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Book Ten Year Ground Exposure of Composite Materials Used on the Bell Model 206l Helicopter Flight Service Program

Download or read book Ten Year Ground Exposure of Composite Materials Used on the Bell Model 206l Helicopter Flight Service Program written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-16 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Residual strength results are presented for four composite material systems that have been exposed for up to 10 years to the environment at five different locations on the North American continent. The exposure locations are near where the Bell Model 206L helicopters, which participated in a flight service program sponsored by NASA Langley Research Center and the U.S. Army, were flying in daily commercial service. The composite material systems are (1) Kevlar-49 fabric/F-185 epoxy; (2) Kevlar-49 fabric/LRF-277 epoxy; (3) Kevlar-49 fabric/CE-306 epoxy; and (4) T-300 graphite/E-788 epoxy. Six replicates of each material were removed and tested after 1, 3, 5, 7, and 10 years of exposure. The average baseline strength was determined from testing six as-fabricated specimens. More than 1700 specimens have been tested. All specimens that were tested to determine their strength were painted with a polyurethane paint. Each set of specimens also included an unpainted panel for observing the weathering effects on the composite materials. A statistically based procedure has been used to determine the strength value above which at least 90 percent of the population is expected to fall with a 95-percent confidence level. The computed compression strengths are 80 to 90 percent of the baseline (no-exposure) strengths. The resulting compression strengths are approximately 8 percent below the population mean strengths. The computed short-beam-shear strengths are 83 to 92 percent of the baseline (no-exposure) strengths. The computed tension strength of all materials is 93 to 97 percent of the baseline (no-exposure) strengths. Baker, Donald J. Langley Research Center...

Book Five Year Ground Exposure of Composite Materials Used on the Bell Model 206l Flight Service Evaluation

Download or read book Five Year Ground Exposure of Composite Materials Used on the Bell Model 206l Flight Service Evaluation written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-06 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: Part of the results of a U.S. Army/NASA-Langley sponsored research program to establish the long term-term effects of realistic ground based exposure on advanced composite materials is presented. Residual strengths and moisture absorption as a function of exposure time and exposure location are reported for four different composite material systems that were exposed for five years on the North American Continent. Baker, Donald J. Langley Research Center...

Book Monthly Catalogue United States Public Documents

Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1995 with total page 1994 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Scientific and Technical Aerospace Reports

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Flight Service Evaluation of Composite Components on Bell 206L and Sikorsky S 76 Helicopters

Download or read book Flight Service Evaluation of Composite Components on Bell 206L and Sikorsky S 76 Helicopters written by Donald J. Baker and published by . This book was released on 1983 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress on two programs to evaluate composite structural components in flight service on commercial helicopters is described. Thirty-six ship sets of composite components that include the litter door, baggage door, forward fairing, and vertical fin have been installed on Bell Model 206L helicopters that are operating in widely different climatic areas. Four horizontal stabilizers and ten tail rotor spars that are production components on the S-76 helicopter will be tested after prescribed periods of service to determine the effects of the operating environment on their performance. Concurrent with the flight evaluation, specimens from materials used to fabricate the components are being exposed in ground racks and tested at specified intervals to determine the effects of outdoor environments. Results achieved from 14,000 hours of accumulated service on the 206L components, tests on a S-76 horizontal stabilizer after 1600 hours of service, tests on a S-76 tail rotor spar after 2300 hours service, and two years of ground based exposure of material coupons are reported. (Author).

Book NASA Technical Memorandum

Download or read book NASA Technical Memorandum written by and published by . This book was released on 1990 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Ground Exposure of Composite Materials for Helicopters

Download or read book Ground Exposure of Composite Materials for Helicopters written by and published by . This book was released on 1984 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Reference Book for Composites Technology

Download or read book Reference Book for Composites Technology written by Stuart M. Lee and published by CRC Press. This book was released on 1989-05-13 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: The eleven contributions comprising the first volume address topics that include the history of composites, epoxy resins, fiber reinforced glasses and glass ceramics for high performance applications, aramid fiber reinforcements (specifically, Vniivlon/Polyamidobenzimidazole the USSR's aramid fiber-

Book The Utilization of Advanced Composites in Military Aircraft

Download or read book The Utilization of Advanced Composites in Military Aircraft written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Structures and Materials Panel. Meeting and published by . This book was released on 1992 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book NASA Langley Scientific and Technical Information Output 1994 Volume 1

Download or read book NASA Langley Scientific and Technical Information Output 1994 Volume 1 written by and published by . This book was released on 1995 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Evaluation of Composite Components on the Bell 206L and Sikorsky S 76 Helicopters

Download or read book Evaluation of Composite Components on the Bell 206L and Sikorsky S 76 Helicopters written by Donald J. Baker and published by . This book was released on 1990 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Journal of the American Helicopter Society

Download or read book Journal of the American Helicopter Society written by and published by . This book was released on 1993 with total page 1112 pages. Available in PDF, EPUB and Kindle. Book excerpt: