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Observations Of Fatigue Crack Initiation And Damage Growth In Notched Titanium Matrix Composites
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722449193 Total Pages :38 pages Book Rating :4.4/5 (491 download)
Book Synopsis Observations of Fatigue Crack Initiation and Damage Growth in Notched Titanium Matrix Composites by : National Aeronautics and Space Administration (NASA)
Download or read book Observations of Fatigue Crack Initiation and Damage Growth in Notched Titanium Matrix Composites written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-09 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose was to characterize damage initiation and growth in notched titanium matrix composites at room temperature. Double edge notched or center open hole SCS-6/Ti-15-3 specimens containing 0 deg plies or containing both 0 and 90 deg plies were fatigued. The specimens were tested in the as-fabricated (ASF) and in heat-treated conditions. A local strain criterion using unnotched specimen fatigue data was successful in predicting fatigue damage initiation. The initiation stress level was accurately predicted for both a double edge notched unidirectional specimen and a cross-plied center hole specimen. The fatigue produced long multiple cracks growing from the notches. These fatigue cracks were only in the matrix material and did not break the fibers in their path. The combination of matrix cracking and fiber/matrix debonding appears to greatly reduce the stress concentration around the notches. The laminates that were heat treated showed a different crack growth pattern. In the ASF specimens, matrix cracks had a more tortuous path and showed considerable more crack branching. For the same specimen geometry and cyclic stress, the (0/90/0) laminate with a hole had far superior fatigue resistance than the matrix only specimen with a hole. Naik, R. A. and Johnson, W. S. Langley Research Center RTOP 505-63-01-05...
Book Synopsis Observations of Fatigue Crack Initiation and Damage Growth in Notched Titanium Matrix Composites by :
Download or read book Observations of Fatigue Crack Initiation and Damage Growth in Notched Titanium Matrix Composites written by and published by . This book was released on 1990 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Composite Materials by : T. Kevin O'Brien
Download or read book Composite Materials written by T. Kevin O'Brien and published by ASTM International. This book was released on 1991 with total page 831 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of Fatigue Behavior In Notched Cross-Ply Titanium Metal Matrix Composite at Elevated Temperature by :
Download or read book Investigation of Fatigue Behavior In Notched Cross-Ply Titanium Metal Matrix Composite at Elevated Temperature written by and published by . This book was released on 1992 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research was to investigate the initiation and progression of damage which develops in notched (0/90) sub 2S SCS-6/Ti-15-3 at elevated temperature. Testing consisted of a monotonic tensile test at 427 deg C followed by fatigue testing performed under load control with a stress ratio of 0.1 at a frequency of 10 Hz. A crack was defined to have initiated when it had attained a length greater than or equal to 0.124 mm. Crack initiation and progression was monitored by strain and modulus observations and visual inspection via telemicroscope. The cracks were recorded with edge and face replicas. Metallographic and fractographic analysis was performed after specimen failure. Fatigue cracks initiated in the matrix at four locations on the front and back faces of each specimen. Two of these cracks became through-cracks and eventually developed into major cracks which caused the fracture. The applied stress (S) and fatigue lives (N) curves for both initiation and fatigue life were established. Also, crack growth curves as the function of fatigue cycles were established. A detailed metallographic analysis was performed to understand the damage mechanisms and its implication on the observed notched fatigue behavior.
Book Synopsis Fatigue Crack Initiation and Damage Evolution of Unnotched Titanium Matrix Composites by : Yung-Chiun Her
Download or read book Fatigue Crack Initiation and Damage Evolution of Unnotched Titanium Matrix Composites written by Yung-Chiun Her and published by . This book was released on 1998 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Life Prediction Methodology for Titanium Matrix Composites by : W. Steven Johnson
Download or read book Life Prediction Methodology for Titanium Matrix Composites written by W. Steven Johnson and published by ASTM International. This book was released on 1996 with total page 625 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers presented at the March 1994 symposium are organized into five sections that progress from basic understanding of mechanical damage mechanisms and environmental effects to life prediction methodology. Five papers discuss the interplay between interfacial strength, residual thermal stresses, an
Book Synopsis Prediction of Matrix Fatigue Crack Initiation in Notched SCS-6/Ti-15-3 Metal Matrix Composites by :
Download or read book Prediction of Matrix Fatigue Crack Initiation in Notched SCS-6/Ti-15-3 Metal Matrix Composites written by and published by . This book was released on 1991 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Damage Growth Mechanisms in Continuous Fiber Reinforced Titanium Matrix Composites by :
Download or read book Fatigue Damage Growth Mechanisms in Continuous Fiber Reinforced Titanium Matrix Composites written by and published by . This book was released on 1990 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Prediction of Matrix Fatigue Crack Initiation from Notches in Titanium Matrix Composites by : DJ. Herrmann
Download or read book Prediction of Matrix Fatigue Crack Initiation from Notches in Titanium Matrix Composites written by DJ. Herrmann and published by . This book was released on 1996 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue crack initiation from notches in titanium matrix composites (TMCs) is of interest in the design of TMC structures. A model is presented for predicting the fatigue crack initiation life of longitudinal, transverse, and symmetric cross-ply laminates using the strain-life behavior of the matrix material. The effective strain parameter, ??eff, proposed by Hillberry and Johnson is used to account for the residual stress state imposed during composite processing. Since the effective strain parameter requires knowledge of the local residual and applied strain in the matrix, methods for calculating these strains are developed. Model predictions were verified with crack initiation tests of [0]4, [90]4, and [0/90]s SCS-6/TIMETAL 21S center-hole specimens at room temperature and [04/ ̄90]s SCS-6/Ti-15-3 center-hole specimens at 300 and 550°C.
Book Synopsis Titanium Matrix Composites by : Shankar Mall
Download or read book Titanium Matrix Composites written by Shankar Mall and published by CRC Press. This book was released on 2020-01-29 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: A review and summary of advancements related to mechanical behavior and related mechanics issues of titanium matrix composites (TMCs), a class of high-temperature materials useful in the propulsion and airframe components in advanced aerospace systems. After an introduction to TMCs, different authors review and summarise the advancements related to mechanical behavior and related mechanics issues of TMCs.
Book Synopsis Damage Development in Titanium Metal Matrix Composites Subjected to Cyclic Loading by :
Download or read book Damage Development in Titanium Metal Matrix Composites Subjected to Cyclic Loading written by and published by . This book was released on 1992 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 1020 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanical Properties of Metallic Composites by : Shojiro Ochiai
Download or read book Mechanical Properties of Metallic Composites written by Shojiro Ochiai and published by CRC Press. This book was released on 1993-12-17 with total page 832 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides coverage of dispersion-hardened and fibre-reinforced alloys, addressing principal mechanisms, processing and applications. Mechanical behaviour based on dislocation theory and elastic-plastic mechanics is dealt with and data on advanced composites are provided.
Book Synopsis Fatigue Damage in Cross-ply Titanium Metal Matrix Composites Containing Center Holes by :
Download or read book Fatigue Damage in Cross-ply Titanium Metal Matrix Composites Containing Center Holes written by and published by . This book was released on 1992 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
