Crack Tip Dislocations and its Shielding Effect

Abstract:

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Two dimensional simulations of discrete dislocation dynamics were carried out to clarify a shielding effect due to dislocations at a crack tip. The configuration of dislocations around the crack tip was calculated under the conditions of mode I tensile load at high temperatures. The stress field around the crack tip due to dislocations was found to be compressive, accommodating mode I stress intensity at the crack tip. In order to experimentally confirm the stress accommodation, infrared photoelastic observation was also performed in a specimen pre-deformed at high temperatures. The experimental result is in good agreement with a simulated infrared photoelastic image derived from the stress field calculated.

Info:

Periodical:

Materials Science Forum (Volumes 561-565)

Main Theme:

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee

Pages:

1833-1836

DOI:

10.4028/www.scientific.net/MSF.561-565.1833

Citation:

M. Tanaka et al., "Crack Tip Dislocations and its Shielding Effect", Materials Science Forum, Vols. 561-565, pp. 1833-1836, 2007

Online since:

October 2007

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Price:

$35.00

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