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Effects Of Increased Interfacial Strength On The Fatigue Crack Growth Resistance Crack Opening Displacements And Interfacial And Fibre Strength Degradation In A Tiss 21s Sc6 Composite
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Book Synopsis Effects of Increased Interfacial Strength on the Fatigue Crack Growth Resistance, Crack Opening Displacements and Interfacial and Fibre Strength Degradation in a Tiß 21S/SC6 Composite by : Figen Kaya
Download or read book Effects of Increased Interfacial Strength on the Fatigue Crack Growth Resistance, Crack Opening Displacements and Interfacial and Fibre Strength Degradation in a Tiß 21S/SC6 Composite written by Figen Kaya and published by . This book was released on 2003 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Increased Interfacial Strength on the Fatigue Crack Growth Resistance, Crack Opening Displacements and Interfacial and Fibre Strength Degradation in a Ti [beta] 21S/SCS 6 Composite by : Figen Kaya
Download or read book Effects of Increased Interfacial Strength on the Fatigue Crack Growth Resistance, Crack Opening Displacements and Interfacial and Fibre Strength Degradation in a Ti [beta] 21S/SCS 6 Composite written by Figen Kaya and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Increased Interfacial Strength on the Fatigue Crack Growth Resistance, Crack Opening Displacements and Interfacial and Fibre Strength Degradation in a Ti Β 21S/SCS 6 Composite by : Figen Kaya
Download or read book Effects of Increased Interfacial Strength on the Fatigue Crack Growth Resistance, Crack Opening Displacements and Interfacial and Fibre Strength Degradation in a Ti Β 21S/SCS 6 Composite written by Figen Kaya and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Crack Growth and Crack Bridging in SCS-6/Ti-24-11 by : LJ. Ghosn
Download or read book Fatigue Crack Growth and Crack Bridging in SCS-6/Ti-24-11 written by LJ. Ghosn and published by . This book was released on 1994 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interfacial damage induced by relative fiber/matrix sliding was found to occur in the bridged zone of unidirectional SCS-6/Ti-24Al-11Nb intermetallic matrix composite specimens subjected to fatigue crack growth conditions. The degree of interfacial damage was not uniform along the bridged crack wake. Higher damage zones were observed near the machined notch in comparison to the crack tip. The interfacial friction shear strength, ?f, measured in the crack wake using pushout testing revealed lower values than the as-received interface. Interfacial wear also reduced the strength of the bridging fibers. The reduction in fiber strength is thought to be a function of the magnitude of relative fiber/matrix displacements and the degree of interfacial damage. Furthermore, two different fiber bridging models were used to predict the influence of bridging on the fatigue crack driving force. The shear lag model required a variable ?f in the crack wake (reflecting the degradation of the interface) before its predictions agreed with trends exhibited by the experimental data. The fiber pressure model did an excellent job in predicting both the FCG data and the ?COD in the bridged zone even though it does not require a knowledge of ?f.
Book Synopsis An Approach to Include Interfacial Wear Effects in Modeling Fatigue Crack Growth of Titanium Matrix Composites by : BM. Hillberry
Download or read book An Approach to Include Interfacial Wear Effects in Modeling Fatigue Crack Growth of Titanium Matrix Composites written by BM. Hillberry and published by . This book was released on 1998 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: An approach has been developed that includes the effects of interfacial wear on the fiber-bridging behavior of titanium matrix composites during fatigue crack propagation. This approach uses a Coulomb friction-based fiber-bridging model in which the effect of fiber surface roughness on the clamping stress between the fiber and matrix is included. A previously developed wear model has been incorporated into this bridging model as a means to determine the reduction of the fiber surface roughness amplitude during fatigue cycling. As the roughness decreases, its contribution to the clamping stress also decreases, resulting in a lower interfacial shear stress. In order to include this effect in model fatigue crack growth rates, the combined Coulomb friction and wear models have been applied to a discrete composite model formulation. Crack growth predictions were then performed using a single set of input parameters by allowing the fiber surface roughness to decrease due to wear over a discrete increment of fatigue crack geometry based on bridging conditions determined by the composite model. These predictions correlated very well with experimental results for different loading conditions, especially those at relatively high crack growth rates.
