Abstract
Lifing analysis and design of high temperature components, such as, turbine engines, needs accurate estimation of stresses and strains at failure locations. The structural integrity under these high temperature environments must be evaluated through finite element structural analysis. The structural analysis requires a robust constitutive model to predict local stresses and strains. The robustness of a new constitutive model can be validated by predicting stress and strain responses for a broad set of loading histories representative of local structural responses. The experimental database encompasses low cycle creep-fatigue experiments for a nickel-base superalloy, Haynes 230, under symmetric, uniaxial strain-controlled loading histories which include isothermal with and without hold times, with and without a mean strain, at temperatures ranging from 75 °F to 1,800 °F. A unified viscoplastic model based on nonlinear kinematic hardening (Chaboche type) with several added features, such as strain range dependence and static recovery will be critically evaluated against the experimental responses. This study will especially evaluate various flow rules, like, Norton, sine hyperbolic, and creep-plasticity interaction models on the viscoplastic simulation. Simulations from the modified model are compared to the experimental responses to demonstrate the strengths and weaknesses.
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Acknowledgements
The financial support of Honeywell Aerospace is gratefully acknowledged. All experiments were conducted by Element in Cincinnati, Ohio.
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Barrett, P.R., Menon, M., Hassan, T. (2014). Unified Constitutive Modeling of Haynes 230 for Isothermal Creep-Fatigue Responses. In: Antoun, B., et al. Challenges In Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials, Volume 2. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-00852-3_20
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DOI: https://doi.org/10.1007/978-3-319-00852-3_20
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