Hybrid structural health monitoring on a composite plate manufactured with automatic fibers placement including embedded fiber Bragg gratings and bonded piezoelectric patches
Hybrid structural health monitoring on a composite plate manufactured with automatic fibers placement including embedded fiber Bragg gratings and bonded piezoelectric patches
复制标题
对采用自动纤维放置制造的复合板进行混合结构健康监测，包括嵌入式光纤布拉格光栅和粘合压电贴片
DOI：
10.1117/12.2516537
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
V. Memmolo
中科院分区：
文献类型：
--
作者：
N. D. Boffa;E. Monaco;F. Ricci;L. Lecce;M. Barile;V. Memmolo
复合材料结构健康监测通常采用二次粘贴或埋入式传感器。每种类型的传感器在单独使用时都有优点和缺点，尽管它们的适当集成组合可以提高SHM系统的整体性能。本工作的目的是评估一个有效的混合SHM系统的可行性，能够感测和定位低速的影响，并在其早期阶段与几个传感器本地化最终的冲击损伤。NOVOTECH srl通过先进的高压釜外制造工艺制造了一个带有嵌入式FBG的CFRP面板演示器，该工艺基于以下主要阶段：用激光辅助自动纤维铺放机器人（AFP）铺设干燥预制件;根据设计要求将FBG网络插入预制件堆叠中;高温液体树脂灌注工艺。然后将盘形压电片（PZT）二次粘结到面板上。首先，启用碰撞感测模式，诉诸PZT和FBG作为接收器，从碰撞位置收集应变波。一种独立于材料的技术，它既不需要材料属性的先验知识，即使是各向异性板，也不需要密集的传感器阵列，将用于定位的影响。为了在撞击定位之后评估面板的完整性，然后使用最有效的传感器执行损坏定位模式，其中由于在先前提到的撞击感测模式中执行的撞击位置的知识，这些传感器的选择是可能的。损伤定位技术是基于由PZT产生的导波和PZT和FBG两者感测。再次，由于碰撞位置的知识，减少数量的PZT被选择来执行损伤定位。所提出的技术的主要优点是能够感测的影响事件，并激活损伤定位模式，只有在需要时。此外，通过知道撞击位置，仅需要使用几个传感器（源和接收器），有利于减少所需的采集通道和待管理的采集数据的数量。
Secondary bonded or embedded sensors are usually adopted in Structural Health Monitoring of composite structures. Each type of sensor has advantages and drawbacks when used separately although their proper integrated combination may improve the overall performance of a SHM system. The aim of the present work is to evaluate the feasibility of an efficient hybrid SHM system able to sense and locate low velocity impacts and to localize eventual impact damages at their early stage with few sensors. A CFRP panel demonstrator with embedded FBGs has been fabricated by NOVOTECH srl through an advanced out-of-autoclave manufacturing process based on the following main phases: production of dry preforms laid down with a laser assisted automated fiber placement robot (AFP); insertion of the FBGs network within the stack of the preform according to the design requirements; high temperature liquid resin infusion process. Disk shaped piezo patches (PZT) are then secondary bonded to the panel. First, an impact sensing mode is enabled resorting to both PZTs and FBGs as receivers, gathering strain waves from the impact location. A material independent technique, that needs neither a priori knowledge of the material properties even for anisotropic plates nor a dense array of sensors, will be used to locate the impact. To assess the integrity of the panel after impact localization, the damage location mode is then performed using the most effective sensors, where the selection of these sensors is possible thanks to the knowledge of the impact location carried out in the previous mentioned impact sensing mode. The damage localization technique is based on guided waves generated by PZTs and sensed by both PZTs and FBGs. Again, thanks to the knowledge of the impact location, a reduced number of PZTs is selected to perform the damage localization. The main advantage of the proposed technique is the capability to sense impact events and to activate the damage localization mode only when required. Moreover, by the knowledge of the impact location, only a few sensors (sources and receivers) need to be used in favor a reduced number of acquisition channels required and acquisition data to be managed.