An analysis methodology for failure in postbuckling skin-stiffener interfaces (2008)
Orifici, Adrian, Thomson, R.S., Herszberg, I., Weller, T., Degenhardt, Richard, Bayandor, J.
Blade-stiffened structures have the potential to produce highly efficient structures, particularly when the large strength reserves available after structural buckling, in the postbuckling range, are...
Degenhardt, Richard, Teßmer, Jan, Kling, Alexander
Concepts and tools for testing, fast and reliable simulation of buckling and postbuckling behavior of thin-walled aircraft structures up to collapse are milestones for reducing industrial development...
CHALLENGES IN THE DESIGN OF FUTURE STRUCTURES MADE OF CFRP (2008)
The aircraft industry demands for reduced development and operating costs, by 20% and 50% in the short and long term, respectively. Structural weight reduction by exploitation of structural reserves...
Silva, N.M., Degenhardt, Richard, Camotim, D., Silvestre, N.
The paper presents the application of a novel fast numerical tool, based on Generalised Beam Theory (GBT), to perform buckling and post-buckling analyses of laminated CFRP panels. GBT is a beam...
A stochastic study on the robustness of a stiffened composite structure (2008)
Lee, M., Thomsen, R., Degenhardt, Richard, Kelly, D.W.
COCOMAT is an ongoing four year European Commission project aimed at exploiting the large reserve of strength in composite structures through more accurate prediction of collapse. As part of the...
The influence of imperfections on the buckling behavior of unstiffened CFRP-cylinders (2008)
Orf, Jana, Degenhardt, Richard, Bethge, Arne, Kärger, Luise
The objective of this work was the investigation of several imperfections concerning their influence on the buckling behaviour of thin-walled circular cylindrical CFRP (carbon fibre reinforce...
Steinmüller, Patrick, Degenhardt, Richard, Rohwer, Klaus
At the DLR, a new method to determine buckling loads of imperfect shells has been developed using a perturbation energy. Applying this technique, only one numerical buckling analysis containing the...
An analysis tool for design and certification of postbuckling composite aerospace structures (2008)
Orifici, Adrian, Thomson, R.S., Degenhardt, Richard
An experimental and numerical investigation was performed into the damage mechanisms and failure loads in skinstiffener sections. In the experimental investigation, thin strips consisting of a skin...
Overview of slow computational and fast simulation tools developed during the project COCOMAT (2008)
Rikards, R., Kalnins, K., Degenhardt, Richard
The paper overviews the progress achieved by the European Commission funded project COCOMAT1 work package devoted to the development of improved simulation procedures for collapse of composite...
Degenhardt, Richard, Wilckens, Dirk, Klein, Herrmann, Kling, Alexander, Hillger, Wolfgang, Goetting, Hans Christian, ...
The aircraft industry strives for significantly reduced development and operating costs. Reduction of structural weight at safe design is one possibility to reach this objective which is aimed by the...
Design and Analysis of Stiffened Composite Panels Including Postbuckling and Collapse (2008)
Degenhardt, Richard, Kling, Alexander, Rohwer, Klaus, Orifici, A., Thomson, R.S.
he European aircraft industry demands 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...
Degenhardt, Richard, Rohwer, Klaus, Wilckens, Dirk, Teßmer, Jan
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...
Wilckens, Dirk, Degenhardt, Richard, Kepke, Markus, Hildebrandt, Bernd, Rohwer, Klaus, Teßmer, Jan, ...
Degradation investigation in a postbuckling composite stiffened fuselage Panel (2008)
Orifici, Adrian, Thomson, R.S., Degenhardt, Richard, Kling, Alexander, Rohwer, Klaus, Bayandor, J.
COCOMAT is a four-year project under the European Commission 6th Framework Programme that aims to exploit the large strength reserves of composite structures through a more accurate prediction of...
Schlussbericht KRAFT Versagenskriterien und Analyse von Faserverbund-Rumpf-Tragwerken (2007)
Aschenbrenner, Lars, Baaran, Jens, Degenhardt, Richard, Kärger, Luise, Temmen, Hubert, Teßmer, Jan, ...
Probabilistic approach for improved buckling knock-down factors of CFRP cylindrical shells (2007)
Degenhardt, Richard, Bethge, Arne, Kling, Alexander, Zimmermann, Rolf, Rohwer, Klaus, Teßmer, Jan, ...
Aerospace industry demands for significantly reduced development and operating costs. Reduction of structural weight at safe design is one avenue to achieve this objective. The running ESA (European...
