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  • Engineering  (558)
  • STRUCTURAL MECHANICS  (443)
  • 1990-1994  (1,001)
  • 1990  (1,001)
  • 1
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    Recent developments in the micromechanics of advanced composites (1990)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: A summary of recent developments and results in the area of inelastic response of advanced composites obtained with the micromechanics model proposed by Aboudi is presented. The recent developments include investigation of linear viscoelastic response of polymer matrix composites and yielding and elastoplastic response of metal matrix composites. The predictive capability and accuracy of the model is demonstrated through comparison of the predicted results with experimental data and results of finite-element analyses.
    Keywords: STRUCTURAL MECHANICS
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  • 2
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    Computational technology for flight vehicles; Proceedings of the Symposium, Washington, DC, Nov. 5-7, 1990 (1990)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: Recent advances in computational fluid mechanics are discussed in reviews and reports. Sections are devoted to (1) the modeling of local phenomena and edge effects in solids, (2) stochastic modeling and simulation of fracture toughness, and (3) partitioning strategy and new finite elements. Particular attention is given to global and local finite-element/spectral-boundary-element techniques for failure analysis, simulations of microfracture in metal-matrix composites, fatigue analysis of cracked anisotropic plates under stochastic loading, mathematical modeling for the analysis of nonlinear aircraft dynamics, physical and mathematical modeling of wave propagation in the Ariane 5 VEB structure, partitioning based on symmetry transformations, an FEM approach to adaptive reliability assurance, and time-domain FEMs for the large rotational dynamics of multibody systems.
    Keywords: STRUCTURAL MECHANICS
    Type: (ISSN 0045-7949)
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  • 3
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    Advances and trends in computational structures technology (1990)
    In:  Other Sources
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    Publication Date: 2019-08-27
    Description: The major goals of computational structures technology (CST) are outlined, and recent advances in CST are examined. These include computational material modeling, stochastic-based modeling, computational methods for articulated structural dynamics, strategies and numerical algorithms for new computing systems, multidisciplinary analysis and optimization. The role of CST in the future development of structures technology and the multidisciplinary design of future flight vehicles is addressed, and the future directions of CST research in the prediction of failures of structural components, the solution of large-scale structural problems, and quality assessment and control of numerical simulations are discussed.
    Keywords: STRUCTURAL MECHANICS
    Type: Computing Systems in Engineering (ISSN 0956-0521); 1; 1, 19
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  • 4
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    The 24th Aerospace Mechanisms Symposium (1990)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The proceedings of the symposium are reported. Technological areas covered include actuators, aerospace mechanism applications for ground support equipment, lubricants, latches, connectors, and other mechanisms for large space structures.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CP-3062 , NAS 1.55:3062 , Apr 18, 1990 - Apr 20, 1990; Kennedy Space Center, FL; United States
    Format: application/pdf
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  • 5
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    Dynamic response of anisotropic composite panels to time-dependent external excitations (1990)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: This paper deals with the dynamic response of anisotropic laminated composite flat panels exposed to sonic boom and explosive blast-type loadings. The pertinent governing equations incorporating transverse shear deformation, transverse normal stress, the higher order effects as well as the viscous structural damping are solved by using the integral-transform technique. The obtained results are compared with their counterparts obtained within the framework of the first order transverse shear deformation and the classical plate theories and some conclusions concerning their range of applicability are outlined. The paper also contains a detailed analysis of the influence played by the various parameters characterizing the considered pressure pulses as well as the material and geometry of the plate.
    Keywords: STRUCTURAL MECHANICS
    Type: ICAS Congress; Sept. 9-14, 1990; Stockholm; Sweden
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  • 6
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    Postbuckling response of long thick plates loaded in compression including higher order transverse shearing effects (1990)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: This paper presents buckling and postbuckling results for compression-loaded simply-supported aluminum plates and composite plates with a symmetric lay-up of thin +/-45-deg plies composed of many layers. Buckling results for aluminum plates of finite length are given for various length-to-width ratios. Asymptotes to the curves based on the buckling results give N(XCr) for plates of infinite length. Postbuckling results for plates with transverse shearing flexibility are compared to results from classical theory for various width-to-thickness ratios. Characteristic curves indicating the average longitudinal direct stress resultant as a function of the applied displacements are calculated based on four different theories: classical von Karman theory using the Kirchhoff assumptions, first-order shear deformation theory, higher-order shear deformation theory, and three-dimensional flexibility theory. Present results indicate that the three-dimensional flexibility theory gives the lowest buckling loads. The higher-order shear deformation theory has fewer unknowns than the three-dimensional flexibility theory but does not take into account through-the-thickness effects. The figures presented show that small differences occur in the average longitudinal direct stress resultants from the four theories that are functions of applied end-shortening displacement.
