Experimental study of loosening behavior of plain shank bolted joint under dynamic loading. Issue 1 (2nd February 2015)

• Record Type: Journal Article
• Authors: Dravid, Shriram; Triphati, Kartikeya; Chouksey, Manoj
• Is Part Of: International journal of structural integrity. Volume 6:Issue 1(2015)
• Page Start: 26
• Page End: 39
• Publication Date: 2015-02-02
• Subjects: Bolted joint -- Loosened angle -- Test rig -- Tightening torque; Structural engineering -- Research -- Periodicals; 620.11205
• DOI: 10.1108/IJSI-09-2013-0024
• Languages: English
• ISSNs: 1757-9864

Abstract

Abstract : Purpose: – Bolted joints are commonly used to connect structural members. These joints can be disassembled whenever required. Various types of washers are used between nut and the connected member to keep the joints tight. However, these joints often become loose over time under dynamic loading conditions. The purpose of this paper is to know the reasons of loosening of bolted joints and to identify the main parameters that contribute to the bolt loosening, and to verify them with previous work. Design/methodology/approach: – This work studies loosening of bolted joint in a test rig under varying tightening torque as well as for various types of washers used as the number of load cycles increases. Four trial runs are taken for each case considered and the average results are found out to minimize possible sources of errors. For the purpose, a specifically made test rig is used which is capable of applying harmonic load on the bolted joint by the lever action. Findings: – The study compares the loosening of bolted joint with and without washer, and also under different initial tightening conditions. This study has shown the suitability of the test rig, methodology and parameters for study of loosening in bolted joints. This study presents an indigenous test, capable of applying harmonic load on bolted joint. Originality/value: – The results establish that the methodology and parameters selected were appropriate for the purpose of study of loosening of bolted joints. This study has provided a base line for further work to understand the loosening of bolted joints.