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The Effects Of Thermal Cycling On The Strength Of Aluminum Graphite Composites
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Book Synopsis The Effects of Thermal Cycling on the Strength of Aluminum-Graphite Composites by : William C Harrigan (Jr)
Download or read book The Effects of Thermal Cycling on the Strength of Aluminum-Graphite Composites written by William C Harrigan (Jr) and published by . This book was released on 1974 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: Room temperature tensile tests were conducted on specimens of 6061 aluminum-Thornel 50 graphite composite after thermal exposure for up to 3000 hours at 465C and thermal cycling between room temperature and 485C or 400C for up to 5000 cycles. These tests demonstrate that the ultimate strength of the composite is not affected by thermal exposure at 465C for 3000 hours or by thermal cycling between room temperature and 400C for 5000 cycles. The tensile modulus is also unaffected by exposure at 465C or cycling to 400C. Cycling between room temperature and 485C for 5000 cycles causes a 9% decrease in the strength with no decrease in modulus. (Author).
Book Synopsis Effects of Thermal Cycling on Graphite-fiber-reinforced 6061 Aluminum by : Gregory A. Dries
Download or read book Effects of Thermal Cycling on Graphite-fiber-reinforced 6061 Aluminum written by Gregory A. Dries and published by . This book was released on 1986 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Thermal Exposure on the Mechanical Properties of Aluminum-graphite Composites by :
Download or read book The Effect of Thermal Exposure on the Mechanical Properties of Aluminum-graphite Composites written by and published by . This book was released on 1975 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Thermal Cycling on Graphie-fiber-reinforced 6061 Aluminum by :
Download or read book Effects of Thermal Cycling on Graphie-fiber-reinforced 6061 Aluminum written by and published by . This book was released on 1986 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of an Aluminum - Graphite Composite by : Roger T. Pepper
Download or read book Development of an Aluminum - Graphite Composite written by Roger T. Pepper and published by . This book was released on 1970 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: A composite consisting of an aluminum alloy matrix and a graphite fiber reinforcement was developed with strengths exceeding the 'rule of mixture' strength of 101 ksi. The composite is not degraded by temperature to 550C or by thermal cycling from -193 to +500C. The importance of various processing techniques to the successful development of this composite and the effects of certain process variables on properties are discussed. (Author).
Book Synopsis Effects of Thermal Cycling Environment on Graphite/Epoxy Composites by : JL. Camahort
Download or read book Effects of Thermal Cycling Environment on Graphite/Epoxy Composites written by JL. Camahort and published by . This book was released on 1976 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Graphite/epoxy (Gr/E) composites have attractive properties--low density, high stiffness, and a low coefficient of thermal expansion (CTE)--that make them prime candidates for many spacecraft applications. The effects of a thermal cycling environment on the dimensional stability and microstructural integrity of Gr/E composites were evaluated. Severe microcracking was found in several high-modulus fiber (HMS)-reinforced 350°F-cure epoxy resin systems after exposure to 25 thermal cycles between the temperature of liquid nitrogen (-320°F) and that of boiling water (+212°F). A hybrid system combining Thornel-300 (T-300) fabric and HMS tape exhibited fewer microcracks, with the fabric acting as a crack stopper. Of the material systems investigated, a 250°F-cure system, HMS/CE 339, was found to be the most resistant to microcracking. The effects of thermal cycling on the microyield strength (MYS) and CTE of several near-zero expansion Gr/E composites were also studied.
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 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis History-Dependent Thermomechanical Properties of Graphite/Aluminum Unidirectional Composites by : FW. Crossman
Download or read book History-Dependent Thermomechanical Properties of Graphite/Aluminum Unidirectional Composites written by FW. Crossman and published by . This book was released on 1982 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: A high-modulus graphite(VS0054)/aluminum(6061) unidirectional composite was tested to characterize its thermomechanical properties as influenced by the thermomechanical history. The experiments included (1) tension tests at four different temperatures under monotonically increasing load followed by unloading; (2) measurement of the cyclic thermal expansion in the longitudinal and transverse directions, conducted on annealed and T-6 heat-treated composite specimens; and (3) tests on the thermal expansion behavior of specimens simultaneously held at a constant transverse tensile stress during the thermal cycling. The tension test results show that the yield strength of the composite is greatly influenced by the residual stress, which may vary with the thermomechanical loading history. During thermal cycling the aluminum matrix of the annealed specimen undergoes elastic and plastic deformation owing to the thermal mismatch between the matrix and the fiber. This results in a characteristic cyclic nonlinear response during thermal cycling, as observed by the cyclic thermal expansion measurement.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781725555655 Total Pages :36 pages Book Rating :4.5/5 (556 download)
Book Synopsis Effects of Temperature, Thermal Exposure, and Fatigue on an Alumina/Aluminum Composite by : National Aeronautics and Space Administration (NASA)
Download or read book Effects of Temperature, Thermal Exposure, and Fatigue on an Alumina/Aluminum Composite written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-14 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation of the mechanical properties and microstructure of an aluminum matrix/polycrystalline alumina fiber composite material is discussed. The effects of fabrication, isothermal exposure (up to 10,000 hours at 590 K), thermal cycling (6000 cycles between 200 K and 590 K), fatigue (1,000,000 tension-tension cycles) were determined by mechanical testing and metallurgical analysis. The fabrication process severely degraded the fiber strength by reducing the alumina to a nonstoichiometric form and quenching in the resultant vacancies and stress fields. However, isothermal exposure, thermal cycling, and fatigue cycling all restored the fiber strength by enhancing vacancy annihilation. Comparison of the as-fabricated material with other aerospace materials shows that it is an attractive candidate for select applications. Long duration isothermal exposure weakened the matrix by overaging and through the diffusional loss of lithium to a surface reaction forming lithium carbonate. Thermal cycling initiated cracks in the matrix and fibers. Tension-tension fatigue cycling caused no apparent damage to the as-fabricated material but in fact, strengthened it to the rule-of-mixtures value. Fatigue cycling after thermal exposure did have a cumulative damage effect. Olsen, G. C. Langley Research Center NASA-TP-1795, L-14074 RTOP 506-53-23-01...
