Numerical study of self-loosening of a bolted assembly under transversal load

Ksentini, Olfa; Combes, Bertrand; Abbès, Mohamed Slim; Daidié, Alain; Haddar, Mohamed

doi:10.1051/meca/2015113

Cited by 8 publications

(3 citation statements)

References 13 publications

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“…Zhou [2] studied the effect of load amplitude and material under shear load, and the results showed that the amplitude of shear load at a critical point below which the bolt will not be completely loose. Ksentini [3] studied the related values of bolt assembly loosening under the transverse load. Jiang [4] analyzed the loosening performance of bolts in the connection structure of super-elastic shape memory alloy material.…”

Section: Introductionmentioning

confidence: 99%

Loosening of Bolted Connections under Transverse Loading in Timber Structures

Chen

Wang

et al. 2020

Forests

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Bolted joints are widely used in timber structures, and the loosening of bolt connections will reduce the structural performance. In this paper, a mechanical model of bolt connection for timber structures is established, and the process of bolt loosening under a transverse load is investigated. By using the finite element method to construct an accurate thread model with a helix angle, the thread contact state during the bolt loosening procedure was analyzed in detail, and the factors such as load amplitude, load frequency, load location, and different timber materials on bolt loosening are also studied. In the timber structure, the load amplitude is the main factor affecting the bolt loosening, the decay rate of the preload in the bolted joint is positively correlated with the amplitude of the cyclic transverse load. The frequency of the loading has a smaller effect on the looseness, the preload decreases as the frequency increases. When the load is applied to the smooth rod part of the bolt, the preload force will decrease rapidly, and the distance between the load position and the bolt has no effect on the change in looseness. The decreasing range of the preload is different with different timber material, but the decreasing law is the same. The model can be applied to analyze the loosening rule of bolted connections in timber structures.

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Section: Introductionmentioning

confidence: 99%

Loosening of Bolted Connections under Transverse Loading in Timber Structures

Chen

Wang

et al. 2020

Forests

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“…Gong et al [22] analyzed local slippage accumulation on the bearing surface using the modified Iwan's model and developed a thorough understanding of the loosening mechanism. Various theoretical models [23][24][25][26][27][28][29][30][31][32][33] have been proposed to understand the mechanism of loosening caused by complete slippage under transversal vibration. Yokoyama et al [34] investigated the loosening of bolted joints subjected to cyclic torqueing.…”

Section: Introductionmentioning

confidence: 99%

Research on the Numerical Calculation Method for Antiloosening Performance of Screwed Joints under Complex Working Conditions

Yi-min

Guo

Qin

et al. 2020

Mathematical Problems in Engineering

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This study aimed at addressing the difficulties entailed in accurately determining the working loads of screwed joints (SJs) by establishing mechanical models and verifying the accuracy of the numerical calculation model of antiloosening performance under complex working conditions. First, considering the slip state of the interface and the stress state of the thread surface, a corresponding mechanical model was established to investigate the quantitative model of the interaction amongst structural parameters, complex working loads, and antiloosening performance of SJs. The applicability of existing models is expanded by this new model. Second, a load calibration test, an actual working condition test, and a dynamic simulation were combined to accurately determine the load under complex working conditions. A new experimental scheme for measuring the critical residual preload was employed to verify the reliability and accuracy of the numerical calculation model. The results confirmed that structural safety is ensured and that accident risk is reduced. Finally, based on this model, the transverse load, axial load, bending moment, torque about the bolt axis, clamping eccentricity, loading eccentricity, and coefficient of friction in the thread and at the interface were analyzed in terms of the antiloosening performance. The results of this study are expected to provide significant guidance to engineering practices. Moreover, the numerical calculation model can accurately predict the antiloosening performance and failure and also provide technical support for improving the structural reliability, particularly for key screwed-joint structures (SJSs), under complex working conditions loading.

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“…Besides the aforementioned theoretical and experimental research efforts, many scholars have also analyzed the load transfer mechanism of the anchoring system through numerical simulation. [17][18][19] These include analysis of the force balance and the shear stress distribution in each section of the anchor associated with the group anchor system, 20 3D numerical simulation of the rock with soft-hard combination, and the pressuredispersed anchor cable. [21][22][23] The results show that the axial force and the shear stress distributions on the anchorage interface are closely related to the rock properties, bolt material, geometric parameters, and thickness of the bonding layer.…”

Section: Introductionmentioning

confidence: 99%

Load transfer mechanism and reinforcement effect of segmentally yieldable anchorage in weakly consolidated soft rock

Zhao

Tan

et al. 2018

SIMULATION

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Mine disasters, such as large deformation, floor heave, and roof fall, occur extremely easily in weakly consolidated soft rock strata in western China, posing enormous challenges to traditional anchorage support design. To avoid tensile failure of bolts as a result of the superposition effect of stress accumulation, a segmentally yieldable anchorage support, taking into consideration the different failure zones in surrounding rock, is presented in this paper. First, load transfer mechanisms and the process of anchorage failure are analyzed for end anchorage, full-length anchorage, and segmentally yieldable anchorage based on numerical pull-out tests. Results show that the load transfer follows a multipeak chain-like trend in the case of multipoint segmental anchorage, and that the peaks of stress attenuate slowly. Therefore, the proposed anchorage type can leverage the shear strength effectively. Furthermore, numerical models for the applications of the aforementioned three different anchoring modes to weakly consolidated soft strata are established. Results indicate that segmentally yieldable anchorage can withstand larger tensile deformation and surrounding rock deformation. Moreover, the bolt shows higher strength reservation. A combination of these characteristics is conducive to controlling deformation and damage during roadway excavation.

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Numerical study of self-loosening of a bolted assembly under transversal load

Cited by 8 publications

References 13 publications

Loosening of Bolted Connections under Transverse Loading in Timber Structures

Loosening of Bolted Connections under Transverse Loading in Timber Structures

Research on the Numerical Calculation Method for Antiloosening Performance of Screwed Joints under Complex Working Conditions

Load transfer mechanism and reinforcement effect of segmentally yieldable anchorage in weakly consolidated soft rock

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