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TECHNICAL PAPERS

On Void Growth in Elastic-Nonlinear Viscous Solids Under Creep and Cyclic Creep Conditions

[+] Author and Article Information
R. Mohan

Rouge Steel Company, 3001 Miller Rd., Dearborn, MI 48121

F. W. Brust

Engineering Mechanics Department, Battelle, Columbus, OH 43201

J. Eng. Mater. Technol 122(3), 283-293 (Mar 13, 2000) (11 pages) doi:10.1115/1.482813 History: Received December 28, 1999; Revised March 13, 2000
Copyright © 2000 by ASME
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References

Figures

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(a) Periodically spaced spherical voids along the grain boundary, (b) axisymmetric approximation of the void
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Finite element mesh of the axisymmteric unit cell model
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Effect of elasticity on the variation of void aspect ratio with far-field creep strain for a0/b0=0.1. Several values of triaxialities are considered. (a) n=5 and (b) n=10
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Effect of the creep exponent on the variation of void aspect ratio with far-field creep strain for a0/b0=0.1. Several values of triaxialities are considered.
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Effect of elasticity on the variation of void aspect ratio with far-field creep strain for a0/b0=0.25 and n=5. Several values of triaxialities are considered.
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Variation of void growth rates with far-field creep strain for a0/b0=0.1 and n=10. Also plotted in the figures are the predictions of Budiansky et al. 6 and Van der Giessen et al. 29. (a) T/S=0.75, (b) T/S=0.6, and (c) T/S=0.
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Contours of hydrostatic stress normalized with far-field effective stress are shown at several stages of growth for T/S=0.75 and n=10 at, (a) ε=0.006, (b) ε=0.01, and (c) ε=0.0183
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Contours of hydrostatic stress normalized with far-field effective stress are shown at several stages of growth for T/S=0.6 and n=10 at, (a) ε=0.048, (b) ε=0.161 and (c) ε=0.183
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Contours of hydrostatic stress normalized with far-field effective stress are shown at several stages of growth for T/S=0 and n=10 at, (a) ε=0.194, (b) ε=0.646, and (c) ε=1.14
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Schematic sketch of strain-controlled balanced cycling
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Variation of normalized cavity volume with loading cycles for balanced strain cycling
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Changes in aspect ratio of the cavity with loading cycles for balanced strain cycling
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Variation of the ratio of current cavity size to mean spacing along the grain boundary with loading cycles
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Variation of normalized cavity volume with loading cycles for the cases involving initial tensile and initial compression waves (nonlinear shape changes are accounted for each of these cases)
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Variation of aspect ratio of the cavity with loading cycles for the cases involving initial tensile and initial compression waves (nonlinear shape changes are accounted for each of these cases)

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