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With 1 or 2 rows of elements in the adhesive, the results are far more consistent and compute for higher displacements/strains. This can be useful if you are interested in load/displacement or stress/strain curves. In my case it is a good tool to validate the material properties but not for...

SWComposites, Indeed the difference in stiffness between the two materials seems too important for Abaqus to provide consistent results. I talked with my supervisor and we did not manage to solve the problem. I will only focus on elastic strain now. I will try your suggestion and tell you if...

In another model undergoing higher loads, this is what happens : We can clearly see that the plastic behavior is wrong, but it behaved consistently for tensile simulations.

SWComposites, Indeed you are right, the plastic strain seems to concentrate in the element at the bottom left corner and only spreads in the first layer. The following pictures show the equivalent plastic strain and the total strain respctively. Is it possible to avoid such a behavior...

SWComposites, Here is the deformed plot for linear elastic properties. For the linear elastic case, the weird mesh deformation does not appear, so I believe my model behaves incorrectly with plastic deformation. Nonetheless, I tried doing simple tensile tests for both materials in order to...

rb1957, Indeed for the presented model, the adhesive nodes and the substrate nodes do not align. However I also conducted simulations with aligned nodes and I witnessed the same issue. In the experimental study, the fixtures were added to each end of the substrates in order to avoid the...

rb1957, I plotted total displacement. What do you mean about mesh constraints ? If you talk about mesh controls and element type, the elements are default plane strain and the shape is quad (technique : free and advancing front algorithm). No ALE Adaptative Mesh was employed to obtain these...

FEA way, Thank you for your advice, I realised that adhesive section was defined as "Solid" instead of "Cohesive". Does this mistake have significant impact on the results ? I will try changing section and element type in the mesh.

SWComposites, Here is a picture of the undeformed mesh. It was refined where the stress is concentrated. I also tried a model with a regular square mesh, but the same behavior appears. The elastic properties of the substrate are : E = 2040 MPa v = 0.4 Density : 5170 kg/m^3 Plastic...

rb1957, The stress repartition is consistent as it is expected to concentrate in the bottom left and top right corners of the adhesive. Indeed vM stress is not optimal and I should focus on shear and peel stress. But my main issue is the strange mesh deformation. I am not sure of what you mean...

Hello, I am studying the stress repartition inside of the adhesive layer of a single lap joint (SLJ). The substrates and the adhesive are considered elasto-plastic with a hardening plastic behavior obtained by SLJ shear tests and tensile tests. The model 2D plane strain, the solver is Dynamic...