Abstract
In the process of continuous improvement of manufacturing processes, this study was developed within the framework of the Ecovoss project, based on the inclusion of lightweight and new materials parts in the automotive sector. The objective was based on the replacement of aluminum welding operations with the option of adhesive operations with other types of materials such as polyamides or, in this case, a TEPEX® composite material (Dynalite 202-c200/50% TYP 13). The aim of this work is to test the best texturing of substrate made in 7075 aluminum specimens manufactured by robotic polishing with an ABB 6640 robot. Another substrate is TEPEX composite. A structural adhesive film AF-163-2 from the 3M company (St Paul, MN, USA) is used, which must be applied according to the manufacturing procedure. The tests carried out are based on the topographic measurement of the surfaces to be joined with an Alicona focus variation microscope, and the uniaxial shear tests of adhesive samples have been analyzed. The texture of the surface failure has been analyzed, and the results confirm a significant correlation between the texture parameters of initial surfaces and maximum shear stress. The expected results should provide a better understanding of the surfaces aimed to optimize the adhesion of the studied materials.
Highlights
One of the basic objectives in aeronautics and in the automotive sector is to try to lower the overall weight in order to reduce CO2 emissions
The objective of the present research is to evaluate the influence of the topography by robotic polishing of aluminum 7075 in order to join with reinforced polymer TEPEX® by means of 3M—AF163-2 structural adhesive
TEPEX measurements are simpler (2D) just to find whether the nature is random. 2D measurements were applied as the surface is not treated, and 3D topography inspection was performed after the tensile test
Summary
One of the basic objectives in aeronautics and in the automotive sector is to try to lower the overall weight in order to reduce CO2 emissions. Adhesive joining can be a very effective method to replace or complement traditional assembly and joining methods according to the specific need of the application. Advantages of adhesive bonding are overall structural lightening and reduced stress concentrations [1]. One of the disadvantages at an industrial level, when changing traditional assembly methods by adhesive, is based on the lack of knowledge regarding the behavior of adhesive joints over time. Uehara and Sakurai studied the influence of surface roughness on the joint strength of adhesion. They concluded that, for specific materials, there is an optimal surface roughness in the tensile strength of adhesion [2]
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