Elastic behaviour of an edge dislocation near a sharp crack emanating from a semi-elliptical blunt crack

doi:10.1088/1674-1056/19/1/016102

Abstract The interaction between an edge dislocation and a crack emanating from a semi-elliptic hole is dealt with. Utilizing the complex variable method, closed form solutions are derived for complex potentials and stress fields. The stress intensity factor at the tip of the crack and the image force acting on the edge dislocation are also calculated. The influence of the morphology of the blunt crack and the position of the edge dislocation on the shielding effect to the crack and the image force is examined in detail. The results indicate that the shielding or anti-shielding effect to the stress intensity factor increases acutely when the dislocation approaches the tip of the crack. The effect of the morphology of the blunt crack on the stress intensity factor of the crack and the image force is very significant.

Keywords: edge dislocation blunt crack shielding effect image force

Received: 26 October 2008
Revised: 03 July 2009
Accepted manuscript online:

PACS:	61.72.Bb	(Theories and models of crystal defects)
	61.72.Lk	(Linear defects: dislocations, disclinations)
	62.20.M-	(Structural failure of materials)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10872065 and 50801025).

Cite this article:

Fang Qi-Hong(方棋洪), Song Hao-Peng(宋豪鹏), and Liu You-Wen(刘又文) Elastic behaviour of an edge dislocation near a sharp crack emanating from a semi-elliptical blunt crack 2010 Chin. Phys. B 19 016102

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Elastic behaviour of an edge dislocation near a sharp crack emanating from a semi-elliptical blunt crack

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