Refine
Year of publication
Document Type
- Conference Proceeding (31)
- Article (15)
- Other Publications (7)
- Working Paper (5)
- Book (2)
- Part of a Book (1)
Language
- English (31)
- German (29)
- Multiple languages (1)
Keywords
- Abrasive grain material (1)
- Abwasserreinigung (1)
- Actuators (1)
- Adaptive Steuerung (1)
- Additive manufacturing (1)
- Aktor (1)
- Aktuatorik (1)
- Anhaftung (1)
- Aquaculture (1)
- Aufsatzsammlung (1)
This paper presents the current state of development and selected technological challenges in the application of ecologically and economically sustainable nets for aquaculture based on ongoing development projects. These aim at the development of a new material system of high-strength stainless steel wires as net material with environmentally compatible antifouling properties for nearshore and offshore aquacultures. Current plastic netting materials will be replaced with high-strength stainless steel to provide a more environmentally friendly system that can withstand more severe mechanical stresses (waves, storms, tides and predators). A new antifouling strategy is expected to solve current challenges, such as ecological damage (e.g., due to pollution from copper-containing antifouling substances or microplastics), high maintenance costs (e.g., cleaning and repairs), and shorter service life. Approaches for the next development steps are presented based on previous experience as well as calculation models based on this experience.
Pitting susceptibility of metastable austenitic stainless steels as a function of surface conditions
(2019)
The influence of surface roughness and local defects on pitting susceptibility of type 304 (UNS S30400) and type 301 (UNS S30100) in chloride solution were investigated. Because the mechanical properties can be regarded as decisive for the achieved surface quality, different properties of the base material were obtained by cold rolling the metastable austenites. This was done before the surfaces were finished. Therefor the surfaces were treated by different grinding parameters to generate different surface conditions and different defects. As a reference, different standardised surface finishes were used.
By using and comparing different methods for the characterization of surface roughness and surface texture, it is possible to find a relationship between the quantity and characteristics of local defects on the one hand and pitting susceptibility on the other hand. For the machining parameters used, a ranking of the influencing factors on the corrosion resistance achieved could be determined.
The automated application of software-based solutions for estimating the pitting susceptibility of machined surfaces and components will be discussed using concrete examples.
In the automotive industry a strong effort has been undertaken to reduce the weight of modern vehicles. In order to reduce the energy consumption and to improve the environmental sustainability, the importance of weight reduction activities is even growing faster. As lightweight designing is becoming more and more expensive and show less potential savings, new approaches are needed. One promising technology could be the use of shape memory elements. In the last years a lot of potential application possibilities were presented, demonstrating the benefit of these functional elements in automotive design solutions: they often reduce complexity, weight and design space of an actuation device and enable new functions. In addition they work silently and are therefore ideally suitable for comfort applications in the passenger cabin. Because of the current trend to electric vehicle the hitherto existing drawback of a high electrical energy consumption of shape memory actuators in some design proposals is not given any more.
Rostfreie Stähle
(2016)
Das Buch gibt einen Überblick über die metallkundlichen Grundlagen auf dem Gebiet der nichtrostenden Stähle und über das Einsatzverhalten dieser Werkstoffe. Es werden die notwendigen Hinweise für den Konstrukteur und den Verarbeiter von nichtrostenden Stählen gegeben. Einen Schwerpunkt stellt hierbei das Korrosionsverhalten dieser Werkstoffe dar.
Schlussbericht Verbundprojekt "Verfahren zur Schwermetallelimination in sauren Beizabwässern"
(2003)
Im Vorhaben zur "Schwermetallelimination aus sauren Beizabwässern" sollen zwei 2-stufige Laborreaktoren aufgebaut und betrieben werden, um in diesem Maßstab, die zur Reinigung der Abwässer notwendigen mikrobiologischen, physikalisch-chemischen und biophysikalischen Prozesse zu optimieren. Schadstoffabbau, Schwermetallausfällung und Biosorption wurden in einem Durchflusssystem so aufeinander abgestimmt, daß bei minimaler Verweilzeit die mikrobiellen Umsetzungen von Nitrat zu molekularem Stickstoff (Denitrifikation) und von Sulfat zu Sulfid (Sulfatreduktion) ablaufen und dabei die Schwermetalle als Hydroxide, Carbonate oder Sulfide effizient ausgefällt werden. Dabei muß außerdem die Versorgung der Mikroorganismen durch eine eigene Kohlenstoff- und Energiequelle gewährleistet sein. Die auf der Laborreaktorebene gewonnenen Erkenntnisse sollten dann in den Technikumsmaßstab (100 1) übertragen werden. Nach der Erprobung dieser Anlage im Dauerbetrieb und Ausweitung der gewonnenen Erfährungen sollte eine industrielle Anlage (300 1) konzipiert werden. Als erstes Ziel war ein Nitratabbau von 3500 mg NO3/l d angestrebt, während als weitergehendes Ziel eine flexible Strategie zur Prozeßführung bei variierenden Konzentrationen der Abwasserinhaltsstoffe unter Einhaltung der durch den Rahmen-Abwasser-VwV Anhang 40 vorgeschriebenen Einleitungsgrenzwerte ermittelt werden sollte