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An Investigation of Optimal Pitch Selection to Reduce Self-Loosening of Threaded Fastener under Transverse Loading


Author(s):

Mahendra B Jagtap , Dattakala Group of institute, Faculty of Engineering, Bhigwan Pune; Anurag V Karande, Dattakala Group of institute, Faculty of Engineering, Bhigwan Pune

Keywords:

Rotational self-loosening, Finite element analysis, contact behaviors, preload decay curve

Abstract:

The two most widespread causes of failure of threaded fasteners subjected to dynamic loads are fatigue and vibration induced loosening. This paper presents results of a study on loosening of threaded fastener under transverse loading and change in loosening rate as thread pitch is going to change. There are different series of thread are available, out of these some threads shows resistance to rotational self-loosening of threaded fastener. Our aim is to investigate rate of loss of preload for different pitch of thread i.e. Course, medium, fine. A three-dimensional finite element (FE) model is established to study details of the rotational self-loosening process. A mathematical model is developed to study the loosening phenomenon. Such processes are characterized by either complete or localized slip at the screw head and thread contact surfaces. The computational results of the numerical simulation are compared with analytical investigations of the cyclic transverse load–displacement behavior. These show that rotational self-loosening can also occur for only localized slip without complete slipping at the head contact surface.


Other Details:

Manuscript Id :IJSTEV3I1089
Published in :Volume : 3, Issue : 1
Publication Date: 01/08/2016
Page(s): 186-193
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