Feasibility Study on Alternative Sensors for Acoustic Emission Damage Detection in Composite Structures

IF 1 Q3 ENGINEERING, MULTIDISCIPLINARY
Noor Ghadarah, David Ayre, Jim Hurley
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引用次数: 0

Abstract

Polyvinylidene Fluoride (PVDF) and Lead Zirconate Titanate (PZT) thin-film sensors can be used to detect acoustic emissions, and their low thickness (28µm PVDF sensors available) allow them to be embedded (positioned within a laminate). However, the characteristics and sensitivity of these sensors within composite structures require further study. The attenuation curves of PZT, silver ink metallised PVDF and gold metallised PVDF sensors, when mounted using a variety of couplants such as ultrasonic gel, resin, silicone adhesive and thin double-sided adhesive tape, have been generated. Investigations also include positioning the sensor within the laminate, as opposed to on the surface, and monitoring the performance changes with respect to the through-thickness position. The sensors coupled using resin have shown to generally have the highest amplitude, with the highest being the PZT yielding 88 dB at 5cm. Initial comparisons of signal detection by the sensors with respect to fibre orientation have shown that signal travelling along the fibres generally has higher amplitude when compared to at 45 o . This research is the first step toward identifying the preferred sensor type and position within the structure for damage detection.
复合材料结构声发射损伤检测替代传感器的可行性研究
聚偏氟乙烯(PVDF)和锆钛酸铅(PZT)薄膜传感器可用于检测声发射,它们的低厚度(28µm PVDF传感器可用)允许它们嵌入(定位在层压板内)。然而,这些传感器在复合材料结构中的特性和灵敏度需要进一步研究。得到了PZT、银墨金属化PVDF和金金属化PVDF传感器在使用超声凝胶、树脂、硅酮胶和双面薄胶带等多种耦合剂安装时的衰减曲线。研究还包括将传感器定位在层压板内,而不是在表面上,并监测与贯穿厚度位置相关的性能变化。使用树脂耦合的传感器通常具有最高的振幅,最高的是PZT在5cm处产生88 dB。传感器对光纤方向的信号检测的初步比较表明,与45度方向相比,沿光纤传播的信号通常具有更高的振幅。这项研究是确定结构中用于损伤检测的首选传感器类型和位置的第一步。
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来源期刊
Advances in Science and Technology-Research Journal
Advances in Science and Technology-Research Journal ENGINEERING, MULTIDISCIPLINARY-
CiteScore
1.60
自引率
27.30%
发文量
152
审稿时长
8 weeks
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