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  • 1
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    3-D inelastic analysis methods for hot section components. Volume 2: Advanced special functions models (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This Annual Status Report presents the results of work performed during the third year of the 3-D Inelastic Analysis Methods for Hot Sections Components program (NASA Contract NAS3-23697). The objective of the program is to produce a series of computer codes that permit more accurate and efficient three-dimensional analyses of selected hot section components, i.e., combustor liners, turbine blades, and turbine vanes. The computer codes embody a progression of mathematical models and are streamlined to take advantage of geometrical features, loading conditions, and forms of material response that distinguish each group of selected components.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-179517 , NAS 1.26:179517 , PWA-5940-46-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    On 3-D inelastic analysis methods for hot section components (base program) (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A 3-D Inelastic Analysis Method program is described. This program consists of a series of new computer codes embodying a progression of mathematical models (mechanics of materials, special finite element, boundary element) for streamlined analysis of: (1) combustor liners, (2) turbine blades, and (3) turbine vanes. These models address the effects of high temperatures and thermal/mechanical loadings on the local (stress/strain)and global (dynamics, buckling) structural behavior of the three selected components. Three computer codes, referred to as MOMM (Mechanics of Materials Model), MHOST (Marc-Hot Section Technology), and BEST (Boundary Element Stress Technology), have been developed and are briefly described in this report.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-175060 , NAS 1.26:175060 , ASR-2 , PWA-5940-36
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    NASA TECHNICAL REPORTS
  • 3
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    Stress analysis of gas turbine engine structures using the boundary element method (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The theory of the boundary element method is briefly reviewed with particular reference to the feasibility of elastic and inelastic three-dimensional stress analysis of complex structures characteristic of gas turbine engine components. Particular requirements of gas turbine analysis are defined, and examples of the use of a boundary element code designed for the three-dimensional stress analysis of turbine components are presented. It is shown that the general-purpose boundary element code can accurately and efficiently analyze many of the gas turbine engine structures.
    Keywords: STRUCTURAL MECHANICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    ROTATIONAL DECAY OF SATELLITE 1960 ETA 2 DUE TO THE MAGNETIC FIELD OF THE EARTH (1963)
    In:  Other Sources
    Details
    Publication Date: 2018-12-01
    Description: Exponential decay of rotation and corresponding damping torques on orbiting satellites due to the earths magnetic field
    Keywords: STRUCTURAL MECHANICS
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  • 5
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    Three-dimensional Stress Analysis Using the Boundary Element Method (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The boundary element method is to be extended (as part of the NASA Inelastic Analysis Methods program) to the three-dimensional stress analysis of gas turbine engine hot section components. The analytical basis of the method (as developed in elasticity) is outlined, its numerical implementation is summarized, and the approaches to be followed in extending the method to include inelastic material response indicated.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Lewis Research Center Nonlinear Struct. Anal.; p 149-160
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  • 6
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    Results of ground vibration tests on a YF-12 airplane (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Ground vibration tests were conducted on a YF-12 airplane. To approximate a structural free-free boundary condition during the tests, each of the landing gears was supported on a support system designed to have a low natural frequency. The test equipment and the procedures used for the ground vibration tests are described. The results are presented in the form of frequency response data, measured mode lines, and elastic mode shapes for the wing/body, rudder, and fuselage ventral fin. In the frequency range between 3.4 cps and 28.8 cps, nine symmetrical wing/body modes, six antisymmetrical wing/body modes, two rudder modes, and one ventral fin mode were measured.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-X-2880 , H-736
    Format: application/pdf
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  • 7
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    3-D inelastic analysis methods for hot section components (base program) (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A 3-D inelastic analysis methods program consists of a series of computer codes embodying a progression of mathematical models (mechanics of materials, special finite element, boundary element) for streamlined analysis of combustor liners, turbine blades, and turbine vanes. These models address the effects of high temperatures and thermal/mechanical loadings on the local (stress/strain) and global (dynamics, buckling) structural behavior of the three selected components. These models are used to solve 3-D inelastic problems using linear approximations in the sense that stresses/strains and temperatures in generic modeling regions are linear functions of the spatial coordinates, and solution increments for load, temperature and/or time are extrapolated linearly from previous information. Three linear formulation computer codes, referred to as MOMM (Mechanics of Materials Model), MHOST (MARC-Hot Section Technology), and BEST (Boundary Element Stress Technology), were developed and are described.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-174700 , NAS 1.26:174700 , PWA-5940-19 , ASR-1
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  • 8
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    Free-vibration analysis of three-dimensional solids by BEM (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: This paper discusses the calculation of natural frequencies and mode shapes of three-dimensional solids, using the boundary element method. The metod developed is based on the use of particular integrals of the elastic equilibrium equations, and employs only real arithmetic. It represents an extension to three dimensions of work previously carried out for two-dimensional problems by Ahmad and Banerjee (1986) and Nardini and Brebbia (1982). The method has been incorporated, for multiregion analysis, in the BEST3D (Boundary Element Solution Technology, Three-Dimensional) computer program. Results of the boundary element calculations are compared with analytical, finite element, and experimental results.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal for Numerical Methods in Engineering (ISSN 0029-5981); 30; 1737-175
    Format: text
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