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Metamodeling methodology for postbuckling simulation of Damaged composite stiffened structures with physical validation

Kalnins, Kaspars and Rikards, Rolands and Auzins, Janis and Bisagni, Chiara and Abramovich, Haim and Degenhardt, Richard (2010) Metamodeling methodology for postbuckling simulation of Damaged composite stiffened structures with physical validation. International Journal of Structural Stability and Dynammics, 10 (4), pp. 705-717. Imperial College Press. ISSN 0219-4554.

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Abstract

A metamodeling methodology has been proposed for postbuckling simulation of stiffened composite structures with integrated degradation scenarios. The presence of artificial damage in between the outer skin and stiffeners has been simulated as softening of the material properties in predetermined regions in the structure. The proposed methodology for the fast design procedure of axially or torsionally loaded stiffened composite structures is based on response surface methodology (RSM) and design and analysis of computer experiments (DACE). Numerical analyses have been parametrically sampled by means of ANSYS/LS-DYNA probabilistic design toolbox extracting the load-shortening response curves in the preselected domain of interest. These response curves have been simplified using piece-wise linear approximation identifying the buckling and postbuckling stiffness ratios along with the values of the skin and the stiffener buckling loads. Three stiffened panel designs and a closed box structure with preselected damage scenarios have been elaborated and validated with the tests performed within the COCOMAT project. The resulting design procedure provides a time effective design tool for preliminary study and for elaboration of the optimum design guidelines of composite stiffened structures with material degradation restraints.

Document Type:Article
Title:Metamodeling methodology for postbuckling simulation of Damaged composite stiffened structures with physical validation
Authors:
AuthorsInstitution or Email of Authors
Kalnins, KasparsInstitute of Materials and Structures, Riga Technical University, Latvia
Rikards, RolandsInstitute of Materials and Structures, Riga Technical University, Latvia
Auzins, JanisInstitute of Materials and Structures, Riga Technical University, Latvia
Bisagni, ChiaraDepartment of Aerospace Engineering, Politecnico di Milano, Italy
Abramovich, HaimFaculty of Aerospace Engineering, Technion, I.I.T., Haifa, Israel
Degenhardt, RichardUNSPECIFIED
Date:October 2010
Journal or Publication Title:International Journal of Structural Stability and Dynammics
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:10
Page Range:pp. 705-717
Editors:
EditorsEmail
Yang, Y.B.National Tauwan University
Wang, C.M.National University of Singapore
Reddy, J.N.Texas A&M University
Degenhardt, RichardDLR, Guest Editor
Publisher:Imperial College Press
Series Name:International Journal of Structural Stability and Dynamics
ISSN:0219-4554
Status:Published
Keywords:Metamodeling; postbuckling; stiffened structures; physical validation; structural degradation; design of computer experiments; fast design procedure
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures & Materials
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Structural Mechanics
Deposited By: Doris Ries
Deposited On:01 Sep 2010 11:35
Last Modified:07 Feb 2013 19:42

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