Abstract
A theory is proposed to predict the initiation of fatigue cracks using cyclic dislocation dynamics (DD) simulations. The evolution of dislocation networks in a grain is simulated over several cycles. It is shown that the dislocation density and the energy stored in the dislocation networks increase with the number of cycles. The results of the DD simulations are used to construct an energy balance expression for crack initiation. A hypothetical crack is inserted into the grain, and the Gibbs energy consisting of the energy of the dislocation structure, the surface energy of the hypothetical crack, and the reduction in continuum energy is evaluated. Once the Gibbs energy attains a maximum, the dislocation structure becomes unstable, and it becomes energetically more favorable to form a real crack. The proposed method is applied to oxygen-free high conductivity copper, and the results are compared against experiments. Finally, it is shown how the method can be amended to account for environmental effects.
Acknowledgments
This work was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award #DE-SC0008637 as part of the Center for Predictive Integrated Structural Materials Science (PRISMS Center) at the University of Michigan.
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©2017 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- In this issue
- Editorial
- International Symposium on Environmental Degradation under Static and Cyclic Loads in Structural Metallic Materials at Ambient Temperatures IV (Cork, Ireland, May 29–June 3, 2016)
- Overview
- Failures of metallic components involving environmental degradation and material- selection issues
- Environment-induced crack initiation
- Modeling galvanic coupling and localized damage initiation in airframe structures
- Electrochemical investigation of corrosion and repassivation of structural aluminum alloys under permanent load in bending
- Environment-induced crack growth
- Relationship between electrochemical processes and environment-assisted crack growth under static and dynamic atmospheric conditions
- Subcritical crack growth and crack tip driving forces in relation to material resistance
- Impact of solution conductivity and crack size on the mechanism of environmentally assisted crack growth in steam turbines
- Pre-exposure embrittlement of a commercial Al-Mg-Mn alloy, AA5083-H131
- Stress corrosion characteristics of AL-Li-X alloys: role of GB precipitate size and spacing
- Environmentally assisted cracking of pipeline steels in CO2 containing environment at near-neutral pH
- Corrosion fatigue
- A method to predict fatigue crack initiation in metals using dislocation dynamics
- A numerical model to assess the role of crack-tip hydrostatic stress and plastic deformation in environmental-assisted fatigue cracking
- Examination and prediction of corrosion fatigue damage and inhibition
Artikel in diesem Heft
- Frontmatter
- In this issue
- Editorial
- International Symposium on Environmental Degradation under Static and Cyclic Loads in Structural Metallic Materials at Ambient Temperatures IV (Cork, Ireland, May 29–June 3, 2016)
- Overview
- Failures of metallic components involving environmental degradation and material- selection issues
- Environment-induced crack initiation
- Modeling galvanic coupling and localized damage initiation in airframe structures
- Electrochemical investigation of corrosion and repassivation of structural aluminum alloys under permanent load in bending
- Environment-induced crack growth
- Relationship between electrochemical processes and environment-assisted crack growth under static and dynamic atmospheric conditions
- Subcritical crack growth and crack tip driving forces in relation to material resistance
- Impact of solution conductivity and crack size on the mechanism of environmentally assisted crack growth in steam turbines
- Pre-exposure embrittlement of a commercial Al-Mg-Mn alloy, AA5083-H131
- Stress corrosion characteristics of AL-Li-X alloys: role of GB precipitate size and spacing
- Environmentally assisted cracking of pipeline steels in CO2 containing environment at near-neutral pH
- Corrosion fatigue
- A method to predict fatigue crack initiation in metals using dislocation dynamics
- A numerical model to assess the role of crack-tip hydrostatic stress and plastic deformation in environmental-assisted fatigue cracking
- Examination and prediction of corrosion fatigue damage and inhibition