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International Journal of Rotating Machinery
Volume 2014, Article ID 410813, 8 pages
Research Article

An Analytical Model for Rotation Stiffness and Deformation of an Antiloosening Nut under Locking Force

1The 16th Institute of the Ninth Academy, China Aerospace Science and Technology Corporation, Xi’an 710100, China
2State Key Laboratory for Manufacturing System, Xi’an Jiaotong University, Xi’an 710049, China
3Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi’an Jiaotong University, Xi’an 710049, China

Received 2 May 2014; Accepted 2 July 2014; Published 29 September 2014

Academic Editor: Sergio Preidikman

Copyright © 2014 X. J. Jiang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Screw fasteners are undoubtedly one of the most important machine elements due to their outstanding characteristic to provide a high clamping force just with a simplified design. However, the loosen vibration is their inherent and inevitable fault. The friction locking approach is one of the basic locking fastener categories by enhancing the bearing load on the contact surface of thread by applying a locking force on an antiloosening nut. This locking force may cause more severe deformation in the nut. The contact stress distribution on the nut would be changed and that can cause the variation of the friction torque for the bolt joint. However, there exists no established design calculation procedure that accounts for the rotation deformation and its stiffness of the antiloosening nut under the locking force. The main objective of the work is to develop an analytical solution to the rotation deformation problem encountered in the antiloosening nut. The proposed model is supported by comparison with numerical finite element analysis of different sizes of joint elements and different applied forces.