首页|Indentation Fracture in Brittle Rocks and Glasses,
Indentation Fracture in Brittle Rocks and Glasses,
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The nature of localized cracking about indentations in Westerly granite and silicate glass is examined. Characteristic fracture patterns are identified,with distinctions between 'sharp'and 'blunt'indenters, 'loading'and 'unloading'crack driving forces,providing the basis for classification. Indentation-induced surface-removal processes in brittle solids are then described in terms of tensile mode of failure,in which cracks initiate and propagate within an (approximately) radially diminishing contact field. In their well-developed form the indentation cracks tend to a certain geometrical similarity,which lends itself to a simple fracture mechanics analysis. Using glass as a model material,extensive measurements of crack size as a function of indentation load are presented in support of the similarity equations. Comparative observations of crack patterns in sectioned glass and granite specimens serve to demonstrate the applicability of the analysis to brittle rocks.
Martin Marietta Labs.,Baltimore,MD.**New South Wales Univ.,Kensington (Australia). School of Physics.*National Science Foundation,Washington,DC. Applied Science and Research Applications.
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