Electromagnetic Inspection Method of Slack of High Tension Bolt

Author

Gotoh, Yusuke ; Teshima, Y. ; Takahashi, Naoyuki

Author_Institution

Dept. of Mech. & Energy Syst. Eng., Oita Univ., Oita, Japan

Volume

47

Issue

10

fYear

2011

Firstpage

2566

Lastpage

2569

Abstract

The inspection of the slack of the steel high-tension bolt is important in the maintenance of various mechanical parts and buildings, etc. There occurs the difference of the magnetic property of the bolt head when the axis force of the fastened bolt is increased. Therefore, the evaluation of the slack of the bolt is possible by detecting the difference of the magnetic characteristics. In this paper, the electromagnetic method for measuring the slack of the steel high-tension bolt using an alternating magnetic field is proposed. The stress and flux density in the bolt head are estimated by 3-D stress analysis using the finite-element method and nonlinear electromagnetic finite element analysis taking account of the electromagnetic property under various compressive stresses. In addition, the experimental verification is also carried out.

Keywords

fasteners; finite element analysis; inspection; maintenance engineering; steel; stress analysis; 3D stress analysis; axis force; bolt head; buildings; compressive stresses; electromagnetic inspection method; fastened bolt; flux density; maintenance; mechanical parts; nonlinear electromagnetic finite element analysis; slack inspection; slack measurement; steel high-tension bolt; stress density; Compressive stress; Fasteners; Force; Inspection; Magnetic heads; Steel; 3-D nonlinear finite-element method (FEM); compressive stress; electromagnetic non-destructive inspection; magnetic characteristic; slack of high-tension bolt;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2011.2156761

Filename

6027635