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Direct observation of indentation deformation and cracking of silicate glasses

Published online by Cambridge University Press:  03 August 2015

Satoshi Yoshida ,
Mitsuo Kato ,
Akiko Yokota ,
Shohei Sasaki ,
Akihiro Yamada ,
Jun Matsuoka ,
Naohiro Soga  and
Charles R. Kurkjian
Satoshi Yoshida*
Affiliation:
Center for Glass Science and Technology, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan; and Department of Materials Science, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan
Mitsuo Kato
Affiliation:
Center for Glass Science and Technology, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan
Akiko Yokota
Affiliation:
Center for Glass Science and Technology, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan
Shohei Sasaki
Affiliation:
Department of Materials Science, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan
Akihiro Yamada
Affiliation:
Center for Glass Science and Technology, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan; and Department of Materials Science, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan
Jun Matsuoka
Affiliation:
Center for Glass Science and Technology, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan; and Department of Materials Science, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan
Naohiro Soga
Affiliation:
Center for Glass Science and Technology, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan
Charles R. Kurkjian
Affiliation:
Rutgers University, New Brunswick, New Jersey 08854, USA
*
a)Address all correspondence to this author. e-mail: yoshida@mat.usp.ac.jp
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Abstract

Indentation deformation of glass under a sharp diamond indenter causes cracking during and after a loading–unloading cycle. To get a deeper insight into the indentation cracking in glass, it is critical to understand the elastic and inelastic deformation behavior of glass under the indenter. In this study, in situ observations during Vickers indentations are carried out for silica, soda-lime, and lead–silicate glasses. It is found that the true contact area during indentation is different from the area estimated from the contact depth and the indenter geometry, and that the ridges of a Vickers indenter affect the contact shape during indentation. The contact region of silicate glasses under a Vickers indenter is not a regular square but a concave square. This results in edge cracking during indentation. It is concluded that the contact shape and the deformation mechanism of glass under the indenter are closely related to its cracking behaviors.

Keywords

amorphoushardnessfracture
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 15 , 14 August 2015 , pp. 2291 - 2299
Copyright
Copyright © Materials Research Society 2015 

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References

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