Degenhardt, Richard, Kling, Alexander, Hillger, Wolfgang, Goetting, Hans Christian, Zimmermann, Rolf, Rohwer, Klaus, ...
The aircraft and space industry strives for significantly reduced development and operating costs. Reduction of structural weight at safe design is one possibility to reach this objective which is...
Degenhardt, Richard, Bethge, Arne, Rohwer, Klaus, Zimmermann, Rolf, Kling, Alexander
The industry in the fields of civil and mechanical engineering, and in particular of aerospace demands for significantly reduced development and operating costs. Reduction of structural weight at...
Simulating Postbuckling Behaviour and Collapse of Stiffened CFRP Panels (2007)
Rohwer, Klaus, Degenhardt, Richard
Advanced composite materials are well known for their outstanding potential in weight-related stiffness and strength leading to an ever increasing share in aerospace structural components out of...
Tailored Fibre Placement Technology – Optimisation and computation of CFRP structures (2007)
Aschenbrenner, Lars, Temmen, Hubert, Degenhardt, Richard
Recent Developments of the Tailored Fibre Placement Technology have shown strong potentials of reducing structural weight by optimised mechanical utilisation of roving cross sections. The...
New Achievements in Stability of Composite Airframe Structures (2007)
Degenhardt, Richard, Teßmer, Jan
European aircraft industry demands for reduced development and operating costs, by 20% and 50% in the short and long term, respectively. Structural weight reduction by exploitation of structural...
New Achievements in Stability of Composite Airframe Structures (2007)
Degenhardt, Richard, Teßmer, Jan
European aircraft industry demands for reduced development and operating costs, by 20% and 50% in the short and long term, respectively. Structural weight reduction by exploitation of structural...
Development of a Finite Element Methodology for Modelling Mixed-Mode Delamination Growth (2007)
Orifici, Adrian, Thomson, R.S., Degenhardt, Richard, Büsing, S., Bayandor, J.
A critical failure mechanism for composite skin-stiffened structures in compression is separation of the skin and stiffener, which can be considered analogous to interlaminar cracking. This paper...
Orifici, Adrian, Thomson, R.S., Degenhardt, Richard, Bisagni, C., Bayandor, J.
Analysing the collapse of skin-stiffened structures requires capturing the critical phenomenon of skin-stiffener separation, which can be considered analogous to interlaminar cracking. This paper...
Design and Analysis of Stiffened Composite Panels Including Postbuckling and Collapse (2007)
Degenhardt, Richard, Kling, Alexander, Rohwer, Klaus, Orifici, A., Thomson, R.S.
The European aircraft industry demands 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...
Bethge, Arne, Degenhardt, Richard
In der Luft- und Raumfahrt wird ein besonderes Augenmerk auf die Optimierung der Struktur gelegt. Vor allen Dingen spielt die Minimierung des Strukturgewichtes aus ökonomischen Gründen eine große...
Orifici, Adrian, Thomson, R.S., Degenhardt, Richard, Bisagni, C., Bayandor, J.
Analysing the collapse of skin-stiffened structures requires capturing the critical phenomenon of skin-stiffener separation, which can be considered analogous to interlaminar cracking. This paper...
Simulation of stringer stiffened CFRP panels in consideration of skin-stringer separation (2006)
Winzen, Andrea, Degenhardt, Richard
The first main focus of this work was to improve and investigate the sensitivity to various parameters of previously developed user subroutines for the finite element (FE) tool ABAQUS/Standard...
Design and Analysis of Composite Panels (2006)
Degenhardt, Richard, Kling, Alexander, Rohwer, Klaus
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...
Orifici, Adrian C., Thomson, Rodney S., Degenhardt, Richard, Bisagni, Chiara, Bayandor, Javid
For stiffened structures in compression the most critical damage mechanism leading to structural collapse is delamination or adhesive disbonding between the skin and stiffener. This paper presents...
Future Design for Composite Airframe Structures – The Projects POSICOSS and COCOMAT (2006)
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...
Advances in Computational Stability Analysis of Composite Aerospace Structures (2005)
Degenhardt, Richard, Teßmer, Jan
European aircraft industry demands for reduced development and operating costs, by 20% and 50% in the short and long term, respectively. Structural weight reduction by exploitation of structural...
Degradation investigation in a postbuckling composite stiffened fuselage panel (2005)
Orifici, Adrian, Thomson, R.S., Degenhardt, Richard, Kling, Alexander, Rohwer, Klaus, Bayandor, J.
