Mutiscale Plastic Deformation near a Fatigue Crack from Diffraction

Abstract:

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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 et al., "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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$35.00

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