Second harmonic ultrasonic components detection generated from fastened bolt

Author

Fukuda, Makoto ; Yonai, Oki ; Imano, Kazuhiko

Author_Institution

Dept. of Electr. & Electron. Eng., Akita Univ., Akita, Japan

fYear

2012

fDate

20-23 Aug. 2012

Firstpage

1160

Lastpage

1163

Abstract

This study examines the use of ultrasonic second harmonic components in the quality control of bolt-fastened structures. An improved method for detecting the second harmonic components, from a bolt fastened with a nut, using the transmission method is constructed. A hexagon head iron bolt (12-mm diameter and 25-mm long) was used in the experiments. The bolt was fastened using a digital torque wrench. The second harmonic component increased by approximately 20 dB before and after the bolt was fastened. The sources of second harmonic components were contact acoustic nonlinearity in the screw thread interfaces of the bolt-nut and were the plastic deformation in the bolt with fastening bolt. This result was improved by approximately 10 dB compared with previous our method. Consequently, usefulness of the novel method for detecting second harmonic ultrasonic components generated from fastened bolt was confirmed.

Keywords

acoustics; fasteners; plastic deformation; quality control; acoustic nonlinearity; bolt-fastened structure; digital torque wrench; hexagon head iron bolt; nut; plastic deformation; quality control; screw thread interface; second harmonic ultrasonic component detection; transmission method; Acoustics; Fasteners; Force; Harmonic analysis; Joining processes; Torque; Ultrasonic variables measurement; Contact acoustic nonlinearity; Hexagon head iron bolt; Second harmonic component; Torque;

fLanguage

English

Publisher

ieee

Conference_Titel

SICE Annual Conference (SICE), 2012 Proceedings of

Conference_Location

Akita

ISSN

pending

Print_ISBN

978-1-4673-2259-1

Type

conf

Filename

6318618