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.

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.

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:

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:

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.

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.

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.

Download or read book High Temperature Mechanical Behaviour of Ceramic Composites written by Shanti Nair and published by Butterworth-Heinemann. This book was released on 1995-05-15 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction; Interfaces; Residual stresses; Fibre properties; Matrix cracking in unidirectional materials; Matrix cracking in 2-D materials; Stress redistribution; Fatigue, creep, challenges and opportunities.

Download or read book 15th Annual Conference on Composites and Advanced Ceramic Materials Part 1 of 2 Volume 12 Issue 7 8 written by John B. Wachtman and published by John Wiley & Sons. This book was released on 2009-09-28 with total page 682 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is part of the Ceramic Engineering and Science Proceeding (CESP) series. This series contains a collection of papers dealing with issues in both traditional ceramics (i.e., glass, whitewares, refractories, and porcelain enamel) and advanced ceramics. Topics covered in the area of advanced ceramic include bioceramics, nanomaterials, composites, solid oxide fuel cells, mechanical properties and structural design, advanced ceramic coatings, ceramic armor, porous ceramics, and more.

Download or read book Government Reports Annual Index written by and published by . This book was released on 1991 with total page 1646 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.

Download or read book Oxide Based Fiber Reinforced Ceramic Matrix Composites written by Bilge Saruhan and published by Springer Science & Business Media. This book was released on 2003-01-31 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of Oxide-Based Fiber-Reinforced Ceramic-Matrix Composites is to provide comprehensive information on the most recent successful findings. The book consists of six chapters which characterize the current state of the art concerning oxide-based fiber-reinforced composites. Chapter one provides an introduction, examples of application areas and background information. Chapter two deals with the primary material properties for the areas of application and lists the possible constituent parts of the composites, depending on particular demands. Chapter three explains both the past and present fabrication methods which can affect the performance of the composites. Chapter four defines the interphase-related phenomena and describes the mechanical characteristics of the oxide-based fiber-reinforced composite, produced with different interphases. Chapter five deals with the fabrication route, functionality and mechanical characterization of the porous-matrix composites. The last chapter summarizes the present achievements and identifies requirements for reaching the goal, thereby providing a promising course for future research.

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.

Download or read book Ceramic Matrix Composites written by Longbiao Li and published by Elsevier. This book was released on 2023-06-30 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ceramic Matrix Composites: Lifetime and Strength Prediction Under Static and Stochastic Loading focuses on the strain response and lifetime prediction of fiber-reinforced ceramic-matrix composites under stress-rupture loading at intermediate temperatures. Typical damage mechanisms of matrix cracking, interface debonding and oxidation, and fiber’s oxidation and fracture are considered in the micromechanical analysis. Effects of composite’s constituent properties, peak stress, and testing temperature on the composite’s strain response and lifetime are also analyzed in detail. Finally, a comparison of constant and different stochastic stress spectrum on composite’s damage evolution and fracture is discussed. This book will be a practical guide for the material researcher and component designer needing to better understand the composite’s damage and fracture behavior under stress-rupture loading at intermediate temperatures. Contains detailed analysis of the stress-rupture behavior of fiber-reinforced ceramic-matrix composites Includes experimental data on stress-rupture behavior of different CMCs Presents micromechanical constituent models for characterizing damage and fracture behavior under stress-rupture loading Provides data on the physical properties of each constituent at various temperatures, along with the composite’s response

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.

Download or read book Textile Technology Digest written by and published by . This book was released on 1992 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Structures for Advanced Power and Propulsion written by and published by . This book was released on 1993 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Damage Fracture and Fatigue of Ceramic Matrix Composites written by Longbiao Li and published by Springer. This book was released on 2018-08-27 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.