Describing the total fatigue crack growth curves for aluminum alloys with an exponential equation

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Abstract

A new model is proposed in order to describe the three regimes (near-threshold, intermediate and high propagation rate) of fatigue crack growth for a range of load ratios with a generalized exponential equation. The FCG curves used in this work include experimental data comprising aluminium alloy AMS 7475 T7351 obtained by means of constant-load-amplitude tests with four load ratios and one K-decreasing test for R=0.1, as well as crack growth data taken from literature for three aluminum alloys: 6013-T651, 2324 T39 and 7055 T7511. The performance of the proposed exponential equation is compared to the modified Forman model with respect to the goodness-of-fit and the ability to correlate the crack propagation rate for different Rratios with a reduced number of parameters. © 2010 Published by Elsevier Ltd.

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Siqueira, A. F., Baptista, C. A. R. P., Guimarães, O. L. C., & Ruckert, C. O. F. T. (2010). Describing the total fatigue crack growth curves for aluminum alloys with an exponential equation. In Procedia Engineering (Vol. 2, pp. 1905–1914). https://doi.org/10.1016/j.proeng.2010.03.205

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