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Contact‐Induced Failure of Prestressed Glass Plates
Author(s) -
CHANTIKUL P.,
LAWN B. R.,
MARSHALL D. B.
Publication year - 1979
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.1151-2916.1979.tb19073.x
Subject(s) - indentation , materials science , brittleness , composite material , fracture toughness , ultimate tensile strength , ceramic , fracture (geology) , catastrophic failure , forensic engineering , engineering
An indentation fracture technique was used to determine critical contact conditions under which prestressed brittle surfaces are subject to catastrophic failure. A theoretical model based on the growth of a well‐developed, contact‐induced half‐penny crack leads to a simple inverse‐cube power relation between indentation load and tensile prestress. The analysis is developed in terms of fracture parameters which are readily calibrated in routine indentation/strength tests. Experiments on glass disks loaded simultaneously in biaxial flexure and Vickers indentation confirm the essential failure predictions of the theory; toughness is the key material parameter controlling resistance to failure. The results emphasize the danger of spurious tensile stresses in ceramic systems exposed to severe contact events.