Abstract
The loosening experiments of bolted joints under shear load have been carried out. The effects of the initial tightening torque, the shear load amplitude, and the material of bolts on loosening behavior are studied. The results indicate that there exists a critical value for the shear load amplitude, below which complete loosening would not occur. It is also found that the bolted joints made of quenched and tempered steel and stainless steel have a significant anti-loosening performance. Damage mechanisms of the contact thread surfaces are adhesive wear, delamination and oxidative wear.
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