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Environmentally Assisted Fatigue Crack Development In Aluminium Based Metal Matrix Composites
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Book Synopsis Environmentally Assisted Fatigue Crack Development in Aluminium-based Metal Matrix Composites by : Julia Diane Shields
Download or read book Environmentally Assisted Fatigue Crack Development in Aluminium-based Metal Matrix Composites written by Julia Diane Shields and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Environmentally Assisted Fatique Crack Development in Aluminium-based Metal Matrix Composites by : Julia Diane Shields
Download or read book Environmentally Assisted Fatique Crack Development in Aluminium-based Metal Matrix Composites written by Julia Diane Shields and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanisms of Fatigue Crack Growth in Particulate and Whisker Reinforced Aluminum Alloys by : James Joseph Mason
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:
Book Synopsis Fatigue Crack Growth and Retardation Due to Overloads in Metal-matrix Composites by : C. T. Sun
Download or read book Fatigue Crack Growth and Retardation Due to Overloads in Metal-matrix Composites written by C. T. Sun and published by . This book was released on 1986 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fatigue crack growth in a Boron-Aluminum metal matrix composite is investigated. The material consists of II plies of diffusion bonded 5.6 mil boron fibers in a 6061 aluminum matrix. In this study, the composite is characterized as an orthotropic elastic-plastic material using uniaxial test specimens. The constraint effect of the plasticity encountered in specimens with stress gradients is characterized using a tapered specimen. The modeling is verified on a specimen with a centered circular hole and specimens with transverse and oblique fatigue cracks. A series of baseline fatigue tests are performed an transverse and oblique fatigue cracks. The baseline tests are run at room temperature using a 10 Hz sinusoidal loading with a minimum applied load near zero. An effective stress intensity factor is developed to correlate all the baseline fatigue data. Overload tests are carried out on transverse and oblique cracked specimens. The specimens are cycled as was done in the baseline tests, and a single tensile overload was performed Cyclic loading to near failure followed. The post-overload crack growth behavior first accelerates, then decelerates. This crack growth eventually assumes its pre-overload state.
Book Synopsis An Investigation of Fatigue Crack Growth Behavior in Cast Particulate Reinforced Aluminum Alloys by : Anthony George Keslinke
Download or read book An Investigation of Fatigue Crack Growth Behavior in Cast Particulate Reinforced Aluminum Alloys written by Anthony George Keslinke and published by . This book was released on 1990 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Crack Propagation in Laminated Aluminum Composites by : Paul Bradley Hoffman
Download or read book Fatigue Crack Propagation in Laminated Aluminum Composites written by Paul Bradley Hoffman and published by . This book was released on 1994 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
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 Fatigue Crack Growth Mechanisms in Al-sic Particulate Metal Matrix Composites by : O. Botstein
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.
Book Synopsis Modeling of Environmentally Assisted Fatigue Crack Growth Behavior by : Phani Chandar Reddy Sree
Download or read book Modeling of Environmentally Assisted Fatigue Crack Growth Behavior written by Phani Chandar Reddy Sree and published by . This book was released on 2015 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The formation of fatigue cracks and their propagation due to cyclic loading in metals have been a concern for more than hundred years. Since fatigue failure were first reported by the railroad industry in 1840s, tremendous progress has been achieved in understanding fatigue behavior of metals. But fatigue damage is still a concern due to its complex dependency on various environmental variable like humidity, temperature, time and corrosive environment. Although numerous theories and models have been proposed in the past, the effects of environment on fatigue crack growth (FCG) is not completely understood. This dissertation aims to shed light on the effect of environment on the FCG behavior in metals through experimental techniques (Part-I) and modeling (Part- II). Using the available concepts in literature and the generated experimental data, a new fatigue model is proposed which accounts for thickness, stress ratio and environmental effects on FCG behavior. The slow-strain-rate tests revealed that the effect of liquid-air interface on tensile behavior of Al 7075-T651 can be explained by a concept of chemical notch at the liquid-air interface. The FCG behavior of Al 7075-T651 alloy in air and in vacuum were investigated by using an earlier developed custom matrix method based on [delta]K and Kmax. The FCG data generated revealed the influence of stress ratio,(R), thickness and environment (air and vacuum) on FCG behavior. A new FCG model presented in Part-II includes the environmental effect through change in crack tip angle. In this model the mechanical fatigue damage is based on the two parameter approach, [delta]K and Kmax. The model predictions of R-ratio, thickness and environment effects on FCG behavior in metals is compared with available data published in the literature and fairly good agreement was found.
