Modeling the growth of LT and TL-oriented fatigue cracks in longitudinally and transversely pre-strained Al 2524-T3 alloy
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Data
2011-09-23
Autores
Maduro, L. P.
Baptista, C. A R P
Torres, M. A S [UNESP]
Souza, R. C.
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Resumo
The aluminum alloy 2524 (Al-Cu-Mg) was developed during the 90s mainly to be employed in aircraft fuselage panels, replacing the standard Al 2024. In the present analysis the fatigue crack growth (FCG) behavior of 2524-T3 was investigated, regarding the influence of three parameters: load ratio, pre strain and crack plane orientation of the material. The pre strain of aluminum alloys is usually performed in order to obtain a more homogeneous precipitates distribution, accompanied by an increase in the yield strength. In this work, it was evaluated the resistance of Al 2524-T3 sheet samples to the fatigue crack growth, having L-T and T-L crack orientations. FCG tests were performed under constant amplitude loading at three distinct positive load ratios. The three material conditions were tested: as received(AR), pre strained longitudinally (SL) and transversally (ST) in relation to rolling direction. In order to describe FCG behavior, two-parameter kinetic equations were compared: a Paris-type potential model and a new exponential equation introduced in a previous work conducted by our research group. It was observed that the exponential model, which takes into account the deviations from linearity presented by da/dN versus AK data, describes more adequately the FCG behavior of Al 224-T3 in relation to load ratio, pre strain effects and crack plane orientation. © 2011 Published by Elsevier Ltd.
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Palavras-chave
Aluminum alloys, Fatigue crack growth, Modeling, Pre strain, Aircraft fuselages, Al 2024, Al-Cu-Mg, Constant amplitude loading, Crack orientations, Crack plane, Exponential equations, Exponential models, Fatigue cracks, Kinetic equations, Load ratio, Material conditions, Potential Model, Pre-strain, Research groups, Rolling direction, Sheet samples, Three parameters, Aircraft materials, Aluminum, Cerium alloys, Cracks, Fatigue crack propagation, Fatigue of materials, Fuselages, Growth (materials), Integral equations, Mechanical engineering, Models
Como citar
Procedia Engineering, v. 10, p. 1214-1219.