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  • STRUCTURAL MECHANICS  (325)
  • 1970-1974  (325)
  • 1973  (325)
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  • 1970-1974  (325)
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  • 1
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    Research and technology advisory committee on materials and structures (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-80351
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Computer programs: Mechanical and structural design criteria: A compilation (1973)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: Computerized design criteria for turbomachinery and the constraints imposed by very high rotational fields are presented along with a variety of computerized design criteria of interest to structural designers.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-SP-5966(01)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Research and Technology Advisory Committee on Materials and Structures: Report of meeting, February 1973 (1973)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The proceedings of a conference on Materials and Structures is presented. The subjects discussed are: (1) basic materials research: (2) fracture control: (3) aerospace vehicle dynamics and control: and (4) tramp elements in fuels and alloys.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-X-69227 , Feb 06, 1973 - Feb 07, 1973; Hampton, VA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Numerical integration of shell equations using the field method. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The 'field method' for the numerical solution of even-order linear boundary-value problems in ordinary differential equations is formulated. This method converts the boundary-value problem into two successive initial-value problems, which may be solved by standard forward integration techniques. The method has been implemented in a computer program to calculate the static response of ring-stiffened branched shells of revolution to asymmetric loads. For such problems the field method eliminates the well-known numerical problem of 'long subintervals' and also executes operations significantly faster than other numerical integration methods.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME PAPER 73-APMW-27 , Applied Mechanics Western Conference; Sept. 17-19, 1973; Menlo Park, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    The elliptical crack subjected to nonuniform shear loading. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The equations of elasticity are solved for the problem of a flat elliptical crack which has nonuniform shear stresses applied to its surfaces. The shear stresses are prescribed independently in two directions on the crack surface and are expressed in the form of a third-degree polynomial. Mode-two and mode-three stress-intensity factors are presented in analytical and graphical form as functions of position along the crack border.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME PAPER 73-APMW-42 , Applied Mechanics Western Conference; Sept. 17-19, 1973; Menlo Park, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    An integral equation approach to the semi-infinite strip problem. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A semi-infinite strip held rigidly on its short end is considered. Loads in the strip at infinity (far away from the fixed end) are prescribed. The integral transform technique is used to provide an exact formulation of the problem in terms of a singular integral equation. The stress singularity at the strip corner is obtained from the singular integral equation, which is then solved numerically. Stresses along the rigid end are determined, and the effect of the material properties on the stress-intensity factor is presented. The method can also be applied to the problem of a laminate composite with a flat inclusion normal to the interfaces.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME PAPER 73-APMW-5 , Applied Mechanics Western Conference; Sept. 17-19, 1973; Menlo Park, CA
    Format: text
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  • 7
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    Sinusoidal response of composite-material plates with material damping. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A general forced-vibration analysis is presented for laminated anisotropic rectangular plates including material damping. The theory used is the laminated version of the Mindlin plate theory and includes thickness-shear flexibility and rotatory and coupling inertia. A solution is obtained by the Rayleigh-Ritz method, extended to include the energy dissipated and the work done by the excitation. The analysis is applied to prediction of the resonant frequencies and associated nodal patterns and damping ratios of the first five modes for a series of rectangular plates with free edges. The plates considered consist of unidirectional boron-fiber/epoxy composite material with respective fiber orientations of 0, 10, 30, 45, 60, and 90 deg.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME PAPER 73-DET-120 , Design Engineering Technical Conference; Sept. 9-12, 1973; Cincinnati, OH
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    The dynamic behavior of articulated pipes conveying fluid with periodic flow rate. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The plane motion of two rigid, straight articulated pipes conveying fluid is examined. In contrast to previous work, the flow rate is not taken as constant, but is allowed to have small periodic oscillations about a mean value, as would be expected in a pump-driven system. It is shown that in the presence of such disturbances, both parametric and combination resonances are possible. When the system can also admit loss of stability by static buckling or by flutter, it is found that the presence of small periodic disturbances constitutes a destabilizing effect. Floquet theory and converging infinite determinant expansions are used to illustrate a basic difference between systems which lose stability by divergence and those that lose stability by flutter. An algebraic criterion is obtained for the minimum amplitude of flow-rate oscillation required for the system to be affected by the presence of small disturbances.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME PAPER 73-APMW-32 , Applied Mechanics Western Conference; Sept. 17-19, 1973; Menlo Park, CA
    Format: text
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  • 9
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    The effects of shot-peening residual stresses on the fracture and crack growth properties of D6AC steel (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The fracture strength and cyclic crack-growth properties of surface-flawed, shot-peened D6AC steel plate were investigated. For short crack lengths (up to 1.5mm) simple linear elastic fracture mechanics - based only on applied loading - did not predict the fracture strengths. Also, Paris' Law for cyclic crack growth did not correlate the crack-growth behavior. To investigate the effect of shot-peening, additional fracture and crack-growth tests were performed on material which was precompressed to remove the residual stresses left by the shot-peening. Both tests and analysis show that the shot-peening residual stresses influence the fracture and crack-growth properties of the material. The analytical method of compensating for residual stresses and the fracture and cyclic crack-growth test results and predictions are presented.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-X-71943 , ASTM 7th Natl. Symp. on Fracture Mech.; Aug 27, 1973 - Aug 29, 1973; College Park, MD; United States
    Format: application/pdf
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  • 10
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    The three dimensional motion and stability of a rotating space station-cable - Counterweight configuration (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The three dimensional equations of motion for a cable connected space station - counterweight system are developed using a Lagrangian formulation. The system model employed allows for cable and end body damping and restoring effects. The equations are then linearized about the equilibrium motion and nondimensionalized. To first degree, the out-of-plane equations uncouple from the in-plane equations. Therefore, the characteristic polynomials for the in-plane and out-of-plane equations are developed and treated separately. From the general in-plane characteristic equation, necessary conditions for stability are obtained. The Routh-Hurwitz necessary and sufficient conditions for stability are derived for the general out-of-plane characteristic equation. Special cases of the in-plane and out-of-plane equations (such as identical end masses, and when the cable is attached to the centers of mass of the two end bodies) are then examined for stability criteria.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-137146
    Format: application/pdf
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