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Fracture Micromechanics Of Continuous Fiber And Textile Reinforced Metal And Ceramic Matrix Composites
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Book Synopsis Fracture Micromechanics of Continuous Fiber and Textile Reinforced Metal and Ceramic Matrix Composites by :
Download or read book Fracture Micromechanics of Continuous Fiber and Textile Reinforced Metal and Ceramic Matrix Composites written by and published by . This book was released on 1994 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes progress on fatigue crack growth through unidirectional SCS-6/titanium alloy composites and the fatigue and fracture of ceramic matrix composites reinforced with continuous fibers, both large and small, in unidirectional and woven forms. The fiber/matrix interaction is detailed for SCS-6/titanium alloy composites near stress concentrations, and it is shown how that is similar to measurements of fiber stress in the wake of fatigue cracks. The main theme of the work on ceramic matrix composites is the effect of fiber architecture on fatigue behavior. Metal matrix composites, Ceramic matrix composites, Continuous fiber reinforcement, Fatigue crack growth, Crack growth mechanisms, Woven fiber reinforcement.
Book Synopsis Fracture Micromechanics as Influenced by Environment in Textile Reinforced Ceramic Matrix Composites by :
Download or read book Fracture Micromechanics as Influenced by Environment in Textile Reinforced Ceramic Matrix Composites written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this research was a basic understanding of the factors that contribute to the fracture toughness of fabric reinforced ceramic matrix composites (CMCs). A technique was developed for measuring the fracture toughness of fabrics. The mechanical properties of matrix materials were measured using a Nanoindenter, and found to be low compared to the properties expected from matrix composition. Crack tip micromechanics, i.e., crack opening displacements and strains near the crack tip, were measured both for fabrics and from CMCs. It was found that fiber bundles move relative to each other during fracture, and that voids in the material accommodate that motion. The ability of fiber bundles to move is believed to be an important factor in developing a high fracture toughness in these materials. A finite element model was developed to simulate fabric fracture and the effects of an including matrix to form a composite. Exposure to air and Argon at 1100 deg C for 146 hrs. resulted in a decrease in fracture toughness of several composites evaluated. Micromechanics evaluation found no differences that could be attributed to the gas environment, so it was concluded that fiber strength degradation was the cause of lower fracture toughness.
Book Synopsis Fracture Micromechanics of Intermetallic and Ceramic Matrix Continuous Fiber Composites by :
Download or read book Fracture Micromechanics of Intermetallic and Ceramic Matrix Continuous Fiber Composites written by and published by . This book was released on 1991 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Micromechanics parameters for fatigue cracks growing perpendicular to fibers were measured through small port holes in the matrix made by electropolishing, were used to determine fiber stresses, which ranged from 1.1 to 4 GPa. Crack opening displacements at maximum load and residual crack opening displacements (at minimum load) were measured. Matrix was removed along the crack flanks after completion of the tests to reveal the extent and nature of fiber damage. Analyses were made of these parameters, and it was found possible to link the extent of fiber debonding to residual COD and the shear stress for debonding, estimated at 245 MPa, to COD. Measured experimental parameters were used to compute crack growth rates using a wall known fracture mechanics model for fiber bridging tailored to these experiments. The potential for microstructural manipulation to yield further increases in fatigue crack growth resistance for the metals and alloys currently being used in gas turbine construction is small. Studies of fatigue crack growth through aluminum, titanium and superalloys have shown that there are many similarities in the mechanisms of crack growth and the crack tip micromechanics for these materials. Conversely, composite materials reinforced with continuous strong fibers offer the promise of drastic increases in fatigue crack growth resistance.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Time-Dependent Mechanical Behavior of Ceramic-Matrix Composites at Elevated Temperatures by : Longbiao Li
Download or read book Time-Dependent Mechanical Behavior of Ceramic-Matrix Composites at Elevated Temperatures written by Longbiao Li and published by Springer Nature. This book was released on 2020-04-18 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book investigates the time-dependent behavior of fiber-reinforced ceramic-matrix composites (CMCs) at elevated temperatures. The author combines the time-dependent damage mechanisms of interface and fiber oxidation and fracture with the micromechanical approach to establish the relationships between the first matrix cracking stress, matrix multiple cracking evolution, tensile strength, tensile stress-strain curves and tensile fatigue of fiber-reinforced CMCs and time. Then, using damage models of energy balance, the fracture mechanics approach, critical matrix strain energy criterion, Global Load Sharing criterion, and hysteresis loops he determines the first matrix cracking stress, interface debonded length, matrix cracking density, fibers failure probability, tensile strength, tensile stress-strain curves and fatigue hysteresis loops. Lastly, he predicts the time-dependent mechanical behavior of different fiber-reinforced CMCs, i.e., C/SiC and SiC/SiC, using the developed approaches, in order to reduce the failure risk during the operation of aero engines. The book is intended for undergraduate and graduate students who are interested in the mechanical behavior of CMCs, researchers investigating the damage evolution of CMCs at elevated temperatures, and designers responsible for hot-section CMC components in aero engines.
