Mixed‐Mode Fracture in Soda‐Lime Glass

Abstract
Soda‐lime‐silica glass was fractured under combined mode I and mode II loading from flaws produced by hardness indentations. Critical stress intensities calculated from K1and K11combined using four analyses, are compared to KICmeasured by a fracture mechanics technique and to values of KICdetermined by measuring fracture‐mirror size. The comparison showed that KICcalculated using a noncoplanar strain‐energy release‐rate analysis gave the best agreement with values obtained by fracture mechanics techniques over the widest range of crack orientations. KICcalculated from mirror sizes was constant regardless of the orientation of the original flaw.

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