Advertisement

Journal of Materials Science

, Volume 43, Issue 19, pp 6500–6504 | Cite as

Importance of dislocation cores in fatigue fracture

  • J. J. GilmanEmail author
Article

Abstract

It is pointed out that proposed mechanisms of fatigue fracture should be consistent with Coffin’s Law for constant strain-amplitude cyclic deformation. Most proposed mechanisms are not. The fracture of dislocation cores along their glide planes is consistent with the fact that the law describes the behavior during the first ¼ cycle as well as that after a very large number of cycles. Experimental evidences of the relative weakness of edge dislocation cores is described. Analysis of this weakness by Bullough, and in this article, discussed. It is concluded that this effect plays an important role in fatigue fracture.

Keywords

Edge Dislocation Cyclic Deformation Dislocation Core Dislocation Dipole Local Cohesion 

References

  1. 1.
    Zener C (1946) Phys Rev 69:128CrossRefGoogle Scholar
  2. 2.
    Stroh AN (1954) Proc R Soc Lond 223A:404Google Scholar
  3. 3.
    Stroh AN (1959) Phil Mag Suppl 6(Part 24):418Google Scholar
  4. 4.
    Yoffe EH (1957) Phil Mag 2:1197CrossRefGoogle Scholar
  5. 5.
    Deruyttere A, Greenough GB (1956) J Inst Met 84:467Google Scholar
  6. 6.
    Gilman JJ (1958) Met Soc 212:783Google Scholar
  7. 7.
    Bullough R (1964) Phil Mag 9:917CrossRefGoogle Scholar
  8. 8.
    Bragg L, Lomer WM (1949) Proc R Soc Lond 196:171CrossRefGoogle Scholar
  9. 9.
    Lomer WM (1949) Proc R Soc Lond 196:182CrossRefGoogle Scholar
  10. 10.
    Koehler JS (1952) Phys Rev 85:480CrossRefGoogle Scholar
  11. 11.
    Nye JF (1953) Acta Metall 1:153CrossRefGoogle Scholar
  12. 12.
    Gilman JJ (1958) Trans Met Soc AIME 212:293Google Scholar
  13. 13.
    Gilman JJ (1961) J Appl Phys 32:738CrossRefGoogle Scholar
  14. 14.
    Spalding DR (1976) Phil Mag 34:1073CrossRefGoogle Scholar
  15. 15.
    Kachanov M (1987) Int J Sol Struct 23:23CrossRefGoogle Scholar
  16. 16.
    Liu SI, Lynch JJ, Ripling EJ, Sachs G (1948) Trans ASME 175:469Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Materials Science DepartmentUniversity of CaliforniaLos AngelesUSA

Personalised recommendations