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Blunt or Sharp Indenters: A Size Transition Analysis
Author(s) -
MOUGINOT RÉMI
Publication year - 1988
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.1151-2916.1988.tb06384.x
Subject(s) - materials science , radius , conical surface , von mises yield criterion , brittleness , fracture (geology) , ceramic , deformation (meteorology) , composite material , forensic engineering , structural engineering , engineering , finite element method , computer science , computer security
The first event occurring in a glass or a ceramic material beneath a blunt punch is conical crack initiation and beneath a sharp punch is plastic deformation. These behaviors are here analyzed as punch size transition. The transition radius of the punch is determined by using the method first proposed by Kendall (1978), based on both fracture (Griffith) criterion and yield (Von Mises) criterion analyses. The effect of the punch geometry or of the punch sliding is computed. The transition radius appears then as a quantitative brittleness indicator, which also provides a mechanical definition for the sharpness or the bluntness of the punch.