论文信息 - J‐Integral Measurements of the Fracture of 50% Alumina Refractories

J‐Integral Measurements of the Fracture of 50% Alumina Refractories

The J-integral experimental technique was used to study fracture initiation in burned refractory bricks and refractory casta-bles of the 50% alumina variety. In a comparison of JIc and GIc, and 2ywof it is consistently observed that GIc<JIc<2ryWof. The quantities (JIc-GIc) or (JIC/GIC), as well as (2ywof/GIc), can be applied to estimate the inelastic energy contribution to the crack-tip process zone of these refractories. The latter two parameters distinctly classify the burned bricks and the casta-bles into different fracture characteristics. As such, these parameters are potentially very useful in the microstruetural design of refractories.

[1] Junn Nakayama,et al. Direct Measurement of Fracture Energies of Brittle Heterogeneous Materials , 1965 .

[2] H. Tattersall,et al. The work of fracture and its measurement in metals, ceramics and other materials , 1966 .

[3] J. Rice. A path-independent integral and the approximate analysis of strain , 1968 .

[4] Sidney Mindess,et al. The J-integral as a fracture criterion for fiber reinforced concrete , 1977 .

[5] John R. Rice,et al. Some further results of J-integral analysis and estimates. , 1973 .

[6] R. Davidge,et al. The effective surface energy of brittle materials , 1968 .

[7] D. Hasselman,et al. Fracture Toughness and Spalling Behavior of High‐Al2O3 Refractories , 1974 .

[8] K. K. Strelov,et al. The significance of non-elastic deformation in the fracture of heterogeneous ceramic materials , 1978 .

[9] D. Hasselman,et al. Unified Theory of Thermal Shock Fracture Initiation and Crack Propagation in Brittle Ceramics , 1969 .