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  • STRUCTURAL MECHANICS  (7)
  • AIR TRANSPORTATION AND SAFETY  (6)
  • Agricultural Technology  (1)
  • D. fracture  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Journal of Physics and Chemistry of Solids 55 (1994), S. 1165-1168 
    ISSN: 0022-3697
    Schlagwort(e): D. fracture ; D. mechanical properties
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    facet.materialart.
    Unbekannt
    Oxford University Press
    Publikationsdatum: 2015-04-18
    Beschreibung: The prospects for plant variety protection to deliver improved varieties of self-pollinating crops is assessed using the experience of the Australian wheat breeding sector as a natural experiment. The analysis is based on detailed new data on the agronomic performance of all wheat varieties released by Australian breeders between 1976 and 2011. The results indicate that plant variety protection, and associated reforms, led to a substantial fall in breeder output. Qualitative evidence indicates that this was caused by a combination of fewer research spillovers, lower release standards, and a possible fall in total investment in breeding.
    Schlagwort(e): O34 - Intellectual Property Rights, Q16 - R&D ; Agricultural Technology ; Agricultural Extension Services, Q18 - Agricultural Policy ; Food Policy
    Print ISSN: 0002-9092
    Digitale ISSN: 1467-8276
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Wirtschaftswissenschaften
    Publiziert von Oxford University Press
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Publikationsdatum: 2011-08-19
    Beschreibung: A remotely piloted air-to-ground crash test of a full-scale transport aircraft was conducted for the first time for two purposes: (1) to demonstrate performance of an antimisting fuel additive in suppressing fire in a crash environment, and (2) to obtain structural dynamics data under crash conditions for comparison with analytical predictions. The test, called the Controlled Impact Demonstration (CID), was sponsored by FAA and NASA with cooperation of industry, the Department of Defense, and the British and French governments. The test aircraft was a Boeing 720 jet transport. The aircraft impacted a dry lakebed at Edwards Air Force Base, CA. The purpose of this paper is to discuss the structural aspects of the CID. The fuselage section tests and the CID itself are described. Structural response data from these tests are presented and discussed. Nonlinear analytical modeling efforts are described, and comparisons between analytical results and experimental results are presented.
    Schlagwort(e): AIR TRANSPORTATION AND SAFETY
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Publikationsdatum: 2011-08-16
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: International Journal of Solids and Structures; 12; 8, 19; 1976
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    facet.materialart.
    Unbekannt
    In:  CASI
    Publikationsdatum: 2016-06-07
    Beschreibung: The purpose of the crash safety program is to support development of the technology to define and demonstrate new structural concepts for improved crash safety and occupant survivability in general aviation aircraft. The program involves three basic areas of research: full-scale crash simulation testing, nonlinear structural analyses necessary to predict failure modes and collapse mechanisms of the vehicle, and evaluation of energy absorption concepts for specific component design. Both analytical and experimental methods are being used to develop expertise in these areas. Analyses include both simplified procedures for estimating energy absorption capabilities and more complex computer programs for analysis of general airframe response. Full-scale tests of typical structures as well as tests on structural components are being used to verify the analyses and to demonstrate improved design concepts.
    Schlagwort(e): AIR TRANSPORTATION AND SAFETY
    Materialart: Aircraft Safety and Operating Problems; p 369-390
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Publikationsdatum: 2016-06-07
    Beschreibung: The program involves controlled full scale crash testing, nonlinear structural analyses to predict large deflection elastoplastic response, and load attenuating concepts for use in improved seat and subfloor structure. Both analytical and experimental methods are used to develop expertise in these areas. Analyses include simplified procedures for estimating energy dissipating capabilities and comprehensive computerized procedures for predicting airframe response. These analyses are developed to provide designers with methods for predicting accelerations, loads, and displacements on collapsing structure. Tests on typical full scale aircraft and on full and subscale structural components are performed to verify the analyses and to demonstrate load attenuating concepts. A special apparatus was built to test emergency locator transmitters when attached to representative aircraft structure. The apparatus is shown to provide a good simulation of the longitudinal crash pulse observed in full scale aircraft crash tests.
    Schlagwort(e): AIR TRANSPORTATION AND SAFETY
    Materialart: The 1980 Aircraft Safety and Operating Probl., Pt. 2; p 511-540
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Publikationsdatum: 2019-05-30
    Beschreibung: Viscoplastic flow theory in hypervelocity projectile perforation analyses of thin plates
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-TM-X-54874
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Publikationsdatum: 2019-05-23
    Beschreibung: Hypervelocity perforation of viscoplastic solid - effects of target material yield strength
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-TR-R-221
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    facet.materialart.
    Unbekannt
    In:  CASI
    Publikationsdatum: 2019-06-28
    Beschreibung: Ten years of structural crash dynamics research activities conducted on general aviation aircraft by the National Aeronautics and Space Administration (NASA) are described. Thirty-two full-scale crash tests were performed at Langley Research Center, and pertinent data on airframe and seat behavior were obtained. Concurrent with the experimental program, analytical methods were developed to help predict structural behavior during impact. The effects of flight parameters at impact on cabin deceleration pulses at the seat/occupant interface, experimental and analytical correlation of data on load-limiting subfloor and seat configurations, airplane section test results for computer modeling validation, and data from emergency-locator-transmitter (ELT) investigations to determine probable cause of false alarms and nonactivations are assessed. Computer programs which provide designers with analytical methods for predicting accelerations, velocities, and displacements of collapsing structures are also discussed.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-TP-2298 , L-15757 , NAS 1.60:2298
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Publikationsdatum: 2019-06-27
    Beschreibung: Plastic response of circular uniform plate to axisymmetric impulse load of Gaussian distribution
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-TR-R-279
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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