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首页> 外文会议>AD-vol.69; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition; 20041113-19; Anaheim,CA(US) >IN-SITU FABRICATION OF COMPOSITE PIEZOELECTRIC WAFER ACTIVE SENSORS FOR STRUCTURAL HEALTH MONITORING
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IN-SITU FABRICATION OF COMPOSITE PIEZOELECTRIC WAFER ACTIVE SENSORS FOR STRUCTURAL HEALTH MONITORING

机译：用于结构健康监测的复合压电晶片主动传感器的原位制备

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摘要

Structural health monitoring (SHM) is important for reducing maintenance costs while increasing safety and reliability. Traditionally, structural integrity tests required attachment of sensors to the material surface. This is often a burdensome and time-consuming task, especially considering the size and magnitude of the surfaces measured (such as aircraft, bridges, structural supports, etc.). Temporary sensors are a hassle to install; there are some critical applications where they simply cannot accomplish the task required. Piezoelectric wafer active sensors (PWAS) can be permanently attached to the structure and offer a permanent sensor solution. Existing ceramic PWAS, while fairly accurate when attached correctly to the substance, may not provide the long term durability required for SHM. The bonded interface between the PWAS and the structure is often the durability weak link. Better durability may be obtained from a built-in sensor that is incorporated into the material. This paper describes the work on the in-situ fabrication of PWAS using a piezoelectric composite approach. The piezoelectric composite was prepared by mixing small lead zirconate titanate (PZT) particles in an epoxy resin matrix; the mixture was then directly applied onto the surface of a host structure using a designed mask. The curing of the piezo composite was carried out at elevated temperature. After curing, the cured composite was sanded down to the desired thickness. Finally, the piezo composite was poled under a high electric field to activate the piezoelectric effect. The resulting in-situ composite PWAS was utilized as a sensor for dynamic vibration and impact. Characterization of the in-situ composite PWAS on aluminum structure have been recorded and compared with ceramic PWAS before and after polarization. To evaluate the performance of the in-situ composite PWAS, both vibration and impact tests were conducted. In-situ composite PWAS are believed to be a good candidate for reliable low-cost sensor fabrication for SHM.
机译：结构健康监测（SHM）对于降低维护成本同时提高安全性和可靠性非常重要。传统上，结构完整性测试需要将传感器连接到材料表面。这通常是一项繁重且耗时的任务，尤其是考虑到所测量表面（例如飞机，桥梁，结构支撑等）的大小和大小。临时传感器安装麻烦。在某些关键应用程序中，它们根本无法完成所需的任务。压电晶片有源传感器（PWAS）可以永久地附着在结构上，并提供永久的传感器解决方案。现有的陶瓷PWAS，当正确地附着到物质上时相当准确，但可能无法提供SHM所需的长期耐久性。 PWAS与结构之间的键合界面通常是耐用性薄弱环节。从内置在材料中的内置传感器可以获得更好的耐用性。本文介绍了使用压电复合材料方法原位制造PWAS的工作。通过将小的锆钛酸铅（PZT）颗粒混合在环氧树脂基体中来制备压电复合材料。然后使用设计的掩模将混合物直接施加到主体结构的表面上。压电复合材料的固化在高温下进行。固化后，将固化的复合材料打磨至所需厚度。最后，将压电复合材料在高电场下极化以激活压电效应。所得的原位复合材料PWAS被用作动态振动和冲击的传感器。记录了铝结构上原位复合PWAS的表征，并与极化前后的陶瓷PWAS进行了比较。为了评估原位复合PWAS的性能，进行了振动和冲击测试。据信原位复合PWAS是可靠的SHM低成本传感器制造的理想选择。

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