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Download Concepts, Flaws, and Fractography by F. F. Lange (auth.), R. C. Bradt, D. P. H. Hasselman, F. F. PDF

By F. F. Lange (auth.), R. C. Bradt, D. P. H. Hasselman, F. F. Lange (eds.)

These volumes represent the complaints of a Symposium at the Fracture Mechanics of Ceramics, held on the Pennsylvania country college, collage Park, Pennsylvania, July eleven, 12, and thirteen, 1973. The topic of the symposium focussed at the mechanical habit of brittle ceramics when it comes to the features of cracks. The fifty two contributed papers by means of 87 authors, current an outline of the cur­ lease realizing of the speculation and alertness of fracture mechan­ ics to brittle ceramics. this system chairmen gratefully recognize the monetary counsel for the Symposium supplied via the workplace of Naval Re­ seek, the school of Earth and Mineral Sciences of the Pennsyl­ vania nation college, the fabrics examine heart of Lehigh college, Bethlehem, Pennsylvana and Westinghouse examine Laboratories, Pittsburgh, Pennsylvania. detailed appreciation is prolonged to the professional association supplied through the J. Orvis Keller convention heart of the Pennsyl­ vania nation convention middle of the Pennsylvania nation collage. specifically, Mrs. Patricia Ewing may be said for the wonderful software association and making plans. Dean Harold J. O'Brien, who used to be featured because the after-dinner speaker and who offered a so much stimulating speak at the communique 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. collage Park R. C. Bradt Bethlehem D. P. H. Hasselman Pittsburgh, Pennsylvania F. F. Lange July, 1973 v CONTENTS OF quantity 1 Contents of quantity 2 . . . . . . . . . . . . . . . . . . .

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3. FRACTURE MECHANICS MEASUREMENTS Vast experience in fracture mechanics measurements has been accumulated for metal systems in recent years. This fund of information must clearly be applied to the development of techniques suitable for ceramic materials. It should not be regarded as a constraint, however, because fracture mechanics measurements in ceramic materials embrace certain unique problems. There is a wide range of specimen geometries available for fracture mechanics measurements. The specimen selected should be determined, in part, by the type of measurement required.

A. G. EVANS 32 stress intensity measurements during crack arrest, after rapid propagation, have not been evaluated for ceramic materials, despite the importance of this parameter. B. specimen. 4 Discussion of Techniques A cursory examination of Table I shows that the two specimens with the most versatility are the bend specimen and the double torsion specimen. It is unfortunate that some ditficu1ties are currently associated with the evaluation of fracture mechanics parameters for both specimens.

Then, due to the additional compressive loading constraint, the double torsion specimen becomes the only feasible alternative. 3 Stress Intensity Factors During Crack Arrest There are several structural ceramic applications of substantial commercial importance where crack arrest conditions are more critical than the conditions for initial propagation. 27 These are applications where the loading is primarily compressive and structural integrity is more important than strength. A good example is the refractory application.

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