Journal of Failure Analysis and Prevention

, Volume 15, Issue 5, pp 672–678 | Cite as

Sensitivity Analysis of Mission Critical Shear Bolts of Combat Aircraft High-Speed Flexible Coupling

  • S. Nagesh
  • A. M. Junaid Basha
  • Dineshsingh G. Thakur
Technical Article---Peer-Reviewed


The combat aircraft utilizes high-speed flexible coupling (HSFC) to transmit the power from the aircraft engine gear box to accessory gearbox and to accommodate misalignment arises in the drive line. The HSFC input drive end has three shear bolts with predetermined shear torque set value. The mission-critical shear bolt failure to act above maximum set value will damage the down-line components by excess torque transmission. The premature action of shear bolts below minimum set value will deprive the power to single-engine aircraft transmission which may even lead to loss of aircraft. To realize consistency performance of shear bolts, sensitivity analysis is carried out considering influencing parameters like shear section size, hardness and preload variation. Based on the analysis, grouping of bolts was enabled for consistent performance in shear torques. The experimental validations are carried out to correlate between theoretical prediction and model behavior.


Bolted joints Shear section Tightening torque Sensitivity analysis Experimental validation 


  1. 1.
    M. Calistrat, Metal Diaphragm Coupling Performance, in Proceedings of the Fifth Turbomachinery Symposium, 1976, pp. 117–124Google Scholar
  2. 2.
    S. Nagesh, A.M. Junaid Basha, G. Thakur Dinesh Singh, Influence of applied misalignment on the balanced high speed flexible coupling of fighter aircraft. Appl. Mech. Mater. 592–594, 1084–1088 (2014)CrossRefGoogle Scholar
  3. 3.
    S. Nagesh, A.M. Junaid Basha, G. Thakur Dinesh Singh, Dynamic performance analysis of high speed flexible coupling of gas turbine engine transmission system. J. Mech. Sci. Technol. 29(1), 173–179 (2015)CrossRefGoogle Scholar
  4. 4.
    R.P. Czachor, Unique challenges for bolted joint design in high-bypass turbo-fan engines. J. Eng. Gas Turbines Power 127(2), 240–248 (2005)CrossRefGoogle Scholar
  5. 5.
    J. Yoo, S.-J. Hong, J.S. Choi, Y.J. Kang, Design guide of bolt locations for bolted-joint plates considering dynamic characteristics. Proc. Inst. Mech. Eng. Part C J. Mech. Eng. Sci. 223(2), 363–375 (2009)CrossRefGoogle Scholar
  6. 6.
    S. Melenciuc, V. Venghiac, Factors influencing the preload level of high strength bolts for structural steel connections. Rep. Gheorghe Asachi Tech. Univ. Iasi, Fac. Civ. Eng. Build. Serv., No. Lxi, 125–138 (2011)Google Scholar
  7. 7.
    W. Eccles, I. Sherrington, R.D. Arnell, Frictional changes during repeated tightening of zinc plated threaded fasteners. Tribol. Int. 43(4), 700–707 (2010)CrossRefGoogle Scholar
  8. 8.
    T. Fukuoka, T. Takaki, Elastic plastic finite element analysis of bolted joint during tightening process. J. Mech. Des. 125(4), 823–830 (2003)CrossRefGoogle Scholar
  9. 9.
    B.S.C. Ranjan, H.N. Vikranth, A. Ghosal, A novel prevailing torque threaded fastener and its analysis. J. Mech. Des. 135(10), 1010071–1010079 (2013)CrossRefGoogle Scholar
  10. 10.
    D. Doyle, A. Zagrai, B. Arritt, H. Cakan, Damage detection in bolted space structures. J. Intell. Mater. Syst. Struct. 21(3), 251–264 (2009)CrossRefGoogle Scholar
  11. 11.
    N. Pai, D. Hess, Three-dimensional finite element analysis of threaded fastener loosening due to dynamic shear load. Eng. Fail. Anal. 9, 383–402 (2002)CrossRefGoogle Scholar
  12. 12.
    R.A. Ibrahim, C.L. Pettit, Uncertainties and dynamic problems of bolted joints and other fasteners. J. Sound Vib. 279(3–5), 857–936 (2005)CrossRefGoogle Scholar
  13. 13.
    Specification for 1½ per cent nickel-chromium-molybdenum steel (90/110 kgf/mm2 (57/70 tonf/in2): limiting ruling section 150 mm (6 in) BS 3S 95:1967, British Standards InstitutionGoogle Scholar
  14. 14.
    ASM International, ASM Handbook Volume 4: Heat Treating. (ASM International, 1991)Google Scholar
  15. 15.
    J.H. Bickford, Introduction to the Design and Behavior of Bolted Joints: Non-Gasketed Joints, 4th edn. (CRC Press, Boca Raton, 2007), p. 568CrossRefGoogle Scholar
  16. 16.
    R. Budynas, K. Nisbett, Shigley’s Mechanical Engineering Design (McGraw-Hill Education, New York, 2010), p. 1120Google Scholar
  17. 17.
    J. Gere, B. Goodno, Mechanics of Materials, SI edn. (Cengage Learning, Boston, 2012), p. 1056Google Scholar
  18. 18.
    G.E. Dieter, Mechanical Metallurgy (McGraw-Hill, London, 1988), p. 751Google Scholar
  19. 19.
    G.L. Kulak, J.W. Fisher, J.H.A. Struik, Guide to Design Criteria for Bolted and Riveted Joints (Wiley, New York, 1987), p. 333Google Scholar

Copyright information

© ASM International 2015

Authors and Affiliations

  • S. Nagesh
    • 1
  • A. M. Junaid Basha
    • 1
  • Dineshsingh G. Thakur
    • 2
  1. 1.Combat Vehicles Research and Development EstablishmentDRDOChennaiIndia
  2. 2.Department of Mechanical EngineeringDefence Institute of Advanced TechnologyPuneIndia

Personalised recommendations