![]() After that the samples were prepared by keeping in the vacuum chamber. ![]() The composite patches with the adhesive were filled fully to The same frequency and the orientation angle of the biasįabric carbon fiber used as the composite patch for all samples. ![]() Two types of repairs were applied to notched Aluminum plates as one-side andĭouble-side of composite patch. ![]() With these parameters, five different notch geometries were prepared for this In this study, notched Aluminum plates were repaired by composite patch.įundamental parameters for notched 5754 Aluminum plates are the notch length and the Although thinner patches (2 layers) do not present the required resistance, thicker patches (16 layers) may precipitate delamination onset and thus should be avoided. In general, boron and longer (140 mm) repair patches presented better performance than glass and shorter (70 mm) patches. Numerical simulations were partially compared with literature results to verify the modeling procedure, while a parametric study on the patch thickness was performed to verify the repair effectiveness. Glass/epoxy and boron/epoxy composite patches, with different number of patch layers, are considered in the analysis of the composite material repair effect on the crack tips stress distribution, evaluating the possibilities of crack propagation and patch delamination onset. Therefore, it is necessary to use a repair process to prevent the structure from final rupture. After several loading-unloading cycles of the dynamic load, mechanical stresses at the crack tips may result in unstable crack propagation. This paper reports a 3D finite element simulation of the mechanical responses of an aluminum tube containing a longitudinal crack repaired with composite patches. One of the main issues with the cylindrical tubes is the propagation of cracks during their operational life wherein most of the cracks happen along the axial direction of the tube.
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