Experimental Investigations on the Effects of Torque Tightening on the Fatigue Strength of Double-lap Simple Bolted and Hybrid (Bolted/Bonded) Joints

摘要

In this paper, the effects of bolt torque tightening on the fatigue strength of double-lap simple bolted and hybrid (bolted/bonded) joints have been studied experimentally. To do so, two types of joints, that is, double-lap simple and hybrid (bolted/bonded) joints, were studied. For each type of joints, three sets of specimens were prepared and subjected to the tightening torque of 1, 2.5 and 5Nm, and then, fatigue tests were carried out at different cyclic longitudinal load levels. Experimental tests results showed that the hybrid joints have better fatigue performance in comparison with the simple bolted joints. In addition, the investigation revealed the positive role of tightening torque on the fatigue life of both simple and hybrid joints.