Abstract
In order to apply non-oxide ceramics to structural uses, such as gas turbine components and diesel engine components, greater understanding of their fracture behavior is needed. The fracture behavior under multiaxial stresses is important to component design because complicate stresses are established in real parts. Torsional, combined tensile/torsional and combined compressive/torsional tests were performed for the strength tests under tension/compression biaxial stresses. Ball-on-ring and ring-on-ring tests were performed for the strength tests under tension/tension biaxial stresses. Tested materials were two kinds of sintered silicon nitride and one kind of HIPed silicon carbide. The fracture strength was predicted using the multiaxial distribution function based on various proposed fracture criteria from the data of uniaxial strength. Moreover, the authors propose modified G-Criterion which is expressed as the equivalent stress \(Z = {\left( {{\sigma _n}^2 + {{\left( {\beta {\tau _n}} \right)}^2}} \right)^{1/2}}\). β indicates the degree of the influence of shear stress on a fracture. β value of each ceramic was determined by the strength data tested under tension/compression biaxial stresses. The predicted fracture strength was compared with experimental results under both tension/compression and tension/tension biaxial stresses. The fracture behavior of non-oxide ceramics under biaxial stresses was discussed.
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© 1992 Springer Science+Business Media New York
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Nakasuji, Y., Yamada, N., Tsuruta, H., Masuda, M., Matsui, M. (1992). Fracture Behavior of Non-Oxide Ceramics under Biaxial Stresses. In: Bradt, R.C., Hasselman, D.P.H., Munz, D., Sakai, M., Shevchenko, V.Y. (eds) Fracture Mechanics of Ceramics. Fracture Mechanics of Ceramics, vol 10. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3348-1_13
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DOI: https://doi.org/10.1007/978-1-4615-3348-1_13
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