Paper Title:
Mutiscale Plastic Deformation near a Fatigue Crack from Diffraction
  Abstract

After an overload was imposed during a constant amplitude fatigue experiment, a retardation period was observed. The deformation in the vicinity of a crack tip was studied using neutron and x-ray microbeam-diffraction techniques, which provide millimeter and submicrometer spatial resolutions, respectively. From the neutron-diffraction measurements, compressive lattice strains and higher dislocation densities at the macroscale were observed in front of the crack tip, which indicates a plasticity induced crack-closure phenomenon. Furthermore, Laue patterns obtained from the microbeam diffraction at different locations near the crack tip show alternating regions with high and low dislocation densities at the mesoscale.

  Info
Periodical
Solid State Phenomena (Volume 129)
Edited by
R. Kozubski, G.E. Murch and P. Zięba
Pages
151-156
DOI
10.4028/www.scientific.net/SSP.129.151
Citation
Y. Sun, R. Barabash, H. Choo, P. K. Liaw, Y. Lu, D. W. Brown, G. E. Ice, "Mutiscale Plastic Deformation near a Fatigue Crack from Diffraction ", Solid State Phenomena, Vol. 129, pp. 151-156, 2007
Online since
November 2007
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$32.00
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