Design of multi-bolted joints to prevent self-loosening failure

Dinger, G.

doi:10.1177/0954406215612813

Cited by 14 publications

(18 citation statements)

References 9 publications

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“…Unfortunately, to avoid any plasticity within the bolt, the diameter of the screw then needs to be increased, leading to additional mass compared to the initial choice of component. It has been observed V. Rafik, B. Combes, Alain Daidié, C. Chirol that this loss of preload can be caused by the rotation of the nut on the screw [1]. A better understanding of self-loosening may reduce the weight of the structure without impacting its lifetime.…”

Section: Industrial and Scientific Contextmentioning

confidence: 99%

“…In order to carry out a phenomenological study of the self-loosening of a bolted assembly, the phenomena implying the loss of preload need to be understood. Numerous researchers have taken an interest in this subject ( [1,2,3,4,5,6,7,8,9,10,11,12,13]). However, it is important to distinguish two general aspects of the loss of preload: untightening and unscrewing.…”

Section: Industrial and Scientific Contextmentioning

confidence: 99%

“…He also considered that the bending of the screw was the deformation that induced the sliding of these different surfaces. Koch [1] proposed a deeper explanation based on Junker's observations and further tests. He considered that self-loosening could be divided into 4 steps, Figure 1:  Step 1: the plate does not move relative to the frame  Step 2: the plate slips on the frame, the screw starts to bend as its nut and head are immobile relative to the plate but sliding occurs in the threads, …”

Section: State Of the Art On Self-looseningmentioning

confidence: 99%

“…Most of the models built to study the self-loosening of bolts concentrate only on the screw, the nut being modeled as a threaded insert ( [2,3,13]). The clamped parts are rarely considered ( [1,3,6,8,9,11,13]). As the threads are not modeled most of the time, the preload is applied through a bolt load and by the relative rotation of the nut on the screw ( [1,2,6,9,11]).…”

Section: Aims Of the Studymentioning

confidence: 99%

“…The clamped parts are rarely considered ( [1,3,6,8,9,11,13]). As the threads are not modeled most of the time, the preload is applied through a bolt load and by the relative rotation of the nut on the screw ( [1,2,6,9,11]). This movement might deform the threads plastically and might impact the behavior of the bolt when it is cross-loaded.…”

Section: Aims Of the Studymentioning

confidence: 99%

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Experimental and Numerical Study of the Self-loosening of a Bolted Assembly

Rafik

Combes

Daidié

et al. 2019

Advances on Mechanics, Design Engineering and Manufacturing II

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The self-loosening of a bolted assembly is a phenomenon that has been studied several times in the past. Among the stresses present, it has been shown that transverse loading might cause the most severe loosening. Thus, different explanations have been proposed. In spite of their similarity, as they all consider sliding as the root cause, they can be distinguished from one another by the surface that is considered to slide. This paper aims to give another point of view of the overall problem in order to support Zadoks' theory [7], which highlights the transverse sliding of components. For this, firstly, a double-shear assembly will be modeled. Its specificities are the preload application by screwing the nut, and the use of a self-locking nut. Secondly, some tests will be done in order to validate the model built. The experiments will also take account of the effect of the thickness of the assembly in the self-loosening. Thirdly, the analysis of the numerical results and of the experiments, especially the interface surfaces, will give us a clue enabling us to approach the sliding phenomenon, which is, according to Zadoks, the movement leading to self-loosening of the assembly.

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Section: Industrial and Scientific Contextmentioning

confidence: 99%

Section: Industrial and Scientific Contextmentioning

confidence: 99%

Section: State Of the Art On Self-looseningmentioning

confidence: 99%

Section: Aims Of the Studymentioning

confidence: 99%

Section: Aims Of the Studymentioning

confidence: 99%

See 3 more Smart Citations

Experimental and Numerical Study of the Self-loosening of a Bolted Assembly

Rafik

Combes

Daidié

et al. 2019

Advances on Mechanics, Design Engineering and Manufacturing II

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Simplified Analysis of the Early Stage Self-loosening of a Shear-Loaded Bolted Joint

Rafik

Daidié

Combes

et al. 2019

Structural Integrity

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The self-loosening of a joint through unscrewing of the bolt is a phenomenon mainly occurring when the assembly is solicited by transverse repeated loads. Previous works highlighted that the transversal sliding of the bearing surfaces, either in the threads or underneath the bearing surfaces of bolts and/or nuts, is its root cause and that this phenomenon begins during the first loading cycles. In order to study the early stage of this self-loosening, a simplified numerical model has been developed. The latter factors the bearing surfaces of the bolt, the preload, the friction coefficient, the amplitude of the shear-load and the fastener's material. Through measurements and interpretation of the results, the shearing of the fastener has been identified as the main deformation leading to the self-loosening of the assembly, while the bending of the fastener shank limits the self-loosening. Moreover, according to the values of preload and shear-load, the behaviors were identified, and an interpretation has been proposed.

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Review of research on loosening of threaded fasteners

et al. 2021

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Loosening of threaded fasteners is a key failure mode, which is mainly caused by the slippage and friction behaviors on the thread and bearing surfaces, and will affect the integrity and reliability of products. Numerous scholars have conducted research on the loosening of threaded fasteners; however, comprehensive reviews on the loosening of threaded fasteners have been scarce. In this review article, we define loosening as a loss of preload and divide it into non-rotational and rotational loosening. The causes and mechanisms of non-rotational and rotational loosening are summarised. Some essential topics regarding loosening under transverse vibration have also attracted significant attention and have been investigated widely, including the loosening curve, critical condition of loosening, and influencing factors of loosening. The research carried out on these three topics is also summarised in this review. It is believed that our work will not only help new researchers quickly understand the state-of-the-art research on loosening, but also increase the knowledge of engineers on this critical subject. In the future, it is important to conduct more quantitative research on local slippage accumulation, and the relationship between local slippage accumulation and rotational loosening, which will have the potential to comprehensively unravel the loosening mechanism, and effectively guide the anti-loosening design of threaded fasteners.

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Design of multi-bolted joints to prevent self-loosening failure

Cited by 14 publications

References 9 publications

Experimental and Numerical Study of the Self-loosening of a Bolted Assembly

Experimental and Numerical Study of the Self-loosening of a Bolted Assembly

Simplified Analysis of the Early Stage Self-loosening of a Shear-Loaded Bolted Joint

Review of research on loosening of threaded fasteners

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