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Brittle Matrix Composites 8

Brittle Matrix Composites 8 Book
Author : A. M. Brandt,V. C. Li,I. H. Marshall
Publisher : Woodhead Pub Limited
Release : 2006
ISBN : 9781845690311
Language : En, Es, Fr & De

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Book Description :

The subjects of the Symposia are on composite materials with matrices behaving as brittle in normal or special conditions. Brittle matrix composites are applied in various domains (civil engineering, mechanical equipment and machinery, vehicles, etc.) and in the last decades their importance is increasing together with their variety. papers include: aggregate-binder composites (concretes, fiber concretes, rocks); sintered materials (ceramics); high strength composites with brittle matrices. In principle, the general problems of structures made of composite materials are not included in the papers. Various approaches to the material engineering problems are presented in the papers. Among others: Design and optimization of the structure of materials; Theoretical considerations and computational methods; Models of materials and prediction of material properties; Test methods and new test results; Manufacturing processes; Applications of new materials and their behaviour in service; Durability assessments and environmental effects.

Brittle Matrix Composites 10

Brittle Matrix Composites 10 Book
Author : A M Brandt,M A Glinicki,J Olek,C K Y Leung
Publisher : Elsevier
Release : 2012-11-12
ISBN : 0857099892
Language : En, Es, Fr & De

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Book Description :

The subjects of the symposia are on composite materials behaving as brittle, normal and special conditions of exploitation. Brittle matrix composites are applied in various domains and the series of symposia are closely related to their applications in civil engineering. In the last decades their importance is increasing along with their variety and the use of most advanced methods of testing. Papers include concretes, fibre concretes and ceramics, particularly their composition, microstructure and fracture processes. Various new and advanced engineering problems are presented in the papers.

Brittle Matrix Composites 9

Brittle Matrix Composites 9 Book
Author : A M Brandt,J Olek,I H Marshall
Publisher : Elsevier
Release : 2009-11-30
ISBN : 085709307X
Language : En, Es, Fr & De

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Book Description :

The subjects of the symposia are on composite materials with matrices behaving as brittle in normal or special conditions. Brittle matrix composites are applied in various domains (civil engineering, mechanical equipment and machinery, vehicles, etc.) and in the last decades their importance is increasing together with their variety. Papers include: aggregate-binder composites (concretes, fibre concretes, rocks); sintered materials (ceramics); high strength composites with brittle matrices. In principle, the general problems of structures made of composite materials are not included in the papers. Various approaches to the material engineering problems are presented in the papers.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Tatiana V. Lyashenko,Svetlana A. Kryukovskaya
Publisher : Elsevier Inc. Chapters
Release : 2012-11-12
ISBN : 012809026X
Language : En, Es, Fr & De

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Book Description :

Fibre reinforced polymer-cement compositions for self-levelling flooring are studied. The individual and combined effects of dispersible polymer powder with properties of binder and superplasticiser, of various methylcelluloses, and of polypropylene fibre on effective viscosity of the mix and mechanical properties of the hardened mortar are evaluated and analysed. Used for analysis are multifactor experimental-statistical models built on the data obtained for 18 mixes (of the same workability) in the designed experiment and describing the fields of rheological model parameters, of strength, and other criteria in composition coordinates. The models have made it possible to simulate material behaviour in computational experiments, to reveal and evaluate the correlations of the properties for different technological conditions, to find individual and compromise optima.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Tomasz Ponikiewski,Jacek Gołaszewski
Publisher : Elsevier Inc. Chapters
Release : 2012-11-12
ISBN : 0128090278
Language : En, Es, Fr & De

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Book Description :

The paper presents results of tests on self-compacting mixtures with the addition of steel fibres (Steel Fibre Reinforced Self-Compacting Concrete). Four types of steel fibres at 3 levels of the volume ratio are considered. The results include studies on samples belonging to classes of slump flow SF, classes of viscosity T500, and rheological tests. The studies were based on application of two rheometers for rheological properties of concrete mixtures - BT2 Rheometer and Viskomat XL. Additionally, a study of compressive strength fcm,28 and flexural strength f was carried out on concrete SFRSCC. These studies have confirmed the possibility of using steel fibres in concrete SCC while maintaining the assumed technological parameters for concrete mixtures and, above all, their workability.

