Modal Substructuring of Geometrically Nonlinear Finite Element Models with Interface Reduction [electronic resource].

Published:: Arlington, Va. : United States. Air Force. Office of Scientific Research, 2017.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:: pages 1,695-1,706 : digital, PDF file
Additional Creators:: Sandia National Laboratories, United States. Air Force. Office of Scientific Research, United States. National Nuclear Security Administration, and United States. Department of Energy. Office of Scientific and Technical Information

Access Online

www.osti.gov

Availability

Finding items...

Restrictions on Access:

Free-to-read Unrestricted online access

Summary:

Substructuring methods have been widely used in structural dynamics to divide large, complicated finite element models into smaller substructures. For linear systems, many methods have been developed to reduce the subcomponents down to a low order set of equations using a special set of component modes, and these are then assembled to approximate the dynamics of a large scale model. In this paper, a substructuring approach is developed for coupling geometrically nonlinear structures, where each subcomponent is drastically reduced to a low order set of nonlinear equations using a truncated set of fixedinterface and characteristic constraint modes. The method used to extract the coefficients of the nonlinear reduced order model (NLROM) is non-intrusive in that it does not require any modification to the commercial FEA code, but computes the NLROM from the results of several nonlinear static analyses. The NLROMs are then assembled to approximate the nonlinear differential equations of the global assembly. The method is demonstrated on the coupling of two geometrically nonlinear plates with simple supports at all edges. The plates are joined at a continuous interface through the rotational degrees-of-freedom (DOF), and the nonlinear normal modes (NNMs) of the assembled equations are computed to validate the models. The proposed substructuring approach reduces a 12,861 DOF nonlinear finite element model down to only 23 DOF, while still accurately reproducing the first three NNMs of the full order model.

Report Numbers:

E 1.99:sand--2016-2065j
sand--2016-2065j

Subject(s):

Engineering

Other Subject(s):

Note:

Published through SciTech Connect.
03/29/2017.
"sand--2016-2065j"
"619965"
AIAA Journal 55 5 ISSN 0001-1452 AM
Robert J. Kuether; Matthew S. Allen; Joseph J. Hollkamp.

Funding Information:

AC04-94AL85000
FA9550-11-1-0035

View MARC record | catkey: 23767746