Strain rate dependency on failure load and stress intensity factor of single lap steel joints bonded with epoxy adhesive reinforced with nano‐Al₂O₃ sphere and rod particles

Abstract

The failure load of single‐lap steel joints (subjected to compressive force) with epoxy/nano‐Al2O3 adhesives containing 0.5, 1.0, 1.5, and 2.0 wt% of sphere and rod nano‐Al2O3 was analyzed at quasi‐static loading. At optimum wt% (1.5 wt%) of nano‐Al2O3, the failure load of epoxy/nano‐Al2O3 adhesive was determined at high strain rates using Kolsky bar. Critical stress intensity factor of the adhesive layer at the corner of single‐lap joints was calculated from the experimentally obtained failure load. A substantial improvement in the failure load and critical stress intensity factor of epoxy/nano‐Al2O3 adhesives was achieved compared to the base adhesive at quasi‐static and high shear strain rates. Whereas, the failure load of epoxy/nano‐Al2O3 adhesives containing 1.5 wt% of sphere and rod nano‐Al2O3 at high shear strain rates were 3 to 5 times more than the static failure load of adhesives. The reinforcement of sphere nano‐Al2O3 in epoxy had better performance on failure load and critical stress intensity factor of joints compared to rod nano‐Al2O3 under the compressive mode of loading.

A new platform for designing high‐performance epoxy film adhesive with poly (butyl acrylate‐block‐styrene) block copolymer and alumina nano particles in aluminum–aluminum bonded joints: Preparation and analysis of the mechanical, adhesion, and thermal properties

“…[1][2][3] Towing to their high chemical and thermal stability, corrosion strength, low curing shrinkage, great stability, and excellent adhesion, epoxy resins have found extensive applications in various industries. [4][5][6][7] These adhesives are produced in various forms and can be selected based on their application. 8 One of the special application of adhesives involves their use in the sandwich structures to attach the metallic honeycomb core to the upper and lower layers (which are usually made of aluminum).…”

“…The advantages of adhesive joints over the other types have resulted in their wide application in recent years 1–3 . Towing to their high chemical and thermal stability, corrosion strength, low curing shrinkage, great stability, and excellent adhesion, epoxy resins have found extensive applications in various industries 4–7 . These adhesives are produced in various forms and can be selected based on their application 8 .…”