Finite Element Simulation of Process Control for Bolt Tightening in Joints With Nonparallel Contact

Ganeshmurthy, Saravanan; Nassar, Sayed A.

doi:10.1115/1.4025830

Cited by 27 publications

(14 citation statements)

References 14 publications

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“…Furthermore, the control of torque coefficient and some key engineering problems about bolted connections were also discussed. Ganeshmurthy and Nassar 12 presented a precise method to establish bolt and nut models, taking into account the helix angle of threads. The 3D finite element analysis was conducted to simulate and evaluate different process control methods that are commonly used for automating the assembly of bolted joints in a mass production environment.…”

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confidence: 99%

Finite element analysis of relationship between tightening torque and initial load of bolted connections

Zhou

Wang

2015

Advances in Mechanical Engineering

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Proper initial load is necessary to ensure the stability of the bolted connections. In order to apply appropriate torque, the relationship between tightening torque and initial load should be determined. In this study, a detailed threedimensional finite element model of bolted joints was established with consideration of helix angle, pitch, thread type, tooth-type angle, and other details. The process of pre-tightening of bolted joints was simulated to validate the finite element model. The curves for the relationship between the torque and initial load obtained from finite element analysis agree well with those calculated from theoretical equations. Then, the influence of the friction coefficient, pitch, elastic modulus, assembly clearance, and strain-hardening exponent on the relationship was studied. The results show that the friction coefficient between nut and joint has great influence on the relationship between torque and initial load, that is, the larger the friction coefficient, the smaller the initial load of bolt at the same tightening torque. In contrast, the pitch, assembly clearance, Young's modulus, and strain-hardening exponent have little influence on torque-initial load relation. The method used in this study provides a theoretical basis for accurately determining the tightening torque for bolted joints. Bolted joints are widely used in mechanical structures as they are easy to be assembled and disassembled. Threaded joints must be tightened when installed so that the connected components are compressed while the bolt is stretched. The force acting on the bolt introduced by pre-tightening is named initial load. Keywords1 The purpose of pre-tightening is to strengthen reliability and compactness of the connections. However, an excessive initial load will lead to yield and even fracture in the bolt; on the other hand, an insufficient initial load cannot provide the adequate clamping force which is required for maintaining the integrity of the joint and eventually causes structure loosening and failure. So, determining an appropriate initial load is quite important for bolted connections. It is hard to measure the initial load during the assembly process, so the common practice is using torque wrench to regulate the tightening torque. Thus, determining the relationship between the tightening torque and initial load is of remarkable significance in maintaining the reliability of the bolted joints.

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confidence: 99%

Finite element analysis of relationship between tightening torque and initial load of bolted connections

Zhou

Wang

2015

Advances in Mechanical Engineering

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“…In this study, a three-dimensional (3D) finite element model of a typical bolted joint structure is built, and the torque control strategy by directly applying a moment to the nut is simulated. [14][15][16] Then, the effective bearing contact radius is calculated based on the FEA results of bearing pressure distribution…”

Section: Methodsmentioning

confidence: 99%

Calculation of the effective bearing contact radius for precision tightening of bolted joints

Gong

Liu

Ding

2016

Advances in Mechanical Engineering

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Torque control is usually the only method for tightening bolts in some precision assembly applications. However, the scatter of the torque-tension relationship may significantly decrease the accuracy of the preload, which conflicts with the high requirement for mechanical accuracy in such precision assemblies. An important, but often ignored, factor affecting the accuracy of the torque-tension relationship is the effective bearing contact radius. In this article, a threedimensional finite element model of a typical bolted joint was developed to obtain the actual bearing pressure distribution, based on which the effective bearing contact radius can be further calculated. Then, a parametrical study was conducted to systematically investigate the effects of various geometrical, material, and frictional factors on the effective bearing contact radius. Based on the numerical results, a comprehensive and quantitative evaluation of the relative accuracy of each traditional method of calculating the effective bearing contact radius was made. In particular, it was found that the effective bearing contact radius, calculated based on the assumption of uniform bearing pressure distribution, was always relatively accurate regardless of the geometrical, material, and frictional conditions considered. This study will be helpful in increasing the accuracy of preload, thus ensuring mechanical accuracy and quality for precision assemblies.

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“…To assure the strength connection throughout the life length of a car, critical issues must be developed not only to the design of the joint but also to the assembly operation (Hermansson, 2016). Screw connection is one of the most prevalent connection method in the assembly industry, in which impact wrench plays an important role (OGAWA et al, 2015;GANESHMURTHY;NASSAR, 2014;WOLF;LORENZ, 2011).…”

Section: Theoretical Framementioning

confidence: 99%

Screw torque traceability control: industrial application

Silva

Uhlmann

Frazzon

2020

Ind. Jour. Manag. & Prod.

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This paper analyses a new screw torque traceability control procedure designed for an operation in a car audio workstation. First the detection score at a Failure Mode and Effects Analysis (FMEA) indicated which process improvement were needed. On the sequence, data was collected to evaluate performance indicators. Finally, specific actions were executed based on the improvement plan. As result, the FMEA detection score improved from 7 to 3, the run rate increased from 12 to 16 products/h and defects caused by improper screwing were eliminated. This research contributes to disseminate a practical application of a screw torque traceability control.

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Finite Element Simulation of Process Control for Bolt Tightening in Joints With Nonparallel Contact

Cited by 27 publications

References 14 publications

Finite element analysis of relationship between tightening torque and initial load of bolted connections

Finite element analysis of relationship between tightening torque and initial load of bolted connections

Calculation of the effective bearing contact radius for precision tightening of bolted joints

Screw torque traceability control: industrial application

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