An investigation on the anti-loosening characteristics of threaded fasteners under vibratory conditions

Bhattacharya, Anirban; Sen, Avijit; Das, Santanu

doi:10.1016/j.mechmachtheory.2008.08.004

Cited by 69 publications

(46 citation statements)

References 2 publications

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“…However, the chemical adhesive techniques have some difficulties in being applied to a subminiature-sized bolt due to a dimensional inaccuracy. Many studies have been carried out to improve the joining or anti-releasing torque, [5][6][7][8][9][10][11]. Min et al [5] and Lee et al [6] evaluated the effect of thread angle and bit depth, respectively, on joining performance.…”

Section: Introductionmentioning

confidence: 99%

“…Sase et al [7,8] measured the anti-loosening performance of screw threads, spring washers, nylon-inserted nuts, double nuts, and eccentric nuts under vibratory conditions. Bhattacharya et al [9] also tested the anti-loosening characteristics of various types of fasteners under vibratory conditions. They showed the serrated bolt has a good anti-loosening performance together with the chemical lock bolt.…”

Section: Introductionmentioning

confidence: 99%

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An investigation into the anti-releasing performance of a serrated bolt

et al. 2015

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As the sizes of electric products, such as mobile phones and watch phones, decrease, the joining bolt for the electric product should also be miniaturized. However, the miniature-sized bolt has to support sufficient joining torque and joining force. The bolt also has to support sufficient anti-releasing torque to keep the product fastened. We investigated a serrated bolt as a candidate for a miniature-sized fastener to increase the anti-release torque. In the serrated bolt, serration shapes are formed on the bottom surface of a bolt head to create an obstacle to releasing. In this study, finite element analyses were carried out on joining and releasing, and the anti-release torque was predicted. Through the joining and releasing analyses for various values of the elastic modulus and yield strength of the joined part, the effect of the mechanical properties of the joined part on the anti-releasing performance were investigated. The analysis results showed that a high strength insert nut is needed to increase the anti-releasing torque when the yield strength of the joined part is low, such as a plastic board in a mobile phone.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An investigation into the anti-releasing performance of a serrated bolt

et al. 2015

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“…They showed that loosening behavior of nut bolt joint shows the same occurrence if the transverse load applied in the opposite direction and when transverse cyclic load applied to the joint, bolt axial tension slowly decreases and at the worst stage not only loosening occurs but bolt fails in fatigue also. In their work, Bhattacharya et al [3] have made an attempt to test the anti-loosening ability of various locking screw fasteners with bolts of different materials, sizes and types with different initial clamping forces under the accelerated vibrating conditions in an indigenously made testing rig. They found that the loss of clamping force gives an indication of the extent of loosening.…”

Section: Introductionmentioning

confidence: 99%

Role of Washers in Controlling Loosening of Full Threaded Bolted Joints

Dravid

Tripathi²,

Chouksey³

2014

Procedia Technology

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Bolted joints are used for fastening components together in the industry, aeronautics and in railways. These joints may get loose with time and if not attended timely may result in catastrophic failure also. The purpose of this study was to examine the effect of tightening torque on loosening. For this purpose tests were conducted using three different tightening torque values, in the vicinity of rated torque. Washers of different types are used in bolted joint, with an understanding that they prevent or retard loosening. This study also attempts to examine the role of two types of most commonly used washers: the plain washer and the spring washer. Trials were also performed on joint without any washer, for the sake of comparison of loosening performance of the joint. The results of this experimental study are shown in terms of starting point of loosening of joint and rate of loosening of the joint. Various combinations of washers for three values of tightening torque are considered in the experimental study. The results are useful in understanding the role of type of washer in prevention of loosening of the bolted joint.

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“…The friction locking approach is one of three basic locking fastener categories established by major companies [12,13]. The mechanism of friction locking is to enhance the friction force by increasing the bearing load or the friction coefficients of contact surfaces of nut or bolt head and thread.…”

Section: Introductionmentioning

confidence: 99%

An Analytical Model for Rotation Stiffness and Deformation of an Antiloosening Nut under Locking Force

Jiang

Hong

Shao

et al. 2014

International Journal of Rotating Machinery

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Screw fasteners are undoubtedly one of the most important machine elements due to their outstanding characteristic to provide a high clamping force just with a simplified design. However, the loosen vibration is their inherent and inevitable fault. The friction locking approach is one of the basic locking fastener categories by enhancing the bearing load on the contact surface of thread by applying a locking force on an antiloosening nut. This locking force may cause more severe deformation in the nut. The contact stress distribution on the nut would be changed and that can cause the variation of the friction torque for the bolt joint. However, there exists no established design calculation procedure that accounts for the rotation deformation and its stiffness of the antiloosening nut under the locking force. The main objective of the work is to develop an analytical solution to the rotation deformation problem encountered in the antiloosening nut. The proposed model is supported by comparison with numerical finite element analysis of different sizes of joint elements and different applied forces.

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An investigation on the anti-loosening characteristics of threaded fasteners under vibratory conditions

Cited by 69 publications

References 2 publications

An investigation into the anti-releasing performance of a serrated bolt

An investigation into the anti-releasing performance of a serrated bolt

Role of Washers in Controlling Loosening of Full Threaded Bolted Joints

An Analytical Model for Rotation Stiffness and Deformation of an Antiloosening Nut under Locking Force

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