Bolt-Nut Loosening in Bolted Flange Connections Under Repeated Bending Moments

Ishimura, Mitsutoshi; Sawa, Toshiyuki; Karami, Atsushi; Nagao, Takanori

doi:10.1115/pvp2010-25326

Cited by 8 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Their results indicated that plastic deformation and fretting wear primarily caused a preload loss; however no evident rotational loosening occurred. Moreover, Ishimura et al [76] also conducted research on the loosening behaviour of a bolted flange structure subjected to cyclic bending vibration, and illuminated the loosening mechanism. The mechanism reported that external bending loading triggered slippage on the bearing surface of the flange structure and repeated slippage caused rotational loosening.…”

Section: Bending Vibration Loadingmentioning

confidence: 99%

Review of research on loosening of threaded fasteners

et al. 2021

View full text Add to dashboard Cite

Loosening of threaded fasteners is a key failure mode, which is mainly caused by the slippage and friction behaviors on the thread and bearing surfaces, and will affect the integrity and reliability of products. Numerous scholars have conducted research on the loosening of threaded fasteners; however, comprehensive reviews on the loosening of threaded fasteners have been scarce. In this review article, we define loosening as a loss of preload and divide it into non-rotational and rotational loosening. The causes and mechanisms of non-rotational and rotational loosening are summarised. Some essential topics regarding loosening under transverse vibration have also attracted significant attention and have been investigated widely, including the loosening curve, critical condition of loosening, and influencing factors of loosening. The research carried out on these three topics is also summarised in this review. It is believed that our work will not only help new researchers quickly understand the state-of-the-art research on loosening, but also increase the knowledge of engineers on this critical subject. In the future, it is important to conduct more quantitative research on local slippage accumulation, and the relationship between local slippage accumulation and rotational loosening, which will have the potential to comprehensively unravel the loosening mechanism, and effectively guide the anti-loosening design of threaded fasteners.

show abstract

Section: Bending Vibration Loadingmentioning

confidence: 99%

Review of research on loosening of threaded fasteners

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Bolted flange connections commonly use M72 bolts and have been deployed since 2009 8 . However, this type of connection is vulnerable to loosening of nuts 9 under dynamic loads, and therefore may be a higher risk solution in seismic areas. Slip joint connections have been developed much more recently, 10,11 and deployed for the first time in 2020 12 .…”

Section: Introductionmentioning

confidence: 99%

Seismic excitation of offshore wind turbines and transition piece response

Hamilton

Abadie

2023

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

Expansion of the offshore wind industry in seismically active areas has raised concerns regarding the structural integrity of offshore wind turbines under earthquake loading. This paper details a 3D finite element study to investigate the behaviour of the structure, and in particular the transition piece (TP), under seismic loads. The work focuses on equivalent grouted connection and TP‐less designs, selected as promising design solutions for seismic zones. The numerical model is validated against a medium‐scale 4‐point bending laboratory test, and scaled up to a representative 8 MW turbine. The results show that cracking of the grout occurs due to earthquake excitation at the top of the TP; a location that is typically undamaged during monotonic loading. This can lead to excessive settlement of the transition piece and loss of axial capacity caused by deterioration of the grout‐steel bond and water ingress. The residual hub displacement after earthquake excitation is around 0.1 m. The global monotonic response post‐earthquake excitation is not significantly altered, with apparent stiffness and ultimate strength maintained. An equivalent TP‐less design is shown to have a 5% lower natural frequency than an equivalent grouted connection design, suggesting a reduced global stiffness, with reduced structural damping due to the absence of grout. However, TP‐less design eliminates the risk of grout deterioration and settlement and may therefore be a safer design option for offshore wind turbines installed in seismic zones in the future.

show abstract

“…In addition, external threads and bolt shank were modelled with hexahedral elements, and the bolt model was created by tying the external threads to the bolt shank. The nut model was similarly created using the same method [4,34,35] . An effective model, which can construct helical thread geometry, must be used to accurately capture the mechanical characteristics and self-loosening phenomena of bolted joints.…”

Section: Introductionmentioning

confidence: 99%

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

Liu

Ouyang

Feng

et al. 2017

Tribology International

View full text Add to dashboard Cite

Loosening tests of bolted joints are carried out under various preloads and excitation amplitudes. Three coatings are utilized to treat bolts, and their effects on the anti-loosening performance are studied. For the MoS 2 coated bolt, a reasonable preload is calculated, and its anti-loosening performance is also examined. It is found that the anti-loosening performance of MoS 2 coating on bolt is better than that of the other two coatings. Under the same equivalent stress as that of the uncoated bolt at the thread root, both the preload and the anti-loosening performance of the MoS 2 coated bolt are significantly greater. Additionally, a FE model is created to simulate the bolted joint, and very good agreement is found between numerical and experimental results.

show abstract

Bolt-Nut Loosening in Bolted Flange Connections Under Repeated Bending Moments

Cited by 8 publications

References 0 publications

Review of research on loosening of threaded fasteners

Review of research on loosening of threaded fasteners

Seismic excitation of offshore wind turbines and transition piece response

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

Contact Info

Product

Resources

About