Issue 48

M. Bezzerrouki et alii, Frattura ed Integrità Strutturale, 48 (2019) 491-502; DOI: 10.3221/IGF-ESIS.48.47 499 Comparison of stresses at edge and depth of assembly along overlap length for the 3 models In order to clearly present the effect of the modifications made to the plates under the variation of the stresses, Figs. 10 and 11 present the comparisons of the stresses at the edge and the depth of the adhesive. It is clear that increasing the applied stress considerably increases the various stresses at the edges. The percentage increase varies depending on the applied stress and the model used. One remark that; the first model has the highest rate for the different stresses in the adhesive layer and the lowest values are noted for the model 3. (a) (b) (c) Figure 10: Comparison of the stresses (a) -Von-Mises, (b) -Shearing and (c) – Peeling at edge for the 3 models of assembly according to the stresses applied. Analyzing now the Fig. 11 which gives the comparisons of the stresses inside the adhesive layer for the 3 models. It is noted that the stresses on the depths of the adhesive layers have low augmentation with the increase of applied stresses. For models 2 and 3 the stress curves coincide for the three types of stresses. Comparison of inactive lengths In single-layer assemblies, adhesive is the weakest link in the structure where its mechanical properties are lower than those of the two plates and therefore the risk of cracking or separation of the plates is high. Most research in this area is aimed at reducing edge stresses and working the central part of the adhesive, which in most cases remains inactive.