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  • 1
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    Postbuckling analysis using a general-purpose code (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA Journal (ISSN 0001-1452); 24; 1013-102
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Enhancements to the STAGS computer code (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The power of the STAGS family of programs was greatly enhanced. Members of the family include STAGS-C1 and RRSYS. As a result of improvements implemented, it is now possible to address the full collapse of a structural system, up to and beyond critical points where its resistance to the applied loads vanishes or suddenly changes. This also includes the important class of problems where a multiplicity of solutions exists at a given point (bifurcation), and where until now no solution could be obtained along any alternate (secondary) load path with any standard production finite element code.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-4000 , NAS 1.26:4000 , LMSC-D060755
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Nonlinear finite element analysis: An alternative formulation (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A geometrical nonlinear analysis based on an alternative definition of strain is presented. Expressions for strain are obtained by computing the change in length of the base vectors in the curvilinear element coordinate system. The isoparametric element formulation is assumed in the global Cartesian coordinate system. The approach is based on the minimization of the strain energy, and the resulting nonlinear equations are solved by the modified Newton method. Integration of the first and second variation of the strain energy is performed numerically in the case of two and three dimensional elements. Application is made to a simple long cantilever beam.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Research Center Res. in Nonlinear Struct. and Solid Mech.; p 251-261
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Use of global functions for improvement in efficiency of nonlinear analysis (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A method for improving the efficiency of nonlinear structural analysis by the use of global displacement functions is presented. The computer programs include options to define the global functions as input or let the program automatically select and update these functions. The program was applied to a number of structures: (1) 'pear-shaped cylinder' in compression, (2) bending of a long cylinder, (3) spherical shell subjected to point force, (4) panel with initial imperfections, (5) cylinder with cutouts. The sample cases indicate the usefulness of the procedure in the solution of nonlinear structural shell problems by the finite element method. It is concluded that the use of global functions for extrapolation will lead to savings in computer time.
    Keywords: NUMERICAL ANALYSIS
    Type: AIAA PAPER 81-0575 , Conference on Structures, Structural Dynamics and Materials; Apr 06, 1981 - Apr 08, 1981; Atlanta, GA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Postbuckling analysis using a general purpose code (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A new capability for solving postbuckling problems in shell structures is described. The matrix theory to adapt Newton's method to nonlinear finite element shell analysis is outlined first. The matrix theory is directed at writing consistent linear algebratic equations for problems where the tangent stiffness matrix is singular or nearly singular. The matrix theory suggests a change of variables as part of the usual iterative procedure in Newton's method. The change of variables is shown to be feasible for introduction into the algorithm programmed in general purpose codes for finite element analysis of structures. Numerical results from a new option that has been programmed in an existing general purpose code are presented. The analysis of shell structures for collapse and for branching at bifurcation loads is illustrated by the numerical examples.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 85-0719 , Structures, Structural Dynamics, and Materials Conference; Apr 15, 1985 - Apr 17, 1985; Orlando, FL
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
    Electronic Resource
    Electronic Resource
    ASTRID: Structured finite element and finite volume programs adapted to parallel vectorcomputers
    Amsterdam : Elsevier
    Computer Physics Reports 11 (1989), S. 81-116 
    Details
    ISSN: 0167-7977
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Computer Science , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0167-7977(89)90019-1
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    Paper (German National Licenses)
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