The European Commission Project COCOMAT (Improved MATerial Exploitation at Safe Design of COmposite Airframe Structures by Accurate Simulation of COllapse) is a currently running four-year project...
Numerical Finite-Element-Analysis of degradation in stiffened CFRP panels (2005)
Degenhardt, Richard, Reinsch, A.
The main focus of this degree dissertation was to improve the finite element (FE) tool ABAQUS/Standard (ABAQUS) by writing user subroutines to simulate the degradation of an adhesive between a skin...
Nichtlineare Tragwerksanalyse axial gedrückter, versteifter CFK-Paneele (2005)
Degenhardt, Richard, Kling, Alexander, Schuster, K.
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Entwicklung von axial gedrückten, versteiften CFK-Paneelen unter Schädigungsaspekten (2005)
Kling, Alexander, Degenhardt, Richard, Römelt, P.
The aim of this work is to create two panels, which show a significant postbuckling region as well as an early material failure. Those panels will be the used in further investigations of the...
Araújo, F.C., Silva, K.I., Degenhardt, Richard
Recently, some improvements of the generic BE/BE coupling algorithm based on Krylov's solvers, proposed by the first author of this paper and outlined in previous papers, were carried out by...
Degenhardt, Richard, Zimmermann, Rolf, Rolfes, Raimund, Rohwer, Klaus
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...
Benchmark Finite Element Simulations of Postbuckling Composite Stiffened Panels (2005)
Orifici, Adrian, Thomson, R., Gunnion, A.J., Degenhardt, Richard, Abramovich, H., Bayandor, J.
This paper outlines the CRC-ACS contribution to a software code benchmarking exercise as part of the European Commission Project COCOMAT investigating composite postbuckling stiffened panels....
Degenhardt, Richard, Delsemme, Jean-Pierre
Tthis paper will presents main results of post-buckling analyses led during the activity of the GARTEUR action group. A CFRP curved stringer stiffened panel under axial compression has been studied....
Einfluss lokaler Effekte auf das Tragverhalten von Flugzeugrümpfen (2004)
Degenhardt, Richard, Grünwald, A.
Einfluss lokaler Effekte auf das Tragverhalten von Flugzeugrümpfen
FE-Simulation von axial gedrückten, versteiften CFK-Paneelen (2004)
Degenhardt, Richard, Funke, P.
FE-Simulation von axial gedrückten, versteiften CFK-Paneelen
Auslegung von axial gedrückten, versteiften Paneelen (2004)
Degenhardt, Richard, Kling, Alexander, Hansen, L.
In dieser Arbeit wurden zwei axial gedrückte, gekrümmte, stringerversteifte Paneele aus kohlefaserverstärktem Kunststoff entworfen, bei denen ein Versagen der Klebschicht zwischen Paneelhaut und...
New design tools for lightweight aerospace structures (2004)
Rolfes, Raimund, Teßmer, Jan, Degenhardt, Richard, Temmen, Hubert, Bürmann, Philipp, Juhasz, Janos
This paper presents two new design tools for lightweight aerospace structures. The first tool is the Tailored Fibre Placement (TFP) design tool TACO. It is used to optimize the fibre orientations of...
Postbuckling Analysis of CFRP Stringer Stiffened Panels - Development of a fast Design Tool (2004)
Kling, Alexander, Degenhardt, Richard, Zimmermann, Rolf
Development of fast and reliable software for simulation of postbuckling behaviour of stringer stiffened fiber composite panels
FE-Simulation eines axial gedrückten, versteiften CFK-Paneels (2003)
Degenhardt, Richard, Kling, Alexander, Mündel, J.
In der Luft- und Raumfahrt ist es aus wirtschaftlichen, aber auch aus ökologischen Gründen wichtig, das Strukturgewicht zu minimieren. Diese Reduzierung des Eigengewichtes dient in erster Linie...
Virtual Testing of Aircraft Structures, considering Postcritical and Thermal Behavior (2003)
Tessmer, Jan, Degenhardt, Richard, Kling, Alexander, Rolfes, Raimund, Spröwitz, Tom, Waitz, Stefan
Virtual Testing of Aircraft Structures, considering Postcritical and Thermal Behavior
Nichtlineare dynamische Bauwerksprobleme und Interaktion mit dem Baugrund / (1996)
Braunschweig, Techn. Universiẗat, Diss., 1996.