摘要
重点介绍了超声波测量螺栓应力的原理和方法,指出该测量方法存在的挑战并提出研究新思路.利用压电材料的特性,在螺栓的头部粘接一层压电陶瓷,制成压电传感式螺栓;通过用一种集超声波发射接收器、信号采集装置及分析处理系统于一体的小型便携式超声波测试仪,产生高压电脉冲加到压电陶瓷上,使其产生超声波;超声波在螺栓中传播,返回信号由采集接收装置接收并被分析处理,并将当前螺栓的应力状态在屏幕上反映出来.这种方法,可避免耦合层的不均匀性带来的测量误差,实现应力、预紧力的高精度测量和控制.
This paper focuses on the principle and methods of ultrasonic measurement of bolt axial stress. Challenges and new thoughts for research on this technique are also pointed out. A piezoelectricity sensing-typed bolt with a layer of piezoelectric ceramic on its head is made to produce a small portable ultrasonic tester characterized by the system of ultrasonic transmitting and receiving devices, signal acquisition devices and analytical processing. Ultrasonic will be generated after the piezoelectric layer is stimulated by high-voltage pulses from the transmitting device of the tester. The return signal in the bolt will be received, analyzed and processed by receiving device. Meanwhile, the current stress state of the bolt will be reflected on the screen. This approach can avoid some errors caused by coupling layer non-uniformity and achieve high-accuracy control of stress and preload of bolts.
出处
《南通大学学报（自然科学版）》
CAS
2009年第3期67-71,共5页
Journal of Nantong University(Natural Science Edition)
基金
南通大学自然科学基金项目(07Z037)
南通大学研究生科技创新项目(YKC08009)
关键词
螺栓
轴向应力
测量
超声波
bolt
axial stress
measurement
ultrasonic
作者简介
作者简介：李光（1984-），男，硕士研究生。
通讯联系人：吴努（1957-），男，教授，主要从事机械设计及理论、纺织机械等方面的研究．E—mail：wu.n@ntu．edu．cn
