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  • Books
  • Other Sources  (902)
  • STRUCTURAL MECHANICS  (902)
  • 1990-1994  (902)
  • 1993  (367)
  • 1992  (535)
  • 1
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    Flexible structure experiments at JPL and WPAFB - H(infinity) controller designs (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Control system experiments are described that were carried out on flexible structure facilities at the Jet Propulsion Laboratory (JPL) and the Wright-Patterson Air Force Base (WPAFB). The feedback controllers were designed using the technique of weighted gap optimization to increase structural damping and achieve robust control.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal of Control (ISSN 0020-7179); 58; 1; p. 1-19.
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  • 2
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    Delaminations in composite plates under transverse impact loads - Experimental results (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Tests were performed measuring the locations and geometries of delaminations in Fiberite T300/976 graphite/epoxy, Fiberite IM7/977-2 graphite-toughened epoxy, and ICI APC-2 graphite/PEEK plates subjected to transverse impact loads. The data provide specific information on the effects of impactor velocity, impactor mass, material, thickness of back ply group, difference in fiber orientation between adjacent ply groups, plate thickness, and impactor nose radius. The data were compared to the results of the Finn-Springer model. The model was found to describe the data with reasonable accuracy.
    Keywords: STRUCTURAL MECHANICS
    Type: Composite Structures (ISSN 0263-8223); 23; 3; p. 191-204.
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  • 3
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    Aerostructural safety factor criteria using deterministic reliability (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Spacecraft and Rockets (ISSN 0022-4650); 30; 2; p. 244-247.
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  • 4
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    Impact-damaged graphite-thermoplastic trapezoidal-corrugation sandwich and semi-sandwich panels (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The results of a study of the effects of impact damage on compression-loaded trapezoidal-corrugation sandwich and semi-sandwich graphite-thermoplastic panels are presented. Sandwich panels with two identical face sheets and a trapezoidal corrugated core between them, and semi-sandwich panels with a corrugation attached to a single skin are considered in this study. Panels were designed, fabricated and tested. The panels were made using the manufacturing process of thermoforming, a less-commonly used technique for fabricating composite parts. Experimental results for unimpacted control panels and panels subjected to impact damage prior to loading are presented. Little work can be found in the literature about these configurations of thermoformed panels.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Composite Materials (ISSN 0021-9983); 27; 5; p. 526-538.
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  • 5
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    Large-amplitude finite element flutter analysis of composite panels in hypersonic flow (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA Journal (ISSN 0001-1452); 31; 6; p. 1090-1099.
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  • 6
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    Singularity in structural optimization (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The conditions under which global and local singularities may arise in structural optimization are examined. Examples of these singularities are presented, and a framework is given within which the singularities can be recognized. It is shown, in particular, that singularities can be identified through the analysis of stress-displacement relations together with compatibility conditions or the displacement-stress relations derived by the integrated force method of structural analysis. Methods of eliminating the effects of singularities are suggested and illustrated numerically.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal for Numerical Methods in Engineering (ISSN 0029-5981); 36; 6; p. 931-944.
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  • 7
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    The isolation limits of stochastic vibration (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The vibration isolation problem is formulated as a 1D kinematic problem. The geometry of the stochastic wall trajectories arising from the stroke constraint is defined in terms of their significant extrema. An optimal control solution for the minimum acceleration return path determines a lower bound on platform mean square acceleration. This bound is expressed in terms of the probability density function on the significant maxima and the conditional fourth moment of the first passage time inverse. The first of these is found analytically while the second is found using a Monte Carlo simulation. The rms acceleration lower bound as a function of available space is then determined through numerical quadrature.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Sound and Vibration (ISSN 0022-460X); 160; 2; p. 205-223.
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  • 8
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    Composite sandwich construction with syntactic foam core - A practical assessment of post-impact damage and residual strength (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: An account is given of an inspection method that has been successfully used to assess the postimpact damage and residual strength of syntactic (glass microspheres in epoxy matrix) foam-core sandwich panels with hybrid (carbon and glass fiber-reinforced) composite skins, which inherently possess high damage tolerance. SEM establishes that the crushing of the microspheres is responsible for the absorption of most of the impact energy. Damage tolerance is a function of the localization of damage by that high impact energy absorption.
    Keywords: STRUCTURAL MECHANICS
    Type: Composites (ISSN 0010-4361); 24; 5; p. 447-450.
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  • 9
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    A new constitutive equation for elastomers (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: A new mathematical approach for quantifying the mechanical properties of elastomeric materials under biaxial loads is presented. Specific equations relating principal strains and principal true stresses for a homogeneous, isotropic, and elastic material are proposed that resemble the conventional Hooke's law of linear elasticity. The predicted stresses are compared to those from three different sets of experimental data and to stresses from three different theories based on Rivlin's work-of-deformation approach. The proposed approach is considered to be of benefit to design engineers involved in a broad range of rubber products.
    Keywords: STRUCTURAL MECHANICS
    Type: Rubber & Plastics News (ISSN 0300-6123); p. 15-21.
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  • 10
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    Effect of stiffness characteristics on the response of composite grid-stiffened structures (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Aircraft (ISSN 0021-8669); 30; 4; p. 541-546.
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