TU BRAUNSCHWEIG

Composites

The increasing use of composite materials in automobile, aircraft and wind energy applications, together with the need to stress these structures to a higher level increases the demand to assess the fatigue behaviour.

 

Current projects

DFG-PAK267: Effects of Defects

DFG-SPP1466: Life∞

DFG-SPP1712: Intrinsische Hybridverbunde für Leichtbaustrukturen, Teilprojekt: "Multilayer Inserts" - Intrinsische Hybridverbunde zur Krafteinleitung in dünnwandige Hochleistungs-CFK-Strukturen

DFG-Project: Large scale testing device

DFG-Collaborative Research Center 880: Fundamentals of high lift for future commercial aicraft

 

Completed projects

 


Current projects


DFG-PAK267: Effects of Defects

The Institute of Aircraft Design and Lightweight Structures investigates the influence of defects (such as fibre waviness, distributed or accumulated voids, impacts, ...) on the damage mechanisms and fatigue behaviour of biaxially or sequently loaded composites.

 

selected images of the project "Effects of Defects"

more information about this project

Contact person: R. Greif

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DFG SPP1466: Life∞ - Infinite life cycle for cyclically stressed high-performance materials                

 In the context of the DFG priority programme SPP1466, the IFL carries out research on the fatigue behaviour of fibre-reinforced composites subjected to very high numbers of load cycles. This project is realised in collaboration with the DLR (Prof. Sinapius).Given that VHCF (very high cycle fatigue) studies on standard testing machines require lengthy runs (e.g. 232 days for 108 cycles run at 5 Hz), the focus in the first stage of the project is on the construction of suitable test stations.For this purpose, at the IFL, a high frequency test stand is currently devised for fatigue-testing of glass fibre-reinforced bending specimens. In addition to the development of a test stand, priority is given to the integration and testing of various monitoring systems (thermography, microscopy) for the analysis of damage evolution.

selected images of the project

more information about this project

Contact person: M. Lewandrowski

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DFG-SPP1712

The aim of this research project is to develop an intrinsic hybrid interface and its manufacturing process. The interface is characterized by a load-optimized pinned structure which allows a uniform transfer of loads at the transition metallic structure into highly stressed, complex fiber-plastic composite structures. For this purpose, an intrinsically produced multilayer insert (MLI) is developed. This insert forms a novel interface for this partial structure attachment. The CFRP considered here can be used, for example, in aircraft construction or automotive engineering in the future.

MLI Concept

MLI-Konzept

additional informations regarding the project

and about the research programm SPP1712

Contact person: A. Herwig

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DFG-Project: Large scale testing device

This project is not dedicated to the investigation of a certain phenomenon in fracture mechanics. The goal of this DFG (German Research Foundation)-funded project is morelike the creation of a "universal" platform for the investigation of fracture mechanic phenomena. In cooperation with the Institut für Füge- und Schweißtechnik (Prof Dilger) of the TU Braunschweig and the German Zentrum für Luft- und Raumfahrttechnik (DLR, Prof. Wiedemann), this large scale testing device for fatigue-investigation of FRP- lightweight structures was designed and constructed at the IFL and is about to be ready for testing. Further information can be found following the link below

detailed CAD-view on the test field detailed view of specimen missing
CAD-picture of the testing machine Detailes view of the test-specimen
Further information on the project                  Contact person: T. Fabel
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DFG-Collaborative Research Center 880: Fundamentals of high lift future commercial aircraft 

Project B3 - Contour-variable leading edge

A full analysis of today’s commercial aircrafts has shown a substantial need for high lift devices, which will not be covered by the predominant technology evolution. This is true in particular in the domains of noise reduction and enhanced scalability of the performance parameters of high lift device during take-off and landing.

Within the Collaborative Research Center 880 the aerodynamic Coanda effect is intented to be utilized for high lift. Therefor a highly deflectable flap and a contour-variable leading edge is needed.

In the project B3 the research is focussed on the contour-variable skin of the leading edge, which is characterized by withstanding large strains in morphing direction as well as providing as much stiffness as possible to transfer the aerodynamic loads to the underlying, supporting structure.

 

micrograph droop_nose

Micrograph section of skin sample

           Deflected leading edge

Further information on the project
   

           Contact person: F. Nolte

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Completed projects

Experimental and theoretical investigations of mechanical behaviours of 3D-composites

Fatigue behaviour of 3D-reinforced composites

Crash on composite structures

Delamination growth in composites


  last changed 02.05.2019
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