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  • 1
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    Technology integration box beam failure study (1992)
    In:  Other Sources
    Details
    Publication Date: 2013-08-29
    Description: Composite structures have the potential to be cost effective, structurally efficient primary aircraft structures. As part of the Advanced Composite Technology (ACT) program to exploit this potential for heavily loaded aircraft structures, the design and fabrication of the technology integration box beam (TIBB) was completed. The TIBB is an advanced composite prototype structure for the center wing section of the Lockheed C-130 aircraft. The TIBB was tested for downbending, upbending, torsion, and combined upbending and torsion load conditions to verify the design. The TIBB failed at 83 percent of design ultimate load for the combined upbending and torsion load condition. Current analytical and experimental results are described for a study of the mechanisms that led to the failure of the TIBB. Experimental results include load, strain, and deflection data. An analytical study was conducted of the TIBB structural response. Analytical results include strain and deflection results from a global analysis of the TIBB.
    Keywords: COMPOSITE MATERIALS
    Type: Second NASA Advanced Composites Technology Conference; p 99-111
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A parametric shell analysis of the shuttle 51-L SRB AFT field joint (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Following the Shuttle 51-L accident, an investigation was conducted to determine the cause of the failure. Investigators at the Langley Research Center focused attention on the structural behavior of the field joints with O-ring seals in the steel solid rocket booster (SRB) cases. The shell-of-revolution computer program BOSOR4 was used to model the aft field joint of the solid rocket booster case. The shell model consisted of the SRB wall and joint geometry present during the Shuttle 51-L flight. A parametric study of the joint was performed on the geometry, including joint clearances, contact between the joint components, and on the loads, induced and applied. In addition combinations of geometry and loads were evaluated. The analytical results from the parametric study showed that contact between the joint components was a primary contributor to allowing hot gases to blow by the O-rings. Based upon understanding the original joint behavior, various proposed joint modifications are shown and analyzed in order to provide additional insight and information. Finally, experimental results from a hydro-static pressurization of a test rocket booster case to study joint motion are presented and verified analytically.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-102748 , NAS 1.15:102748
    Format: application/pdf
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  • 3
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    Test of superplastically formed corrugated aluminum compression specimens with beaded webs (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Corrugated wall sections provide a highly efficient structure for carrying compressive loads in aircraft and spacecraft fuselages. The superplastic forming (SPF) process offers a means to produce complex shells and panels with corrugated wall shapes. A study was made to investigate the feasibility of superplastically forming 7475-T6 aluminum sheet into a corrugated wall configuration and to demonstrate the structural integrity of the construction by testing. The corrugated configuration selected has beaded web segments separating curved-cap segments. Eight test specimens were fabricated. Two specimens were simply a single sheet of aluminum superplastically formed to a beaded-web, curved-cap corrugation configuration. Six specimens were single-sheet corrugations modified by adhesive bonding additional sheet material to selectively reinforce the curved-cap portion of the corrugation. The specimens were tested to failure by crippling in end compression at room temperature.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-104119 , NAS 1.15:104119
    Format: application/pdf
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  • 4
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    An analytically designed subcomponent test to reproduce the failure of a composite wing box beam (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A Stiffener Runout Test Specimen (SRTS) has been analyzed and tested to verify the failure scenario for a large composite wingbox beam subcomponent. The SRTS was taken from an undamaged region of the subcomponent that was similar to the failure region of the boxbeam. Extensive analyses were performed to determine the proper load introduction and constraint conditions required for the SRTS test to simulate the response of the subcomponent. The present paper describes the analyses that led to the design of test fixtures that ensured that the response of the SRTS duplicated the response of the box beam. The results of the SRTS test are described and compared with the analytical predictions.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 93-1344 , In: AIAA(ASME)ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 34th and AIAA/ASME Adaptive Structures Forum, La Jolla, CA, Apr. 19-22, 1993, Technical Papers. Pt. 1 (A93-33876 1; p. 424-435.
    Format: text
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  • 5
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    User's manual for the Macintosh version of PASCO (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A user's manual for Macintosh PASCO is presented. Macintosh PASCO is an Apple Macintosh version of PASCO, an existing computer code for structural analysis and optimization of longitudinally stiffened composite panels. PASCO combines a rigorous buckling analysis program with a nonlinear mathematical optimization routine to minimize panel mass. Macintosh PASCO accepts the same input as mainframe versions of PASCO. As output, Macintosh PASCO produces a text file and mode shape plots in the form of Apple Macintosh PICT files. Only the user interface for Macintosh is discussed here.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-TM-104115 , NAS 1.15:104115
    Format: application/pdf
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  • 6
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    Superplastically Formed Titanium Hat-Stiffened Panels (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Recent advances in superplastic forming of some metals make it possible to fabricate new shapes. Superplastic forming enables design of structures using mass more efficiently. Parts having intersecting compound contour surfaces made; impossible to fabricate such parts by more conventional methods. Beaded hat-stiffened panel has higher critical buckling strain than conventional hat-stiffened panel.
    Keywords: FABRICATION TECHNOLOGY
    Type: LAR-13814 , NASA Tech Briefs (ISSN 0145-319X); 14; 1; P. 63
    Format: text
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  • 7
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    Preprocessor Program For Use With PASCO (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: MACPASCO is interactive, graphical preprocessor program designed to make use of Panel Analysis and Sizing Code, PASCO, (COSMIC program numbers LAR-13004, LAR-13164, and LAR-14799) faster, simpler, and less error-prone. Is Macintosh-based preprocessor program that includes graphical user interface (GUI) program to simplify specification of panel geometry, making modeling and analysis of panel designs more efficient and reducing potential for user input errors. Written in Macintosh Programmers Workbench 3.0, MPW Pascal 3.0, and MacAPP 2.0.
    Keywords: MECHANICS
    Type: LAR-14908 , NASA Tech Briefs (ISSN 0145-319X); 18; 3; P. 26
    Format: text
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  • 8
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    Program Helps Design Composite Panels (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Panel Analysis and Sizing Code (PASCO) computer program developed for buckling and vibration analysis and sizing of prismatic structures having arbitrary cross sections. Intended for analyzing and sizing stiffened panels made of laminated orthotropic materials, and of particular value in analyzing and sizing filamentary composite structures. Macintosh version of PASCO includes interactive, graphic preprocessor called MACPASCO. Main objective to make use of PASCO faster, simpler, and less error-prone. Includes graphical user interface (GUI). PASCO written in FORTRAN IV. MACPASCO written in Macintosh Programmers Workbench 3.0, MPW Pascal 3.0, and MacAPP 2.0.
    Keywords: MECHANICS
    Type: LAR-14799 , NASA Tech Briefs (ISSN 0145-319X); 18; 3; P. 24
    Format: text
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