This paper experimentally investigates the fatigue damage evolution in pre-corroded aluminum alloy (AA) 7075-T7651 via digital image correlation (DIC) and scanning electron microscopy (SEM). Three stages of including accumulation, macro-crack initiation propagation are identified described combined analysis severity curves strain maps. The micro-cracking characteristics dominant fracture region...

Abstract Cold Spray (CS) exhibit unique features due to the low temperatures involved. However, CS coating are harder than corresponding powders and bulk alloys, which results in a toughness then greatly limits application of CS. To overcome this shortage, preheat treatment powder post-heat applied improve performance cold-sprayed 7075 aluminum alloy coatings work. With increasing treatment, te...

Grain refinement improves the mechanical properties and formability of metals and alloys. So far, several different grain refinement methods have been proposed and studied. Severe plastic deformation is one of the most promising and efficient methods. Therefore, in the present study the possibility of imposing a two-step severe plastic deformation (Extrusion and Equal channel angular pressing) ...

the synthesis of polyaniline- fe2o3 nanocomposite coating on aluminum alloy 5052 (aa5052) surface has been investigated by using the galvanostatic method. the anticorrosion performance of polyaniline-fe2o3 coating was investigated in 3.5% nacl solution by the open- circuit potential (ocp), tafel polarization technique and electrochemical impedance spectroscopy (eis). the corrosion rate of polya...

the direct synthesis of polyaniline-tio2 nanocomposite coatings on aluminum alloy 3004 (aa3004) surface has been investigated by using the galvanostatic method. the synthesized coatings were characterized by ft-ir, sem-edx, sem and afm. optical absorption spectroscopy reveals the formation of the emeraldine oxidation state form of polyaniline-tio2 nanocomposite. the corrosion performances of po...

For pre-corroded aluminum alloy 7075-T6, the interacting effects of two neighboring pits on the stress concentration are comprehensively analyzed by considering various relative position parameters (inclination angle θ and dimensionless spacing parameter λ) and pit depth (d) with the finite element method. According to the severity of the stress concentration, the critical corrosion regions, be...

The vacuum brazing of dissimilar Al 7075 and Al–25 Si alloy was investigated. filler copper foil with a thickness 20 μm, the temperature 560 °C held for 10 min. average shear strength brazed joint 26.4 MPa. layer found to be dissolved completely, interface had an irregular shape serrated border, indicating good metallurgical bonding between two alloys. However, factors which might cause deterio...

In this study, in order to investigate crack retardation behavior and the variability of retardation cycles, crack growth tests are conducted on 7075-T6 aluminum alloy under a single tensile overload. A retardation coefficient D is introduced herein as the ratio of the crack growth rate under constant amplitude loading and the crack growth rate after an overload. This coefficient D is separatel...

The landing gear, which is one of the most important mechanical systems in aircraft, structure that exposed to loads, and critical loads aircraft throughout its life cycle. In addition fact gear system must have high strength these long life, performance, low volume, minimum weight, cost are criteria. For this purpose, optimum design created by making a structural analysis using finite element ...

Repair of aeronautical structures by composite patch bonding has shown its effectiveness in several studies during the last few decades. This repair technique leads to a retardation propagation repaired cracks via load bridging across throughout adhesive layer, interfacing it with structure. The purpose this study is analyze behavior patch-repaired present thin plates made aluminum alloy 7075-T...