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The Nature of Crack Tip Fields in Atomic Scale Models of Aluminum

Published online by Cambridge University Press:  16 February 2011

R. G. Hoagland ,
M. S. Daw ,
S. M. Foiles  and
M. I. Baskes
R. G. Hoagland
Affiliation:
Department of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164–2920
M. S. Daw
Affiliation:
Sandia Natinal Laboratories, Livermore, CA 94551–0969
S. M. Foiles
Affiliation:
Sandia Natinal Laboratories, Livermore, CA 94551–0969
M. I. Baskes
Affiliation:
Sandia Natinal Laboratories, Livermore, CA 94551–0969
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Abstract

The stresses, displacement gradients, and Eshelby's F and M integrals are obtained for two crack orientations in an EAM atomic model of aluminum. For a sharp crack, the stresses are shown to agree quite well with the linear elastic prediction, and F is essentially path independent and also in good agreement with the linear elastic prediction. When dislocation emission and blunting ensues, the path independence of F disappears. In addition, for circular contours with origin at the crack tip, the M-integral is linear in contour radius with slope equal to twice the surface energy and zero intercept for a sharp crack, but acquires a nonzero intercept as blunting occurs. The shift in intercept is related to the movement of singularities away from the origin.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 193: Symposium Q – Atomic Scale Calculations of Structure in Materials , 1990 , 283
Copyright
Copyright © Materials Research Society 1990

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References

REFERENCES

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