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  • Chemistry  (41,324)
  • STRUCTURAL MECHANICS  (1,910)
  • 1985-1989  (43,234)
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Keywords
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Year
  • 11
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    Station keeping of geostationary satellites by electric propulsion (1985)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: As various types of perturbations tend to drive a geostationary satellite away from its prescribed position, occasional orbit corrections have to be carried out by means of a suitable propulsion system. In future geostationary missions, low thrust electric propulsion is likely to be applied for station keeping because of considerable mass savings. In this paper a station keeping strategy for electric propulsion systems is developed. Both the unconstrained case and the case where thrust operation constraints are present are considered and tested by computer simulation of a realistic example.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-77820 , NAS 1.15:77820 , DGLR-PAPER-80-009 , Walter-Hohmann Symp. uber Raumflugmech.,; Mar 12, 1980 - Mar 13, 1980; Cologne; Germany
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 12
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    Structural Analysis Methods Development for Turbine Hot Section Components (1988)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: The structural analysis technologies and activities of the NASA Lewis Research Center's gas turbine engine Hot Section Technology (HOST) program are summarized. The technologies synergistically developed and validated include: time-varying thermal/mechanical load models; component-specific automated geometric modeling and solution strategy capabilities; advanced inelastic analysis methods; inelastic constitutive models; high-temperature experimental techniques and experiments; and nonlinear structural analysis codes. Features of the program that incorporate the new technologies and their application to hot section component analysis and design are described. Improved and, in some cases, first-time 3-D nonlinear structural analyses of hot section components of isotropic and anisotropic nickel-base superalloys are presented.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-100298 , E-3926 , NAS 1.15:100298
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 13
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    The 58th Shock and Vibration Symposium (1988)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: Dynamic analysis, dynamic testing, space shuttle main engine vibration, isolation and damping and analytical methods are among the topics discussed.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CP-2488-VOL-2 , M-572-VOL-2 , NAS 1.55:2488-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 14
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    The Shock and Vibration Bulletin. Part 1: Welcome, Keynote Address, Invited Papers, Nondevelopment Items Workshop and Pyrotechnic Shock Workshop (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: The proceedings of the 57th Shock and Vibration Symposium are presented. In part 1 is presented the welcoming and the keynote address along with invited papers such as, Dynamic Testing - Seven Years Later. Papers from the Nondevelopment Items workshop such as, Guidelines for Qualifying Nondevelopment Equipment to Shock and Vibration, are presented. And from the Pyrotechnic Shock Workshop the paper entitled, Designing Electronics for Pyrotechnic Shock, is presented.
    Keywords: STRUCTURAL MECHANICS
    Type: AD-A186748 , SVIC-BULL-57-PT-1
    Format: text
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    NASA TECHNICAL REPORTS
  • 15
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    Elasticity Solution of an Adhesively Bonded Cover Plate of Various Geometries (1985)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: The plane strain of adhesively bonded structures consisting of two different isotropic adherends is considered. By expressing the x-y components of the displacements in terms of Fourier integrals and using the corresponding boundary and continuity conditions, the integral equations for the general problem are obtained and solved numerically by applying Gauss-Chebyshev integration scheme. The shear and the normal stresses in the adhesive are calculated for various geometries and material properties for a stiffened plate under uniaxial tension. Numerical results involving the stress intensity factors and the strain energy release rate are presented. The closed-form expressions for the Fredholm kernels are provided to obtain the solution for an arbitrary geometry and material properties. For the general geometry, the contribution of the normal stress is quite significant, while for symmetric geometries, the shear stress is dominant, the normal stress vanishes if the adherends are of the same material and the same thickness.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-177923 , NAS 1.26:177923
    Format: application/pdf
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  • 16
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    A loading system for creep testing under constant compressive stress (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: A critical analysis is made of layouts assuring constant stress under creep, pointing out the difficulties of using these layouts for compressive testing. A new mechanical system to maintain stress during creep testing is proposed. Constant stress is achieved by a definite motion of the load. The proposed system can be used in tensile or compressive testing. Practical measurements reveal that the stress constancy error is not greater than plus or minus 1.5 percent up to relative deformation of 30 percent.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TT-20119 , NAS 1.77:20119 , (ISSN 0023-432X)
    Format: text
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    NASA TECHNICAL REPORTS
  • 17
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    The 23rd Aerospace Mechanisms Symposium (1989)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: Technological areas covered include space lubrication, bearings, aerodynamic devices, spacecraft latches, deployment, positioning, and pointing. Devices for Space Station docking and manipulator and teleoperator mechanisms are also described.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CP-3032 , M-611 , NAS 1.55:3032 , May 03, 1989 - May 05, 1989; Huntsville, AL; United States
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    NASA TECHNICAL REPORTS
  • 18
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    Characterization of structural connections using free and forced response test data (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The accurate prediction of system dynamic response often has been limited by deficiencies in existing capabilities to characterize connections adequately. Connections between structural components often are complex mechanically, and difficult to accurately model analytically. Improved analytical models for connections are needed to improve system dynamic predictions. A procedure for identifying physical connection properties from free and forced response test data is developed, then verified utilizing a system having both a linear and nonlinear connection. Connection properties are computed in terms of physical parameters so that the physical characteristics of the connections can better be understood, in addition to providing improved input for the system model. The identification procedure is applicable to multi-degree of freedom systems, and does not require that the test data be measured directly at the connection locations.
    Keywords: STRUCTURAL MECHANICS
    Type: Biennial ASME Conference on Mechanical Vibration and Noise; Sept. 17-21, 1989; Montreal; Canada
    Format: text
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  • 19
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    Microstructural non-uniformity as related to unidirectional compression performance (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The compression performance of unidirectional composite laminates (UDCLs) is related not only to intrinsic or local strength, but also to a sample's ability to resist propagaton of initial damage. This paper introduces a simple shear lag model which is applied to a compression loaded UDCL with initial damage. Among the information obtained are axial overload and matrix layer shear strain factors in the neighborhood of the damage zone. These factors indicate that propagation may occur with relatively little initial damage and emphasize the need for a more complete understanding of compression behavior than currently exists.
    Keywords: STRUCTURAL MECHANICS
    Type: International SAMPE Technical Conference; Sept. 25-28, 1989; Atlantic City, NJ; United States
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    NASA TECHNICAL REPORTS
  • 20
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    On modelling the residual strength of impact damaged, compression loaded laminates (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A methodology is presented to predict the residual compression strength of impact damaged composite laminates by considering the competing failure modes of local delamination buckling and compression failure. The minimum delamination buckling load and the location of the first local region to buckle are determined by a Rayleigh-Ritz analysis. The Rayleigh-Ritz analysis is formulated to account for the multiple delamination locations, Poisson's ratio mismatch between sublaminates and possible bending-stretching coupling behavior of the delaminated regions. The compression failure load is determined by a modified maximum strain criterion applied in the delaminated region. The minimum delamination buckling and compression failure loads may be compared to the global buckling load to predict initial failure. For non-catastrophic failures, failure sequences are predicted in an iterative manner. Analytical predictions for sequential failure modes and loads are shown to correlate well with experimental results. A comparative evaluation of various delamination buckling models and their accuracy in predicting experimental results is also presented.
    Keywords: STRUCTURAL MECHANICS
    Type: International SAMPE Technical Conference; Sept. 25-28, 1989; Atlantic City, NJ; United States
    Format: text
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