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 contributedto 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.
Table of Contentsof Volume 4.- Lattice Theories of Fracture.- Mechanisms of Subcritical Crack Growth in Glass.- Stress Corrosion Mechanisms in E- Glass Fiber.- A Multibarrier Rate Process Approach to Subcritical Crack Growth.- Stress Rupture Evaluations of High Temperature Structural Materials.- Growth of Cracks Partly Filled with Water.- Electrolytic Degradation of Lithia-Stabilized Polycrystalline ??- Alumina.- Engineering Design and Fatigue Failure of Brittle Materials.- Subcritical Crack Growth in PZT.- Subcritical Crack Growth in Electrical Porcelains.- Fracture Mechanics of Alumina in a Simulated Biological Environment.- Modified Double Torsion Method for Measuring Crack Velocity in NC-132 (Si3N4).- Subcritical Crack Growth in Glass Ceramics.- Dynamic Fatigue of Foamed Glass.- Static Fatigue Behavior in Chemically Strengthened Glass.- Prediction of the Self-Fatigue of Surface Compression Strengthened Glass Plates.- Fracture Mechanics and Microstructural Design.- Microcracking in a Process Zone and Its Relation to Continuum Fracture Mechanics.- A Structure Sensitive KIc-Value and Its Dependence on Grain Size Distribution, Density, and Microcrack Formation.- Microstructural Dependence of Fracture Mechanics Parameters in Ceramics.- Role of Stress Induced Phase Transformation in Enhancing Strength and Toughness of Zirconia Ceramics.- Toughness and Fractography of TiC and WC.- Mechanical Properties of Al2O3-HfO2 Eutectic Microstructures.- Fracture Resistance and Temperatures in Metal Infiltrated Porous Ceramics.- Reaction Sintered Si3N4: Development of Mechanical Properties Relative to Microstructure and the Nitriding Environment.- Mechanical Properties of Porous PNZT Polycrystalline Ceramics.- Fracture of Brittle Particulate Composites.- Some Effects of Dispersed Phases on the Fracture Behavior of Glass.- Fracture Toughness of Reinforced Glasses.- Contributors.