Brittle Matrix Composites 7

Brittle Matrix Composites 7 Book
Author : A M Brandt,V C Li,I H Marshall
Publisher : Elsevier
Release : 2003-10-01
ISBN : 085709310X
Language : En, Es, Fr & De

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Book Description :

The International Symposium in Brittle Matrix Composites October 13-15, 2003 covers a wide spectrum of topics including cement based composites, ceramic composites and brittle polymer matrix composites. In the papers various topics and issues are considered such as: analytical and numerical studies related to the design of composites, prediction of behaviour and verification of strength and stability, testing methods, manufacturing processes and repair, environmental effects and durability assessment. The present volume of 55 papers proves that there are still many problems in the field of brittle matrix composites deserving theoretical and experimental investigations and that new solutions to these problems are needed for practical application in civil engineering, industrial structures, machinery and other domains.

High Temperature Ceramic Matrix Composites 8

High Temperature Ceramic Matrix Composites 8 Book
Author : Litong Zhang,Dongliang Jiang
Publisher : John Wiley & Sons
Release : 2014-05-19
ISBN : 1118932986
Language : En, Es, Fr & De

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Book Description :

This proceedings contains 78 papers from the 8th International Conference on High Temperature Ceramic Matrix Composites, held September 22-26, 2013 in Xi'an, Shaanxi, China. Chapters include: Ceramic Genome, Computational Modeling, and Design Advanced Ceramic Fibers, Interfaces, and Interphases Nanocomposite Materials and Systems Polymer Derived Ceramics and Composites Fiber Reinforced Ceramic MatrixComposites Carbon-Carbon Composites: Materials, Systems, and Applications Ultra High Temperature Ceramics and MAX Phase Materials Thermal and Environmental Barrier Coatings

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Francisco Montero,Erik Schlangen
Publisher : Elsevier Inc. Chapters
Release : 2012-11-12
ISBN : 0128090154
Language : En, Es, Fr & De

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Book Description :

In this paper a model is presented to simulate fracture of fibre reinforced cement based materials. The model is based on a lattice-type fracture model. Fibres are explicitly implemented as separate elements connected to the cement matrix via special interface elements. With the model multiple cracking and ductile global behaviour are simulated of the composite material. Variables in the model are the fibre dimensions and properties, the fibre volume in the composite, the bond behaviour of fibres and matrix and the cement matrix properties. These properties are obtained by testing, which will be described in the paper. The model is used as a design tool for creating fibre cement based composites with any desired mechanical behaviour.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Huan He,Piet Stroeven,Eric Pirard,Luc Courard
Publisher : Elsevier Inc. Chapters
Release : 2012-11-12
ISBN : 0128090359
Language : En, Es, Fr & De

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Book Description :

Aggregate occupies at least three-quarters of the volume of concrete, so its impact on concrete’s properties is large. The sieve curve traditionally defines the aggregate size range. Another essential property is grain shape. Both, size and shape influence workability and the mechanical and durability properties of concrete. On the other hand, the shape of cement particles plays also an important role in the hydration process due to surface dissolution in the hardening process. Additionally, grain dispersion, shape and size govern the pore percolation process that is of crucial importance for concrete durability Discrete element modeling (DEM) is commonly employed for simulation of concrete structure. To be able doing so, the assessed grain shape should be implemented. The approaches for aggregate and cement structure simulation by a concurrent algorithm-based DEM system are discussed in this paper. Both aggregate and cement were experimentally analyzed by X-ray tomography method recently. The results provide a real experimental database, e.g. surface area versus volume distribution, for simulation of particles in concrete technology. Optimum solutions are obtained by different simplified shapes proposed for aggregate and cement, respectively. In this way, reliable concepts for aggregate structure and fresh cement paste can be simulated by a DEM system.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Agnieszka Ślosarczyk
Publisher : Elsevier Inc. Chapters
Release : 2012-11-12
ISBN : 0128090251
Language : En, Es, Fr & De

