S-N-P curves in 7075 T7351 and 2024 T3 aluminium alloys subjected to surface treatments |
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| Authors: | A MONSALVE M PÁEZ M TOLEDANO A ARTIGAS Y SEPÚLVEDA y N VALENCIA |
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| Affiliation: | Departamento de Ingeniería Metalúrgica, Facultad de Ingeniería, Casilla 10233, Santiago, Chile,;, Departamento de Química de los Materiales, Facultad de Química y Biología, USACH, Casilla 40, Correo 33, Santiago, Chile;, Academia Politécnica Aeronáutica, Departamento de Investigación, P36 1/2 Gran Avenida, Santiago;, Escuela de Ingeniería de Caminos, Canales y Puertos, Universidad de la Coruña, Campus Elviña, La Coruña. |
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| Abstract: | The S-N-P (stress, number of cycles, failure probability) curves for 2024 T3 and 7075 T7351 aluminium alloys were obtained. Previously, surface treatments of degreasing and different types of anodizing were applied to samples, evaluating the influence of these treatments on the fatigue life of the alloys. The determination of the S-N-P curves was done using Maennig's method. Rotary fatigue was used because this technique produces greater stress on the sample surfaces, the zone in which it is important to evaluate fatigue resistance. Both the transition range and the finite life range were evaluated, calculating the 1, 50 and 99% fracture probability. SEM was performed in order to characterize the fracture micromechanism. The conclusions were that Maennig's method is useful to evaluate fatigue life of these materials in a fast and efficient manner. Moreover, surface treatments produce a decrease in the fatigue life of both alloys, associating this effect with the surface damage produced on each sample during the treatment. |
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| Keywords: | aluminium alloys anodizing fatigue surface treatment |
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