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Mobility of Non-Planar Screw Dislocations ahead of a Mode III Crack Tip

  • A.H.W. Ngan (a1) and H.F. Zhang (a1)


The generalised Peierls-Nabarro model is used to study the transformation of screw dislocation cores from the three-fold, non-planar state to the planar, glissile state ahead of a mode mll crack tip.



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1. Weertman, J., Phil. Mag. A, 43, 1103 (1981).
2. Schoeck, G., Phil. Mag. A, 63, 111 (1991).
3. Rice, J.R., J. Mech. Phys. Solids, 40, 239 (1992).
4. Ngan, A.H.W., Phil. Mag. Lett., 72, 207 (1995).
5. Ngan, A.H.W., J. Mech. Phys. Solids, 45, 903 (1997).
6. Ngan, A.H.W. and Zhang, H.F., to appear in Mech. Mater.


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