Effect of Adhesive Layer Thickness on the Shear Strength of Adhesively Bonded Steel Joints in Wet Environment

Abstract:

The paper presents the static strength of adhesively bonded steel joints aged in deionized water at a temperature of 60°C for 15 days at various adhesive thicknesses from 0.1 mm to 0.5 mm. Water uptake and the bulk adhesive tensile properties after aged in the same environment as the joints were also presented. It has been shown that water diffusion into the adhesive is non Fickian. The absorbed water in the adhesive significantly decreases the mechanical properties and it affects the static strength of the bonded steel joints. The effect of water is shown to be significant when the adhesive thickness is thicker than 0.2 mm as the static strength decreases sharply. This information is useful when designing the adhesive joints using thick adhesive layer exposed in moist environment.

• Periodical: Applied Mechanics and Materials (Volume 836)
• Pages: 78-82
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.836.78
• Online since: June 2016
• Authors: Sugiman Sugiman*, Ilham Akbar, Emmy Dyah Sulistyowati, Paryanto Dwi Setyawan
• Keywords: Adhesive Thickness, Mechanical Properties, Steel Joints, Water Uptake

References

[1] C.D.M. Liljedahl, A.D. Crocombe, M.M.A. Wahab, I.A. Ashcroft, Modelling the environmental degradation of adhesively bonded aluminium and composite joints using a CZM approach, Int. J. Adhes. & Adhes. 27 (2007) 505–518.

DOI: 10.1016/j.ijadhadh.2006.09.015

[2] W.K. Loh, A.D. Crocombe, M.M.A. Wahab, I.A. Ashcroft, Modelling anomalous moisture uptake, swelling and thermal characteristics of a rubber toughened epoxy adhesive, Int. J. Adhes. & Adhes. 25 (2005) 1–12.

DOI: 10.1016/j.ijadhadh.2004.02.002

[3] L. Li, M. Liu, S. Li, Morphology effect on water sorption in a thermoplastic modified epoxy system, Polymer 45 (2004) 2837-2842.

DOI: 10.1016/j.polymer.2004.02.002

[4] M.R. Vanlandingham, E.F. Eduljee, J.W. Gillespie JR, Moisture diffusion in epoxy system, Journal of Applied Polymer Science 71 (1999) 787-798.

DOI: 10.1002/(sici)1097-4628(19990131)71:5<787::aid-app12>3.0.co;2-a

[5] Y. Li, J. Miranda, H.J. Sue, Hygrothermal diffusion behaviour in bismaleimide resin, Polymer 42 (2001) 7791-7799.

DOI: 10.1016/s0032-3861(01)00241-5

[6] M.Y.M. Chiang, M.F. Garcia, Relation of swelling and Tg depression to the apparent free volume of a particle-filled, epoxy-based adhesive, Journal of Applied Polymer Science 87 (2003) 1436-1444.

DOI: 10.1002/app.11576

[7] Y.C. Lin, X. Chen, Moisture sorption-desorption-resorption characteristic and its effect on the mechanical behaviour of the epoxy system, Polymer 45 (2005) 11994-12003.

DOI: 10.1016/j.polymer.2005.10.002

[8] J. Zhou, J.P. Lucas, Hygrothermal effects of epoxy resin. Part II: variations of glass transition temperature, Polymer 40 (1999) 5513-5522.

DOI: 10.1016/s0032-3861(98)00791-5

[9] G.Z. Xiao, M.E.R. Shanahan, Swelling of DGEBA/DDA epoxy resin during hygrothermal ageing, Polymer 39 (1998) 3253-3260.

DOI: 10.1016/s0032-3861(97)10060-x

[10] G.Z. Xiao, M.E.R. Shanahan, Water absorption and desorption in an epoxy resin with degradation, Journal of Polymer Science: Part B: Polymer Physics 35 (1997) 2659-2670.

DOI: 10.1002/(sici)1099-0488(19971130)35:16<2659::aid-polb9>3.0.co;2-k

[11] I.A. Aschroft, M.M.A. Wahab, A.D. Crocombe, D.J. Hughes, S.J. Shaw, The effect of environment on the fatigue of bonded composite joints. Part 1: testing and fractography, Composites: Part A 32 (2001) 45-58.

DOI: 10.1016/s1359-835x(00)00131-7

[12] S. Sugiman, A.D. Crocombe, I.A. Aschroft, Experimental and numerical investigation of the static response of environmentally aged adhesively bonded joints, Int. J. Adhes. & Adhes. 40 (2013) 224–237.

DOI: 10.1016/j.ijadhadh.2012.08.007

[13] R.D. Adams, J.W. Cowap, Farquharson, G.M. Margary, D. Vaughn, The relative merits of the Boeing wedge test and double cantilever beam test for assessing the durability of adhesively bonded joints, with particular reference to the use of fracture mechanics, Int. J. Adhes. & Adhes. 29 (2009).

DOI: 10.1016/j.ijadhadh.2009.02.010

[14] A.J. Kinloch, S.J. Shaw, The fracture resistance of a toughened epoxy adhesive, Journal of Adhesion 12 (1981) 59-77.

[15] S. Azari, M. Papini, J.K. Spelt, Effect of adhesive thickness on fatigue and fracture of toughened epoxy joints–Part I: Experiments, Eng. Fracture Mechanics 78 (2011) 153-162.

DOI: 10.1016/j.engfracmech.2010.06.025

[16] J. Crank, The Mathematic of diffusion, 2nd edition, Oxford University Press, London, (1975).

[17] S.R. Ranade, Y. Guan, D.C. Ohanehi, J.G. Dillard, R.C. Batra, D.A. Dillard, A tapered bondline thickness double cantilever beam (DCB) specimen geometry for combinatorial fracture studies of adhesive bonds, Int. J. Adhes. & Adhes. 55 (2014).

DOI: 10.1016/j.ijadhadh.2014.08.006