Characterizing Mechanical Properties of Hybrid Alumina Carbon Fiber Composites with Piezospectroscopy
Characterizing Mechanical Properties of Hybrid Alumina Carbon Fiber Composites with Piezospectroscopy
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DOI：
10.2514/6.2016-1413
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发表时间：
2016-01
期刊：
影响因子：
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通讯作者：
I. Hanhan;A. Selimov;D. Carolan;A. Taylor;S. Raghavan
中科院分区：
文献类型：
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作者：
I. Hanhan;A. Selimov;D. Carolan;A. Taylor;S. Raghavan
碳纤维复合材料由于其重量轻、强度高、性能好等优点，在航空航天结构和应用中得到了广泛的应用。最近，科学家们已经开始研究包括纤维和颗粒填料的混合复合材料，因为它们允许先进的机械性能定制，例如提高疲劳寿命。该项目研究了一种混合碳纤维增强聚合物（HCFRP），包括碳纤维和额外的氧化铝纳米颗粒填料，作为嵌入式纳米应力传感器。利用压电光谱效应，嵌入的纳米颗粒的光致发光（PL）光谱信号已被监测，因为它与应力的变化，使非接触式应力检测的材料。HCRFPs的应力敏感性能进行了研究，在原位使用激光源和拉伸力学测试系统。研究了具有不同质量含量的氧化铝纳米颗粒的混杂复合材料，以确定颗粒含量对材料整体应力传感性能的影响。此外，高分辨率的光致发光地图收集从每个试样的表面，以确定不同的氧化铝含量的试样的颗粒分散。分散图也可作为量化微粒沉降的方法，并有助于改进制造工艺。结果表明，发射的光致发光光谱确实可以从嵌入的氧化铝纳米颗粒捕获，并表现出一个系统的趋势，在光致发光峰位移相对于应力，达到一定的临界应力。因此，在这项工作中所示的非接触应力传感结果具有很强的影响，多功能混杂复合材料的发展，以支持结构健康监测和无损评价（NDE）的航空航天结构。
Carbon fiber composites have become popular in aerospace structures and applications due to their light weight, high strength, and high performance. Recently, scientists have begun investigating hybrid composites that include fibers and particulate fillers, since they allow for advanced tailoring of mechanical properties, such as improved fatigue life. This project investigated a hybrid carbon fiber reinforced polymer (HCFRP) that includes carbon fiber and additional alumina nanoparticle fillers, which act as embedded nano stresssensors. Utilizing the piezospectroscopic e↵ect, the photo-luminescent (PL) spectral signal of the embedded nanoparticles has been monitored as it changes with stress, enabling noncontact stress detection of the material. The HCRFPs stress-sensitive properties have been investigated in-situ using a laser source and a tensile mechanical testing system. Hybrid composites with varying mass contents of alumina nanoparticles have been studied in order to determine the e↵ect of particle content on the overall stress sensing properties of the material. Additionally, high resolution photo-luminescent maps were collected from the surfaces of each specimen in order to determine the particulate dispersion of specimens with varying alumina content. The dispersion maps also served as a method of quantifying particulate sedimentation, and can aid in the improvement of the manufacturing process. The results showed that the emitted photo-luminescent spectrum can indeed be captured from the embedded alumina nanoparticles, and exhibits a systematic trend in photo-luminescent peak shift with respect to stress, up to a certain critical stress. Therefore, the non-contact stress sensing results shown in this work have strong implications for the development of multi-functional hybrid composites to support structural health monitoring and nondestructive evaluation (NDE) of aerospace structures.