Residual clamping force of bolt connections caused by sectional damage of nuts

Ahn, Jin-Hee; You, Jun Min; Huh, Jungwon; Kim, In‐Tae; Jeong, Young-Soo

doi:10.1016/j.jcsr.2017.05.019

Cited by 22 publications

(7 citation statements)

References 9 publications

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“…According to equation (11), the transmission time of the coda wave t CP ðσ 1 Þ and t CP ðσ 2 Þ are related to the value of k. Since the wave path summation theory does not specify how the waves are being scattered and only states that the wavefield is the superposition of the waves propagating along all possible scattering paths, 73 the specific wave path cannot be determined in our physical model. Therefore, the value of k cannot be measured.…”

Section: Stretching Approachmentioning

confidence: 99%

“…[3][4][5] However, during the service life of bolt connections, due to the adverse factors, such as structural vibrations, 6,7 thermal cycling, 8 and corrosion, 9,10 bolt connections are often subject to the loss of the pre-load. 11 The looseness of pre-load at bolt joints threatens the safety of structures. 12,13 To ensure the safety of bolt joints, it is necessary to develop effective approaches to monitoring the bolt pre-load looseness.…”

Section: Introductionmentioning

confidence: 99%

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High resolution bolt pre-load looseness monitoring using coda wave interferometry

Chen

Huo

Song

2021

Structural Health Monitoring

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This paper proposes a new concept, named the Detectable Resolution of Bolt Pre-load (DRBP), by using the coda wave interferometry (CWI) to quantitatively measure the pre-load looseness at a high resolution. Due to its characteristics of roughness, irregularity, and randomly distributed asperities, the contact surface of the bolted components can function as a natural interferometer to scatter the propagation waves. The multiply-scattered coda waves can amplify the slight changes in the travel path and show the visible perturbation in the time domain. By calculating the time-shifted correlation coefficient of coda waves before and after the slight pre-load looseness, the tiny pre-load changes can be clearly revealed. To evaluate the feasibility of the proposed method, a theoretical model considering the time shifts of coda waves and the variations of pre-load is established. Based on the acoustoelastic effect and the wave path summation theory of coda wave interferometry, the model shows that the time shifts of coda waves change linearly with the variations of pre-load. Verification experiments are conducted, and the results show that the R-square values of the fitting curves are larger than 0.9216. In addition, the proposed approach has the feature of high resolution. The ultimate pre-load resolution of the proposed approach is 0.331%, that is, when the variation of pre-load is larger than 0.331%, it can be detected. Therefore, theoretical analysis and experimental results prove that the CWI-based pre-load detection approach holds great potential for the detection of bolt pre-load looseness, especially during the initial stage.

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Section: Stretching Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High resolution bolt pre-load looseness monitoring using coda wave interferometry

Chen

Huo

Song

2021

Structural Health Monitoring

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“…Corrosion in bolted joints is a vast topic to be covered in a single section and, therefore, a brief summary of previously published works relevant to offshore wind industry is mentioned here [54][55][56][57][58][59][60][61][62]. Bolted joints in the offshore wind industry are even more prone to corrosion as they are continuously exposed to marine environment [63,64].…”

Section: Corrosionmentioning

confidence: 99%

A Review of Challenges and Opportunities Associated with Bolted Flange Connections in the Offshore Wind Industry

Mehmanparast

Lotfian

Vipin

2020

Metals

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The use of bolted flange connections in the offshore wind industry has steeply risen in the last few years. This trend is because of failings observed in other modes of joints such as grouted joints, coupled with enormous economic losses associated with such failures. As many aspects of bolted flange connections for the offshore wind industry are yet to be understood in full, the current study undertakes a comprehensive review of the lessons learned about bolted connections from a range of industries such as nuclear, aerospace, and onshore wind for application in offshore wind industry. Subsequently, the collected information could be used to effectively address and investigate ways to improve bolted flange connections in the offshore wind industry. As monopiles constitute an overwhelming majority of foundation types used in the current offshore wind market, this work focusses on large diameter flanges in the primary load path of a wind turbine foundation, such as those typically found at the base of turbine towers, or at monopile to transition piece connections. Finally, a summary of issues associated with flanges as well as bolted connections is provided, and insights are recommended on the direction to be followed to address these concerns.

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“…However, the effect of corrosion on the preload force of high-strength bolts is not considered in previous study. To the best of authors' knowledge, only Ahn et al [15] employed the loss of sectional area of high-strength bolts to consider the influence of corrosion on the preload force of high-strength bolts using experimental method, and a model was suggested for predicting the residual value of the preload force of high-strength bolts. Jiang et al [16], Kong and Hong [17], and Hong [18] performed test to study the preload force loss of high-strength bolts after corrosion, and the results showed that the preload force loss reached 41.2% when the corrosion rate reached 10%.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Preload Force Loss of Corroded High- Strength Bolts

2022

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Corrosion significantly affects the structural behavior of members in a connection (i.e., the preload force of bolts, the thickness of steel plates, and the anti-sliding friction of steel plates). The preload force of bolts is a key factor affecting the bearing capacity of high-strength bolts shear connections, and it will be significantly influenced by corrosion. In this study, the preload force loss of high-strength bolts shear connections after corrosion is studied. A finite element model validated by previous experiment is developed for estimating the preload force loss of high-strength bolts after corrosion. The value of the preload force loss of corroded highstrength bolts increases as the corrosion rate, but the effect of steel grade on the preload force loss is not obvious. Based on the results of finite element analysis, a degradation model for predicting the preload force loss of corroded high-strength bolts is suggested, and the degradation model agrees well with various test data. The results of this study can provide a reference for safety assessment of corroded high-strength bolted shear connections.

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Residual clamping force of bolt connections caused by sectional damage of nuts

Cited by 22 publications

References 9 publications

High resolution bolt pre-load looseness monitoring using coda wave interferometry

High resolution bolt pre-load looseness monitoring using coda wave interferometry

A Review of Challenges and Opportunities Associated with Bolted Flange Connections in the Offshore Wind Industry

Numerical Study of the Preload Force Loss of Corroded High- Strength Bolts

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