Book Synopsis Micromechanics of Ceramic-Matrix Composites at Elevated Temperatures by : Longbiao Li
Download or read book Micromechanics of Ceramic-Matrix Composites at Elevated Temperatures written by Longbiao Li and published by Springer Nature. This book was released on with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Inelasticity and Micromechanics of Metal Matrix Composites by : George Voyiadjis
Download or read book Inelasticity and Micromechanics of Metal Matrix Composites written by George Voyiadjis and published by Elsevier. This book was released on 2017-05-04 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains fifteen papers based on the presentations made at the symposium on "Inelasticity and Micromechanics of Metal Matrix Composites" held at the University of Washington, USA, in mid-1994. The papers represent the most recent work conducted on inelasticity and micromechanics of metal matrix composites. The book is divided into two parts: Part I deals with the study of inelastic deformation in metal matrix composites, while Part II tackles the micromechanical aspects of metal matrix composites. The articles discuss different aspects of these two topics ranging from purely theoretical treatments to extensive experimental investigations. Many of the papers are by prominent researchers working in this area.
Book Synopsis Fracture and Fatigue by : Lawrence J. Broutman
Download or read book Fracture and Fatigue written by Lawrence J. Broutman and published by Elsevier. This book was released on 2016-06-15 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite Materials, Volume 5: Fracture and Fatigue covers the concepts, theories, and experiments on fracture and fatigue behavior of composite materials. The book discusses the fracture of particulate composites, including metal, polymer, and ceramic matrices; relates micromechanics effects to composite strength; and summarizes the various theories relating constituent properties and microstructure to fracture. The text also describes differing theories regarding the strength and fracture of composites; and the theory and experiment relating to time-dependent fracture covering both long-term as well as dynamic fracture. The fatigue of both polymer- and metal-matrix composites and the factors influencing the toughness of both brittle and ductile matrix composites are also considered. Design engineers, materials scientist, materials engineers, and metallurgists will find the book useful.
Book Synopsis Micromechanical Damage Models for Continuous Fiber Reinforced Composite Materials by : Yi Wu
Download or read book Micromechanical Damage Models for Continuous Fiber Reinforced Composite Materials written by Yi Wu and published by . This book was released on 2013 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary objective of this research work is to investigate the effective mechanical responses of continuous fiber reinforced composites by modifying and extending the available micromechanical framework. A major part of the work conducted involves the investigation of the effective damage responses due to damage evolutions of matrix microcracks and fiber breakages. Chapter 3 presents the effective elastic damage behavior of continuous fiber reinforced composites with evolutionary matrix microcracks. A cohesive penny-shape microcrack model is proposed within a two-step homogenization framework to achieve the effective elastic damage behavior of continuous fiber reinforced composites. In the proposed model, the size and the number density of microcracks are defined as two damage parameters to control the matrix microcrack evolution. In addition, the thermal effect is taken into account by taking advantage of the thermal eigenstrain and the Eshelby's equivalent inclusion principle. The overall coefficient of thermal expansion (CTE) of the composite is systematically derived under the framework of micromechanics to describe the overall damage behavior of composites due to matrix microcrack evolution under temperature changes. Chapter 4 proposes a micromechanical evolutionary damage framework capable of predicting the overall mechanical behavior of and damage evolution in continuous fiber reinforced composites. In the framework, the effective stress fields in a single fiber due to an embedded penny-shaped fiber breakage are systematically derived by applying the double-inclusion theory. The notion of effective length denoting the distance between two adjacent breakages is introduced as a damage parameter while determining the damage evolution within a single fiber. This enables the modeling of the effective damage behavior of a single-fiber reinforced composite. As an application of the proposed