AUTHOR=Yoshida Satoshi , Wada Ken , Fujimura Takahiro , Yamada Akihiro , Kato Mitsuo , Matsuoka Jun , Soga Naohiro 

TITLE=Evaluation of Sinking-In and Cracking Behavior of Soda-Lime Glass under Varying Angle of Trigonal Pyramid Indenter

JOURNAL=Frontiers in Materials

VOLUME=Volume 3 - 2016

YEAR=2016

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2016.00054

DOI=10.3389/fmats.2016.00054

ISSN=2296-8016

ABSTRACT=It is well known that glass undergoes elastic and inelastic deformation under a sharp diamond indenter.  Although brittle or less-brittle behavior of glass must be connected with such mechanical responses of glass under the indenter, there has been limited research on in-situ deformation behavior of glass during the loading and unloading indentation cycle.  This is because most indentation tests were conducted using a commercial hardness tester for which this information is not available.  In this study, the in-situ sinking-in region of glass during indentation test is determined using a custom-designed indentation microscope with trigonal pyramid indenters having different tip angles.  It is found that both the shape of contact region and the amount of sinking-in are affected by indenter geometries, and that the projected contact region of the glass sample under Berkovich indenter is not a regular triangle, but a concave triangle with bowed-in edges.  This is due to the larger amount of sinking-in under the face than under the ridge of indenter.  It is also found that these deformation behaviors of glass are inseparably linked with contact damage or cracking in glass.