Abstract
The failure load of single-lap steel joints (subjected to tensile force) with epoxy/nano-Al2O3 adhesives was analysed experimentally. Spherical-shaped nano-Al2O3 of diameter 23–47 nm and rod-shaped nano-Al2O3 of diameter < 10 nm and length < 50 nm were included in the epoxy adhesive by wt% (0.5, 1.0, 1.5, and 2.0 wt%). Stress intensity factor of the adhesive layer at the corner of single-lap joints was calculated from the failure load. A substantial improvement in the failure load and stress intensity factor of epoxy/nano-Al2O3 adhesives was obtained compared to the base adhesive. The maximum failure load and stress intensity factor of epoxy/nano-Al2O3 adhesives were found at 1.0 wt% of Al2O3 nanorods and 1.5 wt% of Al2O3 nanospheres. The failure load and stress intensity factor of epoxy/nano-Al2O3 adhesives reduced on further addition of nano-Al2O3 (i.e. 1.5 and 2.0 wt% of nanorods and 2.0 wt% of nanospheres). Still, these were more than the base adhesive.
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