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In situ observations of cracking in constrained sintering
Author(s) -
Carazzone Joseph R.,
Bonar Michael D.,
Baring Henry W.,
Cantu Mark A.,
Cordero Zachary C.
Publication year - 2019
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.15868
Subject(s) - cracking , materials science , sintering , aggregate (composite) , ceramic , creep , nucleation , composite material , fracture mechanics , fracture (geology) , jet (fluid) , mechanics , chemistry , physics , organic chemistry
Abstract In this paper, we examine the long‐standing problem of cracking during constrained sintering of a powder aggregate. Using binder jet 3D printing, we prepare ceramic green bodies in the form of center‐notched panels, then use in situ imaging to observe how cracks nucleate and grow from the notch as the material sinters under restraint. Quantitative image analysis allows us to identify important characteristics of the sinter‐cracking process, indicating a framework for analyzing the problem and developing methods for avoiding it, including representation of sinter‐cracking as a creep crack growth process, use of fracture mechanics parameters to design specimen geometries that do not exceed critical stress intensities, and the possibility of exploiting the inherently ductile nature of sinter‐cracking to mitigate damage.