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Cyclic buckling tests of pre-damaged CFRP stringer stiffened panels

Wilckens, Dirk and Degenhardt, Richard and Rohwer, Klaus and Zimmermann, Rolf and Kepke, Markus and Hildebrandt, Bernd and Zipfel, Ary (2010) Cyclic buckling tests of pre-damaged CFRP stringer stiffened panels. International Journal of Structural Stability and Dynammics, 10 (4), pp. 827-853. World Scientific Publishing Co. ISSN 0219-4554

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Abstract

Experimental results obtained from cyclic buckling and post buckling tests of pre-damaged stiffened CFRP panels are described in this paper. This work was conducted within the COCOMAT project funded by the EU with the objective to contribute to the reduction of structural weight at safe design. COCOMAT targeted to establish a new design scenario for composite stiffened panels which are understood as part of an aircraft fuselage. This design scenario aimed at exploiting considerable reserve carrying capacities in fibre composite fuselage structures by accurate simulation of collapse. The project results cover an experimental data base, improved slow and fast computational tools as well as design guidelines. A reliable simulation of the collapse load requires taking degradation into account. For the validation of the tools, a sound database of experiments is needed which give information about the progress of damage during the loading process. In this context, the present paper focuses on the investigation on pre-damaged stringer stiffened panels under cyclic axial compression. A set of four panels of the same design was split in two variants which only differ in the position of an artificial Teflon disbond beneath a stringer. One of each variant has been tested statically until collapse in one step as reference while the remaining panel was tested cyclically with different amplitudes. Before the test, all test structures were assessed by ultrasonic inspection and the geometric imperfections were measured. During the test, advanced measurement systems such as the ARAMIS system for the measurement of the buckling pattern and thermography for monitoring the skin-stringer separation are utilized in addition to strain gauge measurements and the record of the load shortening data. The test structures, their preparations for testing, the buckling test facility, and the measurement systems used are described. The test results as to the influence of the cyclic loading on the damage progression in the skin-stringer connection are presented and discussed.

Item URL in elib:https://elib.dlr.de/65139/
Document Type:Article
Title:Cyclic buckling tests of pre-damaged CFRP stringer stiffened panels
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wilckens, DirkUNSPECIFIEDUNSPECIFIED
Degenhardt, RichardUNSPECIFIEDUNSPECIFIED
Rohwer, KlausUNSPECIFIEDUNSPECIFIED
Zimmermann, RolfUNSPECIFIEDUNSPECIFIED
Kepke, MarkusUNSPECIFIEDUNSPECIFIED
Hildebrandt, BerndUNSPECIFIEDUNSPECIFIED
Zipfel, AryUNSPECIFIEDUNSPECIFIED
Date:October 2010
Journal or Publication Title:International Journal of Structural Stability and Dynammics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:10
Page Range:pp. 827-853
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:World Scientific Publishing Co
Series Name:International Journal of Structural Stability and Dynamics
ISSN:0219-4554
Status:Published
Keywords:stability, tests, composite structures, buckling, post buckling, collapse, skin-stringer separation, degradation, cyclic loading, pre-damage
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures & Materials (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Structural Mechanics
Deposited By: Ries, Doris
Deposited On:01 Sep 2010 11:26
Last Modified:06 Sep 2019 15:26

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