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  • 1
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    A CALCULATIONAL PROCEDURE FOR ESTIMATING SPACE RADIATION EXPOSURE DURING LUNAR MISSIONS (1962)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Estimation of space radiation exposure during lunar mission - spacecraft shielding
    Keywords: STRUCTURAL MECHANICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Comparison of measured and calculated dynamic loads for the Mod-2 2.5 mW wind turbine system (1995)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Boeing Company, under contract to the Electric Power Research Institute (EPRI), has completed a test program on the Mod-2 wind turbines at Goodnoe Hills, Washington. The objectives were to update fatigue load spectra, discern site and machine differences, measure vortex generator effects, and to evaluate rotational sampling techniques. This paper shows the test setup and loads instrumentation, loads data comparisons and test/analysis correlations. Test data are correlated with DYLOSAT predictions using both the NASA interim turbulence model and rotationally sampled winds as inputs. The latter is demonstrated to have the potential to improve the test/analysis correlations. The paper concludes with an assessment of the importance of vortex generators, site dependence, and machine differences on fatigue loads. The adequacy of prediction techniques used are evaluated and recommendations are made for improvements to the methodology.
    Keywords: STRUCTURAL MECHANICS
    Type: DASCON Engineering, Collected Papers on Wind Turbine Technology; p 139-152
    Format: application/pdf
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  • 3
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    Theoretical analysis of HVAC duct hanger systems (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Several methods are presented which, together, may be used in the analysis of duct hanger systems over a wide range of frequencies. The finite element method (FEM) and component mode synthesis (CMS) method are used for low- to mid-frequency range computations and have been shown to yield reasonably close results. The statistical energy analysis (SEA) method yields predictions which agree with the CMS results for the 800 to 1000 Hz range provided that a sufficient number of modes participate. The CMS approach has been shown to yield valuable insight into the mid-frequency range of the analysis. It has been demonstrated that it is possible to conduct an analysis of a duct/hanger system in a cost-effective way for a wide frequency range, using several methods which overlap for several frequency bands.
    Keywords: STRUCTURAL MECHANICS
    Type: COSMIC, 15th NASTRAN (R) Users' Colloquium; p 222-249
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    NASA TECHNICAL REPORTS
  • 4
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    Bending strength of large thin-walled pressure- stabilized cylinder beyond onset of compressive skin wrinkling. (1966)
    In:  Other Sources
    Details
    Publication Date: 2018-12-01
    Description: Ultimate bending moment capability of thin walled pressure stabilized cylinder with typical axial loads demonstrated to be 50 percent greater than bending moment at which compressive wrinkling occurs
    Keywords: STRUCTURAL MECHANICS
    Format: text
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  • 5
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    Finite element analysis of partly wrinkled membranes (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The development of a nonlinear numerical algorithm for the analysis of stresses and displacements in partly wrinkled flat membranes, and its implementation on the SAP VII finite-element code are described. A comparison of numerical results with exact solutions of two benchmark problems reveals excellent agreement, with good convergence of the required iterative procedure. An exact solution of a problem involving axisymmetric deformations of a partly wrinkled shallow curved membrane is also reported.
    Keywords: STRUCTURAL MECHANICS
    Type: Computers and Structures (ISSN 0045-7949); 20; 1-3; 631-639
    Format: text
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  • 6
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    Finite element analysis of wrinkling membranes (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The development of a nonlinear numerical algorithm for the analysis of stresses and displacements in partly wrinkled flat membranes, and its implementation on the SAP VII finite-element code are described. A comparison of numerical results with exact solutions of two benchmark problems reveals excellent agreement, with good convergence of the required iterative procedure. An exact solution of a problem involving axisymmetric deformations of a partly wrinkled shallow curved membrane is also reported.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-172325 , NAS 1.26:172325 , USC-CE-83-05
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  • 7
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    Buckling analysis for structural sections and stiffened plates reinforced with laminated composites. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A classical buckling analysis is developed for stiffened, flat plates composed of a series of linked flat plate and beam elements. Plates are idealized as multilayered orthotropic elements; structural beads and lips are idealized as beams. The loaded edges of the stiffened plate are simply supported and the conditions at the unloaded edges can be prescribed arbitrarily. The plate and beam elements are matched along their common junctions for displacement continuity and force equilibrium in an exact manner. Offsets between elements are considered in the analysis. Buckling under uniaxial compressive load for plates, sections and stiffened plates is investigated. Buckling loads are found as the lowest of all possible general and local failure modes and the mode shape is used to determine whether buckling is a local or general instability. Numerical correlations with existing analysis and test data for plates, sections and stiffened plates including boron-reinforced structures are discussed. In general, correlations are reasonably good.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal of Solids and Structures; 8; Mar. 197
    Format: text
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  • 8
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    Wind loads on flat plate photovoltaic array fields (nonsteady winds) (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Techniques to predict the dynamic response and the structural dynamic loads of flat plate photovoltaic arrays due to wind turbulence were analyzed. Guidelines for use in predicting the turbulent portion of the wind loading on future similar arrays are presented. The dynamic response and the loads dynamic magnification factor of the two array configurations are similar. The magnification factors at a mid chord and outer chord location on the array illustrated and at four points on the chord are shown. The wind tunnel test experimental rms pressure coefficient on which magnification factors are based is shown. It is found that the largest response and dynamic magnification factor occur at a mid chord location on an array and near the trailing edge. A technique employing these magnification factors and the wind tunnel test rms fluctuating pressure coefficients to calculate design pressure loads due to wind turbulence is presented.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-164745 , DOE/JPL-954833-81/4 , JPL-9950-594
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  • 9
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    Wind loads on flat plate photovoltaic array fields (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The results of an experimental analysis (boundary layer wind tunnel test) of the aerodynamic forces resulting from winds acting on flat plate photovoltaic arrays are presented. Local pressure coefficient distributions and normal force coefficients on the arrays are shown and compared to theoretical results. Parameters that were varied when determining the aerodynamic forces included tilt angle, array separation, ground clearance, protective wind barriers, and the effect of the wind velocity profile. Recommended design wind forces and pressures are presented, which envelop the test results for winds perpendicular to the array's longitudinal axis. This wind direction produces the maximum wind loads on the arrays except at the array edge where oblique winds produce larger edge pressure loads. The arrays located at the outer boundary of an array field have a protective influence on the interior arrays of the field. A significant decrease of the array wind loads were recorded in the wind tunnel test on array panels located behind a fence and/or interior to the array field compared to the arrays on the boundary and unprotected from the wind. The magnitude of this decrease was the same whether caused by a fence or upwind arrays.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-164454 , DOE/JPL-954833-81/3
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  • 10
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    Buckling analysis for axially compressed flat plates, structural sections, and stiffened plates reinforced with laminated composites (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A classical buckling analysis is developed for stiffened, flat plates composed of a series of linked plate and beam elements. Plates are idealized as multilayered orthotropic elements. Structural beads and lips are idealized as beams. The loaded edges of the stiffened plate are simply-supported and the conditions at the unloaded edges can be prescribed arbitrarily. The plate and beam elements are matched along their common junctions for displacement continuity and force equilibrium in an exact manner. Offsets between elements are considered in the analysis. Buckling under uniaxial compressive load for plates, sections, and stiffened plates is investigated. Buckling loads are the lowest of all possible general and local failure modes, and the mode shape is used to determine whether buckling is a local or general instability. Numerical correlations with existing analysis and test data for plates, sections, and stiffened plates including boron-reinforced structures are discussed. In general correlations are reasonably good.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-1887
    Format: application/pdf
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