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Georgia Tech

1. Estrada Rodas, Ernesto Alejandro. Microstructure-sensitive creep-fatigue interaction crystal-viscoplasticity model for single-crystal nickel-base superalloys.

Degree: PhD, Mechanical Engineering, 2017, Georgia Tech

An enhanced generation temperature-dependent crystal viscoplasticity (CVP) model targeting the creep-fatigue interactions in Ni-base superalloys single-crystals is developed. The model is fitted to experimental data obtained on superalloy CMSX-8. At the microstructure level of interest, superalloys are comprised of an ordered and a disordered face-centered cubic phase. However, few models explicitly account for the deformation mechanisms active on each phase. In this work, a novel approach is used to model both material phases and to bridge several length scales. To this end, a physically-based approach is utilized to model the microstructure morphology, the distinct deformation mechanisms that become active on each material phase, and the evolution of dislocation densities. This increased fidelity leads to challenges in implementation which are addressed by developing a new quasi Newton-Raphson algorithm. The algorithm enables application in commercially-available displacement-based Finite Element codes. The CVP model can help designers predict component response using realistic geometries and boundary conditions. This model is also a first step toward an Integrated Computational Materials Engineering (ICME) tool that could be used to enhance current understanding of superalloys and alloy design. Advisors/Committee Members: Neu, Richard W. (advisor), Gerhardt, Rosario A. (committee member), Kalidindi, Surya R. (committee member), McDowell, David L. (committee member), Pierron, Oliver N. (committee member).

Subjects/Keywords: Superalloys; Creep-fatigue; Fatigue; Thermomechanial fatigue; Creep; Constitutive behavior; Crystal plasticity; Alloy design; Algorithms

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Estrada Rodas, E. A. (2017). Microstructure-sensitive creep-fatigue interaction crystal-viscoplasticity model for single-crystal nickel-base superalloys. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/59788

Chicago Manual of Style (16th Edition):

Estrada Rodas, Ernesto Alejandro. “Microstructure-sensitive creep-fatigue interaction crystal-viscoplasticity model for single-crystal nickel-base superalloys.” 2017. Doctoral Dissertation, Georgia Tech. Accessed March 19, 2019. http://hdl.handle.net/1853/59788.

MLA Handbook (7th Edition):

Estrada Rodas, Ernesto Alejandro. “Microstructure-sensitive creep-fatigue interaction crystal-viscoplasticity model for single-crystal nickel-base superalloys.” 2017. Web. 19 Mar 2019.

Vancouver:

Estrada Rodas EA. Microstructure-sensitive creep-fatigue interaction crystal-viscoplasticity model for single-crystal nickel-base superalloys. [Internet] [Doctoral dissertation]. Georgia Tech; 2017. [cited 2019 Mar 19]. Available from: http://hdl.handle.net/1853/59788.

Council of Science Editors:

Estrada Rodas EA. Microstructure-sensitive creep-fatigue interaction crystal-viscoplasticity model for single-crystal nickel-base superalloys. [Doctoral Dissertation]. Georgia Tech; 2017. Available from: http://hdl.handle.net/1853/59788

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