Nondestructive testing method based on lamb waves for localization and extent of damage  

作　　者：Jianlin Chen Zheng Li Kezhuang Gong 

机构地区：[1]State Key Laboratory of Turbulence and Complex System,College of Engineering,Peking University

出　　处：《Acta Mechanica Solida Sinica》2017年第1期65-74,共10页固体力学学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Nos.11172003 and 11521202)

摘　　要：Based on Lamb wave analysis of propagation in plate-like structures, a damage detection method is proposed that not only locates the position of the damage accurately but also estimates its size. Similar damage detection methods focus only on localization giving no quantitative estimation of extent. To improve detection, we propose two predictive circle methods for size estimation. Numerical simulations and experiments were performed for an aluminum plate with a hole. Two PZT configurations of different sizes were designed to excite and detect Lamb waves. From cross-correlation analysis, the damage location and extent can be determined. Results show that the proposed method enables a better quantitative resolution in detection, the size of the inspection area influences the accuracy of damage identification, and the closer is the inspected area to the damage, the more accurate are the results. The method proposed can be developed into a multiple-step detection method for multi-scale analysis with prospective accuracy.Based on Lamb wave analysis of propagation in plate-like structures, a damage detection method is proposed that not only locates the position of the damage accurately but also estimates its size. Similar damage detection methods focus only on localization giving no quantitative estimation of extent. To improve detection, we propose two predictive circle methods for size estimation. Numerical simulations and experiments were performed for an aluminum plate with a hole. Two PZT configurations of different sizes were designed to excite and detect Lamb waves. From cross-correlation analysis, the damage location and extent can be determined. Results show that the proposed method enables a better quantitative resolution in detection, the size of the inspection area influences the accuracy of damage identification, and the closer is the inspected area to the damage, the more accurate are the results. The method proposed can be developed into a multiple-step detection method for multi-scale analysis with prospective accuracy.

关 键 词：Lamb wave Damage detection Cross correlation PZT wafer Aluminum plate 

分 类 号：TG115.28[金属学及工艺—物理冶金]