Indentation fracture of brittle materials.

摘要

The response of four transparent materials, soda-lime glass, fused silica, single crystal (0001) Al(sub 2)O(sub 3) and Y(sub 2)O(sub 3)-ZrO(sub 2), to contact by a sharp indenter has been studied. In-situ observation and continuous monitoring of the load and displacement throughout the test allowed the indentation fracture sequence of the transparent materials to be characterized and also permitted the effects of these fracture events on the corresponding load displacement curves to be noted. It was found that if the cracks produced during indentation grew discontinuously, they manifested themselves in discontinuities in displacement on the corresponding load-displacement curve. 6 refs., 5 figs., 1 tab.