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An experimental approach has been used to measure the threshold stress intensity factor ( K th ) for subcritical crack growth in brittle materials using indentation cracks. The data show that K th values existed in soda‐lime‐silica and soda‐alumina‐silica glasses that were tested in a neutral aqueous environment. For the former glass, tests also were performed in acidic and basic solutions. A threshold for subcritical crack growth was observed for acidic conditions but not for alkaline conditions.
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Sglavo et al. (1999) studied this question.
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