Elastic-Plastic Fracture Mechanics Model for Planar Isotropic Porous Materials with Small Mixed-Mode Cracks

Abstract:

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A porous panel with a small crack subjected to mixed-mode loads under yielding and plane stress conditions is examined here. The recently proposed modified Gurson’s yield criterion is adopted to account for the non-linear behavior of a porous panel with normal anisotropy but planar isotropy. Trends in the constant J contour, based upon a finite element analysis, are correlated with those of constant fatigue life contours under mixed-mode I and II loading conditions. The effects of both the anisotropy parameter and the porosity upon the J integral are then demonstrated. Simulation results show that the transverse strain dominates constant J contours on the -plane as the anisotropy parameter increases under the mixed-mode loads. However, constant J contours are less sensitive to the transverse strain even if a relatively larger void volume fraction appears in the panel.

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Periodical:

Edited by:

David J. Fisher

Pages:

39-47

DOI:

10.4028/www.scientific.net/DDF.294.39

Citation:

K.C. Liao "Elastic-Plastic Fracture Mechanics Model for Planar Isotropic Porous Materials with Small Mixed-Mode Cracks", Defect and Diffusion Forum, Vol. 294, pp. 39-47, 2009

Online since:

December 2009

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$35.00

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