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Micromechanisms Of Fatigue Crack Growth And Fracture Toughness In Metal Matrix Composites
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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 Micromechanisms of Crack Growth and Fracture Toughness in Metal Matrix Composites by : D. L. Davidson
Download or read book Micromechanisms of Crack Growth and Fracture Toughness in Metal Matrix Composites written by D. L. Davidson and published by . This book was released on 1986 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: Subcritical crack growth and rapid fracture of the mechanically alloyed aluminum alloy IN-9052 reinforced with SiC particles have been investigated. Fatigue crack growth rates for the composite exceed those of the unreinforced alloy, except that the threshold stress intensity for growth is higher for the composite. Fracture toughness of the composite is about 9 square root of M cubed compared to a (reported) value of 29 square root of M cubed for the unreinforced alloy. The contributions to fracture toughness from work done within the plastic zone and in formation of the void sheet have been computed using analytical models. Fracture toughness is shown to result almost entirely from work done within the plastic zone of the growing crack. The matrix microstructure and the particulate characteristics are found to account for the elastic and fracture properties of this composite.
Book Synopsis Micromechanisms of Fatigue Crack Propagation in Particulate-reinforced Metal Matrix Composites by : Jianku Shang
Download or read book Micromechanisms of Fatigue Crack Propagation in Particulate-reinforced Metal Matrix Composites written by Jianku Shang and published by . This book was released on 1989 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling of Micromechanisms of Fatigue and Fracture in Hybrid Materials by : R. O. Ritchie
Download or read book Modeling of Micromechanisms of Fatigue and Fracture in Hybrid Materials written by R. O. Ritchie and published by . This book was released on 1988 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: The obvious benefits of the design of aerospace structures using lighter materials with high specific strengths and stiffness has led in recent years to the development of numerous reinforced composite materials, which have become serious commercial competitors to traditional monolithic metallic alloys. While significant advances in processing technology have made the fabrication of such hybrid materials more of an economic reality, their widespread use in airframes or other critical structures has in general been limited by serious deficiencies in particular mechanical properties, such as ductility, toughness and fatigue. This problem is often compounded by the lack of fundamental studies which provide a rational basis for the underlying sources of crack-propagation resistance in these materials, and in particular which define the critical role of composite microstructure. Accordingly, the current program is aimed at studying the physics and micromechanisms of fracture toughness and particularly the fatigue-crack growth resistance in laminate, discontinuously-reinforced and continuously-reinforced metal-matrix composites, with special reference to the role of microstructure. Keywords: Fatigue(Mechanics); Fracture toughness; Subcritical crack growth; Metal-Matrix; Composites; Laminates; Fatigue cracks; Crack closure; Crack bridging; Aluminum alloys; Magnesium alloys; Crack propagation. (jes).
Book Synopsis Fatigue Crack Propagation in Metals and Alloys by : Ulrich Krupp
Download or read book Fatigue Crack Propagation in Metals and Alloys written by Ulrich Krupp and published by John Wiley & Sons. This book was released on 2007-06-27 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive overview of the whole field of fatigue and fracture of metallic materials covers both the theoretical background and some of the latest experimental techniques. It provides a summary of the complex interactions between material microstructure and cracks, classifying them with respect to the overall damage process with a focus on microstructurally short cracks and dynamic embrittlement. It furthermore introduces new concepts for the numerical treatment of fatigue microcrack propagation and their implementation in fatigue-life prediction models.This comprehensive overview of the whole field of fatigue and fracture of metallic materials covers both the theoretical background and the latest experimental techniques. It provides a summary of the complex interactions between material microstructure and cracks, classifying them with respect to the overall damage process. It furthermore introduces new concepts for the numerical treatment of fatigue microcrack propagation and their implementation in fatigue-life prediction models.
Download or read book Fatigue of Materials written by S. Suresh and published by Cambridge University Press. This book was released on 1998-10-29 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by a leading researcher in the field, this revised and updated second edition of a highly successful book provides an authoritative, comprehensive and unified treatment of the mechanics and micromechanisms of fatigue in metals, non-metals and composites. The author discusses the principles of cyclic deformation, crack initiation and crack growth by fatigue, covering both microscopic and continuum aspects. The book begins with discussions of cyclic deformation and fatigue crack initiation in monocrystalline and polycrystalline ductile alloys as well as in brittle and semi-/non-crystalline solids. Total life and damage-tolerant approaches are then introduced in metals, non-metals and composites followed by more advanced topics. The book includes an extensive bibliography and a problem set for each chapter, together with worked-out example problems and case studies. This will be an important reference for anyone studying fracture and fatigue in materials science and engineering, mechanical, civil, nuclear and aerospace engineering, and biomechanics.
