A5068406390- Additive Manufacturing and 3D Printing Technologies
- Mechanical Behavior of Composites
- Microbial Fuel Cells and Bioremediation
- Advanced Welding Techniques Analysis
- Manufacturing Process and Optimization
- Injection Molding Process and Properties
- Additive Manufacturing Materials and Processes
- Metal Forming Simulation Techniques
- Analytical Chemistry and Sensors
- Microbial Community Ecology and Physiology
- Mechanical stress and fatigue analysis
- Electrochemical sensors and biosensors
- Adhesion, Friction, and Surface Interactions
- Mechanical Engineering and Vibrations Research
- Gear and Bearing Dynamics Analysis
- Material Selection and Properties
- Polymer Foaming and Composites
- Spacecraft and Cryogenic Technologies
- Electronic Packaging and Soldering Technologies
- Advanced machining processes and optimization
- Tribology and Wear Analysis
- Epoxy Resin Curing Processes
- Advanced Battery Technologies Research
- Fiber-reinforced polymer composites
- Synthesis and properties of polymers
Friedrich-Alexander-Universität Erlangen-Nürnberg
2017-2023
Bavarian Polymer Institute
2017-2022
Teledyne Technologies (United States)
2011-2017
Mechanical joining technologies are increasingly used in multi-material lightweight constructions and offer opportunities to create versatile processes due their low heat input, robustness metallurgical incompatibilities various process variants. They can be categorised into which require an auxiliary element, or do not element. A typical example for a mechanical with element is self-piercing riveting. wide range of exist requiring This allows both point-shaped (e.g., by clinching)...
Supported by the natural potential difference between anoxic sediment and oxic seawater, benthic microbial fuel cells (BMFCs) promise to be ideal power sources for certain low-power marine sensors communication devices. In this study a chambered BMFC with 0.25 m2 footprint was used an acoustic modem interfaced oceanographic sensor that measures dissolved oxygen temperature. The experiment conducted in Yaquina Bay, Oregon over 50 days. Several improvements were made design management system...
Multicellular, filamentous, sulfur-oxidizing bacteria, known as cable were discovered attached to fibers of a carbon brush electrode serving an anode benthic microbial fuel cell (BMFC). The BMFC had been operated in temperate estuarine environment for over year before collecting samples scanning electron microscopy and phylogenetic analyses. Individual filaments by single terminus cells with networks pilus-like nano-filaments radiating out from these cells, across the fiber surface, between...
Glass welding by ultrashort laser pulses allows joining without the need of an absorber or a preheating and postheating process. However, cracks generated during process substantially impair strength seams. In this paper sample preparation method is described that prevents formation cracks. The measured samples prepared higher than previously reported values.
Abstract Most oceanographic instruments on the seafloor have no connections with surface and therefore to run batteries store data until recovery. To demonstrate a developing technology, sensors acoustic modems were powered energy harvested from seafloor, relayed acoustically in near–real time Monterey Accelerated Research System (MARS) observatory Bay, California, research vessels. MARS is cabled deep water (~890 m) at edge of Canyon. An modem was attached node configured send out commands...
In this work, the influence of gate design and mould temperature on mechanical tribological characteristics a polyamide-steel gear set is investigated. Of special interest interaction processing parameters, in case temperature, resulting properties polymer wheel. At 60 °C has high wear behaviour. Wear increases by 75% for gears with single pin-point gates compared to sprue gates. With triple manufactured at 25% higher specimens. Increasing 100 reduces all designs level gate. This due...
In recent years, sale of recreational marijuana products has been permitted in several states and countries resulting rapid growth the commercial cannabis cultivation processing industry. As previous research shown, biogenic volatile organic compounds (BVOCs) emitted from plants can react with other urban air constituents (e.g., NOx, HO radical) thus negatively affect regional quality. this pilot study, BVOC emissions Cannabis were analyzed at four grow facilities. The concentrations...
Abstract A new method for in situ deformation and wear measurement of polymer gears has been developed at the LKT validated polyamide-66 (PA66) constant loading torque rotational speed. This contribution contains a more comprehensive validation newly test by examining polybutylenterephtalate (PBT) under varying conditions. The is based on measuring analysing timing differences between index pulse signals rotary encoders input output shaft rig. Since total tooth combination different effects,...
In the product manufacturing cycle, joining of polymers often takes a central position.Vibration welding is characterized by short cycle times, high process flexibility and stability as well achievement bond strengths without using additives.However, vibration clearly restricted necessary adhesion compatibility partners.By means structuring one partner subsequent filling structures second partner, form-fit enables combination incompatible polymers.Within these investigations, bonds between...
The production of components consisting various polymer types by welding is severely restricted and only possible for bonding compatible materials with melting points in a close range. Several modifications, such as the cross-linking one joining partner, allow circumventing restrictions regarding but do not help incompatible materials. Investigations dissimilar material combinations, especially from polymer-metal hybrid structures, show high potential connections based on form fits. Within...
