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Combined Mode I and Mode II Fracture of Monolithic Ceramics
Author(s) -
Tikare Veena,
Choi Sung R.
Publication year - 1993
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.1151-2916.1993.tb07763.x
Subject(s) - materials science , fracture toughness , ceramic , composite material , silicon nitride , indentation , fracture (geology) , flexural strength , bending , enhanced data rates for gsm evolution , ultimate tensile strength , mode (computer interface) , telecommunications , layer (electronics) , computer science , operating system
The mode I, mode II, and combined mode I–mode II fracture behaviors of a coarse‐grained silicon nitride, a fine‐grained silicon nitride, and an alumina were investigated. These ceramics were fractured from two types of fracture initiating flaws: small surface flaws and large single edge precracks. The small surface flaws were introduced by Knoop indentation in flexural samples at various angles to the tensile stress direction and fractured in four‐point bending. The samples with large precracks were fractured in the asymmetric four‐point‐bend geometry. The mixed‐mode fracture toughness values obtained from the two flaw configurations were in good agreement with each other. All three ceramics displayed very similar mixed‐mode fracture behavior, although their microstructures were not similar. Comparison of experimental data to mixed‐mode fracture theories revealed that the minimum strain energy density theory best described the mixed‐mode fracture behavior of all three ceramics.