A novel ductile-brittle damage law for the numerical simulation of low cycle fatigue of a Al2024-T351 Aluminium alloy in its related S-direction is proposed. To illustrate the predictive capabilities of the brittle damage model, a benchmark example is presented. Some material parameters have been calibrated to Al2024 considering fatigue crack growth.

One of the important considerations in the design of components is the estimation of cyclic lifetime and analysis of the critical regions of a construction. The local approach of lifetime estimation using continuum damage mechanics (CDM) has shown a great potential in predicting material failure not only for monotonic, but also for fully reversed loadings. In this paper, the CDM model of Desmorat-Lemaitre [1] was investigated regarding the prediction of cyclic lifetime. A series of experiments on tension specimens with different geometries were performed. The latter were used for the determination of model parameters as well as for the validation of the predictive capability of the model.

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