Film rupture model for aqueous stress corrosion cracking under constant and variable stress intensity factor

• Published in: Corrosion science Vol. 51; no. 2; pp. 225 - 233
• Main Author: Hall, M.M.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-02-2009; Elsevier
• Subjects: A. Stainless steel; Applied sciences; B. Modelling studies; C. Anodic films; C. Effects of strain; C. Stress corrosion; Corrosion; Corrosion environments; Exact sciences and technology; Fractures; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; C. Stress corrosion; C. Anodic films; B. Modelling studies; C. Effects of strain; A. Stainless steel; Oxide layer; Rupture; Mechanical properties; Stress corrosion cracking; Modeling; Stress intensity factor; Corrosion; Stainless steel; Variable load; Anodic oxide
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2008.08.052

A film rupture model for aqueous stress corrosion cracking is developed and used to predict kinetics of crack growth under constant and variable stress intensity factor. The model predicts that creep is necessary for sustained crack growth and creep rate limits crack velocity for constant
K and
dK/
da loading. Contrary to recent thinking, the crack tip strain due to crack advance is viewed as a result, not a cause of crack growth. The crack tip strain gradient elevates and maintains crack tip stress as the crack propagates, which enables creep and sustained crack growth. The model provides a basis for understanding effects of positive and negative
K – variation on crack growth.