These volumes, 3 and 4, of Fracture Mechanics of Ceramics con­ stitute the proceedings of an international symposium on the frac­ ture mechanics of ceramics held at the Pennsylvania State Univer­ sity, University Park, PA on July 27, 28, and 29, 1977. Volumes 1 and 2 were published previously as the proceedings of a sympo­ sium of the same name held July 11, 12, and 13, 1973, also at Penn State. All four volumes published to date concentrate on the fracture aspects of the mechanical behavior of brittle ceramics in terms of the characteristics of cracks. The program chairmen gratefully acknowledge the financial as­ sistance for the symposium provided by the Office of Naval Re­ search, the Energy Research and Development Administration, and the Army Research Office. Without their support the quality and mag­ nitude of this conference simply would not have been possible. Numerous individuals contributed to the success of the con­ ference, but unfortunately they cannot all be listed here. However the program chairmen would especially like to recognize the contri­ butions of Penn State Conference Coordinator, Mr. Ronald Avillion, whose expertise in planning and organization was indispensable; Dr. Fred R. Matson for his interesting after dinner speech; and Drs. A. M. Diness, J. C. Hurt, and D. W. Readey for their en­ couragement and valuable suggestions regarding the program. Finally, we wish to also thank our joint secretaries for the patience and help in bringing these proceedings to press.

Inhalt

of Volume 3.- Fundamentals of the Statistical Theory of Fracture.- A General Approach to the Statistical Analysis of Fracture.- Application of the Four Function Weibull Equation in the Design of Brittle Components.- Multiple Flaw Fracture Mechanics Model for Ceramics.- Analysis of Microvoids in Si3N4 Ceramics by Small Angle Neutron Scattering.- Crack Blunting in Sintered SiC.- Alteration of Flaw Sizes and KIc's of Si3N4 Ceramics by Molten Salt Exposure.- Weibull Parameters and the Strength of Long Glass Fibers.- Surface Flaws and the Mechanical Behavior of Glass Optical Fibers.- Mechanical Behavior of Optical Fibers.- Spin Testing of Ceramic Materials.- Effects of Specimen Size on Ceramic Strengths.- Indentation Fracture and Strength Degradation in Ceramics.- Indentation Induced Strength Degradation and Stress Corrosion of Tempered Glasses.- Compressive Microfracture and Indentation Damage in Al2O3.- Microcracking Associated with the Scratching of Brittle Solids.- Crack Formation During Scratching of Brittle Materials.- Impact Damage in Ceramics.- Particle Impact Regimes in Single Crystals.- A High-Speed Photographic Investigation of the Impact Damage in Soda-Lime and Borosilicate Glasses by Small Glass and Steel Spheres.- Localized Impact Damage in a Viscous Medium (Glass).- Erosion of Brittle Materials by Solid Particle Impact.- Compression Testing of Ceramics.- The Strength of Ceramics Under Biaxial Stresses.- A Fracture Specimen for High Temperature Testing.- Application of Fracture Mechanics to the Adherence of Thick Films and Braze Joints.- A Notched Ring Fracture Toughness Test for Ceramics.- Short Rod KIC Measurements of Al2O3.- Impact Fracture of Ceramics at High Temperature.- Contributors.