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Book Description :

Compared to concrete, the compressive strength is not a very important property of cement mortar. It is very important that mortar forms a complete, strong, and durable bond with the building material elements, because it is used as an adhesive and sealant material. The physical and mechanical properties of cement mortar, especially flexural strength, toughness, tensile strength, reduction of plastic as well as drying shrinkage, can be enhanced by the use of randomly dispersed fibres, such as steel, carbon or polymer. In the present research there were investigated cement mortars modified with randomly dispersed polypropylene and steel fibres in different volume fraction used both separately and in a hybrid system. The conducted research proved that the low modulus polypropylene fibres with good flexibility added to cement matrix resulted in good properties of fresh mortar and caused the reduction of early age cracking. The beneficial effects of flexible fibres could be attributed to their high aspect ratio and increased fibre availability at a given volume fraction due to their low density. Because of low stiffness, these fibres are particularly effective in controlling the propagation of micro-cracks. It was found that the hybrid combination of metallic and nonmetallic fibres can offer potential advantages in improving cement matrix properties, such as the ultimate strength and toughness of composites.

Damage Fracture and Fatigue of Ceramic Matrix Composites

Damage  Fracture  and Fatigue of Ceramic Matrix Composites Book
Author : Longbiao Li
Publisher : Springer
Release : 2018-08-27
ISBN : 9811317836
Language : En, Es, Fr & De

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Book Description :

This book focuses on the damage, fracture and fatigue of ceramic-matrix composites. It investigates tensile damage and fracture, fatigue hysteresis, and the properties of interfaces subjected to cyclic fatigue loading. Further, it predicts fatigue life at room and elevated temperatures using newly developed damage models and methods, and it analyzes and compares damage, fracture and fatigue behavior of different fiber performs: unidirectional, cross-ply, 2D and 2.5D woven. The developed models and methods can be used to predict the damage and lifetime of ceramic-matrix composites during applications on hot section components.Ceramic-matrix composites (CMCs) are high-temperature structural materials with the significant advantages of high specific strength, high specific modulus, high temperature resistance and good thermal stability, which play a crucial role in the development of high thrust weight ratio aero engines. The critical nature of the application of these advanced materials makes comprehensive characterization a necessity, and as such this book provides designers with essential information pertaining not only to the strength of the materials, but also to their fatigue and damage characteristics.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Waldemar Pichór,Maksymilian Frąc
Publisher : Elsevier Inc. Chapters
Release : 2012-11-12
ISBN : 0128090146
Language : En, Es, Fr & De

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Book Description :

The electric resistance and thermoelectric properties of cement composites with addition of expanded graphite were. The expanded graphite was obtained from intercalated graphite by rapid heating in different conditions. The influence of thermal treatment on thermoelectric properties was measured. The cement pastes were prepared in the two different ways, either by mixing together expanded graphite and cement, or by rubbing compounds together in order to obtain smaller particles of graphite (even nanometric size) during mixing. The bulk density and electric and thermoelectric properties of cement pastes with addition of expanded graphite were measured. The results of investigations show that the electric properties of composites are strongly influenced by the conditions of thermal expansion as well as by the technique of preparation.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Anonim
Publisher : Unknown
Release : 1994
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Brittle Matrix Composites book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Conrado de Souza Rodrigues,Mariana Arruda Pereira,Stefan Chaves Figueiredo,Khosrow Ghavami,Piet Stroeven
Publisher : Elsevier Inc. Chapters
Release : 2012-11-12
ISBN : 0128090464
Language : En, Es, Fr & De

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Book Description :

