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  • STRUCTURAL MECHANICS  (13)
  • 1985-1989  (12)
  • 1965-1969  (1)
  • 1945-1949
  • 1
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    Modeling global structural damping in trusses using simple continuum models (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA Journal (ISSN 0001-1452); 24; 144-150
    Format: text
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  • 2
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    A global-local approach to solving vibration of large truss structures (1986)
    In:  Other Sources
    Details
    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
    Format: text
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  • 3
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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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  • 4
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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
    Format: text
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  • 5
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    Smooth indentation of an initially stressed orthotropic beam (1985)
    In:  Other Sources
    Details
    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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  • 6
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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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  • 7
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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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  • 8
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    Orthotropic elasto-plastic behavior of AS4/APC-2 thermoplastic composite in compression (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Uniaxial compression tests were performed on off-axis coupon specimens of unidirectional AS4/APC-2 thermoplastic composite at various temperatures. The elasto-plastic and strength properties of AS4/APC-2 composite were characterized with respect to temperature variation by using a one-parameter orthotropic plasticity model and a one-parameter failure criterion. Experimental results show that the orthotropic plastic behavior can be characterized quite well using the plasticity model, and the matrix-dominant compressive strengths can be predicted very accurately by the one-parameter failure criterion.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-186080 , NAS 1.26:186080 , CML-89-2
    Format: application/pdf
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  • 9
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    Parallel processing techniques for finite element analysis of nonlinear large truss structures (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Methods were developed for parallel processing of finite element solutions of large truss structures. The parallel processing techniques were implemented in two stages, i.e., the repeated forming of the nonlinear global stiffness matrix and the solving of the global system of equations. The Sequent Balance 21000 parallel computer was employed to demonstrate the procedures and the speed-up.
    Keywords: STRUCTURAL MECHANICS
    Type: Computers and Structures (ISSN 0045-7949); 31; 6 19
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  • 10
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    Elastic-plastic crack analysis using a global-local approach on a parallel computer (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A global-local finite-element analysis procedure is employed to solve elastoplastic crack problems. This procedure involves a global analysis using a coarse mesh and the subsequent locally refined analysis of a number of subregions. Parallel computation is involved in the local analyses. Numerical examples are performed on a MIMD parallel computer to demonstrate the time-saving capability of the proposed procedure.
    Keywords: STRUCTURAL MECHANICS
    Type: Computers and Structures (ISSN 0045-7949); 30; 1-2
    Format: text
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