The failure sequence of thick soda-lime glass plates under indentation from tungsten carbide spheres at high loads is described. Failure shows a combination of features normally associated with either blunt or sharp indentation. and most occurs during unloading. In particular the effects of irreversible processes of flow. densification, fracture and interfacial slip during loading on the initiation and propagation of failure during unloading are described and discussed. [References: 7]
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