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Role of Microstructure in Dynamic Fatigue of Glass-Ceramics After Contact with Spheres

Published

Author(s)

J G. Yeo, K -. Lee, Brian R. Lawn

Abstract

Dynamic fatigue data are reported for fine- and coarse-grain micaceous glass-ceramics after contact damage with spheres. Strengths of indented specimens are measured at stressing rates from 10-2 MPa.s-1 to 104 MPa.s-1 in water. Whereas strength degrades in the usual way with diminishing stressing rate in both materials, the degradation is substantially faster in the coarse-grain structure. The degradation rates are accelerated even further by multi-cycle contact loading. Failures occur from contact sites in all cases, but undergo a progressive transition in origin from classical cone crack to quasiplastic microcrack zone with increase in grain size and number of contact cycles. The results highlight the particularly deleterious effect of quasiplastic damage accumulation on lifetime.
Citation
Journal of the American Ceramic Society
Volume
83
Issue
No. 6

Keywords

cone crack, dynamic fatigue, glass-ceramics, Hertzian indentation, quasiplastic damage, spherical indenter

Citation

Yeo, J. , Lee, K. and Lawn, B. (2000), Role of Microstructure in Dynamic Fatigue of Glass-Ceramics After Contact with Spheres, Journal of the American Ceramic Society (Accessed March 3, 2024)
Created May 31, 2000, Updated October 12, 2021