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Indentation Creep of Na 2 O · 3SiO 2 Glasses with Various Water Contents
Author(s) -
Han WonTaek,
Tomozawa Minoru
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb04268.x
Subject(s) - indentation , creep , materials science , conical surface , composite material , viscous flow , deformation (meteorology) , newtonian fluid , yield (engineering) , plasticity , flow (mathematics) , forensic engineering , mechanics , physics , engineering
Time‐dependent deformation behavior induced by an indentation, called indentation creep, was investigated for Na 2 O · 3SiO 2 glasses with various water contents by measuring the indentation depth as a function of time using a conical indenter. It was found that the indentation creep behavior of the glasses could be best explained as steady‐state inhomogeneous (non‐Newtonian viscous) flow. Water in the glasses appeared to reduce the stress (or yield stress) needed to cause this flow. Crack initiation of the glasses was promoted by water through this inhomogeneous flow.