Materials Characterization Studies for Single Point Machining of Cooled Optics

摘要

Objective was to determine the physical properties of new materials being developed for high energy laser mirrors, especially CVD prepared silicon (Si) and silicon carbide (SiC). The properties investigated were those considered important in considering single point machining of the materials. A list of the materials studied and values for the various properties studied are given. This report centers on the development of a simplified model which can account for the mechanism that is responsible for the initial growth of lateral cracks during the machining of ceramic surfaces by a single point machining indentation mechanism, assuming a state of plastic-elastic residual stress beneath the indentation. Emphasis is placed on the interpretation of indentation damage. (ERA citation 12:031135)