滑动产生的声发射与螺栓连接界面摩擦条件之间的定量关系

IF 2.9 3区 工程技术 Q2 ENGINEERING, CHEMICAL Tribology Letters Pub Date : 2024-05-17 DOI:10.1007/s11249-024-01866-0
Jiaying Sun, Dongwu Li, Huiyi Yang, Chao Xu
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引用次数: 0

摘要

螺栓连接广泛应用于各种工程结构中。螺栓连接在长期振荡载荷作用下可能会出现松动,并导致接触界面之间产生往复摩擦。声发射(AE)是一种快速释放瞬态弹性波的现象,会在往复摩擦过程中持续产生。摩擦条件会影响接触界面的特性和相关的声发射信号。因此,分析摩擦条件与 AE 信号之间的定量关系对于将 AE 技术应用于螺栓松动监测具有重要意义。然而,目前有关 AE Vrms 与摩擦运行参数之间关系的研究大多集中在旋转机械上,所得出的结论是否适用于螺栓连接尚不明确。本文通过比较理论和实验 AE Vrms,发现常用的 AE Vrms 与摩擦运行参数之间的定量关系并不适用于螺栓连接结构。然后通过指数参数拟合修改了这一关系,并使用本文中的相同实验进行了验证。结果表明,修正后的方程能准确描述 AE Vrms 与摩擦运行参数之间的定量关系,从而揭示了毛滑动过程中产生声发射信号的机理。
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Quantitative Relationship Between Sliding-Generated Acoustic Emission and Friction Conditions at Bolted Joint Interfaces

Bolted joints are widely used in various engineering structures. The bolted joint may become loosening under long-term oscillating load, and cause reciprocating friction between the contact interfaces. Acoustic emission (AE) is a phenomenon of rapid release of transient elastic waves, which will be generated continuously during the reciprocating friction. The friction conditions will affect the characteristics of the contact interface and the related AE signals. Therefore, analyzing the quantitative relationship between friction conditions and AE signal is significant for applying AE technique in bolt loosening monitoring. However, researches on the relationship between AE Vrms and friction operating parameters are mostly focused on rotating machineries currently, whether the obtained conclusions are suitable for bolted joints is not clear. This paper finds that the commonly used quantitative relationship between the AE Vrms and friction operating parameters is not suitable for bolted joint structures by comparing the theoretical and experimental AE Vrms. The relationship is then modified through exponential parameter fitting and verified using the same experiments in this paper. The results show that the modified equation can accurately describe the quantitative relationship between the AE Vrms and the friction operating parameters, thus revealing the mechanism of acoustic emission signals generated during the gross-slip.

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来源期刊
Tribology Letters
Tribology Letters 工程技术-工程:化工
CiteScore
5.30
自引率
9.40%
发文量
116
审稿时长
2.5 months
期刊介绍: Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.
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