framework, a micromechanical damage model is further proposed to simulate the fiber-dominated failure mechanism within a multi-fiber composite. A Weibull probability function is adopted to estimate the varying volume fractions of damaged fibers and intact fibers. Numerical simulations are presented to demonstrate the effectiveness of the proposed methodology. In Chapter 5, based on the linear elastic fracture mechanics (LEFM) and ensemble-volume averaging technique, an effective eigenstrain is newly proposed to quantify the homogenized stress fields in a single fiber due to multiple fiber breakages. In the proposed model, the number density evolution of fiber breakages is characterized by a two-parameter Weibull statistic with the temperature effect implicitly enclosed by properly adjusting the Weibull parameters. The damage criterion in the evolutionary damage model is theoretically derived. Utilization of the proposed damage framework, a homogeneous damage evolution model capable of simulating the material behavior of multi-fiber reinforced composite materials is developed. Chapter 6 presents two stochastic risk-competing models to simulate the fiber breakage evolution in a multi-fiber composite with an inhomogeneous fashion by considering different load sharing mechanisms. A unit cell model is adopted with each cell being assigned an initial weakness based on a normal distribution. Damage evolution inside each cell structure follows the micromechanical model presented in Chapter 5. Two risk-competing models are introduced subsequently to determine the damage sequence within the multi-fiber composite by computing the fracture probability based on the weakness of cells at each time step. It is observed that one risk-competing model tends to generate a concentrated damage pattern with broken fibers clustering in a T-shape or a cross-shape, while the other model yields a more diffused damage pattern. Finally, the overall stress-strain responses and the fiber breakage evolution are predicted and verified against experimental data. Chapter 7 examines the effective elastoplastic behavior of metal matrix composites (MMCs) containing unidirectionally aligned continuous fibers. A homogenization procedure is utilized to derive the overall yield function for the composite based on the probabilistic spatial distribution of aligned inclusions. Based on continuum plasticity, a plastic flow rule and a hardening law are postulated. These laws together with the proposed overall yield function then characterized the macroscopic elastoplastic behavior of the composite under three-dimensional arbitrary loading/unloading histories. The overall uniaxial elastoplastic stress-strain behavior of MMCs with aligned continuous fibers is investigated. Comparisons between theoretical predictions and experimental data for the composite are performed to illustrate the capability of the proposed method. Chapter 8 concludes the present research on micromechanics and effective elastic and elastoplastic behavior of continuous fiber reinforced MMCs. Finally, related future research topics are discussed briefly.
Book Synopsis The Processing and Mechanical Properties of High Temperature/ High Performance Composites. Fatigue and Creep by :
Download or read book The Processing and Mechanical Properties of High Temperature/ High Performance Composites. Fatigue and Creep written by and published by . This book was released on 1994 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document includes the following topics; (1) Mode I fatigue cracking in a fiber reinforced metal matrix composite; (2) Interfacial crack growth in fiber-reinforced metal-matrix composites; (3) Fatigue crack growth in fiber-reinforced metal-matrix composites; (4) Thermomechanical fatigue cracking in fiber reinforced metal matrix composites; (5) Transverse and cyclic thermal loading of the fiber reinforced metal-matrix composite SCS6/Ti-15-3; (6) Fatigue of ceramic matrix composite; (7) Ductile-reinforcement toughening in gamma gamma/TiAl intermetallic-matrix composites; effects on fracture toughness and fatigue-crack propagation resistance; (8) Creep models for metal matrix composites with long brittle fibers; (9) Models for the creep of ceramic matrix composite materials; (10) Power law creep of ceramic matrix composite materials; (10) Power law creep with interface slip and diffusion in a composite material; (11) Steady state creep of fiber-reinforced composites: Constitutive equations and computational issues; (12) The creep anisotropy of a continuous-fiber- reinforced SiC/CAS composite; (13) Power law creep of a composite material containing discontinuous rigid aligned fibers; and (14) Diffusive void bifurcation in stressed solid.
