Transition in material removal behavior during repeated scratching of optical glasses

摘要

When indented or scratched, ceramics and glasses often exhibit distinct transition(s) in behavior as a function of the load on the abrasive or depth of its penetration. This behavior has important practical consequences in both material fabrication and wear. For example, so-called ductile mode grinding is dependent on reducing the depth of cut below a critical value so that a relatively damage free and smooth surface is produced. Transitions in behavior have been extensively studied using indentation and scratching on polished surfaces. However, in most practical wear, grinding, and polishing applications, scratching actually occurs on surfaces with existing damage.