Dislocation Shielding of a Crack in a Quasi Continuum Approximation
NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD
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Earlier predictions of toughness by Thomson and Weertman are reviewed. The differing predictions of the two authors are shown to be due to different interpretations of the functional dependence of the size of the elastic region on intrinsic surface energy. An analysis of the quasi continuum model in terms of dislocation rearrangements is given, and the nature of the boundary condition on the elastic enclave boundary is discussed.
- Numerical Mathematics