A dislocation-based constitutive model for hydrogen—deformation interactions and a study of hydrogen-induced intergranular fracture
Novak, Paul M.
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https://hdl.handle.net/2142/14563
Description
Title
A dislocation-based constitutive model for hydrogen—deformation interactions and a study of hydrogen-induced intergranular fracture
Author(s)
Novak, Paul M.
Issue Date
2010-01-06T16:12:26Z
Director of Research (if dissertation) or Advisor (if thesis)
Sofronis, Petros
Doctoral Committee Chair(s)
Phillips, James W.
Committee Member(s)
Sofronis, Petros
Sottos, Nancy R.
Hsia, K. Jimmy
Department of Study
Mechanical Sci & Engineering
Discipline
Theoretical & Applied Mechans
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
hydrogen
fracture
weakest-link statistics
Abstract
This thesis presents two models of the effect of hydrogen on materials.
Both models are intended to link experimental observations of material
microstructure with macroscopically observable results. The first model
creates a continuum, rate dependent plasticity model that incorporates
the effect of hydrogen on dislocation generation, motion, and
annihilation; the transient motion of hydrogen through the material is
considered in a complete thermodynamic framework which determines the
chemical potential of the diffusing hydrogen. The behavior of several
austenitic stainless steels is considered, both in comparison with
uniaxial tension experiments and in comparison with a rate independent
model of plastic deformation ahead of a crack tip. The second model is
a framework for describing the effect of hydrogen on a weakest-link
statistical fracture model by combining the two hydrogen embrittlement
mechanisms usually thought of as mutually exclusive, hydrogen
enhanced localized plasticity, and hydrogen induced decohesion. The
model is developed, implemented in a finite element analysis program,
and verified against experiment and previous statistical fracture
models. The model is used to predict the failure load of a high
strength, low alloy steel, and sets a basis for the prognosis of
structural steel components in a hydrogen environment.
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