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:
Download or read book Micromechanisms of Fatigue Crack Growth and Fracture Toughness in Metal Matrix Composites written by David L. Davidson and published by . This book was released on 1989 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: A detailed micromechanics analysis has been performed on a composite of 2014 aluminum alloy matrix with 15 vol.% particulate SiC. This composite was manufactured by the Dural Co. by casting and extrusion. The matrix alloy was peak aged before testing. The microstructure was found to contain about 3% intermetallic particles in addition to those expected for this material. Fatigue cracks were grown from approximately threshold to rapid fracture stress intensities. Fatigue cracks growth rates and fracture toughness were measured. Analyses of the crack tips were performed by stereoimaging at low and intermediate stress intensities, and just prior to the onset of rapid fracture. Detailed strain maps were derived, and considerable influence of SiC on strain was found. Analyses of microcracks near the main crack were made and found to have only a small influence on fracture. Key words: Metal matrix composites, Silicon carbide reinforcement, Fatigue crack growth, Fracture toughness, Particulate strengthening, Crack growth micromechanisms. (jes).
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.
Download or read book Mechanisms of Fatigue Crack Growth in Particulate and Whisker Reinforced Aluminum Alloys written by James Joseph Mason and published by . This book was released on 1988 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue of Particle and Whisker reinforced Metal matrix Composites written by Javier Llorca and published by . This book was released on 2002 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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).
Download or read book Fatigue Crack Growth Mechanisms in Al sic Particulate Metal Matrix Composites written by O. Botstein and published by . This book was released on 1990 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Elsevier Sequoia : The Netherlands.
Download or read book Modelling of Crack Propagation Mechanism in Particle reinforced Metal Matrix Composites written by Roberto Iannuzzi (ingegnere) and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Micro Mechanical Analysis of Damage Growth and Fracture in Discontinuous Fiber Reinforced Metal Matrix Composites written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2019 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The near-crack-tip stresses in any planar coupon of arbitrary geometry subjected to mode 1 loading may be equated to those in an infinite center-cracked panel subjected to the appropriate equivalent remote biaxial stresses (ERBS). Since this process can be done for all such mode 1 coupons, attention may be focused on the behavior of the equivalent infinite cracked panel. To calculate the ERBS, the constant term in the series expansion of the crack-tip stress must be retained. It is proposed that the ERBS may be used quantitatively to explain different fracture phenomena such as crack branching. Goree, James G. and Richardson, David E. NASA-CR-187020, NAS 1.26:187020 NAG1-971...
Download or read book Fatigue Crack Growth Mechanisms in Titanium Metal Matrix Composites written by and published by . This book was released on 1996 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report details studies carried out to identify the high temperature fatigue crack growth damage mechanisms in fiber-reinforced titanium metal matrix composites. The report consists of eight separate sections. In the first section, the fatigue and fatigue crack growth characteristics in neat laminates made of Timetal 21S were studied in relation to both temperature and loading frequency effects. The second section deals with the evolution of the thermal residual stresses in the composite when cooling from consolidation temperature or subjecting the composite to thermal cycles. A new mechanical simulation method capable of measuring the induced residual stress on real time basis has been developed in this study. The third section extends this issue to the time-dependent internal stress and strain states of MMCs under the thermomechanical loading conditions. Here, a new micromechanical model employing the four-phase concentric cylinder configuration has been proposed. Based on this model, the time-dependent behavior of continuous fiber reinforced metal matrix composites. It has been evaluated. These results are presented in the fourth section. The fifth, sixth and seventh sections of this report describe the influence of temperature and loading frequency on the crack growth process and suggest a fatigue-creep interactive mechanism acting at the crack tip during high temperature loadings. The last section of the report deals with the determination of the stress evolution in bridging fibers during the fatigue crack growth in SM 1240/Timetal-21S composite using the finite element method. Several parameters affecting this evolution were considered; namely, the process-induced residual stress, the creep characteristics of the matrix layer surrounding the fiber, the test temperature and the loading frequency.
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:
Download or read book Fatigue Mechanisms in Metallic Matrix Composites written by and published by . This book was released on 1996 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue crack growth in alumina particulate reinforced Ni3Al alloy composites, IC-50/Al2O3, fabricated using a spray deposition and co-injection process was examined and compared with that in a conventional nickel-based superalloy, Inconel 718. Single edge-notched fatigue crack growth specimens were tested under constant dK conditions using a custom fully automated servo-hydraulic test system. The results indicate that the threshold value of dK is at least as high as that for monolithic IC-5O, regardless of whether the composite is in the as-sprayed or HIPed condition. However, the HIPed microstructure exhibits a higher fatigue crack growth resistance in the Paris law regime compared to the as-sprayed material. Both composites exhibit a lower crack growth resistance compared to that for unreinforced IC-5O. Compared with Inconel 718, the present IC-5O MMCs consistently exhibit substantially better fatigue crack growth resistance properties.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue Crack Growth in Selectively Reinforced Titanium Metal Matrix Composites written by T. J. A. Doel and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanical Properties and Fatigue Crack Propagation Behavior of Hybrid Metal Matrix Composites written by Byung J. Lee and published by . This book was released on 1996 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Damage and Interfacial Debonding in Composites written by D.H. Allen and published by Elsevier. This book was released on 1996-07-18 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by leading authorities in the field of damage and micromechanics of composites, this book deals mainly with the damage impaired in composites due to different types of loading. It examines the different types of damage in composites in the fiber, matrix, debonding and delamination. It also reviews the theoretical characterization of damage, its experimental determination as well as the numerical simulation of damage.
