Abstract

Indentation regions were formed in glass by pressing a hardened steel ball into the surface using loads below the fracture limit. These indented regions were found to recover with time and the process was studied with optical interference methods. A linear relationship was found between the logarithm of the depth of the indentation and the logarithm of the elapsed time after the load removal. The maximum load studied was about 5×105 psi. The indentation effect could still be observed at loads around 1×105 psi.

© 1959 Optical Society of America

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