Micromechanics of Failure in Cementitious Composites PDF Download
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Author: Victor C. Li
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Victor C. Li
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 74
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Book Description
Author: Yŏng-bae Cho
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 276
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Book Description
Author: P. K. Gotsis
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
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Book Description
Author: George J. Anastassopoulos
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: J.C. Maso
Publisher: CRC Press
ISBN: 1482271257
Category : Architecture
Languages : en
Pages : 332
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Book Description
This book presents a series of high level contributions from leading research groups around the world in the field of cement and concrete science. It deals with the rapidly advancing subject of the interfaces between the components of cementitious materials: cements, aggregates, fibres, reinforcement. It will be valuable for all those involved with
Author: Christian Huet
Publisher:
ISBN:
Category : Cement
Languages : en
Pages : 266
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Book Description
Author: Jacob Aboudi
Publisher: Butterworth-Heinemann
ISBN: 0123970350
Category : Technology & Engineering
Languages : en
Pages : 1032
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Book Description
Summary: A Generalized Multiscale Analysis Approach brings together comprehensive background information on the multiscale nature of the composite, constituent material behaviour, damage models and key techniques for multiscale modelling, as well as presenting the findings and methods, developed over a lifetime's research, of three leading experts in the field. The unified approach presented in the book for conducting multiscale analysis and design of conventional and smart composite materials is also applicable for structures with complete linear and nonlinear material behavior, with numerous applications provided to illustrate use. Modeling composite behaviour is a key challenge in research and industry; when done efficiently and reliably it can save money, decrease time to market with new innovations and prevent component failure.
Author: S.P. Shah
Publisher: Springer Science & Business Media
ISBN: 9401133883
Category : Science
Languages : en
Pages : 590
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Book Description
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.
Author: Dean Curtis Foster
Publisher:
ISBN: 9780549954064
Category : Composite materials
Languages : en
Pages : 511
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Book Description
The present work has identified two competing failure initiation mechanisms occurring in a unidirectional model composite system when loaded transverse to the direction of the fibers. Matrix cavitation and fiber-matrix debonding are the failure modes that have manifested themselves as a function of fiber spacing in multi-fiber cruciform specimens. The model composite system used two transparent epoxy systems, a linear room temperature cured 828/D-230 system and a nonlinear high temperature cured 862/W system, with five 0.36 mm diameter stainless steel wires as fibers. The fibers were arranged such that a single fiber was placed at the intersection of the face diagonals of four fibers located at the corners of a square. Seven different fiber spacing groups were tested ranging in volume fraction from 64% to 4%. Failure initiation was optically detected in-situ via the reflected light method using multiple high resolution, high magnification microscope video cameras. Three dimensional (3-D) finite element models (FEM) for all fiber spacing groups tested were used to analyze the stress state in the cruciform specimen at failure initiation. Residual stresses of both epoxy systems were measured by photoelasticity methods for incorporation into the micromechanical FEM. Analytical results of the individual cruciform 3-D FEMs in conjunction with the experimental observations were used to evaluate fiber-matrix debond and matrix failure criteria. A linear interaction debond criterion expressed as the sum of the ratios of the interfacial normal stress to tensile strength and interfacial shear stress to shear strength best validated the observed debond limits at the fiber spacing exhibiting fiber-matrix debonding as failure initiation. For the matrix failure criterion, analytical results indicated that the Mohr-Coulomb criterion validated the fiber spacing exhibiting cavitation. This work has developed failure criteria that correctly identified the two competing failure initiation modes that occurred as a result of the varying internal stress state as a function of fiber spacing. The criteria accurately predicted the observed debonding limits and matrix cavitation of both matrix systems. The detailed understanding and findings of this work will assist the materials engineer by increasing the fidelity of composite solutions to meet the increasing aerospace structural demands.
