Cohesive zone modeling of hydrogen-induced stress cracking in 25% Cr duplex stainless steel

Hydrogen-influenced cohesive zone elements are implemented in finite element models of rectangular notched tensile specimens of 25% Cr stainless steel. A three-step procedure consisting of stress analysis, diffusion analysis and cohesive zone fracture initiation analysis was performed. A linear trac...

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Bibliographic Details
Published inScripta materialia Vol. 57; no. 7; pp. 615 - 618
Main Authors Olden, Vigdis, Thaulow, Christian, Johnsen, Roy, Østby, Erling
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.10.2007
Subjects
Chromium
Cohesion
Cohesive zone modeling
Crack initiation
Diffusion
Environmentally assisted cracking
Fracture mechanics
Mathematical analysis
Pipelines
Separation
Stainless steels
Structural assessment
Cohesive zone modeling
Environmentally assisted cracking
Structural assessment
Pipelines
Stainless steels
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Summary:Hydrogen-influenced cohesive zone elements are implemented in finite element models of rectangular notched tensile specimens of 25% Cr stainless steel. A three-step procedure consisting of stress analysis, diffusion analysis and cohesive zone fracture initiation analysis was performed. A linear traction separation law gives a good fit with experimental results for stress levels just below the material yield stress. Hydrogen concentrations of 40 ppm at the surface and 1 ppm in bulk always produces crack initiation at the surface.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2007.06.006