Abstract
We discuss the relative contributions of glass deformation (governed by hardness or uniaxial yield stress) and glass fracture (governed by fracture toughness) in determining the overall deformation of surfaces. Whereas microindentation and grinding necessarily couple deformation and fracture, we show that nanoindentation of patterned optical surfaces allows the separate estimates of deformation and fracture of optical materials. In other words, a patterned surface may separately exhibit ductile or brittle behavior.
© 2012 Optical Society of America
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