Investigation of thermal cycle effect prior to cyclic loading on fatigue life of interference fitted specimens and fatigue life prediction

Document Type : Research Article

Authors

The Faculty of Mechanical Engineering, University of Tabriz

Abstract

Interference fit process, as a popular method, is used in aerospace and automotive industries to improve fatigue life of the joints. Investigating studies on interference fit process demonstrates that the effect of temperature variations has not been studied as an effective factor on fatigue life. In the present study, the effect of short time exposure to thermal cycle before cyclic loading on fatigue life of interference fitted fastener holes have been evaluated by experimental and numerical methods. So, to investigate the effect of temperature variations two different temperatures (i.e. 60°C and 120°C), aside from room temperature, were selected to accomplish this study. Fatigue tests were carried out on the specimens of Al-alloy 7075-T6 to obtain S-N curves. In relation to fatigue tests, three dimensional finite element analyses were used to explain the experimental results. The interference fit process, and subsequent thermal cycles and remote cyclic loading were simulated using Ansys package. The results obtained from the finite element analyses of the interference fit were employed to predict the fatigue life.

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References

[1]T. Chakherlou, M. Mirzajanzadeh, J. Vogwell, Experimental and numerical investigations into the effect of an interference fit on the fatigue life of double shear lap joints, Engineering Failure Analysis, Vol. 16, No. 7, pp. 2066-2080, 2009.
[2]A. Lanciotti, C. Polese, The effect of interference-fit fasteners on the fatigue life of central hole specimens, Fatigue & Fracture of Engineering Materials & Structures, Vol. 28, pp. 587-597, 2004.
[3]T. Chakherlou, J. Vogwell, The effect of cold expansion on improving the fatigue life of fastener holes, Engineering failure analysis, Vol. 10, No. 1, pp. 13-24, 2003.
[4]T.N. Chakherlou, J. Vogwell, A novel method of cold expansion which creates near uniform compressive tangential residual stress around a fastener holes, Fatigue & Fracture of Engineering Materials & Structures, Vol. 27, pp. 343–351, 2004.
[5]T. Chakherlou, B. Abazadeh, J. Vogwell, The effect of bolt clamping force on the fracture strength and the stress intensity factor of a plate containing a fastener hole with edge cracks, Engineering Failure Analysis, Vol. 16, No. 1, pp. 242-253, 2009.
[6] T.N. Chakherlou, H. Taghizadeh, M. Mirzajanzadeh, A.B. Aghdam, On the prediction of fatigue life in double shear lap joints including interference fitted pin,, Engineering Fracture Mechanic, Vol. 96, No. 7, pp. 340-354, 2012.
[7]T.N. Chakherlou, H. Taghizadeh, A,B. Aghdam, Experimental and numerical comparison of cold expansion and interference fit methods in improving fatigue life of holed plate in double shear lap joints, Aerospace Science and Technology,Vol. 29, pp. 351–362, 2013.
[8]D.A. Clark, W.S. Johnson, Temperature effects on fatigue performance of cold expanded holes in 7050-T7451 aluminum alloy, International Journal of Fatigue, Vol. 25, pp. 159–65, 2003.
[9]J.M. Minguez, J. Vogwell, Fatigue life of an aerospace aluminum alloy subjected to cold expansion and a cyclic temperature regime. Engineering Failure Analysis, Vol. 13, No. 6, pp. 997-1004, 2006.
[10]I.J. Polmear, G. Pons, H. Octor, C. Sanchez, A. Morton, W. Borbridge, After Concorde: evaluation of an Al–Cu–Mg–Ag alloy for use in the proposed European SST, Material Science Forum,Vol. 12, pp. 217–222, 1996.
[11]ANSYS Release 12.0 Documentation, ANSYS Inc., 2008.
[12]X. Yuan, Z.F. Yue, S.F. Wen, L. Li, T. Feng. Numerical and experimental investigation of the cold expansion process with split sleeve in titanium alloy TC4, International Journal of Fatigue; Vol. 77, pp. 78–85, 2015.
[13] W.Guo; Elastic-plastic analysis of a finite sheet with a cold-worked hole, Engineering. Fracture Mechanic, Vol. 46, pp. 465-472, 1993.
[14] A.T. Özdemir, L. Edwards, Through-thickNess residual stress distribution after the cold expansion of fastener holes and its effect on fracturing, ASME Journal Engineering Material Technology, Vol. 126, pp. 129–35, 2004.
[15]Royster DM. Tensile properties and creep strength of three aluminum alloys exposed up to 25000 hours  at  200–400 F.  Langley  Station,  Hampton  VA: Langley Research Center; 1969 [January, NASA TN D-5010].
[16]Stowell EZ. A phenomenological relation between stress, strain rate and temperature for metals at elevated temperature. Langley Field, VA: Langley Aeronautical Laboratory, National Advisory Committee for Aeronautics; 1957.
[17]Metals handbook. 10th ed., vol. 2. Properties and selection: nonferrous alloys and special-purpose materials. ASM International; 1990.
[18]R. Dhamari, The effect of water-displacing corrosion preventives on the fatigue behaviour of mechanically fastened aluminium joints. Ph.D. Thesis, University of New South Wales, 2004.
[19]J.P. Gallagher, F.J. Giessler, A.P. Berens, R. M. Jr. Engle, guidelines for the analysis and design of damage tolerant aircraft structures, USAF Damage Tolerant Design Handbook, 1984.
[19]A. Fatemi, D.F. Socie, A critical plane approach to multiaxial fatigue damage including out of phase loading, Fatigue Fracture Engineering of Materials Structures, Vol.11, pp.149–65, 1988.
[20] J.A. Harter, AFGROW version4.0009.12, AFRL-VASM 2004.
Amirkabir Journal of Mechanical Engineering
Volume 51, Issue 3
July and August 2019
Pages 1-10

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