Experimental investigation of the shear dynamic behavior of double-lap adhesively bonded joints on a wide range of strain rates

Abstract

International audienceThe 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

Compression and shear behavior of epoxy SA 80 bulk adhesive over wide ranges of strain rate

“…Al-Maliky et al [44] observed a pronounced drop at high strain rate while testing PEEK and polyamide-66 (PA66). Recently, Challita et al [19] reported a drop of the shear strength of adhesively bonded double-lap joints. The same adhesive, i.e.…”

“…Zhang et al [9] used the servo-hydraulic machine to study the effect of a hygrothermal exposure on the dynamic strength of adhesive joints. However, most works [10][11][12][13][14][15][16][17][18][19][20][21][22] used the split Hopkinson pressure bar technique (SHPB) to measure the dynamic strength of several types of adhesive joints: single-lap, double-lap, rod-andcollar, split-cylinder, etc. In addition to the experimental characterization, adhesively bonded joints were also investigated using numerical [23,24] and analytical [25][26][27] approaches.…”

Adhesively bonded joints as a dissipative energy mechanism under impact loading

“…There are works about the dynamic behaviour of adhesively bonded joints which give stressstrain relationships for different strain rates [7], but there are not data (at least to the knowledge of theauthors) for damage models in dynamic conditions. So the material properties are taken from [8], where their numerical results were compared with the experimental results of [9], although both works are for quasi-static loading conditions.…”

Experimental study of strain rate effects on the strength of adhesively bonded joints after hygrothermal exposure

“…A few research works focused on the adhesive fracture properties under dynamic loading of low to intermediate strain rate. Challita et al [6] characterized the shear behavior of assemblies at adhesive shear strain rate from 10 À 4 s À 1 to 10 4 s À 1 . The findings indicated that the fracture strain decreases and the shear strength increases with the strain rate until reaching a maximum value, and then drops back at the extremely high strain rate.…”