The Loosening Behavior of Bolted Connection and Riveted Connection Under Cyclic Shear Load
With its excellent anti-loosening performance,the riveted connection is used in more and more engineering fields.In order to study the loosening performance of a new domestic rivet under cyclic shear load,this paper takes the most widely used bolt connection as the control,and carries out the loosening test research under cyclic shear load on a common bolt of grade 4.8,4.8 anti-loosening bolt and small-sized pull rivet of size 8 mm,respectively.This paper analyzes the loosening process of the three types of connections under cyclic shear load,and studies the load amplitude and frequency.The effects of load magnitude and frequency on the loosening behavior of bolted and riveted connections were investigated.The damage morphology was analyzed in combination with microscopic test methods to further study the loosening prevention principle and micro-motion damage mechanism of bolts and rivets under cyclic shear loading.The study shows that the anti-loosening performance of riveted connections is better than that of bolted connections under the same working conditions.The loosening of bolted and riveted connections increases when the load amplitude increases or the load frequency decreases.The anti-loosening performance of rivets is significantly improved when compared with that of bolts due to their unique circular structure,and the interference fit mechanism of the mating surface after riveting.The wear mechanisms of bolts and rivets are mainly abrasive wear and fatigue wear.
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