Aluminum tris-(diethylphosphinate) (AlPi) is known to have an efficient flame-retardant effect when used in poly(butadiene terephthalates) (PBT). Additionally, better effects can be achieved through the partial substitution of AlPi by boehmite multi-component systems, which been shown effective synergist due cooling and residue formation. Although potential beneficial generally well known, influence particle sizes behavior synergistic compositions are still unknown. Within this paper, it...
Joining often assumes a central position in the manufacturing process. Vibration welding is characterized by its process flexibility, high energy-efficiency as well short cycle times. Polymer processes, however, are restricted due to necessary adhesion compatibility of joining partners. Therefore, industrial application strongly limited for multi-material joints. Generating form-fit connection means vibration enables an innovative approach incompatible polymers. For this purpose, pin-like...
The demand for media-tight assemblies has increased continuously in recent years. explanation this is the increasing automation, which not only reason more electronics and sensors, but also application increasingly exposed areas. Components must be efficiently protected from these new stresses, such as those caused by contact with aggressive corrosive media. Assembly injection moulding a process suitable large series production that can used to achieve protective effect overmoulding. focus...
Abstract Laser‐sintering offers the possibility to produce complex and individualized components cost‐effectively. To fully exploit advantages of laser‐sintering in assemblies with mass‐produced components, high‐performance joining processes like welding are necessary. Thus, a cost‐effective customization products can be enabled, which allows follow increasing trend individualization. Infrared welding, particular, also suitable for laser‐sintered parts due reduced transverse forces during...
Radiation crosslinking of polyamide 66 with electron beams alters the material characteristics. This leads to a varied relationship between process, structure, and properties for vibration welding crosslinked 66. A three‐dimensional network covalent bonds in amorphous areas results an impeded melt flow altered possible way influence this is change mold temperature during injection molding process. At higher temperatures, degree crystallinity increases decrease resulting area. The influences...
The wear behaviour of PBT-steel gear sets under temporarily changed load has been investigated using an in situ test rig developed at the LKT. method is based on analysing timing differences between index pulses rotary encoders input and output shaft rig. loading torque was varied two levels compared to permanently applied equivalent average terms resulting tooth flank wear. Moreover, number changes analyse influence results show that spectrum determines even if same. it could be shown...
Rotational molding allows the production of seamless, hollow parts with a high degree design flexibility. Nevertheless, process has limitations such as long cycle times holding are necessary to produce components free air inclusions. Within scope this article, an experimental setup was developed evaluate possibility and resulting effects using vacuum in rotational process. For purpose, trials different pressure levels were carried out porosity surface quality well mechanical properties...
Abstract Joining technologies have a crucial role in the product development process, e.g. to achieve local part properties or functional integrations. This often requires multi-material joints, which are challenging for conventional joining processes. Therefore, innovative processes needed generate bonds between adhesion-incompatible material combinations, such as using pin-like structures vibration welding process. Investigations into this novel process provided initial findings; however,...
An autonomous sensor platform powered by a benthic microbial fuel cell (BMFC) has been developed and deployed to supply hourly dissolved oxygen (O <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> ), temperature conductivity measurements from remote location in the core of minimum zone northeast Pacific. The uses compact acoustic modem both store transmit energy harvesting measurements. Initial results first 150 days operation are...
In recent years, foams have experienced a major economic uprise, not least due to their lightweight construction potential. this article, new process variation is presented, which enables the generation of foamed structures in rotational molding by utilization vacuum. The novel method based on entrapped air melt as an intrinsic physical blowing agent. By applying negative pressure cooling or solidification phase, bubbles expand. crystallization freezes existing conditions and thus forms...
In industrial applications, multi-material joints are becoming increasingly important to achieve a sustainable and resource-saving production. Not only high mechanical properties during the component use have be given, but also possibilities separate joint after end of life crucial. The recycling re-use materials plays an increasing role in process chain. Conventional can separated by cutting out joining zone, solvents, or thermal degradation. However, these methods result loss material,...
As a new and innovative processing method for fabrication fiber-reinforced thermoplastic composites (CFRTs), the feasibility of ultrasonic welding technology was proven in several studies. This offers potential direct manufacturing CFRT–metal structures via embedded pin structures. Despite previous studies, deeper understanding process energy input whether fibers work as directors consequently can, combination with chosen parameters, influence consolidation quality CFRTs, is still unknown....
Joining technologies have a decisive role in the product development cycle. Welding processes are widely used industrially, which, addition to number of advantages, also limitations on possible material combinations. Therefore, novel joining necessary, like using pin-like structures vibration welding technology. Beside known and process correlations, structure formation effect resulting bond properties. For this reason, structuring step was analyzed within study. The investigations allowed...