Research on An Inspection Method for De-bond Defects in Aluminum Skin-Honeycomb Core Sandwich Structure with Guided Waves
In order to increase the ultrasonic inspection speed of skin honeycomb core sandwich structure, the application of guided waves in this field was researched on. The characteristics of guided waves was stated, the propagation of guided waves in the skin honeycomb core sandwich structure was analyzed. Guided wave mode was selected in term of signal amplitude relative change dependent on the wave structure theory. Through short time frequency transform time frequency analysis, the frequency change of signal due to defects was researched. Best line scan distance was determined based on the signal in different position. It is testified that A0 mode has a better sensitivity on de-bond defect. The de-bond defect can be inspected through the comparison of amplitude. Although some of energy would leak into the core, the guided waves can travel over longer distance which results that the guide wave line scan has quicker inspection speed.
Skin-honeycomb core sandwich structure Guided waves Wave structure Time-frequency analysis
Fangcheng HE Zhenggan ZHOU Zhanying FENG
Department of NDT, Beijing Institute of Aeronautical Materials,Beijing 100095, P. R. China2. School School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Department of Handling Facilities, Academy of Military Transportation, Tianjin 300161, P. R. China
国际会议
第十七届世界无损检测会议(17th World Conference on Nondestructive Testing)
上海
英文
1134-1141
2008-10-25（万方平台首次上网日期，不代表论文的发表时间）