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首页> 外文会议>3rd International Workshop on Structural Health Monitoring, Sep 12-14, 2001, Stanford University >Investigation of Self-Monitoring and Self-Healing Bolted Joints
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Investigation of Self-Monitoring and Self-Healing Bolted Joints

机译：自我监测和自愈螺栓连接的研究

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摘要

The bolted joint is of great importance in structures. Its loosening mode of failure is a mode common in the failure of structures. This paper is a report of an initial investigation into the real-time condition monitoring and active control of bolted-joints in civil structures and components. The impedance-based health monitoring technique, which utilizes the electromechanical coupling property of piezoelectric materials, has been used to detect and identify bolt-connection damage. When damage occurs, temporary adjustments of the bolt tension can be achieved actively and remotely using shape memory alloy actuators in order to restore lost torque for continued operation. Specifically, the actuator is a cylindrical Nitinol washer that expands axially when heated, according to the shape memory effect. The washer is actuated in response to a decrease in torque. Upon actuation, the stress generated by its axial strain compresses the bolted members and creates a frictional force that has the effect of generating a preload. The structure in question was monitored in all stages of testing using piezoelectric impedance analysis. Through experimentation, we have documented a successful actuation of the shape memory element. Due to complexity of constitutive modeling, qualitative analysis by the impedance method is used to illustrate the success. Additional considerations encountered in this initial investigation are made to guide further thorough research required for the successful commercial application of this promising technique.
机译：螺栓连接在结构中非常重要。它的松动失效模式是结构失效中常见的一种模式。本文是对土木结构和零部件中螺栓连接的实时状态监测和主动控制的初步调查的报告。利用压电材料的机电耦合特性的基于阻抗的健康监测技术已被用于检测和识别螺栓连接损坏。当发生损坏时，可以使用形状记忆合金执行器主动地和远程地实现螺栓张力的临时调节，以恢复损失的扭矩以继续运行。具体地，致动器是圆柱形的镍钛诺垫圈，其根据形状记忆效应在加热时轴向膨胀。响应于扭矩的减小来致动垫圈。在致动时，由其轴向应变产生的应力会压缩螺栓构件并产生摩擦力，从而产生预紧力。使用压电阻抗分析在所有测试阶段都对所讨论的结构进行了监控。通过实验，我们记录了形状记忆元件的成功驱动。由于本构模型的复杂性，使用阻抗法进行定性分析可证明成功。在此初步研究中遇到的其他考虑因素，是为了指导对该有希望的技术的成功商业应用进行进一步深入的研究。

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