More recent investigations on cellulose-cement composites predominantly deal with durability aspects, whereby use is made of accelerated weathering cycles as the main approach to establishing the deterioration mechanisms and the efficiency of treatment methods. As moisture transport is the main mechanism that leads to the deterioration of those composites, accelerated ageing tests are commonly based on wet-drying cycles with a combination of temperature and relative humidity (R.H.) variations. Both variables result in dimensional changes of the samples, leading to interfacial abrasion and the progressive decrease in the composites’ toughness and strength. To investigate the effects of each of these variables, the weathering tests were performed in an environmental chamber considering each variable separately in two ageing cycles. In the first one the composites were submitted to saturation and drying at a constant 25°C, by means of a relative humidity change in the chamber. For the second ageing cycle a temperature variation between 20°C and 60°C at a constant R.H. of 50% was applied. The effects of each ageing cycle on the cellulose-cement composites were assessed on the basis of physical and mechanical parameters, determined after 0, 5, 20 and 50 cycles. Moreover, part of the samples was provided with electrical strain gauges, which rendered possible to determine the composites’ expansion-shrinkage behaviour during the temperature and R.H. variations. As the main treatment approach, the partial replacement of cement (OPC) by rice husk ash (RHA) was investigated. It was found that RHA improved the strength and durability performance of the composites, although the increased porosity resulted from the 30% replacement rate of OPC and carbonate filler by RHA.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Piotr Woyciechowski
Publisher : Elsevier Inc. Chapters
Release : 2012-11-12
ISBN : 0128090200
Language : En, Es, Fr & De

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Book Description :

The aim of the paper was to show the important aspect of treating waste additives as the main way to achieve sustainable development in the concrete technology. The author considers the effects of minimizing the use of cement replacing it with waste additives, on the concrete durability. The depth of carbonation is adopted as the possible measure of durability. Results of accelerated and natural tests of carbonation progress for concrete with normal and fluidal fly ash, silica fume and blast furnace slag are shown, influence on carbonation of the additive type, its content in concrete and its role (cement or aggregate substitution) is discussed. The important impact of early water curing on depth of carbonation is stated also.

The Processing and Mechanical Properties of High Temperature High Performance Composites Mechanism Based Constitutive Laws and Design

The Processing and Mechanical Properties of High Temperature  High Performance Composites  Mechanism Based Constitutive Laws and Design Book
Author : Anonim
Publisher : Unknown
Release : 1994
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

This document discusses the following: (1) Materials selection and innovation in design; (2) Elasto-plastic analysis of interface layers for fiber- reinforced metal-matrix composites; (3) Modeling of anisotropic behavior of weakly bonded fiber reinforced MMCs; (4) On the tensile properties of a fiber reinforced titanium matrix composite; (5) Control of strength anisotropy of metal matrix fiber composites; (6) inelastic strains due to matrix cracking in unidirectional fiber-reinforced composites; (7) Location and ultimate tensile strength of fiber-reinforced ceramic-matrix composites; (8) Matrix cracking and debonding of ceramic-matrix composites; (9) Matrix cracking of cross-ply ceramic composites; (10) Transverse cracking in fiber-reinforced brittle matrix, cross- ply laminates; (11) The mechanisms of deformation and failure in carbon matrix composites subject to tensile and shear loading; (12) Uncoupled and coupled approaches to predict crack-initiation in fiber-reinforced ceramic-matrix composites; (13) Stress corrosion cracking in a unidirectional ceramic-matrix composite; (14) Effects of gauge length on the tensile strength of SiC fibers; (15) Tunneling cracks in constrained layers; (16) The effect of interfacial properties on the flow strength of discontinuous reinforced metal matrix composites; (17) On dislocation storage and the mechanical response of fine scale microstructures; and (18) Effect of microstructural parameters on the yield strength of Al-4%Mg/Al2O3p composites.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Tomasz Zdeb,Izabela Hager,Jacek Śliwiński
Publisher : Elsevier Inc. Chapters
Release : 2012-11-12
ISBN : 0128090227
Language : En, Es, Fr & De

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Book Description :

