The Effects of Thermal Cycling on the Strength of Aluminum-Graphite Composites PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download The Effects of Thermal Cycling on the Strength of Aluminum-Graphite Composites PDF full book. Access full book title The Effects of Thermal Cycling on the Strength of Aluminum-Graphite Composites by William C Harrigan (Jr). Download full books in PDF and EPUB format.
Author: William C Harrigan (Jr)
Publisher:
ISBN:
Category :
Languages : en
Pages : 21
Get Book Here
Book Description
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).
Author: William C Harrigan (Jr)
Publisher:
ISBN:
Category :
Languages : en
Pages : 21
Get Book Here
Book Description
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).
Author: Gregory A. Dries
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 36
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 70
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 36
Get Book Here
Book Description
Author: Roger T. Pepper
Publisher:
ISBN:
Category : Fibrous composites
Languages : en
Pages : 34
Get Book Here
Book Description
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).
Author: JL. Camahort
Publisher:
ISBN:
Category : Coefficient of thermal expansion
Languages : en
Pages : 13
Get Book Here
Book Description
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.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 652
Get Book Here
Book Description
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.
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781725555655
Category :
Languages : en
Pages : 36
Get Book Here
Book Description
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...
Author: FW. Crossman
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 22
Get Book Here
Book Description
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:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 36
Get Book Here
Book Description
