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In this study, fracture characteristics of epoxy adhesively bonded butt joint of dissimilar metals, namely SUS304 stainless steel and YH75 aluminium alloy were examined on various adhesive bond thicknesses in associations with artificial interface-crack subjected to pure mode I loading. Tensile fracture tests were employed. Finite element analysis was also executed to investigate the fracture mechanisms of adhesive joints by ANSYS 11 code. The results show that the strength of adhesive joints without crack decreased with increasing bond thickness. The interfacial corner toughness, Hc can be applied for predicting adhesive joints strength provided that the small-scale yielding conditions must apply. Evaluated fracture toughness, Jc of adhesive joints with interfacial crack was independent of bond thickness when failure was associated with crack deviated into adhesive layer. Nevertheless, Jc for adhesive joints with interfacial crack was dependent on bond thickness when the failure was apparently interfacial.

Effect of Bond Thickness on Fracture Behavior of Interfacial Crack in Adhesive Joint of Dissimilar Materials