Book Synopsis Fracture and Fatigue by : Lawrence J. Broutman
Download or read book Fracture and Fatigue written by Lawrence J. Broutman and published by . This book was released on 1974 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Micromechanisms of Cyclic and Environmentally-Assisted Subcritical Crack Growth in Ceramic-Matrix Composites by :
Download or read book Micromechanisms of Cyclic and Environmentally-Assisted Subcritical Crack Growth in Ceramic-Matrix Composites written by and published by . This book was released on 1991 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: The future use of ceramics for advanced structural applications represents an important precursor to potential major improvements in design performance for high temperature, corrosion and wear resistance applications. The limited use of such brittle materials to date has primarily been attributed to their inherently low toughness and lack of defect tolerance. Scientific research in the last decade, however, has resulted in major advances in the toughening of ceramics by such mechanisms as whisker reinforcement, transformation and microcrack toughening. However, very recent work has shown that such toughened ceramics and composites, contrary to conventional wisdom, may become susceptible to cyclic fatigue. The intent of this program was to study and model the physics and fundamental micromechanisms of environmentally- assisted and principally cyclic fatigue crack-growth processes in several classes of ceramic-matrix composites, chosen to reflect different primary toughening mechanisms. Based on initial studies, the central hypothesis of this work is that the mechanisms of crack-tip shielding, used to enhance fracture toughness, can lead to degradation in crack-growth resistance under cyclic loading. Cyclic Fatigue, Fracture Toughness, Subcritical Crack Growth, Ceramic Matrix Composites, Small Cracks.
Book Synopsis Modeling Fatigue Crack Growth in Cross Ply Titanium Matrix Composites by :
Download or read book Modeling Fatigue Crack Growth in Cross Ply Titanium Matrix Composites written by and published by . This book was released on 1993 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue and Fracture Branch: A Compendium of Recently Completed and On-going Research Projects by :
Download or read book Fatigue and Fracture Branch: A Compendium of Recently Completed and On-going Research Projects written by and published by . This book was released on 1984 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue of Materials by : Subra Suresh
Download or read book Fatigue of Materials written by Subra Suresh and published by Cambridge University Press. This book was released on 1998-10-29 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by a leading researcher in the field, this revised and updated second edition of a highly successful book provides an authoritative, comprehensive and unified treatment of the mechanics and micromechanisms of fatigue in metals, non-metals and composites. The author discusses the principles of cyclic deformation, crack initiation and crack growth by fatigue, covering both microscopic and continuum aspects. The book begins with discussions of cyclic deformation and fatigue crack initiation in monocrystalline and polycrystalline ductile alloys as well as in brittle and semi-/non-crystalline solids. Total life and damage-tolerant approaches are then introduced in metals, non-metals and composites followed by more advanced topics. The book includes an extensive bibliography and a problem set for each chapter, together with worked-out example problems and case studies. This will be an important reference for anyone studying fracture and fatigue in materials science and engineering, mechanical, civil, nuclear and aerospace engineering, and biomechanics.
Book Synopsis Application of Fiber Bridging Models to Fatigue Crack Growth in Unidirectional Titanium Matrix Composites by :
Download or read book Application of Fiber Bridging Models to Fatigue Crack Growth in Unidirectional Titanium Matrix Composites written by and published by . This book was released on 1992 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advances in Research on the Strength and Fracture of Materials by : D.M.R. Taplin
Download or read book Advances in Research on the Strength and Fracture of Materials written by D.M.R. Taplin and published by Elsevier. This book was released on 2013-10-22 with total page 873 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Research on the Strength and Fracture of Materials: Volume 1s—An Overview contains the proceedings of the Fourth International Conference on Fracture held at the University of Waterloo, Canada, in June 1977. The papers review the state of the art with respect to fracture in a wide range of materials such as metals and alloys, polymers, ceramics, and composites. This volume is comprised of 40 chapters and opens with a discussion on progress in the development of elementary fracture mechanism maps and their application to metal deformation processes, along with micro-mechanisms of fracture and the fracture toughness of engineering alloys. The next section is devoted to the fracture of large-scale structures such as steel structures, aircraft, cargo containment systems, nuclear reactors, and pressure vessels. Fracture at high temperatures and in sensitive environments is then explored, paying particular attention to creep failure by cavitation under non-steady conditions; the effects of hydrogen and impurities on brittle fracture in steel; and mechanism of embrittlement and brittle fracture in liquid metal environments. The remaining chapters consider the fracture of non-metallic materials as well as developments and concepts in the application of fracture mechanics. This book will be of interest to metallurgists, materials scientists, and structural and mechanical engineers.
