European Workshop on Structural Health Monitoring - EWSHM 2022 - Volume 1
European Workshop on Structural Health Monitoring - EWSHM 2022 - Volume 1
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欧洲结构健康监测研讨会 - EWSM 2022 - 第 1 卷
DOI：
10.1007/978-3-031-07254-3_85
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Myronidis K
中科院分区：
文献类型：
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作者：
Myronidis K
在过去的十年中，自主结构健康监测（SHM）已被广泛引入复合材料结构中，试图主动监测潜在的内部缺陷，但其完整性状态的主动/被动控制仍然是一个挑战。在这项工作中，提出了一种新型的，非牛顿多功能聚合物具有独特的主动/被动能力的冲击保护和SHM的复合材料层合结构。这种基于聚硼硅氧烷（PBS）的聚合物具有独特的剪切依赖性能量吸收特性，由于其聚合物网络内发生相变，被用作铁磁性铁颗粒的支架，从而能够制造玻璃纤维增强聚合物（GFRP）的多功能基质。铁颗粒位于聚合物基体中，该聚合物基体用玻璃纤维增强并用作层压结构的外层。它们的存在使多功能层具有双重功能：首先，在磁场存在下，触发聚合物网络的相变，在冲击的情况下为层压材料提供保护，其次，后冲击允许评估组件的内部完整性，充当主动红外（IR）热成像的嵌入热源。铁颗粒引发相变的能力通过在存在/不存在磁场的情况下的低速冲击来研究，然后通过感应热成像来检查层压板，以评估内部损伤。结果表明，铁颗粒在磁场的存在下，导致增强的保护的复合材料层压板，显着降低的内部损伤的程度。这种新型、低成本的多功能层为复合材料的保护提供了独特的解决方案，解决了其在面外方向上固有的弱电阻问题，并提供了经济实惠的SHM，从而为工程领域需求量很大的智能结构材料开辟了新的前景。
Autonomous Structural Health Monitoring (SHM) has been introduced in composite structures extensively over the last decade in an attempt to proactively monitor potential internal defects, however active/passive control of their integrity status still remains a challenge. In this work, a novel, non-Newtonian multifunctional polymer with unique active/passive capabilities is proposed for impact protection and SHM of composite laminate structures. This Polyboro siloxane(PBS)-based polymer with unique shear-dependant energy absorption characteristics, owed to a phase transition occurrence within its polymeric network, was utilised as scaffold for ferromagnetic iron particles which enabled the manufacturing of the multifunctional matrix for Glass Fibres Reinforced Polymer (GFRP). The iron particles were positioned in the polymer matrix, which was reinforced with glass fibres and employed as outer ply of a laminate structure. Their presence enables a dual functionality of the multifunctional layer: firstly, in the presence of a magnetic field, triggers the phase transition of the polymeric network offering protection to the laminate in case of impacts, and secondly, postimpact allows for the assessment of the internal integrity of the component, acting as an embedded heat source for active Infrared (IR) Thermography. The ability of the iron particles to initiate the phase transition was investigated by means of Low Velocity Impact in the presence/absence of a magnetic field and the laminates were then examined by means of induction thermography, for the evaluation of the internal damage. Results revealed that iron particles in the presence of a magnetic field led to an enhanced protection of the composite laminates, significantly reducing the extent of the internal damage. This novel, low-cost multifunctional layer provides a unique solution for the protection of composite materials, addressing their inherent weak resistance in out-of-plane direction and providing affordable SHM, thus opening new perspectives for smart structural materials which are in great demand in engineering sectors.