Professional paper

An Experimental Method for Measuring the Clamping Force in Double Lap Simple Bolted and Hybrid (Bolted-Bonded) Joints

Firooz Esmaeili Goldarag ; Department of Mechanical Engineering, University College of Nabi Akram (UCNA), Tabriz, Iran
Sajjad Barzegar ; Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran
Alireza Babaei ; Department of Mechanical Engineering, University College of Nabi Akram (UCNA), Tabriz, Iran

Abstract

In this research, an experimental method for measuring the clamping force as a result of tightening torque in double lap simple bolted and hybrid (bolted-bonded) joints is proposed. Two types of joints, i.e. double lap simple and hybrid (bolted-bonded) joints were prepared for testing. In order to measure the clamping force or pretension resulting from the tightening torque at different applied torques, for both types of joints, a special experimental method was designed using a steel bush that was placed between the nut and the plate. Two strain gauges were stuck to the outer surface of the bush to measure the compressive axial strain and also the stress in the bush using Hooke’s law. Finally, the axial force in the bush and subsequently the clamping force were determined. The test was repeated three times for each case to obtain the mean value of compressive strains and to determine the corresponding clamping forces. The relationship between the applied tightening torques and the mean value of compressive strains for both types of joints are shown in graphs.

Keywords

Clamping force; Bolted joint; Hybrid joint; Tightening torque

Hrčak ID:

148559

URI

https://hrcak.srce.hr/148559

Publication date:

18.11.2015.

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