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  • 1
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    Parameter estimation in truss beams using Timoshenko beam model with damping (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Truss beams with members having viscous damping are modeled with a Timoshenko beam. Procedures for deriving the equivalent bending rigidity, transverse shear rigidity, and damping are presented. Explicit expressions for these equivalent beam properties are obtained for a specific truss beam. The beam model thus established is then used to investigate the effect of damping in free vibration. Finally, the beam is employed in the estimation of structural parameters in a simply-supported truss beam using a random search algorithm.
    Keywords: STRUCTURAL MECHANICS
    Type: JPL Proc. of the Workshop on Appl. of Distributed System Theory to the Control of Large Space Struct.; p 531-545
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  • 2
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    Modeling global structural damping in trusses using simple continuum models (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA Journal (ISSN 0001-1452); 24; 144-150
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  • 3
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    A method for calculating strain energy release rate based on beam theory (1993)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The Timoshenko beam theory was used to model cracked beams and to calculate the total strain energy release rate. The root rotation of the beam segments at the crack tip were estimated based on an approximate 2D elasticity solution. By including the strain energy released due to the root rotations of the beams during crack extension, the strain energy release rate obtained using beam theory agrees very well with the 2D finite element solution. Numerical examples were given for various beam geometries and loading conditions. Comparisons with existing beam models were also given.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 93-1454 , In: AIAA(ASME)ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 34th and AIAA/ASME Adaptive Structures Forum, La Jolla, CA, Apr. 19-22, 1993, Technical Papers. Pt. 3 (A93-33876 1; p. 1310-1318.
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  • 4
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    A global-local approach to solving vibration of large truss structures (1986)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: A global-local approach was proposed to solve dynamic problems involving truss beams. A continuum Timoshenko beam was used to model sections of truss beams wherever possible and accurate. Near applied loads the continuum model was not adequate and detailed truss finite elements (discrete model) were employed. This approach was also proven efficient for an odd-shaped truss structure connected to a truss beam. Between the continuum model and the discrete model, compatibility conditions were derived.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 86-0872
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  • 5
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    Finite expansion of a spherical cavity in a locking medium (1965)
    In:  Other Sources
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    Publication Date: 2019-01-25
    Description: Finite expansion of spherical cavity in locking medium using finite strain theory
    Keywords: STRUCTURAL MECHANICS
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  • 6
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    Bending effects of unsymmetric adhesively bonded composite repairs on cracked aluminum panels (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The bending effects of unsymmetrically bonded composite repairs on cracked aluminum panels were quantified using a plate linear finite element model. Stress intensity factors and strain energy release rates were obtained from the model twice, once with out-of-plane displacement suppressed and another time without these restrictions. Several configurations were examined, crack growth stability was identified, and the effect of a debond was considered. The maximum stress intensity factor was also analyzed. Previous work by other authors was found to underpredict the bending effect.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Research Center, FAA(NASA International Symposium on Advanced Structural Integrity Methods for Airframe Durability and Damage Tolerance; p 33-48
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  • 7
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    Nonlinear transient responses of initially stressed composite plates (1985)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The nonlinear transient response of initially stressed composite plates is investigated using the finite element method. A nine-node isoparametric quadrilateral element is developed to model laminated plates under initial deformation and initial stress according to the Mindlin plate theory and von Karman large deflection assumptions. In the time integration, the Newmark constant acceleration method in conjunction with an efficient and accurate iteration scheme is used. Numerical results for deflections and bending moments for isotropic and laminated plates are obtained.
    Keywords: STRUCTURAL MECHANICS
    Type: Computers and Structures (ISSN 0045-7949); 21; 3 19
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  • 8
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    Smooth indentation of an initially stressed orthotropic beam (1985)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The contact behavior between a smooth rigid cylinder and a simply supported orthotropic beam under uniaxial initial stresses is studied. The displacements are computed by superposing Mindlin plate solution with the solution obtained from Biot's theory of incremental deformation. Finite Fourier transforms are used in solving the equations. A point matching technique is used to compute the contact stresses and the amount of indentation for a given contact length. The effects of orthotropy and initial stresses on the contact stress distribution are investigated. An indentation law is established from the numerical results.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal of Solids and Structures (ISSN 0020-7683); 21; 2 19
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  • 9
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    Dynamic large deflection response of composite laminates subjected to impact (1985)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Impact responses of composite laminates with and without initial stresses are investigated using the finite element method. A nine-node isoparametric quadrilateral element based on the Mindlin plate theory and the von Karman large deflection assumptions is developed. An experimentally established contact law which accounts for the permanent indentation is incorporated into the finite element program to evaluate the impact force. In the time integration, the Newmark constant acceleration algorithm is used in conjunction with successive iterations within each time step. Numerical results, including the contact force histories, deflections and strains in the plate, are presented.
    Keywords: STRUCTURAL MECHANICS
    Type: Composite Structures (ISSN 0263-8223); 4; 1 19
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  • 10
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    An efficient numerical algorithm for transverse impact problems (1985)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Transverse impact problems in which the elastic and plastic indentation effects are considered, involve a nonlinear integral equation for the contact force, which, in practice, is usually solved by an iterative scheme with small increments in time. In this paper, a numerical method is proposed wherein the iterations of the nonlinear problem are separated from the structural response computations. This makes the numerical procedures much simpler and also efficient. The proposed method is applied to some impact problems for which solutions are available, and they are found to be in good agreement. The effect of the magnitude of time increment on the results is also discussed.
    Keywords: STRUCTURAL MECHANICS
    Type: Computers and Structures (ISSN 0045-7949); 20; 6 19
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