摘要
利用复合材料的模态柔度曲率矩阵探讨了复合材料构件的无损检测方法。通过模态分析获得脱层复合材料梁的各阶固有频率及节点振型,计算得到模态柔度曲率矩阵判断复合材料梁的脱层损伤。基于梁结构损伤检测理论发展了基于柔度曲率矩阵的复合材料板结构脱层损伤识别理论,即纵向柔度曲率矩阵和横向柔度曲率矩阵。算例分析表明:对于单一脱层损伤,纵向和横向柔度曲率突变率分别是3.6310、5.4078倍。对于多处脱层损伤,小损伤处纵向和横向柔度曲率突变率分别是3.5350、5.902 8倍;大损伤处纵向和横向柔度曲率突变率分别是5.680 3、10.010 9倍。突变位置与预设的脱层位置一致。说明纵向和横向柔度曲率均能判断复合材料脱层损伤的位置和大小,且相对来说,纵向柔度曲率损伤识别效果更好于横向柔度曲率。
In this paper, the modal flexibility curvature matrix FCM of composite was used to discuss the NDT composite materials, the natural frequency of the composite beam and shift values of each node are simulated by modal analysis. The damage of composite beam is detected by calculating the modal flexibility curvature matrix. According to the beam theory we put forward a new theory based on the modal flexibility curvature matrix to detect the damage of composite plate, namely longitudinal and transverse flexibility Curvature matrix. The results show that for a single de- lamination, longitudinal and transverse flexibility curvature mutation rates were 3.6310 and 5. 4078 times respecting. For multiple delamination the longitudinal and transverse flexibility curvature mutation rates were 3. 5350,5. 9028 times at the small damage location. While at the big damage location, the longitudinal and transverse flexibility curva- ture mutation rates were 5. 6803,10. 0109 times. Mtitation position of flexibility curvature mutation coincides with the preset position. So longitudinal and horizontal flexibility curvature can determine the location and size of composite de- lamination, and relatively speaking, longitudinal flexibility curvature works better than transverse flexibility curvature in damage detection.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2015年第5期75-79,共5页
Aerospace Materials & Technology
基金
国家自然科学基金(11372220)
教育部留学回国人员科研启动基金
关键词
复合材料
脱层损伤
模态柔度曲率矩阵
损伤检测
Composite material, Delamination damage, Modal flexibility curvature matrix, Damage detection
