The paper studies the effect of strain-loading sequence on fatigue lifetime and fracture surface topographies in 7075-T651 aluminum alloy specimens. Fatigue tests were performed two ways: (i) constant-amplitude loading (ii) series variable amplitude with non-zero mean strain values. topography fractures was measured over their entire surfaces help an optical confocal measurement system. results...

7075 T6 aluminum alloys are applied in aircraft construction. The success of their weldability is a technological challenge bringing advantages the lightening structures. This work was carried out aim to analyze mechanical behavior and microstructural evolution sheets welded by TIG process, applying pulsed current. A notable change occurred our materials thermal effect, resulting degradation pr...

This paper developed a fatigue crack growth model considering the effects of load interaction and low-velocity impact (LVI) damage. Fatigue (FCG) accumulative method was established to assess life aluminium-alloy thin-sheets with LVI damage under spectrum loading. To validate proposed model, tests 7075-T62 were conducted, followed by post-impact constant amplitude tension–tension block loading ...

Drilling process is one of the most important operations in aeronautic industry. It is performed on the wings of the aeroplanes and its main problem lies with the burr generation. At present moment, there is a visual inspection and manual burr elimination task subsequent to the drilling and previous to the riveting to ensure the quality of the product. These operations increase the cost and the...

Recently, new types of C-shaped members made from AA-6086 and 7075-T6 high-strength aluminium alloy have become more popular due to their high yield strength lower cost. These are often manufactured with pre-punched web perforations simplify the installation services, but this can reduce strength. Also, such that contain perforated webs vulnerable buckling failure, as has a elastic modulus comp...

The aim of this study was to predict the temperatures on all surfaces three-dimensional models using ANSYS 15.0 program. Firstly, from welding centre edges two aluminium alloys (AA-7075 & AA-2024) welded by friction stir process were perceived. Secondly, distribution start its end and derivation equations with time spent in process, along distance observed at different travel speeds cart (T...