Evaluating long-term relaxation of high strength bolts considering coating on slip faying surface

Nah, Hwan-Seon; Lee, Hyeon-Ju; Choi, Sunghee

doi:10.12989/scs.2014.16.6.703

Cited by 9 publications

(1 citation statement)

References 6 publications

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“…Yu et al (2022) studied the loosening and fatigue fracture of mixed thread connections with different materials under cyclic load through experimental and numerical simulation methods. Nah et al (2014) experimentally studied the influence of thread surface coating thickness and coating type on thread relaxation after clamping. Yang and Nassar (2011) proposed a thread self-loosening model under load through experiments and theoretical analysis.…”

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Experimental and numerical simulation study on coupling tripping of partial trapezoidal threaded casing head and casing coupling

Zhang,

Ding,

et al. 2024

Front. Mater.

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Casing connection is a common connection method in oil and gas reservoir production, and the tripping of casing will seriously hinder the production process. To study the casing tripping process and the minimum tensile load required for casing tripping under different loosening buckle states, three kinds of casing tripping tensile tests were carried out. The thread morphology of the casing head and casing coupling was analyzed by local cutting at the end of the experiment, and the thread failure area was analyzed by scanning electron microscope, and then other loosening states were studied and analyzed using numerical simulation. The research results show that as the number of loosening buckles increases, the minimum tensile load required for the casing head and casing coupling to trip decreases. The observation of the thread shape shows that the thread part of the casing head was seriously damaged. Scanning electron microscopy results show that the fracture mode at the thread of the casing head is ductile fracture. Numerical simulation results show that the maximum stress area during the tripping process is at the contact position between the thread heads. Based on the experimental and numerical simulation results, the relationship between the number of casing loosening and the minimum tensile load required for casing tripping is obtained. The research results can be used as the experimental and theoretical basis for the investigation of casing tripping accidents and can also provide experimental reference for the design of the next-generation of casing.

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confidence: 99%

Experimental and numerical simulation study on coupling tripping of partial trapezoidal threaded casing head and casing coupling

Zhang,

Ding,

et al. 2024

Front. Mater.

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01.30: Evaluation on clamping load of high strength bolts under ambient environment

Nah

Choi

2017

ce papers

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The torque shear type high strength bolt is clamped in general when pin-tail of shank is cut off. However the clamping loads of high strength bolt did not often meet the required tension due to variation of torque coefficient. This is why the viscosity of lubricant on bolt shank affects the torque coefficient by temperature, dust and debris. In this study, the clamping tests of various high strength bolts were performed independently both at indoor condition and at construction sites for six years. The temperature of construction sites was recorded with the range from -11℃ to 34℃.. The temperature at indoor condition was set up to compose from -10℃ to 50℃ at each 10℃ interval. At construction sites, the clamping load of high strength bolt was varied from 159 to 210 kN and the torque value was varied from 405 to 556 Nm. The torque coefficients at construction sites were analyzed from 0.126 to 0.158 whereas tensions were measured from 179 to 192 kN by using tension meter. The torque coefficients at construction sites were analyzed to range from 0.118 to 0.152. From these tests, the diverse equations on torque coefficient, tension subjected to temperature were taken by statistic regressive analysis.

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Shake Table Tests to Examine the Seismic Performance of Prefabricated Steel Unit Houses

Matsuda

Okazaki

Nagae

et al. 2022

Lecture Notes in Civil Engineering

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Evaluating long-term relaxation of high strength bolts considering coating on slip faying surface

Cited by 9 publications

References 6 publications

Experimental and numerical simulation study on coupling tripping of partial trapezoidal threaded casing head and casing coupling

Experimental and numerical simulation study on coupling tripping of partial trapezoidal threaded casing head and casing coupling

01.30: Evaluation on clamping load of high strength bolts under ambient environment

Shake Table Tests to Examine the Seismic Performance of Prefabricated Steel Unit Houses

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