Comparative study on the performance of high temperature piezoelectric materials for structural health monitoring using ultrasonic guided waves
Comparative study on the performance of high temperature piezoelectric materials for structural health monitoring using ultrasonic guided waves
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发表时间：
2019
影响因子：
0.9
通讯作者：
A. Dhutti;S. Tumin;T. Gan;J. Kanfoud;W. Balachandran
中科院分区：
文献类型：
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作者：
A. Dhutti;S. Tumin;T. Gan;J. Kanfoud;W. Balachandran
能源、航空航天、石油和天然气行业专注于优化维护计划的预测性维护，正在寻求能够对其关键资产进行在役结构健康监测 (SHM) 的技术。许多关键资产（例如涡轮发动机部件和蒸汽管道）在高温下运行。对于此类高温（HT）应用，需要先进的压电材料来构造超声波换能器。超声波导波 (UGW) 技术已广泛用于管道检测，但需要使用 HT 超声波换能器来实现蒸汽管道的运行 SHM。 HTUGW 换能器设计的主要标准是在目标温度下具有适当的、温度稳定的超声波响应和稳定的频率响应（对于 2-48 英寸直径的管道，范围为 10-150 kHz），以保持 HT 下的缺陷灵敏度。这些换能器包含适当极化和尺寸的压电材料，当用电输入激励时，将所需的位移模式传输到被监测结构中的 UGW 模式。缺陷的检测通过接收到的超声波测量值的变化来指示。随着温度的变化和时间的推移，活性材料的介电、弹性和压电特性可能会发生变化，导致超声波响应出现偏差，从而可能导致误报。这项比较研究调查并比较了四种商用高温压电材料的性能：PZT-5A、MBT、LiNbO3 和 GaPO4。这些选定材料长期使用的最高建议工作温度分别为 200°C、400°C、600°C 和 720°C。代表压电传感器品质因数的弹性、介电和材料特性是在温度升高至 600°C 并持续 1000 小时的情况下确定的。这项工作的结果将使传感器设计能够使用最适合目标温度范围的压电材料。
Focusing on predictive maintenance for optimised maintenance schedules, energy, aerospace, oil and gas industries are seeking technologies to enable in-service structural health monitoring (SHM) of their critical assets. Many of these critical assets such as turbine engine components and steamlines operate at elevated temperatures. For such high temperature (HT) applications, advanced piezoelectric materials are required for construction of ultrasonic transducers. Ultrasonic guided wave (UGW) technology has been widely used for pipeline inspection but HT ultrasonic transducers are required to enable in-service SHM of steamlines. The main criterion for HTUGW transducer design is an appropriate, temperature-stable ultrasonic response at target temperatures and a stable frequency response (in the range10-150 kHz for pipes of 2-48 inch diameter) to maintain defect sensitivity at HT. These transducers comprise piezoelectric materials of appropriate polarisation and dimensions, which, when excited with an electrical input, transmit the desired displacement patterns to the UGW modes in the structure being monitored. The detection of defects is indicated by changes in the received ultrasonic measurements. With temperature variations and over time, the dielectric, elastic and piezoelectric properties of the active material can diverge, leading to deviations in the ultrasonic response that may lead to false alarms. This comparative study investigates and compares the performance of four commercially available HT piezoelectric materials: PZT-5A, MBT, LiNbO3 and GaPO4. The maximum recommended operating temperatures for long-term use of these selected materials are 200°C, 400°C, 600°C and 720°C, respectively. Elastic, dielectric and material properties representing a figure of merit for piezo transducers are determined at increasing temperatures up to 600°C and over a period of 1000 hours. The findings from this work will enable transducer design to use the most appropriate piezoelectric material for the target temperature range.