Numerical and theoretical studies of bolted joints under harmonic shear displacement

Liu, Jianhua; Ouyang, Huajiang; Ma, Liang; Zhang, Chaoqian; Zhu, Minhao

doi:10.1590/1679-78251379

Cited by 13 publications

(5 citation statements)

References 23 publications

(23 reference statements)

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“…This implies that the risk of deformation and failure was the highest in the first three engaged bolt threads due to significantly higher stress levels that they tolerated compared to the rest of the threads. These results are in good agreement with the findings from other researchers [22,23].…”

Section: Stress Concentration Factorsupporting

confidence: 94%

“…Analysing SCF is crucial in order to identify the most vulnerable regions in the bolted connections, where there is a higher likelihood of crack initiation and propagation. Previous studies on smaller bolts suggest that the highest values of SCF are expected to be observed along the first few engaged threads [22,23]. In the current study, the variations in SCF values were quantitatively analysed at the root of the threads in the bolt and also in the nut, as shown in red and blue lines, respectively, in Figure 8.…”

Section: Stress Concentration Factormentioning

confidence: 76%

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Numerical Analysis of Stress Distribution in Offshore Wind Turbine M72 Bolted Connections

Redondo

Mehmanparast

2020

Metals

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The use of bolted joints to connect the transition piece and monopile is nowadays widely applied in the offshore wind industry. Traditionally, grouted connections were used in the early generation of offshore wind turbines, but the experienced failures in such connections led to an increased tendency towards bolted flange connections to join the transition piece and monopile in the new generation of offshore wind turbines. The bolts used for this purpose have high strength and huge sizes, and are subjected to a preload that is applied during the tightening process. The present study is focused on the analysis of preload effects on stress distribution in M72 bolted connections by considering different friction coefficients between the bolt and nut threads. The bolt is considered to be made of grade 10.9 steel, whereas the nut is assumed to be made of grade 8.8 steel, which is a softer material. Using the finite element commercial software package Abaqus, numerical models were developed and analysed to establish trends for stress distribution and plastic strains during the bolt tightening process, and to quantify stress concentration factors in individual engaged threads.

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Section: Stress Concentration Factorsupporting

confidence: 94%

Section: Stress Concentration Factormentioning

confidence: 76%

Numerical Analysis of Stress Distribution in Offshore Wind Turbine M72 Bolted Connections

Redondo

Mehmanparast

2020

Metals

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“…in which P is the preload of the bolt, m is the static friction factor, and F is the friction force. It has been reported (Liu et al, 2015) that the coefficient of friction m is not constant but changes with the preload P. It has also been reported that the sliding friction coefficient is smaller than the static friction coefficient, and the static friction coefficient depends on the treatment measure methods for contacting surfaces (Liu et al, 2015), which leads to friction coefficients with uncertainty. Moreover, the preload P has high variability as a result of random construction errors and is difficult to measure in real structures.…”

Section: Model Of Typical Stick-slip Componentmentioning

confidence: 99%

Displacement-dependent nonlinear damping model in steel buildings with bolted joints

Huidong

Zhu

et al. 2018

Advances in Structural Engineering

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The stick–slip phenomenon is commonly found at structural connections in steel buildings. It is a major damping mechanism in a structure with bolted joints and makes a significant contribution to the total structural damping. This article reviews the stick–slip damping model of an elastic single-degree-of-freedom system with one stick–slip component. It is observed that the damping ratios of the system with the stick–slip mechanism first quickly increase when experiencing a very small displacement and then slowly decrease. After the number of activated slip surfaces is assumed to be a linear function related to the structural displacement, the equivalent damping ratios of a structural system with numerous stick–slip components are derived. However, this displacement-dependent damping model is very difficult to be used for a structural dynamic analysis due to its inherent complexity. Therefore, a new displacement-dependent damping model for a structural dynamic analysis is proposed based on the viscous damping. A high-rise steel moment resisting frame with bolted joints subjected to an earthquake ground motion is taken as an example to verify the proposed method.

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“…Past research indicated that the degree of thread surface damage decreased with the increase of working thread ring [38,41]. Thus, the damage of the first thread is analyzed using SEM and EDX.…”

Section: Sem Investigationmentioning

confidence: 99%

Anti-loosening performance of coatings on fasteners subjected to dynamic shear load

et al. 2017

Self Cite

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This paper investigates the self-loosening of threaded fasteners subjected to dynamic shear load. Three kinds of typical coatings, PTFE, MoS 2 , and TiN applied to bolts and nuts, are tested in this investigation. The study experimentally examines the loosening mechanisms of fasteners and assesses the anti-loosening performance of the three tested coatings based on their tightening characteristics, loosening curves, and the damage of thread surface. Additionally, the anti-loosening performance of the three coatings is compared under different load forms. The results indicate that the PTFE and MoS 2 coatings have significant anti-loosening effect, whereas the anti-loosening performance of TiN coating is not satisfactory. It is also found that an appropriate increase of the initial tightening torque can significantly improve the anti-loosening effect. In addition, the microscopic analyses of PTFE and MoS 2 coating reveal that a reduced initial tightening torque leads to fretting wear on the thread contact surfaces of fasteners, thereby aggravating the damage.

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Numerical and theoretical studies of bolted joints under harmonic shear displacement

Cited by 13 publications

References 23 publications

Numerical Analysis of Stress Distribution in Offshore Wind Turbine M72 Bolted Connections

Numerical Analysis of Stress Distribution in Offshore Wind Turbine M72 Bolted Connections

Displacement-dependent nonlinear damping model in steel buildings with bolted joints

Anti-loosening performance of coatings on fasteners subjected to dynamic shear load

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