Stress Analysis of Adhesively Bonded Double- Lap Joints Subjected to Combined Loading

Authors: Solyman Sharifi, Naghdali Choupani

Abstract:

Adhesively bonded joints are preferred over the conventional methods of joining such as riveting, welding, bolting and soldering. Some of the main advantages of adhesive joints compared to conventional joints are the ability to join dissimilar materials and damage-sensitive materials, better stress distribution, weight reduction, fabrication of complicated shapes, excellent thermal and insulation properties, vibration response and enhanced damping control, smoother aerodynamic surfaces and an improvement in corrosion and fatigue resistance. This paper presents the behavior of adhesively bonded joints subjected to combined thermal loadings, using the numerical methods. The joint configuration considers aluminum as central adherend with six different outer adherends including aluminum, steel, titanium, boronepoxy, unidirectional graphite-epoxy and cross-ply graphite-epoxy and epoxy-based adhesives. Free expansion of the joint in x direction was permitted and stresses in adhesive layer and interfaces calculated for different adherends.

Keywords: Thermal stress, patch repair, Adhesive joint, Finiteelement analysis.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1330611

References:

[1] A. J. Kinloch, Adhesion and Adhesives: Science and Technology: Chapman and Hall, 1987.
[2] A. Baldan, "Adhesively-Bonded Joints in Metallic Alloys, Polymers and Composite Materials: Mechanical and Environmental Durability Performance", Journal of Materials Science, vol. 39(15), pp. 4729- 4797, 2004.
[3] N. Choupani, "Characterizations of Adhesively Bonded Double-Lap Joints" Proceedings: International Conference on Advances in Mechanical Engineering SRM Institute of Science and Technology Deemed University, Chennai, India: 14-16 December 2006.
[4] J. R. Rice, "Elastic Fracture Mechanics Concepts for Interfacial Cracks", J. Appl. Mech., vol. 55, pp. 98-103, 1988.
[5] F. Ducept, P. Davies, and D. Gamby, "Mixed Mode Failure Criteria for a Glass/Epoxy Composite and an Adhesively Bonded Composite/Composite Joint", International Journal of Adhesion & Adhesives, vol. 20, pp. 233-244, 2000.
[6] L. M. Butkus, "Environmental Durability of Adhesively Bonded Joints", The Georgia Institute of Technology, WPAFB OH, Report No. 97-028D, 14 Oct. 1997.
[7] E. N. Gilbert, B. S. Hayes, and J. C. Seferis, "Nano-Alumina Modified Epoxy Based Film Adhesives", Polymer Engineering and Science, vol. 43(5), pp. 1096-1104, 2003.
[8] A. Pirondi and G. Nicoletto, "Mixed Mode I/II Fracture Toughness of Bonded Joints", International Journal of Adhesion and Adhesives, vol. 22(2), pp. 109-117, 2002.
[9] Naveen Rastogi, Som R.Sonia & Arvind Nagar, ''Thermal Stresses in aluminum-to-composite double-lap bonded joints'', Advances in Engineering Software, vol29, no.3-6, pp273-281, 1998.
[10] N. Choupani, '' Interfacial Mixed-mode Fracture Characterization of Adhesively Bonded Aerospace Material System" Proceedings of the 6th Conference of Aerospace Society(Aero2007), K. N. Toosi University of Technology, Tehran, Iran, 24-25 Feb 2007.
[11] N. Choupani, "FE Analysis of Stress Intensity Factors in Adhesively Bonded Double-lap Specimens" Proceedings: International Conference on Advances in Mechanical Engineering-2006 (AME 2006), Baba Banda Singh Bahadur Engineering College, Fatehgarh Sahib, Punjab, India, December 1-3, 2006.