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  • STRUCTURAL MECHANICS  (2,497)
  • 1990-1994  (1,990)
  • 1960-1964  (507)
  • 1
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    Nasa to Launch Beacon Explorer, Will Test Laser News Release No. 64-237 (1964)
    In:  CASI
    Details
    Publication Date: 2019-12-18
    Description: Beacon explorer satellite for ionospheric study and evaluation of laser technique for deriving orbital and geodetic information
    Keywords: STRUCTURAL MECHANICS
    Type: HQ-E-DAA-TN75269
    Format: application/pdf
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  • 2
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    NASA to Launch Air Density Explorer (1963)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Spherical satellite for measuring upper atmosphere air density launched by scout vehicle
    Keywords: STRUCTURAL MECHANICS
    Type: Release No. 63-271
    Format: application/pdf
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  • 3
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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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  • 4
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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.
    Format: text
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  • 5
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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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  • 6
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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.
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  • 7
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    Transverse shear deformation in exact buckling and vibration of composite plate assemblies (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA Journal (ISSN 0001-1452); 31; 10; p. 1963-1965. Abridg
    Format: text
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  • 8
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    Strain energy of thermally stressed multilayer panels and its sensitivity coefficients (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A study is made of the effect of lamination and material parameters of thermally stressed multilayer composite panels on the strain energy and its sensitivity coefficients obtained by the three-dimensional thermoelasticity model. The sensitivity coefficients measure the sensitivity of the strain energy to variations in the different lamination and material parameters of the panel. The strain energy and sensitivity coefficients obtained by the three-dimensional model are used as the basis for assessing the accuracy of the corresponding quantities obtained by two-dimensional first-order shear deformation theory. Numerical results are presented for antisymmetrically laminated angle-ply panels subjected to linear temperature variation through the thickness. The numerical results demonstrate the accuracy of the strain energy and its sensitivity coefficients obtained by the first-order shear deformation theory, for the range of parameters considered, and the importance of the particular terms in the strain energy, which vanish for single-layer panels.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA Journal (ISSN 0001-1452); 31; 10; p. 1946-1952.
    Format: text
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  • 9
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    Aeroservoelastic DAP missile fin development (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The development of an active aeroservoelastic missile fin using directionally attached piezoelectric (DAP) actuator elements is detailed. Several different types of actuator elements are examined, including piezoelectric polymers, piezoelectric fiber composites, and conventionally attached piezoelectric (CAP) and DAP elements. These actuator elements are bonded to the substrate of a torque plate. The root of the torque plate is attached to a fuselage hard point or folding pivot. The tip of the plate is bonded to an aerodynamic shell which undergoes a pitch change as the plate twists. The design procedures used on the plate are discussed. A comparison of the various actuator element shows that DAP elements provide the highest deflections with the highest torsional stiffness. A torque plate was constructed from 0.2032 mm thick DAP elements bonded to a 0.127 mm thick AISI 1010 steel substrate. The torque plate produced static twist deflections in excess of +/- 3 deg. An aerodynamic shell with a modified NACA 0012 profile was added to the torque plate. This fin was tested in a wind tunnel at speeds up to 50 ms/sec. The static deflection of the fin was predicted to within 6 percent of the experimental data.
    Keywords: STRUCTURAL MECHANICS
    Type: Smart Materials and Structures (ISSN 0964-1726); 2; 2; p. 55-65.
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  • 10
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    Compressive and shear buckling analysis of metal matrix composite sandwich panels under different thermal environments (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Combined inplane compressive and shear buckling analysis was conducted on flat rectangular sandwich panels using the Raleigh-Ritz minimum energy method with a consideration of transverse shear effect of the sandwich core. The sandwich panels were fabricated with titanium honeycomb core and laminated metal matrix composite face sheets. The results show that slightly slender (along unidirectional compressive loading axis) rectangular sandwich panels have the most desirable stiffness-to-weight ratios for aerospace structural applications; the degradation of buckling strength of sandwich panels with rising temperature is faster in shear than in compression; and the fiber orientation of the face sheets for optimum combined-load buckling strength of sandwich panels is a strong function of both loading condition and panel aspect ratio. Under the same specific weight and panel aspect ratio, a sandwich panel with metal matrix composite face sheets has much higher buckling strength than one having monolithic face sheets.
    Keywords: STRUCTURAL MECHANICS
    Type: Composite Structures (ISSN 0263-8223); 25; 4-Jan; p. 227-239.
    Format: text
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