Influences of Various Factors of Bolt Tightening on Loosening-Fatigue Failure under Transverse Vibration

Hashimura, Shinji

doi:10.4271/2007-01-0807

Cited by 4 publications

(7 citation statements)

References 7 publications

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“…In point of view of presented project, the most interesting is the work [1] where author presented in a very clear way a mechanism of the self-loosening of the bolts due to the tangential load. The author shows the self-loosening is only one possible failure model of the screws and the other one is a fatigue fracture of the screw in the groove of the first thread run in the engagement.…”

Section: Introductionmentioning

confidence: 99%

“…As noted, the variable tangential load can occur in different situation in mechanical applications of the bolts/screws and it leads to fatigue fracture or to self-loosening of a bolted connection [1]. The presented work is focused only on a failure mode due the fracture of the screws.…”

Section: Introductionmentioning

confidence: 99%

“…In case of variable axial loads, the bolts/screws can withstand maximum alternating stress in range of 50 -70 MPa [1]. The bolt preload, which is slightly lower than a yield strength of the bolt material, determines that limitation.…”

Section: Introductionmentioning

confidence: 99%

“…This region was selected in the way that it covers a thread part where the maximum stress is located. The most loaded part of the correctly designed screw is the groove of the first thread run [1].…”

Section: Introductionmentioning

confidence: 99%

“…Taking into account fatigue strength, most critical part of bots/ screws is the threaded part of the bolt, precisely a first groove of a first turn in an engagement [1] (Figure 1). The very high stresses are present there, because the thread generates the stress concentration and the first run of the thread transfers the most load about 34% of the total load.…”

Section: Introductionmentioning

confidence: 99%

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Optimal Design of Cap Screw Thread Runout for Transversal and Axial Loads

Kędziora

2017

J Appl Mech Eng

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The presented work is focused on a design of a new thread runout of screws and bolts subjected by transversal loads. These types of loads can occur in a normal service of bolt connection and they can lead to a failure. Two failure modes of the screw could occur: self-loosening of the screw or fatigue failure of the screw. The latter failure mode is analysed in the presented project focusing on an improvement of the existing design of the screws in terms of fatigue failure. The fatigue fracture of the screws, which are loaded by the transversal load, occurs normally in a groove of a first thread run of an engagement. A shape of the thread runout has some influence on stress in the thread therefore that shape can optimize to minimize the thread stress. Considering this, free shape optimisation was employed to find the best runout shape. As results of the presented work, the optimum design of the thread runout is proposed for the analysed conditions. The elaborated design of the cap screw brings significant improvement of the lifetime when the cycling tangential load occurs. In addition, the new design gives the better structural performance than the existing designs also for the cycling normal loads.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimal Design of Cap Screw Thread Runout for Transversal and Axial Loads

Kędziora

2017

J Appl Mech Eng

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Identifying the anti-loosening frictional mechanism that can provide stable frictional torques while avoiding stress concentration

Liu,

Yang,

Shchelkanova

et al. 2023

J Mech Sci Technol

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Influence of Configuration Error in Bolted Joints on Detection Error of Clamp Force Detection Method

Hashimura¹,

Sakai²,

Kubota³

et al. 2021

IJAT

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Clamp force errors in bolted joints often cause accidents in various mechanical structures. Therefore, the clamp force must be controlled accurately and maintained for securing the reliability of mechanical structures such as vehicles. However, the clamp force cannot be controlled easily during tightening. Moreover, it is difficult to detect the clamp force after tightening. We previously proposed a method to easily detect the clamp force of a bolted joint that has been tightened. In that method, the bolt thread protruding from the nut is pulled while the nut’s upper surface is supported. The relationship between tensile force and displacement at the pulling point where the tensile force is applied differs before and after the tensile force reaches the clamp force. The method detects the tensile force at the point, where the relationship changes, as the clamp force. In this study, we investigate the influence of squareness error on the bearing surface of the clamped part in a bolted joint on the detection error of the method using experiments and finite element (FE) analysis. The experimental results show that the squareness error has an influence on the detection accuracy. The average detection error in the experiments increases by approximately 10% with an increase in the squareness error. To understand the cause of this phenomenon, we investigate the effects of backlash between mating thread surfaces of bolts and nuts on the detection error. The results show that the error decreased because of the backlash. Consequently, it is assumed that the error is caused by the non-separation of the mating thread surfaces when the tensile force reached the clamp force. Furthermore, the FE analysis results show that the squareness error on the bearing surface of the clamped part has an influence of the squareness error on the detection accuracy. The results indicate that we should control the tolerance of squareness errors on the bearing surface of the clamped part when the clamp force detection method is applied to bolted joints.

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Influences of Various Factors of Bolt Tightening on Loosening-Fatigue Failure under Transverse Vibration

Cited by 4 publications

References 7 publications

Optimal Design of Cap Screw Thread Runout for Transversal and Axial Loads

Optimal Design of Cap Screw Thread Runout for Transversal and Axial Loads

Identifying the anti-loosening frictional mechanism that can provide stable frictional torques while avoiding stress concentration

Influence of Configuration Error in Bolted Joints on Detection Error of Clamp Force Detection Method

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