Workshop Proceedings: Toughening Mechanisms in Quasi-Brittle Materials Held on 16-20 July 1990 in Evanston, Illinois
Workshop Proceedings: Toughening Mechanisms in Quasi-Brittle Materials Held on 16-20 July 1990 in Evanston, Illinois

Author:

Publisher:

Published: 1991

Total Pages: 590

ISBN-13:

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Recently, considerable interest has been developing in understanding and modeling the fracture processes in these quasi-brittle materials as well as in designing materials with improved toughness. The research activities in these groups of materials: ceramics, cement and rock can be substantially enhanced with the exchange of information between these three groups of investigators. Since the field is relatively new, it is likely that the researchers working with one set of materials are not aware of similar developments with other set of materials. Although each material has its own set of specific characteristics, many common aspects can be shared among these quasi-brittle materials. These include: (1) application of nonlinear fracture mechanics, (2) experimental and theoretical considerations of strain localization, (3) microscopic observation of fracture process zone, (4) nondestructive evaluation of damage, (5) models to relate microstructure with macroscopic response, and (6) development of experimental and theoretical tools. The purpose of this workshop was to bring together researchers addressing the problem of fracture in cement, ceramics, and rock so that they can share their knowledge and develop a more general syntheses of the problem.

Toughening Mechanisms in Quasi-Brittle Materials
Toughening Mechanisms in Quasi-Brittle Materials

Author: S.P. Shah

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 590

ISBN-13: 9401133883

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A variety of ceramic materials has been recently shown to exhibit nonlinear stress strain behavior. These materials include transformation-toughened zirconia which undergoes a stress-induced crystallographic transformation in the vicinity of a propagating crack, microcracking ceramics, and ceramic-fiber reinforced ceramic matrices. Since many of these materials are under consideration for structural applications, understanding fracture in these quasi-brittle materials is essential. Portland cement concrete is a relatively brittle material. As a result mechanical behavior of concrete, conventionally reinforced concrete, prestressed concrete and fiber reinforced concrete is critically influenced by crack propagation. Crack propagation in concrete is characterized by a fracture process zone, microcracking, and aggregate bridging. Such phenomena give concrete toughening mechanisms, and as a result, the macroscopic response of concrete can be characterized as that of a quasi-brittle material. To design super high performance cement composites, it is essential to understand the complex fracture processes in concrete. A wide range of concern in design involves fracture in rock masses and rock structures. For example, prediction of the extension or initiation of fracture is important in: 1) the design of caverns (such as underground nuclear waste isolation) subjected to earthquake shaking or explosions, 2) the production of geothermal and petroleum energy, and 3) predicting and monitoring earthquakes. Depending upon the grain size and mineralogical composition, rock may also exhibit characteristics of quasi-brittle materials.

NATO Advanced Research Workshop. Toughening Mechanisms in Quasi-Brittle Materials, Held in Evanston, Illinois on July 16-20, 1990
NATO Advanced Research Workshop. Toughening Mechanisms in Quasi-Brittle Materials, Held in Evanston, Illinois on July 16-20, 1990

Author: Surendra P. Shah

Publisher:

Published: 1990

Total Pages: 624

ISBN-13:

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This workshop brought together researchers addressing the problem of fracture in cement, ceramics, and rock so that they could share their knowledge and develop a more general syntheses of the problem. This preprint volume contains contributions from lectures for each of the 9 sessions. The final proceedings of this workshop will be published in a hardcover book by Kluewer Academic Publishers (NATO ASI Series). This book will contain 36 chapters; the finalized contributions of 27 lectures and 9 reporters. Keywords: Quasi brittle materials, Toughening mechanisms in materials, Workshop, Cement fracture, Ceramic fracture, Rock fracture. (js).