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 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High Temperature/High Frequency Fatigue Crack Growth in Titanium Metal Matrix Composites by : H. Ghonem
Download or read book High Temperature/High Frequency Fatigue Crack Growth in Titanium Metal Matrix Composites written by H. Ghonem and published by . This book was released on 1996 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study was conducted to examine the effects of high temperature/high frequency loading on the crack growth behavior in titanium composites. Fatigue crack growth tests were performed on the unidirectional SM 1240/TIMETAL-21S composite in air environment at three different temperatures: 24, 500, and 650?gC with a loading frequency of 10 Hz and a stress ratio of 0.1. Tests were also carried out in vacuum and on aged specimens. In all the tests, the crack length was measured continuously while the crack opening displacement (COD) was measured at discrete positions along the crack length. Results show that, at all temperatures, the crack progresses in two sequential stages; a stage in which the crack growth rate decreases as the crack length increases followed by a stage characterized by an accelerated crack growth rate. The first stage corresponds to a crack-bridging condition and is the focus of the analysis in this paper. In additional to COD measurements, the microstructural features associated with the fracture process during this stage was examined by scanning electron microscopy with emphasis being placed on the matrix crack morphology, debonding location, temperature, and environmental influences on the fiber coatings. An analytical procedure, employing concepts of the theory of fracture mechanics and micromechanics analysis of the stress state along bridging fibers, was applied in order to calculate the fiber-bridging stress, the frictional shear stress, and the effective stress intensity factor. Results of this work suggest that the fiber-bridging stress and the frictional shear stress are variables along the crack length and are test temperature dependents. Furthermore, it was concluded that both the crack-tip opening displacement and the effective stress intensity factor can be used as measurements of the crack-tip driving force in the crack-bridging stage. Based on the experimental and analytical results collected in this study, a bridging damage mechanism under the loading condition specified here is suggested. This mechanism argues that the effect of temperature on the high frequency crack growth process is established through the temperature-related modification of the frictional shear stress and the resulting adjustment of the internal stress state in the debonded regions of the bridging fibers.
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 Crack Growth and Fracture of Continuous Fiber Metal Matrix Composites by : LR. Dharani
Download or read book Crack Growth and Fracture of Continuous Fiber Metal Matrix Composites written by LR. Dharani and published by . This book was released on 1989 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is reasonably well accepted that the standard procedures developed for isotropic homogeneous metals using linear elastic fracture mechanics models are not appropriate for either continuously or discontinuously reinforced metal matrix composites. For example, the ASTM plane strain fracture toughness test methods typically give widely different values of fracture toughness depending on the particular test specimen geometry as well as the fiber orientation. For unidirectional boron/aluminum composites one finds approximately a factor of two difference between the measured values of fracture toughness obtained from a center-notched test coupon and that given by a compact tension specimen. In particular for unidirectional composites, and to a slightly lesser degree for angle ply laminates, the dominant controlling mechanism for this behavior is matrix plasticity. A secondary toughening mechanism, resulting from the matrix plasticity, is stable transverse fiber failure. The present paper will focus on both the influence of the large plastic zone at the end of the notch and on the constraint that the fibers impose on the shape of this zone, as well as the transverse crack growth. First, a review of some particular experimental studies and methods of analysis for predicting crack growth and fracture of notched unidirectional metal matrix composites is given. Next, two mechanistic models for unidirectional composites with damage are presented. The first is an improved shear lag model that accounts for both of the above damage modes, and the second describes a recent extension of the shear lag concept in an attempt to include transverse stresses. A related finite width laminate model is then discussed, and it is indicated that an isotropic finite width correction factor is reasonably accurate for most center-notched test coupons.
