Abstract
The main concern of this work is the mechanical characterization of adhesively bonded assemblies under dynamic shear loading ranging from quasi-static (10 −4 s −1) up to high (10 4 s −1) strain rates. The double-lap shear sample is proposed and a bonding procedure is established. The assemblies are made of steel substrates bonded with an epoxy adhesive. Two surface treatments of the substrates are considered: ethanol and sand shooting. The shear strength and the failure strain are measured by taking into account the testing setups accuracy and the non-uniform distribution of the stress and strain fields in the overlap region. The sensitivity of the strength and the failure strain to the strain rate is highlighted; it is found that the failure strain decreases and the shear strength increases with the strain rate until reaching a maximum value then it drops for very high strain rates.
Highlights
IntroductionAdhesively bonded assemblies have gained an increasing interest in the industry
For several decades, adhesively bonded assemblies have gained an increasing interest in the industry
Double-lap joint samples were tested on a wide range of strain rates considering two surface preparation treatments and three overlap lengths
Summary
Adhesively bonded assemblies have gained an increasing interest in the industry. The most widespread loading case is static shear, but these assemblies may undergo dynamic loading such as shock or impact depending on their practical applications. Several publications have studied the experimental characterization of bonded assemblies under dynamic loading. Beevers and Ellis [3] used a special drop-weight tower to assess the impact response of a single-lap adhesive joint; the yield strength of the substrate was strain rate-dependent which influenced the results. This setup was used to compare bonded assemblies, pop-riveted assemblies and spot-welded assemblies under combined tension and shear loading. Bezemer et al [5] used a rod-and-ring specimen impacted by a drop-weight system and a compressive air gun to test the shear failure energy in bonded joints
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