Dislocation Shielding of a Crack in a Quasi Continuum Approximation

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Abstract:

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.

Author(s):
Thomson, R. M. ; Fuller, Jr., E. R.
Author Organization(s):
NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD
Descriptive Note:
Conference paper
Supplementary Note:
Published in Micro and Macro Mechanics of Crack Growth, p49-59, 1981. Presented at a conference held in Louisville, KY on 13-15 Oct 1981.
Pagination:
0012

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
ARO-16810.1-MS
Contract/Grant Number(s):
MIPR-ARO-36-82
Monitor Series:
16810.1-MS, ARO
 Subject Terms
Joint Capability Areas:
JCA_5.3_Planning; JCA_5_Command and Control
Communities of Interest:
Air Platforms
Descriptor(s):
*CONTINUUM MECHANICS, *CRACK PROPAGATION, *MATHEMATICAL MODELS, CRACKING(FRACTURING), DISLOCATIONS, DUCTILITY, ELASTIC PROPERTIES, EQUILIBRIUM(GENERAL), METALLURGY, PLASTIC PROPERTIES, SHIELDING, SYMPOSIA, TOUGHNESS
Field(s)/Group(s):
Numerical Mathematics, Mechanics
Report Date:
1981 Jan 01