Abstract
The present work encompasses the investigation of Low Cycle Fatigue (LCF) of aluminum alloy AA6061 in three conditions, annealing (O), T4 and T651. AA6061-O has the higher value of transition fatigue life (NT) because it has the highest ductility, while the fatigue strength exponent and fatigue ductility exponent are within the range of metallic materials. The SEM morphology for specimens at strain closer to true tensile stress show multi-crack origins with secondary cracks and large final fracture zone. The striations are very clear for O-condition.
Highlights
Aluminum and its alloys are being used successfully in a wide range of applications, from packaging to aerospace industries
The present work encompasses the investigation of Low Cycle Fatigue (LCF) of aluminum alloy AA6061 in three conditions, annealing (O), T4 and T651
AA6061-O has the higher value of transition fatigue life (NT) because it has the highest ductility, while the fatigue strength exponent and fatigue ductility exponent are within the range of metallic materials
Summary
Aluminum and its alloys are being used successfully in a wide range of applications, from packaging to aerospace industries. One of the essential goals in the fatigue process study is the prediction of the fatigue life of a structure or machine component subjected to a given stress-time history To allow this prediction, complete information about the response and behavior of the material subjected to cyclic loading is necessary (Haji, 2010; Kwon, Song, Shin, & Kwun, 2010). Borrego, Abreu, Costa and Ferreira (2004) studied low-cycle fatigue of two AlMgSi aluminum alloys AA6082-T6 and AA6060-T6 alloys They were concluded that AA6060-T6 exhibits nearly ideal Masing behavior, while alloy AA6082-T6 presents significant deviations from the Masing model. A low cycle fatigue model has been developed to predict the fatigue life of both the unreinforced aluminum alloy and the short fibre reinforced aluminum alloy metal-matrix composites based solely on crack propagation from microstructural features (Ding, Biermann, & Hartmann, 2002).
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