On self-loosening of threaded joints in the case of absence of macroscopic bearing-surface sliding. Loosening mechanism under transversely repeated force.

Kasei, Shinji; Ishimura, Mitutoshi; Ohashi, Nobutoshi

doi:10.2493/jjspe.54.1381

Cited by 16 publications

(12 citation statements)

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“…However, once the nut slides at the bearing surface, the torsion is released by a rotation of a unified body composed of the bolt and the nut (6), (16) . Since the bolt-threads descend along the helix of the nut-threads with …”

Section: Behavior Of Elastic Torsion Of Bolt Shankmentioning

confidence: 99%

“…In particular, S.Izumi, et al classified contacting situations of a mating surface on threads and a bearing surface with nine kinds of combinations and explained loosening behavior in each combination. This study was planned to follow up the previous report (16) , especially about experimental considerations which have been remained not enough. So, it is the main purpose to prove the theory experimentally by using an improved experiment apparatus and consequently contribute explication of the self-loosening mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…The author, et al (16), (17) pointed out that loosening rotation can be induced even when slippages at bearing surfaces are very small and its situation should be considered as a sign capable to connect to a serious state. And a theoretical consideration about the loosening mechanism was developed by basing on the hypothesis (6), (7) mentioned above.…”

Section: Introductionmentioning

confidence: 99%

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A Study of Self-Loosening of Bolted Joints Due to Repetition of Small Amount of Slippage at Bearing Surface

Kasei

2007

JAMDSM

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This paper deals with the mechanism and relating matters on self-loosening rotation of bolted joints in the cases when very small slippages occur repeatedly at bearing surfaces under transverse loads. It can be supposed that accumulation of this kind of loosening finally produces serious states for bolted joints. Based on an assumption that a restoring force caused by an elastic torsion of a bolt shank which arises from a relative displacement between bolt and nut threads drives loosening rotation, a theoretical explanation is presented about how loosening rotation occurs and grows larger. Experiments in quasi-static states show results which agree with the theory of this paper. Additionally, consumption of transverse work and anti-loosening performance being taken up as relating subjects, more information about self-loosening is shown through examinations on some kinds of test samples.

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Section: Behavior Of Elastic Torsion Of Bolt Shankmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Study of Self-Loosening of Bolted Joints Due to Repetition of Small Amount of Slippage at Bearing Surface

Kasei

2007

JAMDSM

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“…Kasei et al [5] firstly studied the initial stage of self-loosening. The initial loss of the clamping force was attributed to the repeated twist of the nut relative to the bolt shank because of the slippage between the bolt and nut threads.…”

Section: Introductionmentioning

confidence: 99%

Self-loosening Analysis of Bolted Joints

Xu¹,

Yang²,

Yu³

2017

dtetr

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Abstract. Bolted joint is one of the most widely used connections because of relatively simple structure, reliability, easy disassembly and maintenance. However, self-loosening of bolted joints under cyclic external loading is still an unsolved issue and need to make a further research. As is known to all, the self-loosening process can be divided into two distinguishable stages under cyclic transverse loading. The first stage is featured by a short and sharp clamping force reduction with no relative rotation between the nut and the bolt. The loss of the clamping force is due to the accumulation of local cyclic plastic deformation at the root of the engaged thread, which is account for no more than 10-15%. Therefore, the second stage is the primary cause of self-loosening. In this study, a further research on the second stage self-loosening of bolted joints is presented by the ways of combining theoretical analysis with the three-dimensional finite element simulation. The nature of the second stage self-loosening of bolted joints lies in: 1) the variation of the contact pressure between the engaging thread surfaces, 2) lateral micro-slip between the engaging thread surfaces. Both of them result in an apparent slip between the engaging thread surfaces of bolt and nut which finally leads to the self-loosening of bolted joints. In addition, the effects of preload, amplitude of cyclic transverse loading and the friction coefficient of engaging surfaces on self-loosening are studied by the finite element simulation. Moreover, a reasonable explanation of the trend about the self-loosening of bolted joints is given. The corresponding results are very important for the bolted design. It can be concluded that reasonable preload may improve the ability of bolted joints resisting to self-loosening.

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“…An error in the clamping force often causes loosening and fatigue failure of the bolt/nut assembly in service (1)(2) . Bolts and nuts are generally tightened by the torque control method.…”

Section: Introductionmentioning

confidence: 99%

A New Tightening Method of Bolt/Nut Assembly to Control the Clamping Force

Hashimura¹,

Komatsu²,

Inoue

et al. 2008

JAMDSM

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The clamping force of a bolt/nut assembly greatly influences its strength. However it is well-known that the clamping force of a bolt/nut assembly tightened by the torque control method varies widely. In this study, a new tightening method of a bolt/nut assembly that controls the clamping force more accurately has been proposed. In the proposed method, a bolt/nut assembly is tightened by pulling the bolt thread portion protruding through the nut with a force corresponding to the target clamping force. Experiments to verify the usefulness of the proposed method have been performed. The results show that the proposed method can accurately tighten a bolt/nut assembly with an error of approximately ±10% in relation to the target.

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On self-loosening of threaded joints in the case of absence of macroscopic bearing-surface sliding. Loosening mechanism under transversely repeated force.

Cited by 16 publications

References 0 publications

A Study of Self-Loosening of Bolted Joints Due to Repetition of Small Amount of Slippage at Bearing Surface

A Study of Self-Loosening of Bolted Joints Due to Repetition of Small Amount of Slippage at Bearing Surface

Self-loosening Analysis of Bolted Joints

A New Tightening Method of Bolt/Nut Assembly to Control the Clamping Force

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