By R. W. Davidge (auth.), R. C. Bradt, D. P. H. Hasselman, F. F. Lange (eds.)
These volumes represent the complaints of a Symposium ort the Fracture Mechanics of Cerarnics, held on the Pennsylvania country collage, college Park, Pennsylvania, July eleven, 12, and thirteen, 1973. The subject of the symposium focussed at the mechanical habit of brittle cerarnics when it comes to the features of cracks. The fifty two contributed papers via 87 authors, current an outline of the cur hire knowing of the idea and alertness of fracture mechan ics to brittle cerarnics. The prograrn chairmen gratefully recognize the monetary information for the Symposium supplied by means of the place of work of Naval Re seek, the varsity of Earth and Mineral Sciences of the Pennsyl vania nation collage, the fabrics study middle of Lehigh college, Bethlehem, Pennsylvana and Westinghouse study Laboratories, Pittsburgh, Pennsylvania. certain appreciation is prolonged to the specialist association supplied via the J. Orvis Keller convention heart of the Pennsyl vania country convention middle of the Pennsylvania country collage. specifically, Mrs. Patricia Ewing may be stated for the wonderful prograrn association and making plans. Dean Harold J. O'Brien, who used to be featured because the after-dinner speaker and who provided a such a lot stimulating speak at the cornrnunication among humans, additionally contrib uted to the luck of the assembly. eventually, we additionally desire to thank our joint secretaries for the endurance and assist in bringing those lawsuits to press. college Park R. C. Bradt Bethlehem D. P. H. Hasseiman Pittsburgh, Pennsylvania F. F. Lange July, 1973 v CONTENTS OF quantity 2 Contents of quantity 1 . . . . . . . . . . . . . . . . . . .
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Extra info for Fracture Mechanics of Ceramics: Volume 2 Microstructure, Materials, and Applications
R. W. Davidge, Proc. Brit. Ceram. 50C: 20 (1972) 364. R. W. Davidge, 5ei. Ceram. 6 (1973) in press. J. B. Wachtman, Proc. Int. Conf. Mech. Behaviour Mater. (Soe. Mater. Sei. Japan) 4 (1972) 432. A. G. Evans, C. Padgett and R. W. Davidge, J. Amer. Ceram. Soc. 56 (1973) 36. D. ~boav and T. G. Langdon, Metallography 1 (1969) 333. F. F. Lange, 'Fracture and Fatigue of Composites', Ed. L. J. Broutman and R. H. Crock, Academie Press, (1973) in press. D. Weyl, Ber. Deut. Keram. Ges. 36 (1959) 319. J. Selsing, J.
R. W. Rice, Proe. Brit. Ceram. 50e. 20 (1972) 3297 A. G. Evans and R. W. lMag. 20 (1969) 373. J. R. Perry and R. W. Davidge, Ceramurgica-;-in press (1973). A. G. Evans and R. W. Davidge, J. Nucl. Mater. 33 (1969) 249. L. A. Simpson, J. Amer. Ceram. 50e. 56 (1973) 7:A. G. Evans and G. Tappin, Proc. : Ceram. Soc. 20 (1972) 275. L. A. Simpson, J. Amer. Ceram. 50c. 56 (1973) in press. R. W. Davidge, Proc. Brit. Ceram. 50C: 20 (1972) 364. R. W. Davidge, 5ei. Ceram. 6 (1973) in press. J. B. Wachtman, Proc.
Cooper and Sillwood (43) showed that the mean crack spacing t i6 given by t (6) where r is the fibre radius andY the shear strength of the fibre/ matrix interface. Large fibre volume fractions and small fibre radii thus give small matrix crack spacings. Agreement between this analysis and experimental data for CRG is good (44). Depending on the value of t, the strength of the matrix may exceed its inherent strength. This is the case for the COO materials (large Vf' small r). The energy balance considerations for the generation of matrix cracks are limited to regions of specimen thickness t so tha t the strength of the matrix in the composi te is enhanced for small t (40).