UNIAXIAL COMPRESSION OF ALUMINA : STRUCTURE, MICROSTRUCTURE AND STRAIN RATE

Abstract : Two kinds of 99.7% pure alumina were studied under uniaxial compression. Three types of experiments were performed : quasi static tests with a compressing machine, Hopkinson Bar tests, Impacts onto long rods. These tests show that fracture strength of alumina increases when the strain rate increases, when the porosity of the sample decreases and when the volume of the sample decreases. S.E.M. examinations of the recovered fragments show that micro and macrocracks are transgranular. T.E.M. examinations show no microplasticity in each case.
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Submitted on : Tuesday, January 1, 1991 - 8:00:00 AM
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A. Cosculluela, J. Cagnoux, Francis Collombet. UNIAXIAL COMPRESSION OF ALUMINA : STRUCTURE, MICROSTRUCTURE AND STRAIN RATE. Journal de Physique IV Colloque, 1991, 01 (C3), pp.C3-109-C3-116. ⟨10.1051/jp4:1991314⟩. ⟨jpa-00249943⟩

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