In this paper, a novel criterion is developed for preventing the self-loosening of preloaded threaded cap screws under cyclic transverse loading. For a known cyclic excitation, the system parameters are used in the formulation of a closed form solution for the minimum fastener preload required for preventing self-loosening. The effect of several key variables is investigated; this includes bearing and thread friction coefficients, cap screw grip length, thread pitch, material, and cyclic amplitude of the transverse excitation. An experimental setup and test procedure are established. Comparison between the experimental and analytical clamp load variation results shows that the proposed criterion can accurately predict the requirements for preventing self-loosening.
Issue Section:
Research Papers
Keywords:
self-loosening,
criterion,
mathematical model,
threaded cap screws,
fasteners,
friction,
vibrations
1.
Junker
, G. H.
, 1969, “New Criteria for Self-Loosening of Fasteners Under Vibration
,” SAE Trans.
0096-736X, 78
, pp. 314
–335
.2.
Finkelston
, R. J.
, 1972, “How Much Shake Can Bolted Joints Take
,” Mach. Des.
0024-9114, 44
, pp. 122
–125
.3.
Hess
, D.
, 1998, “Vibration and Shock Induced Loosening
,” Handbook of Bolts and Bolted Joints
,” J. H.
Bickford
and S.
Nassar
, Dekker
, New York
, pp. 757
–824
.4.
Sakai
, T.
, 1978, ““Investigations of Bolt Loosening Mechanisms,” 1st Report: On Bolts of Transversely Loaded Joints
,” Bull. JSME
0021-3764, 21
, pp. 1385
–1390
.5.
Haviland
, G. S.
, 1983, “Designing With Threaded Fasteners
,” Mech. Eng. (Am. Soc. Mech. Eng.)
0025-6501, 105
, pp. 17
–31
.6.
Yamamoto
, A.
, and Kasei
, S.
, 1984, “A Solution for the Self-Loosening Mechanism of Threaded Fasteners Under Transverse Vibration
,” Bull. Jpn. Soc. Precis. Eng.
0582-4206, 18
, pp. 261
–266
.7.
Tanaka
, M.
, Hongo
, K.
, and Asaba
, E.
, 1982, “Finite Element Analysis of the Threaded Connections Subjected to External Loads
,” Bull. JSME
0021-3764, 25
, pp. 291
–298
.8.
Vinogradov
, O.
, and Haung
, X.
, 1989, “On a High Frequency Mechanism of Self-Loosening of Fasteners
,” Proceedings of the 12th ASME Conference on Mechanical Vibration and Noise
, Montreal, Quebec, Canada, pp. 131
–137
.9.
Jiang
, Y.
, Zhang
, M.
, and Lee
, C. H.
, 2003, “A Study of Early Stage Self-Loosening of Bolted Joints
,” ASME J. Mech. Des.
0161-8458, 125
, pp. 518
–526
.10.
Shoji
, Y.
, and Sawa
, T.
, 2005, “Analytical Research on Mechanism of Bolt Loosening Due to Lateral Loads
,” Proceedings of the ASME Pressure Vessels and Piping Conference
, Denver, CO, Jul. 17–21, Vol. 2
, PVP2005-71333, pp. 59
–65
.11.
Pai
, N. G.
, and Hess
, D. P.
, 2002, “Experimental Study of Loosening of Threaded Fasteners Due to Dynamic Shear Loads
,” J. Sound Vib.
0022-460X, 253
(3
), pp. 585
–602
.12.
Pai
, N. G.
, and Hess
, D. P.
, 2002, “Three-Dimensional Finite Element Analysis of Threaded Fastener Loosening Due to Dynamic Shear Load
,” Eng. Failure Anal.
1350-6307, 9
, pp. 383
–402
.13.
Nassar
, S. A.
, and Housari
, B. A.
, 2006, “Effect of Thread Pitch on the Self-Loosening of Threaded Fasteners Due to Cyclic Transverse Loads
,” ASME J. Pressure Vessel Technol.
0094-9930, 128
, pp. 590
–598
.14.
Nassar
, S. A.
, and Housari
, B. A.
, 2006, “Study of the Effect of Hole Clearance and Thread Fit on the Self-Loosening of Threaded Fasteners Due to Cyclic Transverse Loads
,” ASME J. Mech. Des.
0161-8458, 128
, pp. 586
–594
.15.
Housari
, B. A.
, and Nassar
, S. A.
, 2007, “Effect of Thread and Bearing Friction Coefficients on the Vibration-Induced Loosening of Threaded Fasteners
,” ASME J. Vibr. Acoust.
0739-3717, 129
, pp. 484
–494
.16.
Housari
, B. A.
, 2007, “Vibration-Induced Loosening of Threaded Fasteners
,” Ph.D. thesis, Oakland University, Rochester, MI.17.
Nassar
, S. A.
, and Yang
, X.
, 2009, “A Mathematical Model for Vibration-Induced Loosening of Preloaded Threaded Fasteners
,” ASME J. Vibr. Acoust.
0739-3717, 131
, p. 021009
.18.
Yang
, X. J.
, and Nassar
, S. A.
, “Analytical and Experimental Investigation of Self-Loosening of Preloaded Cap Screw Fasteners
,” ASME J. Vibr. Acoust.
0739-3717, in press.19.
Sopwith
, D. G.
, 1948, “The Distribution of Load in Screw Threads
,” Proc. Inst. Mech. Eng.
0020-3483, 159
(45
), pp. 373
–383
.20.
Englund
, R. B.
, and Johnson
, D. H.
, 1997, “Finite Element Analysis of a Threaded Connection Compared to Experimental and Theoretical Research
,” Journal of Engineering Technology
0747-9964, 14
(2
), pp. 42
–47
.21.
Nassar
, S. A.
, Ganeshmurthy
, S.
, Ranganathan
, R. M.
, and Barber
, G. C.
, 2007, “Effect of Tightening Speed on the Torque-Tension and Wear Pattern in Bolted Connections
,” ASME J. Pressure Vessel Technol.
0094-9930, 129
, pp. 426
–440
.22.
Nassar
, S. A.
, and Yang
, X.
, 2007, “Novel Formulation on the Break-Away Torque Components and the Torque-Tension Relationship in Threaded Fasteners
,” ASME J. Pressure Vessel Technol.
0094-9930, 129
, pp. 653
–663
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