Book Synopsis Crack Propagation and Fracture Resistance Behavior Under Fatigue Loading of a Ceramic Matrix Composite by : Dipankar Ghosh
Download or read book Crack Propagation and Fracture Resistance Behavior Under Fatigue Loading of a Ceramic Matrix Composite written by Dipankar Ghosh and published by . This book was released on 2001 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary objectives of this research are fabrication of a tough fiber reinforced ceramic composite, study of the fracture resistance behavior (R - curve) under fatigue loading, and in situ study of the crack propagation under fatigue conditions both at room and elevated temperatures. Silicon carbide fiber (SCS-6) reinforced zircon (ZrSiO 4) matrix composites are used in this study. The composite is fabricated by uniaxially aligning SiC fibers into a perform and then incorporating the zircon matrix by a tape casting and lamination technique. The green body is then consolidated by hot pressing at about 1640C in a flowing nitrogen atmosphere. Thus, dense composites with uniform fiber distribution and good mechanical properties are fabricated. A novel in situ technique is used to study the crack propagation in the matrix of the composite under fatigue conditions. In situ crack propagation and fracture resistance behavior (R - curve) of these ceramic composite samples are studied both experimentally and numerically under fatigue load conditions between room temperature and 1400ʻC. The stress intensity value at crack initiation decreased with increasing temperature. The fracture resistance results showed a rising R - curve behavior with a decreasing value of the fracture resistance at elevated temperatures. In other words the slope of the R curve decreased as temperature increased, and this effect is very dramatic at 1400ʻC. Numerical analyses/iterations, based on the currently available micromechanical models, are done to determine the relationship between the bridging stress function and the R - curve behavior of the composite. Also, the effect of residual stress and constituent properties like fiber strength, interfacial shear stress etc., on the bridging stress function is also systematically studied both at room and elevated temperature. Fiber strength, Weibull modulus, and interfacial shear stress are found to have a significant effect on the bridging stress functions. Among the three parameters, fiber strength has the most dominant effect on the bridging stress functions. A comparison of the experimental and numerically calculated results on fracture behavior showed that numerical calculations matched reasonably well with the experimental R curve values over the temperature range of 20 - 1400ʻC.
Book Synopsis Investigation of Fatigue Crack Bridging in Ti/SiC Composites by X-ray Microtomography and Diffraction by : Yu-Chen Hung
Download or read book Investigation of Fatigue Crack Bridging in Ti/SiC Composites by X-ray Microtomography and Diffraction written by Yu-Chen Hung and published by . This book was released on 2009 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanics of Fatigue Crack Closure by : Wolf Elber
Download or read book Mechanics of Fatigue Crack Closure written by Wolf Elber and published by ASTM International. This book was released on 1988 with total page 671 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fibre Strength Degradation and Its Effect on Fatigue Crack Growth on Ti MMCs by : J. Liu
Download or read book Fibre Strength Degradation and Its Effect on Fatigue Crack Growth on Ti MMCs written by J. Liu and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characterization of Crack Growth Resistance Under Cyclic Loading in the Presence of an Unbridged Defect in Fiber-Reinforced Titanium Metal Matrix Composites by : P. Bowen
Download or read book Characterization of Crack Growth Resistance Under Cyclic Loading in the Presence of an Unbridged Defect in Fiber-Reinforced Titanium Metal Matrix Composites written by P. Bowen and published by . This book was released on 1996 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper considers the experimental characterization of crack growth from unbridged defects in fiber-reinforced titanium metal matrix composites subjected to cyclic loading by the use of fracture mechanics parameters. The conditions under which parameters such as the nominal applied stress intensity range, ?Kapp, the nominal maximum stress intensity factor, Kmax, and the effective stress intensity range, ?Keff, are of use, and their experimental measurement are considered. Effects of fiber fracture, stress intensity factor range, mean stress, loading configuration (bending versus tension), test temperature, crack size, crack shape, and fiber-matrix interfacial strength on fatigue crack growth resistance are highlighted. The experimental determination of crack arrest in such composites is outlined.
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 Cracking of Fiber-Reinforced Titanium Matrix Composites by : SM. Jeng
Download or read book Fatigue Cracking of Fiber-Reinforced Titanium Matrix Composites written by SM. Jeng and published by . This book was released on 1993 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fatigue crack growth behavior of a unidirectional SCS-6-fiber-reinforced Ti-6Al-2Sn-4Zr-2Mo composite has been characterized. A fatigue cracking map for several unidirectional SCS-6-fiber-reinforced titanium and titanium aluminide composites under tension-tension fatigue loading has been developed. The map is constructed based upon the fiber strength to interfacial shear strength ratio versus the applied maximum stress intensity factor. Also, the effect of fiber bridging on the effective crack driving force in the matrix is analyzed using the shear-lag model and finite element analysis.
