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  • STRUCTURAL MECHANICS  (242)
  • 1975-1979  (191)
  • 1960-1964  (51)
  • 1
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    A stand-alone interactive graphics finite element modeling system (1977)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: The finite element modeling (FEM) system described here is an interactive graphics system designed for use with an intelligent terminal. It offers an economical alternative to the conventional methods (hand compilation and remote terminals) of 2 and 3-dimensional model generation. Using local computing and local storage, this FEM system allows the operator to create and display 3-dimensional models entirely off-line from the host computer. This eliminates costly on-line computer and host-processing time, and makes the user more effective by greatly reducing computer response time. The system allows model generation by down-loading node and element data from the host computer or by using the system's model generation operations for digitizing and automatic creation. The system then generates completed model information in the desired analysis package's bulk data format and transmits it to the host computer for finite element analysis.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, Washington 6th NASTRAN (R) Users' Colloq.; p 327-340
    Format: text
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  • 2
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    Buckling of a Cylindrical Shell Loaded by a Pre-tensioned Filament Winding (1964)
    In:  CASI
    Details
    Publication Date: 2019-05-23
    Description: Buckling strength of cylindrical shell loaded by pretensioned filament winding
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-X-54745
    Format: application/pdf
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  • 3
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    Terrestrial, lunar, and planetary applications of navigation and geodetic satellites. (1963)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Role that navigation and geodetic satellites can play in terrestrial, lunar and planetary studies
    Keywords: STRUCTURAL MECHANICS
    Format: text
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  • 4
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    Structural stiffness, strength and dynamic characteristics of large tetrahedral space truss structures (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Physical characteristics of large skeletal frameworks for space applications are investigated by analyzing one concept: the tetrahedral truss, which is idealized as a sandwich plate with isotropic faces. Appropriate analytical relations are presented in terms of the truss column element properties which for calculations were taken as slender graphite/epoxy tubes. Column loads, resulting from gravity gradient control and orbital transfer, are found to be small for the class structure investigated. Fundamental frequencies of large truss structures are shown to be an order of magnitude lower than large earth based structures. Permissible loads are shown to result in small lateral deflections of the truss due to low-strain at Euler buckling of the slender graphite/epoxy truss column elements. Lateral thermal deflections are found to be a fraction of the truss depth using graphite/epoxy columns.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-X-74001
    Format: application/pdf
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  • 5
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    Recent finite element studies in plasticity and fracture mechanics (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The paper reviews recent work on fundamentals of elastic-plastic finite-element analysis and its applications to the mechanics of crack opening and growth in ductile solids. The presentation begins with a precise formulation of incremental equilibrium equations and their finite-element forms in a manner valid for deformations of arbitrary magnitude. Special features of computational procedures are outlined for accuracy in view of the near-incompressibility of elastic-plastic response. Applications to crack mechanics include the analysis of large plastic deformations at a progressively opening crack tip, the determination of J integral values and of limitations to J characterizations of the intensity of the crack tip field, and the determination of crack tip fields in stable crack growth.
    Keywords: STRUCTURAL MECHANICS
    Format: text
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  • 6
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    The effects of localized damping on structural response (1975)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The effect of localized structural damping on the excitability of higher order normal modes of the large space telescope was investigated. A preprocessor computer program was developed to incorporate Voigt structural joint damping models in a NASTRAN finite-element dynamic model. A postprocessor computer program was developed to select critical modes for low-frequency attitude control problems and for higher frequency fine-stabilization problems. The mode selection is accomplished by ranking the flexible modes based on coefficients for rate gyro, position gyro, and optical sensors, and on image-plane motions due to sinusoidal or random power spectral density force and torque inputs.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Res. Center NASTRAN: Users' Experiences; p 301-320
    Format: application/pdf
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  • 7
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    Three-dimensional finite strip analysis of elastic solids (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Finite element shape functions were combined with beam eigenfunctions to formulate three-dimensional finite strips. Because of the orthogonality of the beam functions, three-dimensional problems were reduced to a series of two-dimensional problems, often with stiffness matrices of very narrow bandwidth. Isoparametric and high order finite element shape functions were used in the formulation of the 3-D finite strips. Numerical examples such as the static and free vibration analyses of simply supported thick plates are presented. Results were compared with existing solutions and good agreements were obtained in all cases.
    Keywords: STRUCTURAL MECHANICS
    Type: Res in Computerized Structural Analysis and Syn.,; p 153-164
    Format: application/pdf
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  • 8
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    Solving magnetostatic field problems with NASTRAN (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Determining the three-dimensional magnetostatic field in current-induced situations has usually involved vector potentials, which can lead to excessive computational times. How such magnetic fields may be determined using scalar potentials is reviewed. It is shown how the heat transfer capability of NASTRAN level 17 was modified to take advantage of the new method.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Marshall Space Flight Center Seventh NASTRAN User's Colloq.; p 291-299
    Format: application/pdf
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  • 9
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    Pre and post processing using the IBM 3277 display station graphics attachment (RPQ7H0284) (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A graphical interactive procedure operating under TSO and utilizing two CRT display terminals is shown to be an effective means of accomplishing mesh generation, establishing boundary conditions, and reviewing graphic output for finite element analysis activity.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Marshall Space Flight Center Seventh NASTRAN User's Colloq.; p 123-130
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  • 10
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    New large deflection analysis for NASTRAN (1977)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: A large deflection analysis was developed for NASTRAN level 16 as an alternative to Rigid Format 4. A progress report is presented for a long term, general nonlinear analysis NASTRAN project, which contains (1) the theory of the structural analysis and numerical analysis methods presently used, and (2) some simple test problems comparing the new analysis with Rigid Format 4.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, Washington 6th NASTRAN (R) Users' Colloq.; p 235-255
    Format: text
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