Book Synopsis Fatigue Crack Growth in Unidirectional Metal Matrix Composite by : Louis J. Ghosn
Download or read book Fatigue Crack Growth in Unidirectional Metal Matrix Composite written by Louis J. Ghosn and published by . This book was released on 1990 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Micromechanisms of Fatigue Crack Growth and Fracture Toughness in Metal Matrix Composites by : David L. Davidson
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 1987 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue crack growth and fracture toughness of seven combinations of aluminum matrix alloys reinforced with particulate silicon carbide have been measured. The matrix alloys used were of both the work hardening and heat treatable varieties. Two of the alloys were made by mechanical alloying--powder metallurgy fabrication methods and the remainder were made by ingot metallurgy. Composites were tested in both as-received (extruded) and peakaged conditions. Fractography was done for all the composites, as were cross sections to examine surface roughness.
Book Synopsis Fatigue Testing and Damage Development in Continuous Fiber Reinforced Metal Matrix Composites by : W. S. Johnson
Download or read book Fatigue Testing and Damage Development in Continuous Fiber Reinforced Metal Matrix Composites written by W. S. Johnson and published by . This book was released on 1988 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Fatigue Crack Growth Resistance of as Processed and Heat Treated Continuous Fibre Reinforced Titanium Based Metal Matrix Composites by : Stephen Victor Sweby
Download or read book Fatigue Crack Growth Resistance of as Processed and Heat Treated Continuous Fibre Reinforced Titanium Based Metal Matrix Composites written by Stephen Victor Sweby and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Illuminating the Chemo-mechanics of Environment Assisted Fatigue in Aluminum by : Richard James Zamora
Download or read book Illuminating the Chemo-mechanics of Environment Assisted Fatigue in Aluminum written by Richard James Zamora and published by . This book was released on 2015 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation composes three papers detailing work intended to illuminate the atomistic-scale mechanisms governing environment assisted fatigue crack growth in aluminum. All studies focus on the application of concurrent atomistic-continuum multiscale modeling, utilizing the coupled atomistic and discrete dislocation (CADD) methodology. First, an ab-initio prediction of environmental embrittlement in aluminum is demonstrated using a density functional theory (DFT) based multiscale framework to simulate the behavior of a loaded crack-tip in the presence of both elemental oxygen and hydrogen impurities. The multiscale simulations and subsequent analysis suggest that electronegative surface impurities can inhibit dislocation nucleation from a crack-tip, which is consistent with macroscopic brittle failure. Second, a series of ab-initio and multiscale simulations are performed, directly linking an atomistic mechanism of hydrogen-assisted cracking (HAC) to experimental fatigue data. The mechanism of enhanced surface deformation is demonstrated using an aluminum-only interatomic potential capable of reproducing ab-initio trends by strategically shielding critical surface bonds in accordance with the environmental exposure level. The strategic shielding approach is used within a CADD-based model to predict an embrittling effect of hydrogen on near threshold fatigue crack growth rates. Third, a CADD-based model is used to simulate the approximate effects of monolayer surface layer stiffening on near-threshold fatigue behavior in aluminum. Stiff surface layer effects are investigated by adding a Lennard-Jones overlay potential to exposed aluminum crack-face atoms. For the single crystal orientation studied, we find that deformation behavior generally begins with a short period of fast transient crack-tip propagation until a stable defect structure has accumulated ahead of the crack. Additionally, the approximate effects of stiff monolayer surface-film formation are found to inhibit crack growth by resisting typical slip-plane cracking behavior. For all studies, the results are discussed in terms of the current environment assisted fatigue literature.
