Certificate of Registration Media number Эл #ФС77-53688 of 17 April 2013. ISSN 2308-6033. DOI 10.18698/2308-6033
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Stress relaxation in radial interference-fit bolted-type connections

Published: 24.10.2019

Authors: Buketkin B.V., Semenov-Ezhov I.E., Shirshov A.A.

Published in issue: #10(94)/2019

DOI: 10.18698/2308-6033-2019-9-1928

Category: Mechanics | Chapter: Dynamics, Strength of Machines, Instruments, and Equipment

In modern airplanes design, radial interference-fit bolted-type connections are widely used as an effective means of increasing life of an airframe. Due to the assembly in the vicinity of the hole of the connected elements, i.e. package, of aluminum alloys, a stress field is formed, stresses exceeding the yield strength of the material. For such materials, at stresses close to the yield strength even at a temperature of 20±3 °C, creep strains arise, which after a few hundred hours reach values that commensurate with elastic strains. As a result of this, a noticeable decrease in stresses in the connection occurs. Within the research, we studied the effect of the creep process on the redistribution of stresses in the aluminum alloy package after a steel bolt was pressed into it. We used one of the technical creep theories — flow theory. A single-row bolted-type connection with various values of the nominal radial interference was considered. The calculations were performed numerically by the finite element method using the ANSYS Academic application package. Graphs of changes in the main stresses over time (up to 2400 hours), as well as the dependences of equivalent stresses and contact pressure on the nominal interference (up to 1.2%) are given.

[1] Mann J.Y., Machin A.S., Lupson W.F., Pell R.A. The use of interference-fit bolts or bushes and hole cold expansion for increasing the fatigue life of thick-section aluminium alloy bolted joints. Aeronautical Research Labs Melbourne (Australia), 1983, no. Arl/Structures Note-490.
[2] Buhr K., Haydn W., Bacher-Hoechst M., Wuttre U., Berger Ch. Finite-element-based methods for the fatigue design of bolts and bolted joints. SAE International Journal of Materials and Manufacturing, 2009, vol. 2, no. 1, pp. 75–84.
[3] Cemenov-Ezhov I.E., Shirshov A.A. Izvestiya vysshikh uchebnykh zavedeniy. Mashinostroenie — Proceedings of Higher Educational Institutions. Маchine Building, 2015, no. 7, pp. 29–33.
[4] Rabotnov Yu.N. Polzuchest elementov konstruktsii [Creep of structural elements]. 2nd ed., reprint. Moscow, Nauka Publ., 2014, 752 p.
[5] Cemenov-Ezhov I.E., Shirshov A.A. Tpudy MVTU. No. 332. Dinamika i prochnoct mashin [BMHTS Proceedings. Dynamics and machine performance]. Moscow, BMSTU Publ., 1980, pp. 138–145.
[6] Bouzid A., Chaaban A. An accurate method of evaluating relaxation in bolted flanged connections. Journal of Pressure Vessel Technology, 1997, vol. 119, no. 1, pp. 10–17.
[7] Nechache A., Bouzid A. H. Creep analysis of bolted flange joints. International Journal of Pressure Vessels and Piping, 2007, vol. 84, no. 3, pp. 185–194.
[8] Bouzid A.H., Nechache A. Creep modeling in bolted flange joints. In: ASME/JSME 2004 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers Digital Collection, 2008, pp. 49–56.
[9] Chen Y., Xu Y.Y., Huang L.Y., Xu Y.H., Guan K. Creep behavior of metal-to-metal contact bolted flanged joint. Procedia Engineering, 2015, vol. 130, pp. 214–220.
[10] Yang J., DeWolf J.T. Mathematical model for relaxation in high-strength bolted connections. Journal of Structural Engineering, 1999, vol. 125, no. 8, pp. 803–809.
[11] Gaffanov R.F. Intellektualnye sistemy v proizvodstve. Nauchno-prakticheskiy zhurnal — Intelligent Systems in Manufacturing, 2008, no. 2 (12), pp. 148–153.
[12] [Morozov A.V., Fedotov G.D., Abramov A.E. Vestnik Ulyanovskoy gosudarstvennoy selskokhozyaystvennoy akademii — Vestnik of Ulyanovsk State Agricultural Academy, 2014, no. 3 (27), pp. 125–133.
[13] Bulanov V.B., Buketkin B.V., Semenov-Ezhov I.E., Shirshov A.A. Zavodskaya laboratoriya. Diagnostika materialov — Industrial Laboratory. Diagnostics of Materials, 2014, vol. 80, no. 6, pp. 59–62.
[14] Chigarev A.V. Kravchuk A.S., Smalyuk A.F. ANSYS dlya inzhenerov [ANSYS for engineers]. Moscow, Mashinostroenie-1 Publ., 2004, 524 p.
[15] ANSYS Academic Research, Release 17.0, Help System. Mechanical ADPl Guide, ANSYS, Inc.
[16] Dunaev V.V., Cemenov-Ezhov I.E., Shirshov A.A. Vestnik mashinostroeniya — Russian Engineering Research, 2001, no. 12, pp. 21–24.