Failure load predictions of adhesively bonded lap joints are either done based on a stress/strain limit criterion or using concepts of fracture mechanics. For the former case, the stress-strain curves of the adhesive must be determined accurately and for the latter case the toughness of the adhesive is needed. The present study gives for two adhesives, one brittle and one ductile, the strength and fracture properties in the bulk form. Stress-strain curves are given in tension and shear. The toughness was measured in mode I using a three point bending specimen and in mode III with a circular specimen with a notch under torsion. Mixed-mode criteria are discussed and it is shown that the experimental results are in good agreement with the strain energy theory. Finally, the effect of shrinkage stresses on the fracture toughness was studied and it is shown that they have a substantial effect on the fracture toughness.
Epoxy Tensile and shear properties Fracture toughness Mode I Mode III Effect of cure
This is a preview of subscription content, log in to check access.
Chen Z, Adams RD, da Silva LFM (2010) Mechanics of materials. submittedGoogle Scholar
da Silva LFM, Adams RD (2005) Measurement of the mechanical properties of structural adhesives in tension and shear over a wide range of temperatures. J Adh Sci Technol 19: 109–142CrossRefGoogle Scholar
da Silva LFM, Critchlow GW, Figueiredo MAV (2008) Parametric study of adhesively bonded single lap joints by the Taguchi method. J Adh Sci Technol 22: 1477–1494CrossRefGoogle Scholar
de Moura MFSF (2008) Progressive damage modelling. In: da Silva LFM, Öchsner A (eds) Modeling of adhesively bonded joints. Springer, Heidelberg, pp 155–182CrossRefGoogle Scholar
Dillard DA, Singh HK, Pohlit DJ, Starbuck MJ (2009) Observations on decreased fracture toughness for mixed mode fracture testing of adhesively bonded joints. J Adh Sci Technol 23: 1515–1530CrossRefGoogle Scholar
Duan K, Hu X, Mai Y-W (2004) Substrate constraint and adhesive thickness effects on fracture toughness of adhesive joints. J Adh Sci Technol 18: 39–53CrossRefGoogle Scholar
Erdogan F, Sih GC (1963) On the crack extension in plates under plane loading and transverse shear. J Basic Eng Trans ASME 85: 519–527Google Scholar