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  • 1
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    The use of NASTRAN in the design of wind tunnel research aircraft (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The relationship between NASTRAN and the wind tunnel model design process is discussed. Specific cases illustrating the use of NASTRAN for static, heat transfer, dynamic, and aeroelastic analyses are presented. Advantages and disadvantages of using NASTRAN are summarized.
    Keywords: STRUCTURAL MECHANICS
    Type: COSMIC, 15th NASTRAN (R) Users' Colloquium; p 166-183
    Format: application/pdf
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  • 2
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    IBM JCL made easy by means of ISPF dialog application (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: An interactive cathode ray tube (CRT) terminal application has been developed which automatically generates the job control language (JCL) and submits NASTRAN batch jobs at an IBM mainframe installation. The relevant parameters for each NASTRAN batch job are stored in a table. Once a table entry is defined, the corresponding NASTRAN batch job may be submitted as often as desired with a minimum of keystrokes. For most users, there is no need for any knowledge of JCL.
    Keywords: STRUCTURAL MECHANICS
    Type: COSMIC, 15th NASTRAN (R) Users' Colloquium; p 36-55
    Format: application/pdf
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  • 3
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    Thermally induced stresses in cross-ply composite tubes (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An approximate solution for determining stresses in cross-ply composite tubes subjected to a circumferential temperature gradient is presented. The solution is based on the principle of complementary virtual work (PCVW) in conjunction with a Ritz approximation on the stress field and accounts for the temperature dependence of material properties. The PCVW method is compared with a planar elasticity solution using temperature-independent material properties and a Navier approach. The net effect of including temperature-dependent material properties is that the peak absolute values of the stresses are reduced. The dependence of the stresses on the circumferential location is also reduced in comparison with the case of temperature-independent properties.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 86-0968
    Format: text
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  • 4
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    Stresses and deformations in cross-ply composite tubes subjected to a uniform temperature change: Elasticity and Approximate Solutions (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The effects of a uniform temperature change on the stresses and deformations of composite tubes are investigated. The accuracy of an approximate solution based on the principle of complementary virtual work is determined. Interest centers on tube response away from the ends and so a planar elasticity approach is used. For the approximate solution a piecewise linear variation of stresses with the radial coordinate is assumed. The results from the approximate solution are compared with the elasticity solution. The stress predictions agree well, particularly peak interlaminar stresses. Surprisingly, the axial deformations also agree well. This, despite the fact that the deformations predicted by the approximate solution do not satisfy the interface displacement continuity conditions required by the elasticity solution. The study shows that the axial thermal expansion coefficient of tubes with a specific number of axial and circumferential layers depends on the stacking sequence. This is in contrast to classical lamination theory which predicts the expansion to be independent of the stacking arrangement. As expected, the sign and magnitude of the peak interlaminar stresses depends on stacking sequence.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-176147 , NAS 1.26:176147 , COMS-85-06 , VPI-E-85-15 , IR-51
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  • 5
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    The effects of pin elasticity, clearance, and friction on the stresses in a pin-loaded orthotropic plate (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The effects of pin elasticity, clearance, and friction on the stresses in a pin loaded orthotropic plate are studied. The effects are studied by posing the problem as a planar contact elasticity problem, the pin and the plate being two elastic bodies which interact through contact. Coulomb friction is assumed, the pin loads the plate in one of its principal material directions, and the plate is infinite in extent. A collocation scheme and interaction, in conjunction with a complex variable series solution, are used to obtain numerical results. The contact region between the plate and pin is unknown and must be solved for as part of the solution. The same is true of the region of friction induced no slip. Two pin stiffnesses, two clearance levels, two friction levels and two laminates, a (0/+ or - 45/90)s and a (02/+ or - 45)s, are studied. The effects of pin elasticity, clearance, and friction on the load capacity of the plate are assessed by comparing the load capacity of the plate with the capacity when the pin is rigid, perfectly fitting, and frictionless.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Composite Materials (ISSN 0021-9983); 21; 190-206
    Format: text
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  • 6
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    Stresses and deformations in composite tubes due to a circumferential temperature gradient (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A linear elasticity solution for determining the response of composite tubes subjected to a circumferential temperature gradient is presented. Numerical examples are used to show that, in a single layer tube, fiber orientation strongly influences response. When the fibers are aligned axially, all stress components in the tube are small. When the fibers are aligned circumferentially, the hoop stress becomes large. This difference in behavior is due to the large difference between the radial and circumferential coefficients of thermal expansion when the fibers are oriented circumferentially. In multilayer tubes, stresses are quite high and just two constants characterize the overall bending and axial deformations of the tubes.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME, Transactions, Journal of Applied Mechanics (ISSN 0021-8936); 53; 757-764
    Format: text
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