Lamb wave propagation in Z-pin reinforced co-cured composite pi-joints
Lamb wave propagation in Z-pin reinforced co-cured composite pi-joints
复制标题
DOI：
10.1117/12.848787
复制
发表时间：
2010-03
期刊：
影响因子：
--
通讯作者：
E. Swenson;S. Soni;Hitesh Kapoor
中科院分区：
文献类型：
--
作者：
E. Swenson;S. Soni;Hitesh Kapoor
本文提出了一个初步的研究兰姆波传播特性的z-销增强，共固化复合材料π-节点的结构健康监测（SHM）的目的。设计并制造了π接头试验件，以复制在典型飞机机翼结构中发现的共固化的全复合材料蒙皮-翼梁接头。由于π-关节表现出各种复杂的损伤模式，如果要开发SHM系统来监测这些类型的关节的潜在损伤，则需要进行正式的研究。实验在未损坏（健康）和损坏的测试物品上进行，其中使用一个锆钛酸铅（PZT）传感器激发兰姆波。使用三维（3D）扫描激光多普勒振动计（LDV）来收集面内和面外速度测量的高密度扫描。在受损的供试品中，可以清楚地看到分层、基体开裂和纤维断裂，基本反对称A0和对称S 0兰姆波模式的变化都很明显。在两种供试品中，狭窄的几何形状、因连接网而导致的不连续性和厚度对兰姆波传播有可检测的影响。从传播通过未损坏和损坏的测试物品之间的兰姆波的比较，很明显，可以检测到损坏使用z针增强，共固化复合材料π接头的这种情况下的广泛损坏的兰姆波。
This paper presents an initial study on Lamb wave propagation characteristics in z-pin reinforced, co-cured composite pi-joints for the purposes of structural health monitoring (SHM). Pi-joint test articles were designed and created to replicate a co-cured, all composite skin-spar joint found within a typical aircraft wing structure. Because pi-joints exhibit various complex damage modes, formal studies are required if SHM systems are to be developed to monitor these types of joints for potential damage. Experiments were conducted on a undamaged (healthy) and damaged test articles where Lamb waves were excited using one lead zirconate titanate (PZT) transducer. A three-dimensional (3D) scanning laser Doppler vibrometer (LDV) was used to collect high-density scans of both the in-plane and out-of-plane velocity measurements. In the damaged test article, where delamination, matrix cracking, and fiber breakage can clearly be seen, changes in both the fundamental antisymmetric A0 and symmetric S0 Lamb wave modes are apparent. In both test articles, the effects of narrow geometry, discontinuity due to the attachment of the web, and thickness has detectable effects on Lamb wave propagation. From the comparisons between Lamb waves propagating through the undamaged and damaged test articles, it is clear that damage can be detected using Lamb waves in z-pin reinforced, co-cured composite pi-joints for this case of extensive damage.