Abstract
In this paper, the effect of tightening torque (clamping force) on the fatigue crack growth rate in cracked single lap simple bolted and hybrid (bolted/bonded) joints have been studied experimentally. To do so, series of fatigue crack growth tests for two different amounts of the tightening torques in Aluminum alloy 2024-T3 pre-cracked joints have been carried out to record the fatigue crack growth and also the fatigue lives of specimens. Experimental test results showed that the hybrid joints had longer fatigue crack growth life compared to the simple bolted joints at the given bolt tightening torque. Also, it was found that the higher bolt tightening torque provided improved fatigue crack growth life for both types of the joints.
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