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  • 1
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    Perturbation solution of a hyperbolic equation governing longitudinal wave propagation in certain nonuniform bars (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Longitudinal wave propagation in variable section bars, solving hyperbolic equation of motion by perturbation method
    Keywords: STRUCTURAL MECHANICS
    Type: ; YAL SOCIETY (
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Interactive design of large end rings on stiffened conical shells using composites (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Design study methods and results for a composite reinforced base ring for the conical aeroshell structure of the planetary lander vehicle for Project Viking, an unmanned mission to Mars, are presented. The aeroshell is a ring and stringer-stiffened conical shell structure having a half angle of 70 degrees with a large base ring mounted at the outer edge of the cone and a large pay-load ring in the interior with many smaller rings spaced along the inside shell surface. The purpose of the structure is to develop the aerodynamic drag required to decelerate the lander in the Mars atmosphere to facilitiate a soft landing. The design of a shell structure of this complexity requires the use of the latest technology available in a large general-purpose shell buckling program. The large general-purpose non-linear shell buckling program (BOSOR 2) which was used for this purpose is described.
    Keywords: STRUCTURAL MECHANICS
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  • 3
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    Buckling tests of two 4.6-meter-diameter, magnesium ring-stiffened conical shells loaded under external pressure (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Two ring-stiffened magnesium conical shells with a 120 deg apex angle and a 4.6-meter diameter were loaded to failure by a uniform external pressure. The cones differed from one another only in the number of internal stiffening rings. Test specimen details, test procedure, and test results are discussed. Both buckling and prebuckling data are compared with appropriate theoretical predictions. Measured strains in skin and rings agreed well with theoretical predictions. Extensive imperfection measurements were made and reported on both cones in the as fabricated condition.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TN-D-7303 , L-8835
    Format: application/pdf
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  • 4
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    A recurrence matrix method for the analysis of longitudinal and torsional vibrations in non-uniform multibranch beams with variable boundary conditions (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An approximate method for calculating the longitudinal and torsional natural frequencies and associated modal data of a beamlike, variable cross section multibranch structure is presented. The procedure described is the numerical integration of the first order differential equations that characterize the beam element in longitudinal motion and that satisfy the appropriate boundary conditions.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-X-71973
    Format: application/pdf
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  • 5
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    Compressive instability and strength of uniaxial filament-reinforced epoxy tubes (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Column buckling, local buckling, and crushing strengths of uniaxial filament-reinforced epoxy tubes
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TN-D-5697 , L-6905
    Format: application/pdf
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  • 6
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    Minimum-weight designs for hat-stiffened composite panels under uniaxial compression (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Optimum hat-stiffened compression panel designs are determined by a structural synthesis technique. The effects of simplifying assumptions made in the buckling analysis for the optimization program are investigated by a linked plate element program. Optimization results for hat-stiffened graphite-epoxy panels show a 50-percent weight savings over optimized aluminum panels. Composite panels are shown to possess a variety of proportions at nearly constant weight.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TN-D-7779 , L-9739
    Format: application/pdf
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  • 7
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    A computer program for plotting stress-strain data from compression, tension, and torsion tests of materials (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A computer program for plotting stress-strain curves obtained from compression and tension tests on rectangular (flat) specimens and circular-cross-section specimens (rods and tubes) and both stress-strain and torque-twist curves obtained from torsion tests on tubes is presented in detail. The program is written in FORTRAN 4 language for the Control Data 6000 series digital computer with the SCOPE 3.0 operating system and requires approximately 110000 octal locations of core storage. The program has the capability of plotting individual strain-gage outputs and/or the average output of several strain gages and the capability of computing the slope of a straight line which provides a least-squares fit to a specified section of the plotted curve. In addition, the program can compute the slope of the stress-strain curve at any point along the curve. The computer program input and output for three sample problems are presented.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-X-3091 , L-9384
    Format: application/pdf
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  • 8
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    Performance of statistical energy analysis (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Statistical energy analysis (SEA) methods have been developed for high frequency modal analyses on random vibration environments. These SEA methods are evaluated by comparing analytical predictions to test results. Simple test methods are developed for establishing SEA parameter values. Techniques are presented, based on the comparison of the predictions with test values, for estimating SEA accuracy as a function of frequency for a general structure.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-124322 , MDC-G4741
    Format: application/pdf
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  • 9
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    Evaluation of acoustic emission technique for crack growth measurement in aeronautical structures (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An investigation has been conducted concerning the possibility to use the acoustic emission technique for the measurement of fatigue crack growth in aluminum alloy specimens. Two types of aluminum alloys were tested in the investigation. It was found that the acoustic emission technique provides a reliable indication of changes in the crack dimensions over relatively short periods of time. The level of acoustic activity serves as an indicator of the size of the cracks.
    Keywords: STRUCTURAL MECHANICS
    Type: International Instrumentation Symposium; May 21, 1974 - May 23, 1974; Albuquerque, NM
    Format: text
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  • 10
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    Reinforcement of metals with advanced filamentary composites (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper reviews some recent applications of the concept of reinforcing metal structures with advanced filamentary composites, and presents some results of an experimental investigation of the tensile behavior of aluminum and titanium reinforced with unidirectional boron/epoxy. Results are given for tubular and flat specimens, bonded at either room temperature or elevated temperature. The composite reinforced metals showed increased stiffness over the all-metal counterpart, as predicted by the rule of mixtures, and the results were independent of specimen geometry. The tensile strength of the born/epoxy reinforced metals is shown to be a function of the geometry of the test specimen and the method of bonding the composite to the metal.
    Keywords: STRUCTURAL MECHANICS
    Type: Conference on Composite materials: Testing and design; Mar 21, 1973 - Mar 22, 1973; Williamsburg, VA
    Format: text
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