Book Synopsis Application of Fiber Bridging Models to Fatigue Crack Growth in Unidirectional Titanium Matrix Composites by : JG. Bakuckas
Download or read book Application of Fiber Bridging Models to Fatigue Crack Growth in Unidirectional Titanium Matrix Composites written by JG. Bakuckas and published by . This book was released on 1993 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several fiber bridging models were reviewed and applied in this research to study the matrix fatigue crack growth behavior in center notched [0]8 SCS-6/Ti-15-3 and [0]4 SCS-6/Ti-6AI-4V titanium matrix composites (TMCs). Observations revealed that fatigue damage consisted primarily of matrix cracks and fiber-matrix interfacial failure in the unidirectional TMC. Fiber-matrix interface failure included fracture of the brittle reaction zone and cracking between the two carbon-rich fiber coatings. Intact fibers in the wake of the matrix cracks reduce the stress intensity factor range. Thus, an applied stress intensity factor range (?Kapp=?Spa) is inappropriate to characterize matrix crack growth behavior. Fiber bridging models were used to determine the matrix stress intensity factor range in the unidirectional TMC. In these models, the fibers in the wake of the crack are idealized as a closure pressure. An unknown constant frictional shear stress is assumed to act along the debond or slip length of the bridging fibers. In this study, the frictional shear stress was used as a curve fitting parameter to available data (crack growth data, crack opening displacement (COD) data, and debond length data). Large variations in the frictional shear stress required to fit the experimental data indicate that the fiber bridging models in their present form lack predictive capabilities. However, these models provide an efficient and relatively simple engineering method for conducting parametric studies of the matrix crack growth behavior based on constituent properties.
Book Synopsis Effects of Reaction Layer on Interfacial Shear Properties and Strength of Fiber in Silicon-Carbide (SiC) Fiber-Reinforced Titanium Alloy Composite by : C. Fujiwara
Download or read book Effects of Reaction Layer on Interfacial Shear Properties and Strength of Fiber in Silicon-Carbide (SiC) Fiber-Reinforced Titanium Alloy Composite written by C. Fujiwara and published by . This book was released on 1996 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of the interfacial thickness of the reaction layer on the interfacial shear properties and the tensile strength of double carbon-coated SCS-6 SiC fiber in Ti-15Mo-5Zr-3Al alloy matrix composite was examined. The major reaction layer thickness, that is, titanium-carbide (TiC) layer thickness, varied with heat-exposure temperature and time, respectively, and the resultant mean thickness of the reaction layer of the composite ranged from 0.4 to 1.7 ?m. The critical interfacial toughness, Gic, and the mean shear sliding resistance, ?s were evaluated by the thin specimen pushout technique. Tensile strength of the silicon-carbide (SiC) fiber extracted from the titanium alloy matrix before and after the heat exposure was determined in relationship to the thickness of the reaction layer. The critical interface toughness, Gic, for the failure of the root of the reaction layer was ?4 J/m2, and the average shear sliding resistance of the interface, ?s, was 102 to 118 MPa. The interfacial shear mechanical properties were adequate to prevent failure of the fiber due to the stress concentration caused by cracks that formed first in the reaction layer. The results showed that when the growth of reaction layer was within 1.7 ?m, the mean strength of the extracted fiber was unaffected by the existence of the reaction layer because of weak bonding between it and the fiber. However, with the increase of the reaction layer thickness, the strength distribution of the extracted fiber tended to Weibull bimodal distribution.
Book Synopsis Influences of crack closure and interfacial strength on the tensile fatigue behavior of a nicalon/CAS composite by : Warren Andrew Thomas
Download or read book Influences of crack closure and interfacial strength on the tensile fatigue behavior of a nicalon/CAS composite written by Warren Andrew Thomas and published by . This book was released on 1994 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Matrix Fatigue Crack Development in a Notched Continuous Fiber SCS-6/Ti-15-3 Composite by :
Download or read book Matrix Fatigue Crack Development in a Notched Continuous Fiber SCS-6/Ti-15-3 Composite written by and published by . This book was released on 1990 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Damage on Interfacial Crack Tip Fields by :
Download or read book Effects of Damage on Interfacial Crack Tip Fields written by and published by . This book was released on 1989 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Critical cracks can form along or near the interface between two rubbery particulate composite materials. Damage near these cracks can affect the shape and size of the crack tip fields in the two materials. In this study, finite elements are used to simulate damage near an interfacial crack tip to discover how this damage affects the crack tip fields. The effects of damage zones of different sizes on the magnitude and phase angle of the complex stress intensity factor are studied.
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