The lighter an aircraft is, the less fuel it consumes. Given the need to cut carbon dioxide emissions, this is a key aspect of materials research. Aircraft manufacturers are therefore pinning their hopes on particularly lightweight construction materials.
These include not only lightweight metals, but also fiber composite plastics, particularly carbon-fiber reinforced plastics (CFRPs). Whenever two CFRP components have to be joined together, this has so far been accomplished primarily by riveting.
Researchers at the Fraunhofer Institute for Manufacturing Technology and Applied Materials Research IFAM in Bremen are experts in adhesive techniques and plan to enlarge their expertise to include mechanical joining. At the Composites Europe trade fair in Essen from September 23 through 25, 2008, they will be presenting a state-of-the-art C-clamp riveting machine (Hall 10-11, Stand 150). This device enables the necessary rivet holes, complete with one- or two-part riveted bolts, to be installed accurately and automatically in compliance with aviation standards.
The IFAM researchers now intend to go a step further. “Rivet holes are a problem, particularly in CFRP structures,” explains Dr. Oliver Klapp of the IFAM. “They disturb the flow of forces in the CFRP structures and reduce the load-bearing capacity of the material.” The researchers are therefore planning to make use of adhesive bonding processes that are already employed for CFRP materials. “But the aviation industry is not yet ready to rely exclusively on bonded components and assemblies,” says Klapp.
This is why the engineers are exploring the potential of hybrid joining – a combination of riveting and a special bonding process. The advantages of hybrid joining are obvious: the CFRP materials are not riddled with so many rivet holes. The particularly high load-bearing capacity of these materials is more effectively brought to bear in the truest sense of the word, because bonding results in a more effective, all-over distribution of forces. The researchers are currently optimizing the parameters of the joining process.
“It’s true that riveting will not be eliminated from aircraft construction in the next several years,” says Klapp. But the aviation industry will soon be unable to manage without structural bonding of primary structures such as the airframe, the wings and the tail units.
Dr. Oliver Klapp | Fraunhofer-Gesellschaft
Scientist invents way to trigger artificial photosynthesis to clean air
26.04.2017 | University of Central Florida
Researchers invent process to make sustainable rubber, plastics
25.04.2017 | University of Delaware
More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.
Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...
Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.
"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...
The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
20.04.2017 | Event News
18.04.2017 | Event News
03.04.2017 | Event News
26.04.2017 | Materials Sciences
26.04.2017 | Agricultural and Forestry Science
26.04.2017 | Physics and Astronomy