Premium
Residual Strength of a Low‐Strength Ceramic with a Precrack Induced by Thermal Shock
Author(s) -
Jin Xinxin,
Zhang Xinghong,
Han Jiecai,
Hu Ping,
Wang Lingling
Publication year - 2014
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/jace.12845
Subject(s) - materials science , thermal shock , brittleness , composite material , residual strength , ceramic , fracture toughness , finite element method , shock (circulatory) , graphite , toughness , residual stress , residual , structural engineering , mathematics , medicine , algorithm , engineering
A method of introducing a single sharp crack with controllable length and position in brittle materials by thermal shock is proposed. This method is simple to conduct and suitable for the precise testing of critical fracture parameters, with accurate values of fracture toughness of brittle ceramics, such as ZrB 2 – SiC –graphite ( ZSG ), able to be obtained. Moreover, this provides an experiment foundation for the study of the relationship between mechanical properties and cracks: The effects of crack length and specimen thickness on the residual strength of ZSG were investigated here. Further comparison between the experimental data and the results of the extended finite‐element calculation was made. Through proper control over the thermal shock, a desired number of uniformly distributed and roughly parallel cracks can be obtained.