WSEAS Transactions on Applied and Theoretical Mechanics
Print ISSN: 1991-8747, E-ISSN: 2224-3429
Volume 8, 2013
Evaluation of Mixed-Mode Stress Intensity Factor of Wood from Crack-Tip Displacement Fields Utilizing Digital Image Correlation
Authors: Jian Zhao, Dong Zhao
Abstract: The effects of anisotropy and varying initial crack angle during mixed mode tension loading were studied in Dahurian Larch wood. The mixed mode stress intensity factors (SIFs) were calculated using displacements from digital image correlation. With the crack angle increasing, the SIF of mode I in unilateral crack increase all along, but the SIF of mode II in unilateral crack shows an initial increase, followed by a decrease. Crack-tip plastic zones were determined using an anisotropic yield criterion. Strains in the plastic zone obtained from digital image correlation showed that the varying angles of crack growth have on the asymmetry of the plastic zone. Experimental results reveal that the DIC method is a practical and effective technique for SIF and crack-tip plastic size measurement.
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Keywords: Digital image correlation, Stress intensity factor, Mixed mode, Crack-tip plastic zone