Methodology for evaluating the tightening torque-clamping force relationship and friction coefficients in bolted joints

Lee, Jongmin; Kim, Damhyun; Seok, Chang-Sung

doi:10.1007/s12206-022-0328-y

Cited by 7 publications

(2 citation statements)

References 20 publications

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“…However, they have some pros and cons regarding the consistency of the clamping force, and the characteristics and the differences in the clamping force of these methods were evaluated in [14]- [16]. Lee et al [17] developed a testing device for investigating the torque/clamping force relationship for M14x1.5 steel bolts, and their results showed excellent correlation with the actual measurements. According to ISO 16047, the nut coefficient is one of the approaches used to evaluate the fasteners' torque/clamping force relationship.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effect of the Surface Treatment and Lubrication During Repeated Tightening on the Nut Coefficient of a Bolted Joint Using the Taguchi Method

2024

jjmie

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Bolted joints are used extensively in mechanical engineering due to their reusability, appearance, and strength advantages. In different industrial applications, the separated mechanical components are clamped together during the assembly using a tightening process. Estimating precisely the initially achieved clamping force is a persistent problem for providing a secure and reliable connection for a particular design. However, the nut coefficient is one of the exploratory methods used for this purpose. This paper aims to investigate how the nut coefficient of a bolted joint is influenced by factors such as bolt/nut surface treatment and the presence of lubrication at joint contact surfaces throughout the cyclic joint assembly/disassembly process, serving as a simulation for real-life maintenance operations where the same bolt/nut are reused. Torquing cycles were introduced to bolted joints with two surface finishes and four lubrication conditions. The experiments were conducted on bolts at room temperature according to ISO16047. The nut coefficient was calculated for bolt sizes M6*1, M8*1.5, and M10*1.5. The results were analyzed using the analysis of variance and Taguchi method L32 for estimating the contribution of the different factors on the nut coefficient. It was found that the lubrication was the most significant parameter affecting the nut factor regardless of the bolt size. Also, a case study was conducted to investigate the underlying reasons behind the significance of lubrication in influencing the nut coefficient across different bolt sizes.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Effect of the Surface Treatment and Lubrication During Repeated Tightening on the Nut Coefficient of a Bolted Joint Using the Taguchi Method

2024

jjmie

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“…Many studies have shown that the residual pretightening force loss of bolts is affected by different tightening methods, vibration during assembly and creep effects. Lee et al (2022) studied the friction coefficient between the contact surfaces through the detailed analysis of the torque theoretical formula and combined with experiments, and obtained the relationship between the input torquesclamping force and friction coefficient. Through this method, the accuracy of bolt clamping force evaluation is improved.…”

Section: Introductionmentioning

confidence: 99%

General prediction model of residual pretightening force of bolt group with one-step and multi-step pretightening and analysis of influencing factors from the perspective of elastic interaction

Pan

Sun

et al. 2023

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PurposeThe purpose is to predict the distribution of the residual pretightening force of the bolt group under the action of any initial pretightening force, and to achieve the final residual pretightening force as the target to solve the initial pretightening force value to be applied.Design/methodology/approachBased on the finite element method and the elastic interaction theory between bolt group, this paper establishes a prediction model for the residual pretightening force distribution of bolt group for one-step pretightening and multi-step pretightening of gasketless flange connection systems. In addition, using the general modeling method given in this paper, the prediction model of residual pretightening force of long plate bolt connection system is established, and compared with reference, which fully proves the effectiveness and universality of the general prediction model of residual pretightening force of bolt group.FindingsThe appropriate pretightening sequence, increasing the number of pretightening steps and variable amplitude loading can effectively reduce the influence of elastic interaction and improve the uniformity of residual pretightening force of the bolt group. And the selection of material, number of bolts and connected thickness of bolt connection system also has a great influence on the distribution of residual pretightening force of bolt groups.Originality/valueThe general prediction model for the residual pretightening force of bolt group of connecting structural components considering elastic interaction given in this paper can provide a reference for the design and optimization of the bolt assembly process of the rotor system and the casing system in aero-engine and the prediction of the performance of the connecting system.

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Nonlinear bonding analysis of bolt connection and secondary tightening strategy

Qiao,

Zhao,

et al. 2024

Int J Interact Des Manuf

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Methodology for evaluating the tightening torque-clamping force relationship and friction coefficients in bolted joints

Cited by 7 publications

References 20 publications

Investigation of the Effect of the Surface Treatment and Lubrication During Repeated Tightening on the Nut Coefficient of a Bolted Joint Using the Taguchi Method

Investigation of the Effect of the Surface Treatment and Lubrication During Repeated Tightening on the Nut Coefficient of a Bolted Joint Using the Taguchi Method

General prediction model of residual pretightening force of bolt group with one-step and multi-step pretightening and analysis of influencing factors from the perspective of elastic interaction

Nonlinear bonding analysis of bolt connection and secondary tightening strategy

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