Issue 48

M. Bezzerrouki et alii, Frattura ed Integrità Strutturale, 48 (2019) 491-502; DOI: 10.3221/IGF-ESIS.48.47 494 Figure 4 : Model 3: ASTM D1002 modified (reduction of 0.1 mm for both of plates). F INITES ELEMENTS MODELS he models are simulated with a three dimensional finite element method analysis using Abaqus software [17]. A refined mesh is presented at the adhesive layer and plates to determine the maximum stresses which are located at the adhesive interface / adheres to the free edge. Indeed, the refinement of the mesh is of great importance for the analysis of the structure. The linear elements (C3D8R) are used for the mesh of all parts of the models studies. The number of elements over parts of Aluminum plate and the Adhesive layer are respectively 14240 and 1275 for the model 1, 16167 and 1275 for model 2 and 3. The Fig. 5 shows the detail of the meshed models. Each layer is considered as an individual three-dimensional structure under a state of plane-stress and can be connected with adhesive bonds. The Adhesive layer is homogeneous, elastoplastic, isotropic and deforms under shear and peel stresses. Figure 5 : Mesh of the single-lap-joint and the detail at the overlap joint. In the finite element model the nodes are common between the Aluminum plate and the adhesive layer so that there is a continuity of deformation and stress. This technique of the three layers modelling was used by Naboulsi and Mall [18]. The advantage of modelling the adhesive is to provide a continuous body to be able to capture the characteristics of the adhesive which are required for considering the progressive damage, heating effects, a nonlinear behavior of material, etc. R ESULTS AND ANALYSIS he overlap length is an important parameter in the strength of the assembly, for the ASTM D1002 there are a small overlap length compared to the length of plates and therefore a large load transfer through the adhesive layer. T T 2 mm Overlap area 2 mm L o Overlap area. 0.1 mm 0.1 mm