This paper presents the results from an experimental study on the behaviour of Reactive Powder Concretes (RPC) at high temperature. The exposure to high temperature is related to the potential risk of fire. A previous study has shown that RPC is prone to spalling in such circumstances and for this reason polypropylene fibres were used in RPC concrete to prevent this occurring. The addition of PP fibres reduces the risk of spalling due to an increase in permeability, however it reduces the initial compressive strength of the RPC material by approx. 20 %. The results demonstrate that the strength of concrete along with the modulus of elasticity decrease with increasing temperature. Two experimental concretes were prepared and prismatic specimens, 40x40x80mm in size, were cast from each mixture and tested in compression after being submitted to the high temperature. The relative value of compressive strength course for both types of concrete shows a similar development. The change in modulus of elasticity with temperature was determined from the stress-strain relationship and compared with the dynamic modulus of elasticity determined with the use of a Pundit plus ultrasonic pulse velocity defectoscope.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Vaclav veselý,Petr Frantík,Tomáš Pail,Zbyněk keršner
Publisher : Elsevier Inc. Chapters
Release : 2012-11-12
ISBN : 012809043X
Language : En, Es, Fr & De

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Book Description :

The paper is focused on an estimation of the extent of the fracture process zone and the zone of cumulative damage evolving during tensile failure of structures made of quasi-brittle materials, e.g. cementitious composites. The zone is determined via a developed (semi-)analytical method based on a combination of multi-parameter linear elastic fracture mechanics, cohesive crack models and plasticity theory. Results of the method are verified by numerical simulations of three-point bending of notched beams using an academic computational code based on a discrete spring network (lattice-particle) model and programs based on continuum modelling (finite elements), both with implementation of the cohesive zone approach. Three materials differing in cohesive behaviour are considered in the study; apart from the classical quasi-brittle softening material also a quasi-ductile and a strain hardening ones are taken into account. Used simulation tools provide sound results, particularly in the case of the softening material. Moreover, significant potential of the developed modelling techniques is presented.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Tareq S. Al-Attar,Ahmed S. Ali,Bayan S. Al-Nu'man
Publisher : Elsevier Inc. Chapters
Release : 2012-11-12
ISBN : 0128090472
Language : En, Es, Fr & De

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Book Description :

Reactive powder concrete, RPC, demonstrates greatly ultra-high strength and improved durability characteristics compared with traditional or even high performance concrete. The main purpose of the present investigation is to modify RPC by adding styrene butadiene rubber, SBR, as a polymer in percentages 6, 12, 14, and 18 by weight of cement to the original mixture. An experimental work had carried out to investigate the behavior and durability of the polymer modified reactive powder concrete, PMRPC, exposed to two types of oil products (gas oil and kerosene) in comparison with the original RPC. Metakaolin was used as a pozzolanic material. Teasing program was designed to include compression, initial surface absorption, total absorption, and permeability tests. The test period was extended to 180 days. Moreover, drying shrinkage strain was measured up to the age of 90 days. Tested specimens were grouped in three series after the age of 28 days. The first continued to be cured with water, meanwhile, the second cured with gas oil and the third with kerosene. The experimental results showed that, the PMRPC mixes exhibited superior performance in all tested properties than the original RPC, especially when exposed to oil products. This behavior could be related to the role of the polymer in filling the pores and cracks and thus improving the surface condition. It was concluded that the optimum percentage of added SBR was 14%. In addition, it was found experimentally that SBR could totally replace the highrange water reducing admixture in PMRPC. Finally, the main conclusion reached was that PMRPC could be used to construct durable oil storage tanks or at least be used as lining layers for storage tanks.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Alessandro P. Fantilli,Bernardino Chiaia,Samanta Corrado
Publisher : Elsevier Inc. Chapters
Release : 2012-11-12
ISBN : 0128090375
Language : En, Es, Fr & De

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Book Description :

A new eco-mechanical index (EMI) has been introduced with the aim of quantifying the environmental impact of concrete structures. From a general point of view, this indicator represents the amount of carbon dioxide released to produce certain mixtures of pre-established strength and ductility. Both for normal strength and high strength concrete, with and without steel fibers, these mechanical properties are summarised by the work of fracture under tensile actions. If also structural durability has to be taken into account, the maximum crack width of reinforced concrete structures must be computed. This is possible by using a tension-stiffening model, here applied to reinforced concrete elements in tension. However, with or without the evaluation of crack width, the concrete with the best EMI releases the highest fracture energy. For this reason, the work of fracture represents also a durability parameter, and therefore it can be used to tailor cement-based composites with the highest strength, ductility, and durability, and the lowest environmental impact.