A unified constitutive model for superalloys |
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Authors: | D. Slavik T.S. Cook |
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Affiliation: | General Electric Aircraft Engines 1 Neumann Way, Cincinnati, OH 45215-6301 Mail Stop A333, USA |
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Abstract: | A physically based unified constitutive model is presented for an aircraft engine nickelbase superalloy. The model accounts for deformation modes that can be activated under different stress, time, and temperature combinations. Two internal state variables and a flow function have been utilized to prdict strain rate sensitivity, stress hold creep, strain hold relaxation, monotonic loading, cyclic loading, and thermal mechanical cycling. In the model flow function, creep deformation and plasticity deformation modes have been incorporated over a wide range of temperatures (0.4 < T/Tmelt < 0.75). The model is checked with independent isothermal and thermal mechanical experiments. Different temperature ranges are explored to assess model capabilities. |
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