Abstract
The normalized crack tip stress intensity for the double cleavage drilled compression (DCDC) specimen is characterized as a function of crack length by both experimental and numerical means. The experimental calibration is based on measurements of the critical applied load to produce crack growth in silica glass in an ultra high vacuum environment. Results from the experimental calibration are in good agreement (within 10%) with a finite element analysis of the crack tip stress intensity ( K I ) using the ABACUS code. The results indicate that K I is strongly dependent upon the ratio of the hole size to the sample width used in the DCDC sample geometry even for cracks which are long with respect to the hole diameter.
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