb wave,a probability imaging method independent of signal velocity was used to study the multiple types of defects in Glass Fiber Reinforced Plate(GFRP).Firstly,the single mode Lamb waves are excited and received on the same side of the GFRP with an air-coupled probe,and the probe is scanned in two orthogonal directions.Then,we intercept the direct defect signal received by each scanning path and carry out Fast Fourier Transform(FFT).After obtaining the energy in the frequency domain,the relative difference between the energy in the frequency domain and the reference signal is defined as the energy damage factor.Finally,the energy damage factors of each scanning path were combined with the probability damage principle to conduct imaging of different types of defects,and the imaging results were compared with the results of air-coupled C-Scan.The results show that the imaging method based on the air-coupled Lamb wave can effectively localize and quantify multiple types of defects in GFRP.
作者
常俊杰
万陶磊
吴俊
曾雪峰
李媛媛
CHANG Jun-jie;WAN Tao-lei;WU Jun;ZENG Xue-feng(Key Lab of Nondestructive Testing,Ministry of Education,Nanchang Hangkong University,Nanchang 330063,China;Yangtze Delta Region Institute of Tsinghua University.Zhejiang,Zhejiang 314000,China;Japan Probe Co.,Ltd.,Japan Yokohama 232-0033,Japan)
出处
《复合材料科学与工程》
CAS
北大核心
2020年第4期46-52,共7页
Composites Science and Engineering
基金
国家自然科学基金项目(11464030)。
