Paper Title:
Crack Tip Dislocations and its Shielding Effect
  Abstract

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, Y. Hoshino, A. Hartmaier, K. Higashida, "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
$32.00
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