Research of Threaded Connection In-Situ Preload Measurement

Bolt connection in-situ measurement refers to the field measurement of bolt preload without changing the original bolt connection state. At present, the technologies that can be applied to bolt connection in-situ measurement mainly include piezoelectric impedance method, acoustic emission method, ultrasonic method, optical fiber sensing method, etc. This paper summarizes the research status of these measurement methods, analyzes their measurement principle, key technologies, advantages and disadvantages and scope of application, and finally gives the development trend of threaded connection in-situ measurement technology.