University of Illinois Urbana-Champaign

Numerical analysis of interaction of solute hydrogen atoms with stress field of crack

Lufrano, Jon M.; Sofronis, Petros

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https://hdl.handle.net/2142/112465

Description

Title
Numerical analysis of interaction of solute hydrogen atoms with stress field of crack
Author(s)
  • Lufrano, Jon M.
  • Sofronis, Petros
Issue Date
1994-10
Keyword(s)
  • Solute Hydrogen Atoms
  • Stress Field
  • Numerical Analysis
Abstract
Finite element analysis is used to study the effect of mobile interstitial hydrogen on the deformation of metals and alloys in the case when hydrogen is in equilibrium with local stresses. The effect is studied by calculating the hydrogen atmosphere around a stationary crack tip in a linearly elastic isotropic material loaded in a mode I plane strain conditions. Stresses, strains and equilibrium hydrogen concentrations are determined through an iterative finite element analysis while accounting for stress relaxation due to hydrogen induced local volume and elastic modulus changes. Numerical calculations reveal a zone immediately ahead of the crack tip in which the lattice is saturated with hydrogen. The dimensionless size of the saturation zone is found to be independent of the applied loads. The stiffness derivative method is used to calculate the hydrogen induced changes in the stress intensity factor. Calculations show that the presence of mobile interstitial hydrogen produces crack tip shielding when hydrogen induced changes in the elastic moduli are considered. The implications of the elastic analysis of the interaction between hydrogen in equilibrium with local stresses near a crack tip on the fracture resistance of materials are discussed. Then results are examined in conjunction with the elastic-plastic deformation at the tip.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 771
  • 1994-6027
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112465
Sponsor(s)/Grant Number(s)
Energy Department 94/10
Copyright and License Information
Copyright 1994 Board of Trustees of the University of Illinois

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Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.