Abstract
ABSTRACT Bolted joints frequently experience loosening in vibrating environments, posing a threat to structural safety. Therefore, quantitatively assessing bolt loosening is critical. This study reveals the correlation between bolt preload and acoustic emission (AE) signal characteristics at the connection interface under vibration, establishing a method for quantitatively assessing the tightening state of bolted joints. First, an AE testing platform was constructed to capture AE signals across varying preload forces, enabling the calculation of frequency and energy parameters. Next, leveraging the relationship between these AE characteristics and preload force, a loosening index was developed to quantitatively assess the extent of bolt loosening. Finally, a quantitative AE-based assessment method and workflow for evaluating bolted joint status were developed, allowing for effective assessment of the full transition from tightened to loosened states. This approach provides a valuable tool for detecting bolt loosening and monitoring structural health.
Published Version
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