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A computational comparison of the inelastic constitutive models of hart and miller

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Summary

The uniaxial response behavior of Hart's and Miller's nonelastic constitutive equations is compared. These models have been selected because they are fully developed and have been applied on the uniaxial nonelastic response behavior of different materials. Among these for stainless steel AISI 316 the complete set of material parameters for both models has been published. Based on these parameter sets a comparison of both models is performed including monotonic strain controlled tensile tests, creep tests, load relaxation tests and cyclic tests. The predictions of both models are compared with available experimental data.

Both models can not describe the whole range of experimental data. For Hart's model one essential flow parameter had to be adjusted to obtain a reasonable simulation of creep experiments. Further it gives unrealistic predictions for strain cycling. The incorporation of a so-called negative strain rate sensitivity severly restricts the practical applicability of Miller's model. Additionally in the high temperature regime the response curves for load relaxation tests deviate considerably from the experimentally observed ones at low strain rates. Both models have to be improved for practical applications.

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  1. Fachgebiet Maschinenelemente und Getriebe, Technische Hochschule Darmstadt, D-6100, Darmstadt, Federal Republic of Germany

    G. Hartmann & F. G. Kollmann

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  1. G. Hartmann
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  2. F. G. Kollmann
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Hartmann, G., Kollmann, F.G. A computational comparison of the inelastic constitutive models of hart and miller. Acta Mechanica 69, 139–165 (1987). https://doi.org/10.1007/BF01175718

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