Book Synopsis Damage and Fracture of Ceramic-Matrix Composites Under Stochastic Loading by : Longbiao Li
Download or read book Damage and Fracture of Ceramic-Matrix Composites Under Stochastic Loading written by Longbiao Li and published by Springer Nature. This book was released on 2021-06-08 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the relationships between tensile damage and fracture, fatigue hysteresis loops, stress-rupture, fatigue life and fatigue limit stress, and stochastic loading stress. Ceramic-matrix composites (CMCs) possess low material density (i.e., only 1/4 - 1/3 of high-temperature alloy) and high-temperature resistance, which can reduce cooling air and improve structure efficiency. Understanding the failure mechanisms and internal damage evolution represents an important step to ensure reliability and safety of CMCs. This book investigates damage and fracture of fiber-reinforced ceramic-matrix composites (CMCs) subjected to stochastic loading, including: (1) tensile damage and fracture of fiber-reinforced CMCs subjected to stochastic loading; (2) fatigue hysteresis loops of fiber-reinforced CMCs subjected to stochastic loading; (3) stress rupture of fiber-reinforced CMCs with stochastic loading at intermediate temperature; (4) fatigue life prediction of fiber-reinforced CMCs subjected to stochastic overloading stress at elevated temperature; and (5) fatigue limit stress prediction of fiber-reinforced CMCs with stochastic loading. This book helps the material scientists and engineering designers to understand and master the damage and fracture of ceramic-matrix composites under stochastic loading.
Book Synopsis Micromechanics Analysis of Space Simulated Thermal Deformations and Stresses in Continuous Fiber Reinforced Composites by : David Earl Bowles
Download or read book Micromechanics Analysis of Space Simulated Thermal Deformations and Stresses in Continuous Fiber Reinforced Composites written by David Earl Bowles and published by . This book was released on 1990 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Micromechanisms of Fatigue Crack Growth and Fracture Toughness in Metal Matrix Composites by :
Download or read book Micromechanisms of Fatigue Crack Growth and Fracture Toughness in Metal Matrix Composites written by and published by . This book was released on 1993 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: This final report summarizes research in the fatigue and fracture toughness of a large number of materials ranging from metallic and ceramic matric composites reinforced with ceramic particulates to aluminum, titanium and glass matrix composites reinforced with continuous fibers. The purpose of this report is to summarize and draw conclusions about the state of knowledge of fatigue and fracture mechanisms from the past several years of research sponsored mainly by ONR.
Book Synopsis A Study of Localised Fracture Events in Continuous Fibre Reinforced Ceramic Matrix Composites by : Kevin Leslie Powell
Download or read book A Study of Localised Fracture Events in Continuous Fibre Reinforced Ceramic Matrix Composites written by Kevin Leslie Powell and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Towards the Development of Micromechanics Equations for Ceramic Matrix Composites Via Fiber Substructuring by :
Download or read book Towards the Development of Micromechanics Equations for Ceramic Matrix Composites Via Fiber Substructuring written by and published by . This book was released on 1992 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1988 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Micromechanics of Deformation and Failure in Metal-Matrix Composites by :
Download or read book The Micromechanics of Deformation and Failure in Metal-Matrix Composites written by and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metals reinforced with ceramic fibers or particulates are promising materials for use in new generations of aerospace structures, propulsion devices and energy conversion systems. Furthermore, the controllability of many of these variables opens up the possibility of engineering materials for specific applications, if the effects of alterations in microstructure can be predicted. However, metal-matrix composites often have low ductility and low fracture toughness. An improved understanding of the basic deformation and failure mechanisms is needed to overcome these problems. To this end, research was carried out in three areas: (1) continuum modeling of deformation and fracture in metal-matrix composites, including the interaction between failure mechanisms using phenomenological constitutive relations to characterize each of the main failure modes in metal-matrix composites, reinforcement cracking, interfacial debonding and matrix void nucleation, growth and coalescence; (2) numerical studies of the propagation of fast cracks along and across interfaces, with a particular focus on understanding crack propagation from a brittle phase into a ductile phase; and (3) discrete dislocation modeling of matrix plastic deformation in metal-matrix composites with micron size reinforcements.
