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  • 1
    Electronic Resource
    Electronic Resource
    A coupled analysis method for structures with independently modelled finite element subdomains (1995)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 38 (1995), S. 3695-3718 
    Details
    ISSN: 0029-5981
    Keywords: plates ; shells ; subdomain coupling ; finite element ; global/local ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A new method for analysing plate and shell structures with two or more independently modelled finite element subdomains is presented, assessed, and demonstrated. This method provides a means of coupling local and global finite element models whose nodes do not coincide along their common interface. In general, the method provides a means of coupling structural components (e.g., wing and fuselage) which may have been modelled by different analysts. In both cases, the need for transition modelling, which is often tedious and complicated, is eliminated. The coupling is accomplished through an interface for which three formulations are considered and presented. These formulations are: collocation, discrete least-squares, and hybrid variational. Several benchmark problems are analysed and it is shown that the hybrid variational formulation provides the most accurate solutions.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620382109
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    Paper (German National Licenses)
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  • 2
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    A generic interface element for COMET-AR (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The implementation of an interface element capability within the COMET-AR software system is described. The report is intended for use by both users of currently implemented interface elements and developers of new interface element formulations. Guidance on the use of COMET-AR is given. A glossary is provided as an Appendix to this report for readers unfamiliar with the jargon of COMET-AR. A summary of the currently implemented interface element formulation is presented in Section 7.3 of this report.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-195075 , NAS 1.26:195075
    Format: application/pdf
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  • 3
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    A global/local analysis method for treating details in structural design (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A method for analyzing global/local behavior of plate and shell structures is described. In this approach, a detailed finite element model of the local region is incorporated within a coarser global finite element model. The local model need not be nodally compatible (i.e., need not have a one-to-one nodal correspondence) with the global model at their common boundary; therefore, the two models may be constructed independently. The nodal incompatibility of the models is accounted for by introducing appropriate constraint conditions into the potential energy in a hybrid variational formulation. The primary advantage of this method is that the need for transition modeling between global and local models is eliminated. Eliminating transition modeling has two benefits. First, modeling efforts are reduced since tedious and complex transitioning need not be performed. Second, errors due to the mesh distortion, often unavoidable in mesh transitioning, are minimized by avoiding distorted elements beyond what is needed to represent the geometry of the component. The method is applied reduced to a plate loaded in tension and transverse bending. The plate has a central hole, and various hole sixes and shapes are studied. The method is also applied to a composite laminated fuselage panel with a crack emanating from a window in the panel. While this method is applied herein to global/local problems, it is also applicable to the coupled analysis of independently modeled components as well as adaptive refinement.
    Keywords: STRUCTURAL MECHANICS
    Type: Third NASA Advanced Composites Technology Conference, Volume 1, Part 2; p 967-986
    Format: application/pdf
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  • 4
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    Computational methods for global/local analysis (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Computational methods for global/local analysis of structures which include both uncoupled and coupled methods are described. In addition, global/local analysis methodology for automatic refinement of incompatible global and local finite element models is developed. Representative structural analysis problems are presented to demonstrate the global/local analysis methods.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-107591 , NAS 1.15:107591
    Format: application/pdf
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  • 5
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    Large-scale structural analysis: The structural analyst, the CSM Testbed and the NAS System (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Computational Structural Mechanics (CSM) activity is developing advanced structural analysis and computational methods that exploit high-performance computers. Methods are developed in the framework of the CSM testbed software system and applied to representative complex structural analysis problems from the aerospace industry. An overview of the CSM testbed methods development environment is presented and some numerical methods developed on a CRAY-2 are described. Selected application studies performed on the NAS CRAY-2 are also summarized.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-100643 , NAS 1.15:100643
    Format: application/pdf
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  • 6
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    CSM Testbed Development and Large-Scale Structural Applications (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A research activity called Computational Structural Mechanics (CSM) conducted at the NASA Langley Research Center is described. This activity is developing advanced structural analysis and computational methods that exploit high-performance computers. Methods are developed in the framework of the CSM Testbed software system and applied to representative complex structural analysis problems from the aerospace industry. An overview of the CSM Testbed methods development environment is presented and some new numerical methods developed on a CRAY-2 are described. Selected application studies performed on the NAS CRAY-2 are also summarized.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-4072 , L-16499 , NAS 1.15:4072
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  • 7
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    A new interface element for connecting independently modeled substructures (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A new interface element based on the hybrid variational formulation is presented and demonstrated. The element provides a means of connecting independently modeled substructures whose nodes along the common boundary need not be coincident. The interface element extends previous work to include connecting an arbitrary number of substructures, the use of closed and generally curved interfaces, and the use of multiple, possibly nested, interfaces. Several applications of the element are presented and aspects of the implementation are discussed.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 93-1503 , 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. 1693-1703.
    Format: text
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  • 8
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    Error detection and control for nonlinear shell analysis (1990)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A problem-adaptive solution procedure for improving the reliability of finite element solutions to geometrically nonlinear shell-type problem is presented. The strategy incorporates automatic error detection and control and includes an iterative procedure which utilizes the solution at the same load step on a more refined model. Representative nonlinear shell problem are solved.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-102723 , NAS 1.15:102723 , World Congress on Finite Element Methods; Oct 01, 1990 - Oct 05, 1990; Banff, Alberta; Canada
    Format: application/pdf
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