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Effects Of Externally Generated Dislocations On Brittleness/Ductility Of Crystals

Published online by Cambridge University Press:  15 February 2011

Sinisa DJ. Mesarovic
Sinisa DJ. Mesarovic*
Affiliation:
Harvard Univ., Div. of Appl. Sciences, Cambridge, MA 02138, mesarovic@husm.harvard.edu
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Abstract

Direct interactions of externally generated dislocations with a moving, non-emitting crack tip, have been investigated. Dislocations of the appropriate Burgers vector, initially residing in a strip ahead of the incoming crack tip, are funneled toward the tip, with their motion restricted to the slip plane. Once drawn into the vicinity of the tip, these dislocations inevitably cause local, atomic scale blunting of the tip. The resulting crack trapping process is modelled, resulting in the temperature, crack velocity, and dislocation density dependent, tip toughness.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 409: Symposium Q – Fracture-Instablility Dynamics, scaling and Ductile/Brittle Behavior , 1995 , 63
Copyright
Copyright © Materials Research Society 1996

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References

[1] Rice, J.R. and Thomson, R.M. (1974) Phil. Mag. 29, pp. 73–97.Google Scholar
[2] Rice, J.R. (1992) J.Mech. Phys. Solids 40, pp. 239–271.Google Scholar
[3] Hirsch, P.B. (1995) In Plastic Deformation of Ceramics. Bradt, R.C., Brookes, C.A., and Routbert, J.L., Eds. Plenum, New York.Google Scholar
[4] Beardmore, P. and Hull, D. (1967) In Refractory Metals and Alloys IV, AIME Symp., Amer. Inst. Mining & Metall. Eng., New York.Google Scholar
[5] Hull, D., Beardmore, P., and Valentine, A.P. (1965) Phil. Mag. 12, p. 1021.Google Scholar
[6] Liu, J.M. and Shen, B.W. (1984) Metall. Trans. 15A, p. 1247.Google Scholar
[7] Pickington, R. and Hull, D. (1968) In Conf. on Fract. Toughness, Iron and Steel Inst. 20, p. 5.Google Scholar
[8] Wang, J.S. (1994) Proc. 5th Int. Conf. in Hydrogen Effects on Material Behavior, Moran, WY. Moody, W.R., and Thompson, A.W., Eds., TMS, Warrendale, PA.Google Scholar
[9] Leslie, W.C. (1972) MetalL. Trans. 3, p. 5.Google Scholar
[10] Ashby, M.F. and Embury, J.D. (1985) Scripta Metall., 19, 557–562.Google Scholar
[11] Freund, L.B. and Hutchinson, J.W. (1985) J. Mech. Phys. Solids 33 (2), pp. 169–191.Google Scholar
[12] Beltz, G.E., Rice, J.R., Shih, C.F., and Xia, L. (1995) To appear in Acta Metall.Google Scholar
[13] Tvergaard, V. and Hutchinson, J.W. (1992) J.Mech. Phys. Solids 40, p. 1377.Google Scholar
[14] Tetelman, A.S. (1964) Acta Metall. 12, p. 993.Google Scholar
[15] Hull, D., and Beardmore, P. (1966) Int. J. Fract. Mech. 2(1), pp. 468–486.Google Scholar
[16] Lin, I.-H., and Thomson, R. (1986) Acta Metall. 34 (5), pp. 187–206.Google Scholar
[17] Frost, H.J. and Ashby, M.F. (1982) Deformation-Mechanism Maps, Pergamon Press, New York.Google Scholar
[18] Hirth, J.P. and Lothe, J. (1982) Theory of Dislocations, John Wiley & Sons, New York.Google Scholar
[19] Mesarovic, S.Dj. (1996) Submitted to J.Mech. Phys. Solids.Google Scholar
[20] Mower, T.M. and Argon, A.S. (1995) Mechanics of Materials 19, pp. 343–364.Google Scholar
[21] Curry, D.A. and Knott, J.F. (1978) Metal Science 12, pp. 511–514.Google Scholar