A Numerical Study of Intergranular and Oxidation-Driven Fracture in an Elastic-Viscoplastic Material
Carranza, Fernando L.
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https://hdl.handle.net/2142/87765
Description
Title
A Numerical Study of Intergranular and Oxidation-Driven Fracture in an Elastic-Viscoplastic Material
Author(s)
Carranza, Fernando L.
Issue Date
1997
Doctoral Committee Chair(s)
Haber, Robert B.
Department of Study
Theoretical and Applied Mechanics
Discipline
Theoretical and Applied Mechanics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Mechanical
Language
eng
Abstract
This study focuses on one mechanism that is believed to be important in the fatigue response of high-temperature superalloys: intergranular fracture driven by the infiltration and embrittlement of grain boundaries by oxygen. A novel space-time finite element model is developed to study this mechanism. The numerical model provides the basis for generic investigations of the kinetics of quasi-static crack growth along a brittle interface (such as an oxidized grain boundary) embedded in an elastic-viscoplastic material. Additional studies illuminate the complex interactions between stress-assisted grain-boundary diffusion, inelastic material response and grain-boundary cleavage.
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