| Citation: | HONG Haiming, ZHAN Zhixin, WANG Jiayinget al. Damage mechanics-based fatigue life prediction for additive manufacturing metal materials[J]. Journal of Beijing University of Aeronautics and Astronautics, 2022, 48(6): 950-956. doi: 10.13700/j.bh.1001-5965.2020.0722(in Chinese)
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The additive manufacturing (AM) technology develops rapidly and it is widely employed in the fabrication of aerospace alloy components.Many additive manufacturing alloy components bear cyclic loadings, and the fatigue failure is very common. The fatigue damage model considering the influence of additive manufacturing process is established and the fatigue lives of additive manufacturing alloy materials are predicted. The elastic-plastic constitutive model and the fatigue damage model considering the additive manufacturing process parameters are presented, and the finite element numerical method is presented for the fatigue life computation. The fatigue lives of additive manufacturing metal materials are predicted, which are basically consistent with the experimental results, and the computed errors are analyzed from two aspects including the scatter of fatigue data and the porosity in the additive manufacturing materials. The influence of the volume energy density ratio on the fatigue properties of additive manufacturing metal materials is discussed, and the results are analyzed. This research provides an effective method for the fatigue damage evaluation of additive manufacturing metal materials.
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