A damage coupled unified constitutive model (UCM-CDM) is developed in this study to predict uniaxial fatigue, fatigue-creep, ratcheting and creep responses of Alloy 617. The experimental data used for validating the UCM-CDM included these responses for different strain rates and strain ranges for temperatures 760–1000°C. Rate dependent modeling features like Norton’s power law, static recovery, and isotropic damage evolution law are incorporated in an existing UCM for improving simulations of short-term stress relaxation and long-term creep responses. A backstress threshold modeling feature is incorporated in the UCM-CDM for improving ratcheting prediction for a wide range of mean and amplitude stresses. Simulations of the creep responses, including the primary, secondary and tertiary creep responses, in addition to the fatigue, fatigue-creep and ratcheting responses using the UCM with one set of model parameter are examined.
Uniaxial Fatigue, Creep and Ratcheting Response Simulations of Alloy 617 Using Damage Coupled Viscoplastic Model
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Islam, N, & Hassan, T. "Uniaxial Fatigue, Creep and Ratcheting Response Simulations of Alloy 617 Using Damage Coupled Viscoplastic Model." Proceedings of the ASME 2018 Pressure Vessels and Piping Conference. Volume 6A: Materials and Fabrication. Prague, Czech Republic. July 15–20, 2018. V06AT06A057. ASME. https://doi.org/10.1115/PVP2018-84756
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