Experimental and FEM studies on mechanical properties of single-lap adhesive joint with dissimilar adherends subjected to impact tensile loadings

Abstract

a b s t r a c tThe rupture initiation position, the stress wave propagations and interface stress distributions of the single-lap adhesive joint with dissimilar adherends under impact tensile loadings are analyzed via experiments combined with FEM calculations taking account of the strain rate dependency property of the adhesive. It is obtained that rupture initiates at the interface of the adherend with higher Young's modulus (steel side in this study) in the joint under impact tensile loadings, which shows the opposite characteristic in the same type of joint under static loadings. A fairly good agreement is observed between the experimental measured and FEM calculated results. In addition, it is also found that the strength of the joint with dissimilar adherends is smaller than that of the joint with similar adherends when the joint is subjected to the impact tensile loadings owing to the different extent of the wave impedance mismatch which depends on the material properties. Finally, the design guideline for the single-lap adhesive joint is summarized and provided.

Joining of dissimilar materials

“…Numerical models can improve test designs and the evaluation of results. Examples found in literature include; (i) laser assisted tape consolidation of thermoplastics [31], (ii) friction stir welding of dissimilar materials [88,126], (iii) mechanical connections [47,95], and (iv) adhesive connections [134,196].…”

“…An other variation of using FEM are presented by Liao et al [134]. The calculations are based on the Cowper-Symonds constitutive model, which takes into account the strain rate dependency.…”

Shear directional impact characteristics of adhesively bonded tubular joints

“…Meanwhile, the adhesion area was considered as 50% of the adhesion area specified in ASTM D950-03 considering the maximum allowable load and safety based on the static test results. [8] Carbon steel AISI 1045 was used for the mechanical structure of adherend pins and rings. The surface of the pin and ring on which adhesive was applied was treated with a #80 sandpaper so that the mean roughness (Ra) of the surface would be 1.5 μm [11,12], since the failure of adhesives is affected by the surface roughness of a specimen.…”

“…Yang et al [6] modelled high-strength steel joints using toughened adhesives in vehicle crash simulation. Liao et al [7,8] performed three-dimensional FE analysis and experiment to investigate the behaviour of single-lap adhesive joints subjected to impact tensile loading. Wu et al [9] investigated the transverse directional crashworthiness of CFRP adhesively bonded joints experimentally.…”

Study on failure mechanism of Cu-polyethylene-Cu sandwich structure by molecular dynamics simulation

“…The experimental data can be integrated into a specific mathematical model to obtain the normal or shear separation strength [6,7]. Liao et al [8] carried out the experimental and finite element (FE) calculation for single-lap adhesive joints, which presented the different rupture initiation positions under impact and static tensile loadings. As one of the important parameters during the bonding process, the thickness of the adhesive layer, especially with a small value, has a great influence on the interfacial strength.…”