    Keywords: STRUCTURAL MECHANICS
    Type: ICAS Congress; Sept. 9-14, 1990; Stockholm; Sweden
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  • 7
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    Free vibrations of thin-walled semicircular graphite-epoxy composite frames (1990)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: A detailed study is made of the effects of variations in lamination and material parameters of thin walled composite frames on their vibrational characteristics. The structures considered are semicircular thin walled frames with I and J sections. The flanges and webs of the frames are modeled by using 2-D shell and plate finite elements. A mixed formulation is used with the fundamental unknowns consisting of both the generalized displacements and stress resultants in the frame. The frequencies and modes predicted by the 2-D finite element model are compared with those obtained from experiments, as well as with the predictions of a non-dimensional thin walled beam finite element model. A detailed study is made of the sensitivity of the vibrational response to variations in the fiber orientation, material properties of the individual layers, and boundary conditions.
    Keywords: STRUCTURAL MECHANICS
    Type: ICAS Congress; Sept. 9-14, 1990; Stockholm; Sweden
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  • 8
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    Summary of a study to determine low-velocity impact damage and residual tension strength for a thick graphite/epoxy motor case (1990)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: Impacters of various shapes and masses were dropped from various heights onto 36 mm (1.4 in.) thick graphite/epoxy cylinders, which represented filament wound cases (FWC) for the booster motors of the Space Shuttle. Insert solid propellant was cast into some of the cylinders. The cylinders were impacted numerous times around the circumference and then cut into 51 mm (2.0 in.) wide tension specimens, each containing an impact site. Four indenters were used: a sharp corner, two hemispheres, and a bolt-like rod. The diameters of the hemispheres were 12.7 mm (0.5 in.) and 25.4 mm (1.0 in.), and the diameter of the rod was 6.3 mm (0.25 in.). Impacts with the rod were simulated by pressing the rod against the face of specimens. For the hemispheres, the damage initiated beneath the surface at a critical contact pressure and was not visible on the surface until an even larger pressure was exceeded. The damage consisted of matrix cracking and broken fiber. The rod and corner made visible surface damage in all tests. For the hemispheres, the tension strength was reduced considerably before the damage was visible on the surface, 30 percent for the 25.4 mm (1.0 in.) diameter hemisphere and 10 percent for the 12.7 mm (0.5 in.) diameter hemisphere. Analytical methods were used to predict the damage and residual tension strength. A factor of safety to account for nonvisible damage was determined.
    Keywords: STRUCTURAL MECHANICS
    Type: ICAS Congress; Sept. 9-14, 1990; Stockholm; Sweden
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  • 9
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    Fatigue crack propagation in aerospace aluminum alloys (1990)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: This paper reviews fracture mechanics based, damage tolerant characterizations and predictions of fatigue crack growth in aerospace aluminum alloys. The results of laboratory experimentation and modeling are summarized in the areas of: (1) fatigue crack closure, (2) the wide range crack growth rate response of conventional aluminum alloys, (3) the fatigue behavior of advanced monolithic aluminum alloys and metal matrix composites, (4) the short crack problem, (5) environmental fatigue, and (6) variable amplitude loading. Remaining uncertainties and necessary research are identified. This work provides a foundation for the development of fatigue resistant alloys and composites, next generation life prediction codes for new structural designs and extreme environments, and to counter the problem of aging components.
    Keywords: STRUCTURAL MECHANICS
    Type: ICAS Congress; Sept. 9-14, 1990; Stockholm; Sweden
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  • 10
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    A model for predicting damage induced fatigue life of laminated composite structural components (1990)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: This paper presents a model for predicting the life of laminated composite structural components subjected to fatigue induced microstructural damage. The model uses the concept of continuum damage mechanics, wherein the effects of microcracks are incorporated into a damage dependent lamination theory instead of treating each crack as an internal boundary. Internal variables are formulated to account for the effects of both matrix cracks and internal delaminations. Evolution laws for determining the damage variables as functions of ply stresses are proposed, and comparisons of predicted damage evolution are made to experiment. In addition, predicted stiffness losses, as well as ply stresses are shown as functions of damage state for a variety of stacking sequences.
    Keywords: STRUCTURAL MECHANICS
    Type: ICAS Congress; Sept. 9-14, 1990; Stockholm; Sweden
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