Download or read book NASA Technical Paper written by and published by . This book was released on 1986 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effects of Thermal Cycling on Boron-aluminum Composites by : James Laurence Wills
Download or read book The Effects of Thermal Cycling on Boron-aluminum Composites written by James Laurence Wills and published by . This book was released on 1972 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Thermal and Environmental Exposure on the Mechanical Properties of Graphite/polyimide Composites by : M. P. Hanson
Download or read book Effects of Thermal and Environmental Exposure on the Mechanical Properties of Graphite/polyimide Composites written by M. P. Hanson and published by . This book was released on 1971 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composites were exposed in circulating and static air environments up to 589 K for a maximum of 1000 hours. Composites of HT-S, HM-S, Thornel 50S, and Fortafil 5-Y fiber and a new addition type polyimide resin were laminated in a matched-die mold. Flexural strengths, flexural modulus, and interlaminar shear strengths were determined at 297, 533, and 598 K after various durations of exposure. Composite and fiber weight loss characteristics were determined by isothermal gravimetric analysis in air. Properties of composites exposed and tested at the environment temperatures were compared with those determined under short-term exposure. A new short beam interlaminar shear fixture is described. Environmental effects of long-term ambient temperature exposure on the elevated temperature mechanical properties of graphite/polyimide composites are presented.
Book Synopsis Review of Progress in Quantitative Nondestructive Evaluation by : Donald O. Thompson
Download or read book Review of Progress in Quantitative Nondestructive Evaluation written by Donald O. Thompson and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 1818 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this volume (parts 1 and 2) are contained the edited papers presented at the annual Review of Progress in Quantitative NDE held at the University of California, San Diego, August 1-6, 1982. This Review, possibly the most comprehensive annual symposium emphasizing both ongoing research and applications in quantitative NDE, was sponsored by the Center for Advanced NDE at the Ames Laboratory of the U. S. Department of Energy in cooperation with the Materials Laboratory of the Air Force Wright Aeronautical Laboratories and the Defense Advanced Research Projects Agency. Over 300 attendees representing various government agencies and the industrial and university communities participated in the technical presentations, poster sessions, and discussions. The symposium benefited from the insight of two keynote speak ers, Dr. Harris Burte of the Materials Laboratory, AFWAL, and Mr. Ward Rummel of the Martin Marietta Corporation, who presented complementary messages. Dr. Burte pointed out the need to identify "windows" to serve as guides for focusing NDE research. The "window" concept may be thought of as an opportunity for the application of NDE technology to an important problem and, through this application, to identify knowledge gaps which must be filled by generic research. This concept simultaneously provides a mechanism for the solution of a direct ap plication problem and a set of strong guidelines for generic research directions. Mr. Rummel called attention to the value of "lessons learned" from var.
Book Synopsis Interfacial Effects on the Thermal and Mechanical Properties of Graphite/copper Composites by : Sandra Marie DeVincent
Download or read book Interfacial Effects on the Thermal and Mechanical Properties of Graphite/copper Composites written by Sandra Marie DeVincent and published by . This book was released on 1995 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis environmental effects on advanced composite materials by : Christian JL.
Download or read book environmental effects on advanced composite materials written by Christian JL. and published by ASTM International. This book was released on 1976 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis ALUMINUM - GRAPHITE COMPOSITES. by : Roger T. Pepper
Download or read book ALUMINUM - GRAPHITE COMPOSITES. written by Roger T. Pepper and published by . This book was released on 1970 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Room temperature uniaxial tensile tests have shown that composites of eutectic aluminum - silicon alloy and Thornel 50 graphite fibers have strengths greater than a theoretical value that was calculated on the basis of the law of mixtures. At 28 vol % fibers, the average uniaxial tensile strength was found to be 106,000 psi, and several values between 130,000 and 144,000 psi were obtained. The modes of fracture in the composites have been studied by the microexamination of polished surfaces and fractures of tested specimens. Specimens of the composite have been thermally cycled between -193C and +20C and -193C and +500C 20 times. Tensile tests and microexamination of the thermally cycled specimens show that thermal cycling does not degrade the tensile properties of the composites or change their microstructure. (Author).
Book Synopsis The Effects of Thermal Exposure on Graphite/aluminum Composites by : Martha E. Meaney
Download or read book The Effects of Thermal Exposure on Graphite/aluminum Composites written by Martha E. Meaney and published by . This book was released on 1987 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
