Effect of material, geometry, surface treatment and environment on the shear strength of single lap joints

Numerical analysis on load-bearing capacity and damage of double scarf adhesive joints subjected to combined loadings of tension and bending

“…For the effect of the adhesive thickness, Castagnetti et al discussed and then concluded that the intrinsic static strength of the adhesive increases significantly as the adhesive thickness decreases when cohesive failure occurs [31]. In the present study, the cohesive strength in each mode is considered to be equal to the yield strength of the adhesive (s u,I ¼s u,II ¼s ya ) for simplicity [8,16,[32][33][34].…”

“…For the joint with the ductile adhesive Hysol EA 9361, the resultant loading drops slowly until zero experiencing a quite large displacement, which illustrates a significant ductile property. It is assumed that the different downward trends are decided by the critical energy release rate of the adopted adhesive [8][9][10][11][32][33][34]. Neglecting the influences of the plastic dissipation energy, the ascending Sort of the critical energy release rate for the three adhesives is the brittle, the intermediate and the ductile adhesives (as shown in Table 2).…”

“…The load-bearing capacity of the adhesive joints has been extensively estimated employing the ultimate loading (F u ) [8][9][10][11][32][33][34]35]. It is assumed that the loading F of DSJ is combined with the tensile loadings in the x-and y-directions F ¼ Fig.…”

A finite element modelling methodology for the non-linear stiffness evaluation of adhesively bonded single lap-joints: Part 1. Evaluation of key parameters

“…Azari, Papimi and Spelt [27] reported in 2009 that certain researchers had found that increasing t a caused an increase in joint strength [28,29], some observed a strength decrease [5,30,31] and some no significant change at all [31,32]. A second 2009 investigation by Grant et al [26] with joints subjected to four-point bending concluded that the strength was "independent of the adhesive thickness", an "increase in adhesive thickness causes the joint overlap section to be stiffer" and that, for tension loading the strength increases with increased t a .…”

“…The work presented in this paper (Part 1) uses the single lap-joint configuration subjected to tension loading (see P in Figure 1(b)) to quantify, by physical measurement, the influence of seven key parameters for joint design (these are identified in Table 1 and Figure 2) on the non-linear joint stiffness; a similar exercise considering the effect of material and geometry parameters on the strength of overlap joint has been completed by da Silva et al [5]. In this paper 'joint stiffness' is given by the tensile load applied to the joint divided by the displacement (appropriate to the gauge length in the laboratory series of tests) it produces in the direction of tensile loading.…”