Postbuckling and Collapse Analysis of CFRP Stringer Stiffened Panels – a Garteur Activity

Degenhardt, Richard; Rohwer, K.; Wagner, Werner; Delsemme, Jean-Pierre

doi:10.1201/9781351077309-10

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“…The design of the POSICOSS structures takes the results of the following pre-damaged benchmark, which was tested at DLR, as basis. It was intensively investigated within the GARTEUR SM Action Group 25 "Postbuckling and Collapse Analysis" [5] and at the beginning of the POSICOSS project and will be subsequently detailed.…”

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confidence: 99%

“…Finally, the panel was axially compressed until collapse. Figure 3: Finite element analyses of the undamaged DLR benchmark taken as start design [5] Different commercial and self-developed finite element tools were applied to simulate the behaviour of this panel during loading up to collapse. Linear and nonlinear analyses as well as buckling analyses were performed in order to observe the axial stiffness in the pre-buckling region, the buckling loads of the panel and the structural behaviour in the post-buckling region.…”

Section: Start Designmentioning

confidence: 99%

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Design and Analysis of Composite Panels

Degenhardt¹,

Kling²,

Rohwer³

III European Conference on Computational Mechanics

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European aircraft industry demands for reduced development and operating costs, by 20% and 50% in the short and long term, respectively. Contributions to this aim are provided by the completed project POSICOSS (5 th FP) and the running follow-up project COCOMAT (6 th FP), both supported by the European Commission. As an important contribution to cost reduction a decrease in structural weight can be reached by exploiting considerable reserves in primary fibre composite fuselage structures through an accurate and reliable simulation of postbuckling up to collapse. The POSICOSS team developed fast procedures for postbuckling analysis of stiffened fibre composite panels, created comprehensive experimental data bases and derived design guidelines. COCOMAT builds up on the POSICOSS results and considers in addition the simulation of collapse by taking degradation into account. The results comprise an extended experimental data base, degradation models, improved certification and design tools as well as design guidelines.The projects POSICOSS and COCOMAT develop improved tools which are validated by experimental results obtained during the projects. Because the new tools must consider a wide range of different aspects a lot of different structures had to be tested. These structures were designed under different design objectives. For the design process the consortium applied already available simulation tools and brought in their own design experience. This paper deals with the design process within both projects and the analysis procedure applied within this task. It focuses on the experience of DLR on the design and analysis of stringer stiffened CFRP panels gained in the frame of these projects.

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Section: Start Designmentioning

confidence: 99%

Section: Start Designmentioning

confidence: 99%