Bolt-flange joints are widely used in many systems and structures, yet their behavior subjected to vibratory environments is still poorly understood. In this paper, we report on a series of experiments that reveal the motions of bolt-flange joints under axial vibration. It is found that the preload and vibration level affect the place and amplitude of the anti-resonance peak more. The primary estimation is that the contact friction of the two-piece flanges changes acutely when they impact each other at anti-resonance frequency.
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