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Contact with gypsum powder makes cracks in face

Apr 28, 2020

Dec 27, 2016 However, some flaw tips only had primary cracks. Gypsum powder was observed in the aperture of the flaws during the test. According to the observation by Bobet and Einstein , generation of gypsum powder is a sign of shear crack development around a flaw. The occurrence of a shear crack is always associated with surface spalling

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