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  • STRUCTURAL MECHANICS  (861)
  • 1990-1994  (226)
  • 1985-1989  (204)
  • 1975-1979  (157)
  • 1965-1969  (274)
  • 1925-1929
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  • 1
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    Decoupled dynamic analysis of combined systems by iterative determination of interface accelerations (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A dynamic analysis technique is presented that can be used to determine the response of a discrete model of a large linear structural system composed of multiple substructures. The technique circumvents the costly computation of the modal characteristics of the combined system. This is accomplished by relying on a predictor-corrector scheme to converge iteratively to the interface accelerations of the combined system, while the equations of motions of the individual structures are integrated separately. In this regard, the temporal slopes of the interface accelerations (jerks) are computed at each time point of integration to predict the interface accelerations at the next time point. The proposed technique is exemplified by conducting a Space Shuttle landing loads analysis; the obtained numerical data demonstrate its reliability and efficiency.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 87-0822
    Format: text
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  • 2
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    Deformations and strains in a thick adherend lap joint (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Displacement fields in a thick adherend lap joint were measured by high-sensitivity moire interferometry. Contour maps of in-plane U and V displacements were obtained across adhesive and adherend surfaces. Loads ranged from a modest load to a near-failure load. Quantitative results are given for displacements and strains in the adhesive and along the adhesive/adherend boundary lines. The results show nearly constant shear strain in the adhesive, nonlinear strains as a function of load or average shear stress, and viscoelastic or time-dependent response. Longitudinal normal strains in the adhesive are nearly two orders of magnitude less than the shear strains. With its subwavelength displacement resolution and high spatial resolution, moire interferometry is especially well suited for deformation studies of adhesive joints.
    Keywords: STRUCTURAL MECHANICS
    Type: International Symposium on Adhesively Bonded Joints; Testing, Analysis, and Design; Sept. 10-12, 1986; Baltimore, MD; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Dynamic stability and parametric resonance in cylindrical propellant tanks Final report (1968)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Dynamic stability and parametric resonance of longitudinally excited liquid propellant tank model
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-61725
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    An accurate nonlinear finite element analysis and test correlation of a stiffened composite wing panel (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: State-of-the-art nonlinear finite element analysis techniques are evaluated by applying them to a realistic aircraft structural component. A wing panel from the V-22 tiltrotor aircraft is chosen because it is a typical modern aircraft structural component for which there is experimental data for comparison of results. From blueprints and drawings, a very detailed finite element model containing 2284 9-node Assumed Natural-Coordinate Strain elements was generated. A novel solution strategy which accounts for geometric nonlinearity through the use of corotating element reference frames and nonlinear strain-displacement relations is used to analyze this detailed model. Results from linear analyses using the same finite element model are presented in order to illustrate the advantages and costs of the nonlinear analysis as compared with the more traditional linear analysis.
    Keywords: STRUCTURAL MECHANICS
    Type: In: AHS National Technical Specialists' Meeting on Rotorcraft Structures, Williamsburg, VA, Oct. 29-31, 1991, Proceedings (A93-27951 10-05); 15 p.
    Format: text
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  • 5
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    High-performance equation solvers and their impact on finite element analysis (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The role of equation solvers in modern structural analysis software is described. Direct and iterative equation solvers which exploit vectorization on modern high-performance computer systems are described and compared. The direct solvers are two Cholesky factorization methods. The first method utilizes a novel variable-band data storage format to achieve very high computation rates and the second method uses a sparse data storage format designed to reduce the number od operations. The iterative solvers are preconditioned conjugate gradient methods. Two different preconditioners are included; the first uses a diagonal matrix storage scheme to achieve high computation rates and the second requires a sparse data storage scheme and converges to the solution in fewer iterations that the first. The impact of using all of the equation solvers in a common structural analysis software system is demonstrated by solving several representative structural analysis problems.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal for Numerical Methods in Engineering (ISSN 0029-5981); 33; 855-868
    Format: text
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  • 6
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    Magnetic shielding experiences (1965)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Magnetic shields of Mumetal for magnetometer sensors of Mariner Mars spacecraft
    Keywords: STRUCTURAL MECHANICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Component shielding (1965)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Evaluation of Mumetal shielding for reed switch relays
    Keywords: STRUCTURAL MECHANICS
    Format: text
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  • 8
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    Effect of contact stresses in four-point bend testing of graphite/epoxy and graphite/PMR-15 composite beams (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The results of in-plane four-point bend experiments on unidirectionally reinforced composite beams are presented for graphite/epoxy (T300/934) and graphite/polyimide (G30-500/PMR-15) composites. The maximum load and the location of cracks formed during failure were measured for testpieces with fibers oriented at various angles to the beam axis. Since most of the beams failed near one or more of the load points, the strength of the beams was evaluated in terms of a proposed model for the local stress distribution. In this model, an exact solution to the problem of a localized contact force acting on a unidirectionally reinforced half plane is used to describe the local stress field. The stress singularity at the load points is treated in a manner similar to the stress singularity at a crack tip in fracture mechanisms problems. Using this approach, the effect of fiber angle and elastic material properties on the strength of the beam is described in terms of a load intensity factor. For fiber angles less than 45 deg from the beam axis, a single crack is initiated near one of the load points at a critical value of the load intensity factor. The critical load intensity factor decreases with increasing fiber angle. For larger fiber angles, multiple cracks occur at locations both near and away from the load points, and the load intensity factor at failure increases sharply with increasing fiber angle.
    Keywords: STRUCTURAL MECHANICS
    Type: SAMPE Quarterly (ISSN 0036-0821); 23; 20-28
    Format: text
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  • 9
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    Transmission characteristics of conical and cylindrical shells under lateral excitation. (1968)
    In:  Other Sources
    Details
    Publication Date: 2011-08-12
    Description: Steady state frequency response of conical and cylindrical shells under lateral excitation
    Keywords: STRUCTURAL MECHANICS
    Type: ; YAL SOCIETY (
    Format: text
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  • 10
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    Technology integration box beam failure study (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The objective of this paper is to describe current results from an on-going study of the mechanisms that led to the failure of the TIBB. Experimental and analytical results are presented. Experimental results include load, strain, and deflection data for the TIBB (Technology Integration Box Beam). An analytical investigation was conducted to compliment the experimental investigation and to gain additional insight into the TIBB structural response. Analytical results include strain and deflection results from a global analysis of the TIBB. A local analysis of the failure region is being completed. These analytical results are validated through comparisons with the experimental results from the TIBB tests. The experimental and analytical results from the TIBB tests are used to determine a sequence of events that may have resulted in failure of the TIBB. A potential cause of failure is high stresses in a stiffener runout region. Typical analytical results are presented for a stiffener runout specimen that is being defined to simulate the TIBB failure mechanisms. The results of this study are anticipated to provide better understanding of potential failure mechanisms in composite aircraft structures, to lead to future design improvements, and to identify needed analytical tools for design and analysis.
    Keywords: STRUCTURAL MECHANICS
    Type: FAA, Ninth DOD(NASA)FAA Conference on Fibrous Composites in Structural Design, Volume 2; p 673-68
    Format: application/pdf
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