Describing fatigue crack growth and load ratio effects in Al 2524 T3 alloy with an enhanced exponential model

Made available in DSpace on 2019-09-12T16:53:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2012The fatigue crack behavior in metals and alloys under constant amplitude test conditions is usually described by relationships between the crack growth rate da/dN and the stress intensity factor range Delta K. In the present work, an enhanced two-parameter exponential equation of fatigue crack growth was introduced in order to describe sub-critical crack propagation behavior of Al 2524-T3 alloy, commonly used in aircraft engineering applications. It was demonstrated that besides adequately correlating the load ratio effects, the exponential model also accounts for the slight deviations from linearity shown by the experimental curves. A comparison with Elber, Kujawski and "Unified Approach" models allowed for verifying the better performance, when confronted to the other tested models, presented by the exponential model. (C) 2012 Elsevier Ltd. All rights reserved.[Baptista, C. A. R. P.] Univ Sao Paulo, EEL, Dept Mat Engn, BR-12602810 Lorena, SP, Brazil[Adib, A. M. L.] Empresa Brasileira Aeronaut SA, EMBRAER, BR-12227901 Sao Jose Dos Campos, SP, Brazil[Torres, M. A. S.] UNESP, FEG, BR-12516410 Guaratingueta, SP, Brazil[Pastoukhov, V. A.] Universidade de Taubaté (Unitau), , Inst Engn, BR-12080000 Taubate, SP, Brazi