南京航空航天大学学报（英文版）2022，Vol.39Issue(3)：314-325,12.
基于飞行时间的复合材料内部缺陷检测新方法
A New Method for Detecting Internal Defects in Composite Materials Based on Time of Flight
摘要
Abstract
Carbon-fiber reinforced polymer composites have been widely used to achieve the light-weighted design and high performance due to superior performance. Internal defects in the composite materials are the main factors that determine their performance,which makes reliable and effective detection methods of internal defects essential. Non-destructive testing(NDT)methods are the most widely-used way due to their tremendous advantages. Though the theoretical background is found, experimental results could be quite complicated and confusing, especially for composite materials with complex defects characteristics. In this paper,experimental study on internal defects in composite materials based on the time of flight(ToF)are investigated. The Gaussian echo model and the parameter estimation methods are established to build a theoretical model for measurements. Then,the distance amplitude correction(DAC)method is proposed to effectively improve the signal-to-noise ratio(SNR)and to reduce distortion of the signal during measurements. Finally,the ToF is adopted to determine depth of internal defects. Experiment study is conducted to investigate the porosity defects and the anti-impact performance of composite materials,as well as defects in objects with various thicknesses. Experimental results show that the proposed method is quite helpful for obtaining the intuition and deep understanding of internal defects,thus contributing to the determination of product performance and its improvement.关键词
超声无损检测/飞行时间/气孔缺陷/抗冲击性能/距离幅度校正方法Key words
ultrasonic non-destructive testing/time of flight/porosity defects/anti-impact performance/distance amplitude correction(DAC)method分类
信息技术与安全科学引用本文复制引用
支凡,张颖,孙建波,罗明,卢鹉..基于飞行时间的复合材料内部缺陷检测新方法[J].南京航空航天大学学报（英文版）,2022,39(3):314-325,12.基金项目
The authors would like to acknowl?edge the following people for their assistance:WU Shihong,WEI Xinhong,CAI Peng and everyone at the China Aero?space Research Institute of Materials&Processing Technol?ogy. （）
