Real-time detection of low-velocity impact-induced delamination onset in composite laminates for efficient management of structural health
Real-time detection of low-velocity impact-induced delamination onset in composite laminates for efficient management of structural health
复制标题
DOI：
10.1016/j.compositesb.2017.05.019
复制
发表时间：
2017-08-15
影响因子：
13.1
通讯作者：
Kim, Chun-Gon
中科院分区：
文献类型：
--
作者：
Jang, Byeong-Wook;Kim, Chun-Gon
碳纤维增强复合材料(CFRP)层合板由于具有较高的比强度和比刚度，已成为航空航天工业的主要结构。然而，CFRP层合板对低速冲击事件很敏感，容易导致内部或隐藏的损伤，如分层。这种影响经常发生在维护、飞行操作或服务中的事件中。因此，复合材料结构除了要进行定期维护外，还必须进行不定期的检测，以确保结构的健康。然而，这种不定期的检查本身就会产生总体维护成本，因为在所有可疑的损坏情况下都必须进行这种检查。因此，为了降低复合材料结构的运行成本，需要一种能够准确地实现低速冲击事件引起的脱层起始的方法。本文研究了利用高速光纤布拉格光栅(FBG)传感系统检测厚CFRP层合板脱层的可能性。由于FBG传感器可以简单地被多路复用来捕获结构响应，因此本研究中提出的方法对于高效的碰撞监测系统是非常有吸引力的。为了获得冲击响应信号和接触力历史，在1-30J范围内进行了多次低速冲击实验，通过对这些实验数据的信号处理，利用小波变换后的传感器信号的细节分量，引入了有意义的损伤指数。虽然这一结果还处于初步阶段，但该损伤指标可用于在不久的将来将现场冲击损伤评估系统应用于真实的复合材料结构。(C)2017爱思唯尔有限公司。保留所有权利。
Carbon fiber reinforced polymer (CFRP) laminates have been becoming primary structures in the aerospace industry because of their high specific strength and stiffness. However, CFRP laminates have susceptibility to low-velocity impact events which can easily induce internal or hidden damages such as delamination. Such impacts frequently arise during maintenance, flight operation or in-service events. Thus, composite structures have to be irregularly inspected in addition to the periodic maintenance for ensuring the structural health. However, such irregular inspections can inherently incur the overall maintenance cost because it has to be performed in all suspicious cases of damages. For this reason, the methodology for accurately realizing the onset of delamination induced by low-velocity impact events is required for reducing the operating cost of composite structures. In this paper, the potential of using high speed fiber Bragg grating (FBG) sensing system for detecting the delamination onset was studied for thick CFRP laminates. Because FBG sensors can be simply multiplexed to capture the structural responses, the proposed method in this study can be quite attractive for an efficient impact monitoring system. To obtain the impact response signals and contact force histories, several low-velocity impact experiments were performed in a range of 1-30 J. From the signal processing of these experimental data, the meaningful damage index was introduced using the detail components of wavelet transformed sensor signals. Although this result is in the preliminary step, such damage index can be useful for applying an in-situ impact damage assessment system to the real composite structures in the near future. (C) 2017 Elsevier Ltd. All rights reserved.