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  • 2000-2004  (6)
  • 1
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    An Assessment of the State-of-the-Art in the Design and Manufacturing of Large Composite Structures for Aerospace Vehicles (2001)
    In:  CASI
    Details
    Publication Date: 2018-06-02
    Description: An assessment of the State-of-the-Art in the design and manufacturing of large composite structures has been conducted. The focus of the assessment is large structural components in commercial and military aircraft. Applications of composites are reviewed for commercial transport aircraft, general aviation aircraft, rotorcraft, and military aircraft.
    Keywords: Structural Mechanics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Advances in Structural Integrity Analysis Methods for Aging Metallic Airframe Structures with Local Damage (2003)
    In:  CASI
    Details
    Publication Date: 2018-06-27
    Description: Analysis methodologies for predicting fatigue-crack growth from rivet holes in panels subjected to cyclic loads and for predicting the residual strength of aluminum fuselage structures with cracks and subjected to combined internal pressure and mechanical loads are described. The fatigue-crack growth analysis methodology is based on small-crack theory and a plasticity induced crack-closure model, and the effect of a corrosive environment on crack-growth rate is included. The residual strength analysis methodology is based on the critical crack-tip-opening-angle fracture criterion that characterizes the fracture behavior of a material of interest, and a geometric and material nonlinear finite element shell analysis code that performs the structural analysis of the fuselage structure of interest. The methodologies have been verified experimentally for structures ranging from laboratory coupons to full-scale structural components. Analytical and experimental results based on these methodologies are described and compared for laboratory coupons and flat panels, small-scale pressurized shells, and full-scale curved stiffened panels. The residual strength analysis methodology is sufficiently general to include the effects of multiple-site damage on structural behavior.
    Keywords: Aeronautics (General)
    Type: Ageing Mechanisms and Control: Specialists' Meeting on Life Management Techniques for Ageing Air Vehicles; 27-1 - 27-16; RTO-MP-079(II)
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    An Assessment of the State-of-the-Art in the Design and Manufacturing of Large Composite Structures for Aerospace Vehicles (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The results of an assessment of the state-of-the-art in the design and manufacturing of large composite structures are described. The focus of the assessment is on the use of polymeric matrix composite materials for large airframe structural components. such as those in commercial and military aircraft and space transportation vehicles. Applications of composite materials for large commercial transport aircraft, general aviation aircraft, rotorcraft, military aircraft. and unmanned rocket launch vehicles are reviewed. The results of the assessment of the state-of-the-art include a summary of lessons learned, examples of current practice, and an assessment of advanced technologies under development. The results of the assessment conclude with an evaluation of the future technology challenges associated with applications of composite materials to the primary structures of commercial transport aircraft and advanced space transportation vehicles.
    Keywords: Composite Materials
    Type: NASA/TM-2001-210844 , L-18070 , NAS 1.15:210844
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A Revolution in the Making: Advances in Materials That May Transform Future Exploration Infrastructures and Missions (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The NASA Strategic Plan identifies the long-term goal to provide safe and affordable space access, orbital transfer, and interplanetary transportation capabilities to enable research, human exploration, and the commercial development of space; and to conduct human and robotic missions to planets and other bodies in our solar system. Numerous scientific and engineering breakthroughs will be required to develop the technology necessary to achieve this goal. Critical technologies include advanced vehicle primary and secondary structure, radiation protection, propulsion and power systems, fuel storage, electronics and devices, sensors and science instruments, and medical diagnostics and treatment. Advanced materials with revolutionary new capabilities are an essential element of each of these technologies. This paper discusses those materials best suited for aerospace vehicle structure and highlights the enormous potential of one revolutionary new material, carbon nanotubes.
    Keywords: Composite Materials
    Type: AIAA Paper 2001-4679 , AIAA Space 2001 Conference and Exposition; Aug 28, 2001 - Aug 30, 2001; Albuquerque, NM; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    A Survey of Emerging Materials for Revolutionary Aerospace Vehicle Structures and Propulsion Systems (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The NASA Strategic Plan identifies the long-term goal of providing safe and affordable space access, orbital transfer, and interplanetary transportation capabilities to enable scientific research, human, and robotic exploration, and the commercial development of space. Numerous scientific and engineering breakthroughs will be required to develop the technology required to achieve this goal. Critical technologies include advanced vehicle primary and secondary structure, radiation protection, propulsion and power systems, fuel storage, electronics and devices, sensors and science instruments, and medical diagnostics and treatment. Advanced materials with revolutionary new capabilities are an essential element of each of these technologies. A survey of emerging materials with applications to aerospace vehicle structures and propulsion systems was conducted to assist in long-term Agency mission planning. The comprehensive survey identified materials already under development that could be available in 5 to 10 years and those that are still in the early research phase and may not be available for another 20 to 30 years. The survey includes typical properties, a description of the material and processing methods, the current development status, and the critical issues that must be overcome to achieve commercial viability.
    Keywords: Composite Materials
    Type: NASA/TM-2002-211664 , L-18188 , NAS 1.15:211664
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Advanced Durability and Damage Tolerance Design and Analysis Methods for Composite Structures: Lessons Learned from NASA Technology Development Programs (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: Aerospace vehicles are designed to be durable and damage tolerant. Durability is largely an economic life-cycle design consideration whereas damage tolerance directly addresses the structural airworthiness (safety) of the vehicle. However, both durability and damage tolerance design methodologies must address the deleterious effects of changes in material properties and the initiation and growth of microstructural damage that may occur during the service lifetime of the vehicle. Durability and damage tolerance design and certification requirements are addressed for commercial transport aircraft and NASA manned spacecraft systems. The state-of-the-art in advanced design and analysis methods is illustrated by discussing the results of several recently completed NASA technology development programs. These programs include the NASA Advanced Subsonic Technology Program demonstrating technologies for large transport aircraft and the X-33 hypersonic test vehicle demonstrating technologies for a single-stage-to-orbit space launch vehicle.
    Keywords: Mechanical Engineering
    Type: NASA/TM-2003-212420 , L-18297 , NAS 1.15:212420
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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