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  • STRUCTURAL MECHANICS  (252)
  • 1970-1974  (252)
  • 1974  (252)
  • 1
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    Graphic arts techniques and equipment: A compilation (1974)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Technology utilization of NASA sponsored projects involving graphic arts techniques and equipment is discussed. The subjects considered are: (1) modification to graphics tools, (1) new graphics tools, (3) visual aids for graphics, and (4) graphic arts shop hints. Photographs and diagrams are included to support the written material.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-SP-5919(02)
    Format: application/pdf
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  • 2
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    Arbitrarily Curved and Twisted Space Beams (1974)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: A derivation of the equations which govern the deformation of an arbitrarily curved and twisted space beam is presented. These equations differ from those of the classical theory in that (1) extensional effects are included; (2) the strain-displacement relations are derived; and (3) the expressions for the stress resultants are developed from the strain displacement relations. It is shown that the torsional stress resultant obtained by the classical approach is basically incorrect except when the cross-section is circular. The governing equations are given in the form of first-order differential equations. A numerical algorithm is given for obtaining the natural vibration characteristics and example problems are presented.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-X-72185
    Format: application/pdf
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  • 3
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    Buckling analysis for anisotropic laminated plates under combined inplane loads (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The buckling analysis presented considers rectangular flat or curved general laminates subjected to combined inplane normal and shear loads. Linear theory is used in the analysis. All prebuckling deformations and any initial imperfections are ignored. The analysis method can be readily extended to longitudinally stiffened structures subjected to combined inplane normal and shear loads.
    Keywords: STRUCTURAL MECHANICS
    Type: IAF PAPER 74-038
    Format: text
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  • 4
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    Application of variational and Galerkin equations to linear and nonlinear finite element analysis (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The paper discusses the application of the variational equation to nonlinear finite element analysis. The problem of beam vibration with large deflection is considered. The variational equation is shown to be flexible in both the solution of a general problem and in the finite element formulation. Difficulties are shown to arise when Galerkin's equations are used in the consideration of the finite element formulation of two-dimensional linear elasticity and of the linear classical beam.
    Keywords: STRUCTURAL MECHANICS
    Type: IAF PAPER 74-026
    Format: text
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  • 5
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    Stress intensity factors for deep cracks emanating from the corner formed by a hole intersecting a plate surface (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: A technique consisting of a marriage between stress freezing photoelasticity and a numerical method was used to obtain stress intensity factors for natural cracks emanating from the corner at which a hole intersects a plate surface. Geometrics studied were: crack depth to thickness ratios of approximately 0.2, 0.5, and 0.75; crack depth to crack length ratios of approximately 1.0 to 2.0. All final crack geometries were grown under monotonic loading and growth was not self similar with most of the growth occurring through the thickness under remote extension. Stress intensity plate surface K sub s factors were determined at the intersection of the flaw border with the plate surface K sub s and with the edge of the hole K sub h. Results showed that for the relatively shallow flaws K sub h approximately equal to 1.5 K sub s, for the moderately deep flaws K sub h approximately equal to K sub s, and for the deep flaws K sub h approximately equal to 0.5 K sub s, revealing a severe sensitivity of K to flaw geometry.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-136930 , VPI-E-74-1
    Format: application/pdf
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  • 6
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    A procedure for verifying the structural integrity of an existing pressurized wind tunnel (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The present work describes the approach employed in verifying the structural integrity at maximum operating pressure of a low turbulence pressurized wind tunnel built in 1939-1940. The approach utilized existing ASME Code guidelines and fracture mechanics techniques in combination with the latest nondestructive examination methods to validate the desired life of the facility while minimizing reconstruction or major modifications. Detailed stress analyses using a finite element computer program and a numerical integration program were performed on critical areas of the tunnel. Critical vessel areas were evaluated for remaining fatigue life. Fracture mechanics analyses of the shell were performed at various regions, and critical flaw sizes at each location were determined. Analysis of the test data permitted the remaining useful life of the tunnel to be estimated at 8 to 10 years.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME PAPER 74-MAT-12 , Pressure Vessels and Piping Conference; Jun 24, 1974 - Jun 28, 1974; Miami Beach, FL
    Format: text
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  • 7
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    Investigation of pyrotechnic shock (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Review of comparative pyrotechnic shock outputs of various electro-explosive release devices that have been obtained in tests of an instrumented spacecraft structure. This research uses pyrotechnic shock spectra levels as an indicator of shock environment severity in support of a program of pyrotechnic device analysis and redesign intended to reduce shock generation.
    Keywords: STRUCTURAL MECHANICS
    Type: International Instrumentation Symposium; May 21, 1974 - May 23, 1974; Albuquerque, NM
    Format: text
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  • 8
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    Hingeless rotor theory and experiment on vibration reduction by periodic variation of conventional controls (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A preliminary evaluation is made of the concept of vibration reduction by properly selected oscillatory collective and cyclic control applications. The investigations are based on experimental frequency response data covering advance ratios from approximately 0.2 to 0.85. Because there was no instrumentation for the measurement of the pitch and roll vibrations, these values were obtained by properly adding up the flap-bending moments at 3.3 in. Any other quantity representing pitch/roll vibrations can be compensated for in the same fashion. The calculated control inputs required for vibration reduction stay within acceptable limits. For four of the five conditions tested they are smaller than the values used for the frequency response tests. As to be expected, the compensating controls greatly affect the blade loads, i.e., torsion, flap- and chordwise bending.
    Keywords: STRUCTURAL MECHANICS
    Type: Specialists Meeting on Rotorcraft Dynamics; Feb 13, 1974 - Feb 15, 1974; Moffett Field, CA
    Format: text
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  • 9
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    Skylab vibroacoustic test program (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Vibroacoustic testing was performed on the orbital workshop dynamic test article and the payload assembly, the two major elements of the Skylab payload. The testing was conducted on each of the Skylab elements separately in the reverberation chamber at the Johnson Space Center. The two test configurations were high fidelity flight article simulations. The testing was conducted in two phases; in the first phase, acoustic tests were performed at levels simulating the lift-off and atmospheric flight acoustic criteria. In the second phase, low frequency sinusoidal vibration tests were conducted to obtain modal response data. The objectives of the Skylab vibroacoustic test program were to: verify the vibration design and test criteria; qualify selected flight components to the vibroacoustic criteria; and verify analytical models used for dynamic load analyses. This paper describes the vibroacoustic testing and discusses the results.
    Keywords: STRUCTURAL MECHANICS
    Type: AAS PAPER 74-106 , Annual Meeting; Aug 20, 1974 - Aug 22, 1974; Los Angeles, CA
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  • 10
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    Estimation of material properties of a nonlinearly elastic bar (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A method of determining certain characteristic flexural rigidities and elastic properties of nonlinearly elastic materials is presented. An estimation method utilizing perturbation methods and a least squares fitting technique is used to solve the nonlinear differential equation derived from the moment curvature relation, subject to boundary values representing deflections of the bar at discrete points. Deflection data from numerical simulations of a nonlinearly elastic, prismatic bar are used to demonstrate the estimation method. Numerical experiments relating the accuracy of the identification to the number and accuracy of the boundary values are presented. Conclusions based on the numerical experiments are included.
    Keywords: STRUCTURAL MECHANICS
    Type: Southeastern Conference on Theoretical and Applied Mechanics; Mar 21, 1974 - Mar 22, 1974; Washington, DC
    Format: text
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