Computer-Aided, Single-Specimen Controlled Bending Test for Fracture-Kinetics Measurement in Ceramics |
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Authors: | Valeri G Borovik Victor M Chushko Sergei P Kovalev |
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Affiliation: | Institute for Problems of Strength, Academy of Sciences of Ukraine, 252014 Kiev-14, Ukraine |
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Abstract: | Fracture testing of ceramics by using controlled crack growth is proposed to allow study of crack-kinetics behavior under a given loading history. A computer-aided, real-time data acquisition system improves the quality of crack-growth parameters obtained in a simple, single-specimen bend test. Several ceramic materials were tested in the present study: aluminum nitride as a linear-elastic material; and alumina and yttria-stabilized zirconia, both representative of ceramics with microstructure-dependent nonlinear fracture properties. Ambiguities in the crack-growth diagrams are discussed to show the importance of accounting for crack-growth history in correctly describing nonequilibrium fracture behavior. |
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