激光超声检测技术在复合材料检测中的应用

Application of Laser Ultrasonic Testing Technique on the Detection of Composite Structures

针对广泛用于航天器结构的复合材料层压板,建立了激光超声检测实验平台,实验研究了脉冲激光在复合材料中产生超声波的时频域特征,分析了激光超声与复合材料分层缺陷相互作用的声衰减行为,实现了复合材料层压板夹杂、分层缺陷的C型成像检测.研究成果对推动激光超声检测技术在航天飞行器结构快速检测中的应用与发展具有积极作用.

According to the composite laminates which are widely used in spacecraft structures, a laser ultra- sonic experimental platform has been built, the time and frequency features of laser generated ultrasonic waves in composite materials have been studied, the attenuation characteristics induced by the interaction of laser ultrasonic waves with inclusions and delaminations in composite materials have been analyzed. The laser ultrasonic imaging of the internal defects in composite laminates is realized. These research results have a positive effect on the application and development of laser ultrasonic testing technique in the field of spacecraft testing.