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  • STRUCTURAL MECHANICS  (3,979)
  • 1990-1994  (1,990)
  • 1965-1969  (1,988)
  • 1950-1954  (1)
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Keywords
Years
Year
  • 1
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    The Stability of Eccentrically Stiffened Circular Cylinders. Volume 3 - Appendix (1967)
    In:  CASI
    Details
    Publication Date: 2019-11-02
    Description: Critical stress curves of compressive buckling for longitudinally stiffened cylinders
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-91221 , GDC DDG-67-006, V. 3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    A Method of Stress Analysis for Semi-Toroidal Tanks, Part 2 (1967)
    In:  CASI
    Details
    Publication Date: 2019-11-02
    Description: Stress analysis of semitoroidal and ogival tanks
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-61183
    Format: application/pdf
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  • 3
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    Determination of the natural oscillating frequencies of shells of complex shape with free edges (1968)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Resonant frequencies of circular cylindrical, elliptical, turbine shaped, and conical shells
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TT-F-11719
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Photoelastometric determination of the stress state in the zone close to cracks in a circular plate with a central hole and other regularly spaced peripheral holes on application of uniform pressure to the external cyclindrical surface (1967)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Models of fuel bearing nuclear reactor core matrices for analysis of individual principal and circumferential stresses based on isocline isochromatic spectra of geometric configurations
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TT-F-11371
    Format: text
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  • 5
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    Transient loads from thrust excitation - Space vehicle design criteria /structures/ (1969)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Analysis of transient loads produced by ignition of rocket engine during launch and flight operations for solid and liquid propellant rocket engines
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-SP-8030
    Format: application/pdf
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  • 6
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    Vibration of plates (1969)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Tabulated numerical results of theories of plate vibration
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-SP-160
    Format: application/pdf
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  • 7
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    Transverse cracking and stiffness reduction in composite laminates (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A study of transverse cracking mechanism in composite laminates is presented using a singular hybrid finite element model. The model provides the global structural response as well as the precise local crack-tip stress fields. An elasticity basis for the problem is established by employing Lekhnitskii's complex variable potentials and method of eigenfunction expansion. Stress singularities associated with the transverse crack are obtained by decomposing the deformation into the symmetric and antisymmetric modes and proper boundary conditions. A singular hybrid element is thereby formulated based on the variational principle of a modified hybrid functional to incorporate local crack singularities. Axial stiffness reduction due to transverse cracking is studied. The results are shown to be in very good agreement with the existing experimental data. Comparison with simple shear lag analysis is also given. The effects of stress intensity factors and strain energy density on the increase of crack density are analyzed. The results reveal that the parameters approach definite limits when crack densities are saturated, an evidence of the existence of characteristic damage state.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Reinforced Plastics and Composites (ISSN 0731-6844); 12; 9; p. 987-1015.
    Format: text
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  • 8
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    Thermal stresses in thick laminated composite shells (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The paper provides an analytical formulation to investigate the thermomechanical behavior of thick composite shells subjected to a temperature distribution which varies arbitrarily in the radial direction. For illustrative purposes, shells under uniform temperature change are presented. It is found that thermal twist would occur even for symmetric laminated shells. Under uniform temperature rise, results for off-axis graphite/epoxy shells show that extensional-shear coupling can cause tensile radial stress throughout the shell and tensile hoop stress in the inner region. Laminated graphite/epoxy shells can exhibit negative effective thermal expansion coefficients in the longitudinal and transverse directions. Finally, the stacking sequence has a strong influence on the thermal stress distributions.
    Keywords: STRUCTURAL MECHANICS
    Type: Composite Structures (ISSN 0263-8223); 26; 2-Jan; p. 63-75.
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  • 9
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    Recent advances in approximation concepts for optimum structural design (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The basic approximation concepts used in structural optimization are reviewed. Some of the most recent developments in that area since the introduction of the concept in the mid-seventies are discussed. The paper distinguishes between local, medium-range, and global approximations; it covers functions approximations and problem approximations. It shows that, although the lack of comparative data established on reference test cases prevents an accurate assessment, there have been significant improvements. The largest number of developments have been in the areas of local function approximations and use of intermediate variable and response quantities. It also appears that some new methodologies are emerging which could greatly benefit from the introduction of new computer architecture.
    Keywords: STRUCTURAL MECHANICS
    Type: In: Optimization of large structural systems; Proceedings of the NATO(DFG Advanced Study Institute, Berchtesgaden, Germany, Sept. 23-Oct. 4, 1991. Vol. 1 (A93-54501 24-39); p. 235-256.
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  • 10
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    Material selection and evaluation aimed at resolving deficiencies of a space technology material (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: NASA-Kennedy Space Center propellant handlers' visors are undergoing conversion from Plexiglass G to a Surlyn 8920-based material; various Surlyn compositions are here subjected to a battery of environmental and mechanical-properties tests under the relevant conditions. Specially-molded Surlyn samples have exhibited much higher impact strengths than either Plexiglass G or Lexan, and passed the ANSI weight-drop test. DSC results show that Surlyn and Plexiglass G exhibit strikingly different thermal transitions.
    Keywords: STRUCTURAL MECHANICS
    Type: In: International SAMPE Technical Conference, 24th and International SAMPE Metals and Metals Processing Conference, 3rd, Toronto, Canada, Oct. 20-22, 1992, Proceedings. Vol. 24 (A93-53376 23-23); p. T724-T734.
    Format: text
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