摘要
利用声发射技术对玻璃纤维/环氧树脂复合材料悬臂梁的振动性能进行研究.采集悬臂梁自由振动下的声发射(AE)信号,并对信号进行快速傅里叶变换(FFT)和频谱分析.结果表明:复合材料声发射延续时间长,其主频率为108.5Hz、阻尼系数为0.113.这一结果同电阻应变传感系统测得的梁的实际振频110.1Hz、阻尼系数0.119非常接近,说明该方法用于复合材料固有频率测试时精确度高;而且同应变传感系统相比,能够反映复合材料的微观变化,对研究其振动损伤有重要意义.
The acoustic emission （AE）technique is adopted to analyze the vibration performance of interlock structured glass fabric/epoxy composite. The vibration signals from a free vibrated cantilever beam are carried on Fast Fourier Transformation and spectrum analysis. The results show that： AE can last for a long time,and its main frequency is 108.5 Hz and damping coefficient is 0.113. Compared to the resistant-strain method＇s 110.1 Hz and 0.119, AE technic is accurate in composite＇s free vibration test; moreover, AE technique can reflect changes in composite＇s mirco-structure, which is of great value for the research of composite vibration damages.
出处
《天津工业大学学报》
CAS
2008年第6期1-3,共3页
Journal of Tiangong University
基金
天津市教委重点资助项目(ZD200720)
关键词
声发射技术
复合材料
振动性能
acoustic emission technique
composite
vibration properties
