Effect of material plasticity on fatigue crack propagation under complex stress state

The maximum energy release rate criterion, i.e., Gmax criterion, is commonly used for crack propagation analysis. However, this fracture criterion is based on the elastic macroscopic strength of materials. In the present investigation, a modification has been made to Gmax criterion to implement the...

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Bibliographic Details
Published in:International journal of fracture 2007-07, Vol.146 (1-2), p.19-32
Main Author: Bian, Lichun
Format: Article
Language:English
Subjects:
Crack propagation
Criteria
Energy release rate
Exact sciences and technology
Fatigue cracks
Fatigue failure
Fracture mechanics
Fracture mechanics (crack, fatigue, damage...)
Fracture toughness
Fundamental areas of phenomenology (including applications)
Inelasticity (thermoplasticity, viscoplasticity...)
Material properties
Mathematical models
Mechanical properties
Physics
Plastic deformation
Propagation
Solid mechanics
Static elasticity (thermoelasticity...)
Steel pipes
Strain hardening
Stress intensity factors
Stress propagation
Structural and continuum mechanics
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Summary:The maximum energy release rate criterion, i.e., Gmax criterion, is commonly used for crack propagation analysis. However, this fracture criterion is based on the elastic macroscopic strength of materials. In the present investigation, a modification has been made to Gmax criterion to implement the consideration of the plastic strain energy. This criterion is extended to study the fatigue crack growth characteristics of mixed mode cracks in steel pipes. To predict crack propagation due to fatigue loads, a new elasto-plastic energy model is presented. This new model includes the effects of material properties like strain hardening exponent n, yield strength σy and fracture toughness and stress intensity factor ranges. The results obtained are compared with those obtained using the commonly employed crack growth law and the experimental data.
ISSN:0376-9429
1573-2673
DOI:10.1007/s10704-007-9127-9