RESEARCH AND DEVELOPMENT ON ADVANCED GRAPHITE MATERIALS. VOLUME II. APPLICATIONS OF ANISOTROPIC ELASTIC CONTINUUM THEORY TO DISLOCATIONS IN GRAPHITE
Eshelby, Read, and Shockley's theory of dislocations in an anisotropic elastic continuum was used to derive formulas not involving complex numbers for the stresscomponents of straight dislocations in certain symmetry directions. From these the dependence of stacking fault energy gamma /sub F/ on the orientation of the Burgers vector and on the width of extended dislocations and triple partial ribbons and the dependence of gamma /sub F/ on the radius of curvature of extended nodes were calculated. The results are rigorous for hexagonal crystals and approximate for general directions in (1 1 1) planes of FCC crystals. The theory is applied to graphite and close-packed metals. All three methods of determining gamma /sub F/ for graphite yield results which are compatible with the value 0.6 plus or minus 0.2 erg/cm/sup 2/. Several examples of the dependence of width of a dislocation on depth from a stress-free surface were calculated. (auth)
- Research Organization:
- National Carbon Co. Research Lab., Parma, Ohio
- DOE Contract Number:
- AF33(616)-6915
- NSA Number:
- NSA-17-000544
- OSTI ID:
- 4779077
- Report Number(s):
- WADD-TR-61-72(Vol.II)
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- United States
- Language:
- English
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