Startseite Subcritical crack growth and crack tip driving forces in relation to material resistance
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Subcritical crack growth and crack tip driving forces in relation to material resistance

  • Kuntimaddi Sadananda , Kiran N. Solanki und Asuri K. Vasudevan EMAIL logo
Veröffentlicht/Copyright: 12. Juli 2017

Abstract

Basic concepts, related to the crack tip driving forces in relation to the material resistance, are analyzed for the elastic and elastic-plastic crack growth condition. This defines the crack initiation and growth conditions, as well as for crack arrest. Environment provides an additional driving force, thereby reducing the mechanical driving force required for the crack to grow. It is shown that (a) crack initiation and its growth are inseparable and (b) the magnitude of the applied and/or internal stresses; their gradients are also important for initiation and continuous growth of a crack. Elastic-plastic crack growth is also analyzed using the discrete dislocation models. The results show that its behavior is similar to that of an elastic crack. These concepts are valid for all subcritical crack growth. Mechanical and mechanical equivalent of chemical forces are defined for estimating the life prediction of a component in service. Failure diagrams are defined based on the extension of classical Kitagawa-Takahashi diagram that bridges the behavior of smooth and fracture mechanics specimens. Connections between crack initiation, growth, arrest, and overload fracture are established via these failure diagrams. Application of these diagrams for engineering components in service is outlined for diagnostic and prognostic purposes.

Acknowledgments

The authors acknowledge the financial support of the Office of Naval Research.

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Received: 2016-8-15
Accepted: 2017-4-4
Published Online: 2017-7-12
Published in Print: 2017-10-26

©2017 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. Frontmatter
  2. In this issue
  3. Editorial
  4. 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)
  5. Overview
  6. Failures of metallic components involving environmental degradation and material- selection issues
  7. Environment-induced crack initiation
  8. Modeling galvanic coupling and localized damage initiation in airframe structures
  9. Electrochemical investigation of corrosion and repassivation of structural aluminum alloys under permanent load in bending
  10. Environment-induced crack growth
  11. Relationship between electrochemical processes and environment-assisted crack growth under static and dynamic atmospheric conditions
  12. Subcritical crack growth and crack tip driving forces in relation to material resistance
  13. Impact of solution conductivity and crack size on the mechanism of environmentally assisted crack growth in steam turbines
  14. Pre-exposure embrittlement of a commercial Al-Mg-Mn alloy, AA5083-H131
  15. Stress corrosion characteristics of AL-Li-X alloys: role of GB precipitate size and spacing
  16. Environmentally assisted cracking of pipeline steels in CO2 containing environment at near-neutral pH
  17. Corrosion fatigue
  18. A method to predict fatigue crack initiation in metals using dislocation dynamics
  19. A numerical model to assess the role of crack-tip hydrostatic stress and plastic deformation in environmental-assisted fatigue cracking
  20. Examination and prediction of corrosion fatigue damage and inhibition
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