Study on self-loosening of bolted joints excited by dynamic axial load

Liu, Jianhua; Ouyang, Huajiang; Feng, Zhiqiang; Cai, Zhenbing; Liu, Xuetong; Zhu, Minhao

doi:10.1016/j.triboint.2017.05.037

Cited by 67 publications

(26 citation statements)

References 61 publications

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“…Self-loosening happens when this stored energy is released as the result of overcoming of above mentioned friction forces by any means. There are various theories and previous works on the reason for self-loosening of bolts through vibration, thermal cycles, and thermal shock [34][35][36][37][38][39][40][41][42][43]. Broadly speaking, the works agree that, unless an external load acts on the bolted joint, the frictional forces will remain intact.…”

Section: Self-looseningmentioning

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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Section: Self-looseningmentioning

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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“…This discrepancy is caused mainly by the initial part of the tensile process, where the slip stage had a different course. After the slip between the connected plates, the contact area and the contact stiffness of the bolted interfaces may be reduced due to the loss of the bolt preload [43,44]. In both specimens, such micro-scale changes at the interface areas could occur in a different way.…”

Section: Tensile Tests and Failure Modesmentioning

confidence: 99%

Monitoring Steel Bolted Joints during a Monotonic Tensile Test Using Linear and Nonlinear Lamb Wave Methods: A Feasibility Study

Rucka

2018

Metals

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The structural integrity of steel bolted joints may be compromised due to excessive loading. Therefore, condition assessment and the detection of potential defects before they cause a failure have become a major issue. The paper is focused on the condition monitoring of a bolted lap joint subjected to progressive degradation in a tensile test. The inspection used Lamb waves propagated through the overlap area. Wave propagation signals were registered automatically by means of piezoelectric transducers. Two damage indices were defined based on linear and nonlinear features of Lamb waves. The use of a network of piezoelectric transducers and the analysis of multiple signals instead of single ones was proved to effectively monitor the state of the bolted joint. The obtained results showed that the method enabled to detect selected stages of the degradation process and to characterize the reduction of the contact area between the plates in the overlap area.

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“…The cyclic loading will cause the bolted joint to be self-loosened Horn and Schmitt [30] Relaxation in Bolted Thermoplastic Compositejoints The cyclic loading will cause fretting wear the result in the reduction of clamping force Liu et al [31] Study on self-loosening of bolted joints excited by dynamic axial load…”

Section: Screw Self-loosening In Bolted Jointsmentioning

confidence: 99%

“…The fretting wears lead to steady reduction of the clamping force as the number of loading cycles increase [30]. In Liu et al [31] papers it is stated that when bolted joints are exposed in a vibrational environment the main failure mode of the bolted joints is the self-loosening. They also studied on the selfloosening behavior of bolted joint excited by dynamic axial load at fives levels on both preload and excitation amplitude.…”

Section: Ricci Et Al [35]mentioning

confidence: 99%

“…They also studied on the selfloosening behavior of bolted joint excited by dynamic axial load at fives levels on both preload and excitation amplitude. The varying axial load can cause micro slippage between the contact thread [31]. Housari et al [32] concluded that the friction coefficient that plays a role in the loosening rate is affected by the fastener coating and lubricant.…”

Section: Ricci Et Al [35]mentioning

confidence: 99%

See 1 more Smart Citation

Screw-Bone Implant Loosening: Complication, Cause and Assessment

Ghani¹,

Hassan²,

Daud³

2018

IJET

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Bone fracture has become more common in this era of vehicular modernization. Internal fixation has been used in the treatment of such cases. The use of screw and plate in internal fixation has been proven to provide more stability to fracture to promote better healing. The use of screw also carries certain risk such as self-loosening that can cause non-union and prolong healing. The complication of selfloosening is studied to comprehend the danger of self-loosening in screw-bone implant. The review on self-loosening in bolted joint is done in this paper to gain better understanding on the nature of self-loosening phenomena. The factor that affects the screw selfloosening in bone is further studied in the screw-bone implant environment. The identification of the screw loosening can be done with radiography, CT scan, MRI and ultrasound. This article have done a brief review on the complication of screw self-loosening, the cause of screw loosening in bolted joint and screw-bone implant and the assessment of screw loosening done by ultrasound and radiography.

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Study on self-loosening of bolted joints excited by dynamic axial load

Cited by 67 publications

References 61 publications

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

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

Monitoring Steel Bolted Joints during a Monotonic Tensile Test Using Linear and Nonlinear Lamb Wave Methods: A Feasibility Study

Screw-Bone Implant Loosening: Complication, Cause and Assessment

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