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

Abstract:

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.

• Periodical: Defect and Diffusion Forum (Volume 294)
• Pages: 39-47
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.294.39
• Online since: December 2009
• Authors: K.C. Liao
• Keywords: Anisotropy Parameter, J-Integral, Multiaxial Fatigue, Porous Material

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