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Abstract
ABSTRACT The fatigue behavior of aluminum alloy 5083 has been investigated by conducting low cycle reversal bending fatigue tests in air as well as in 3.5% NaCl solution between (3-15mm) displacement amplitude. Dog bone fatigue test specimens in as-hot and in as-cold deformed conditions were prepared. The characterization of the material in both deformation conditions was carried out through mechanical testing and microstructure analysis. A fatigue test rig was designed and erected so as to apply controlled displacement amplitudes. The rig is attached to a computerized universal testing machine by which the load changes and displacements within each cycle, until fracture, were recorded for each test. For each cycle in every test, at least 80 points (displacement amplitude (mm), load (N)) were recorded. Curves such as stress vs. number of cycles (S-N), hysteresis loops, and maximum load vs. number of cycles for each fatigue test, were plotted. Effect of applied displacement amplitude on fatigue life was studied.
Fracture surfaces of test specimens were investigated by the scanning electron microscope (SEM). The energy dispersive X-ray analysis (EDX) technique was used to identify the composition of present phases. For microscopic examination, optical microscope was used.
To calculate the bending stress and strain, revealed through each cycle, a finite element solution computer modeling program (ABAQUS) is used. The modeling program depends- in its calculation- on the mechanical.