Abstract
The purpose of the present research project is to study multiaxial fatigue behavior of 2618 alloy. The influence of mean stress on the fatigue behavior under tension and torsion is particularly investigated. Fatigue tests under combined tensile-torsion, in or out of phase, as well as combined tensile-torsion-internal pressure tests have also been conducted. Multiaxial fatigue results are analyzed according to Fatemi-Socie criterion to predict the fatigue life.
Highlights
Aluminum alloys take the first rank in nonferrous materials and are the engineering materials of choice for several industrial applications; they are for instance widely used in aeronautic construction because of their good mechanical properties and low density
Very few studies dealing with the effect of mean shear stress on the fatigue lifetime of aluminum alloys have been done, but this effect is very important because it makes the fatigue life decreased [1,2,3] and several components are subjected to unsymmetrical loading while in service
Tensile tests conducted with a positive stress ratio (0,1) and a negative stress ratio (-2) have shown that a positive mean stress makes the fatigue life decrease significantly [13]
Summary
Aluminum alloys take the first rank in nonferrous materials and are the engineering materials of choice for several industrial applications; they are for instance widely used in aeronautic construction because of their good mechanical properties and low density. Very few studies dealing with the effect of mean shear stress on the fatigue lifetime of aluminum alloys have been done, but this effect is very important because it makes the fatigue life decreased [1,2,3] and several components are subjected to unsymmetrical loading while in service. The effect of the mean shear stress is not clear in the high cycle fatigue, but become obvious in the low cycle fatigue [6] It has been demonstrated for an aluminum alloy from 2xxx series that fatigue life gradually reduces with increasing mean shear stress when this latter is lower than a threshold value [1,7]. Fracture surface observations and in particular crack initiation sites were performed in order to broaden this analysis
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