A5032585009- Metallurgy and Material Forming
- Metal Forming Simulation Techniques
- Laser and Thermal Forming Techniques
- Manufacturing Process and Optimization
- Microstructure and Mechanical Properties of Steels
- Advanced machining processes and optimization
- Innovations in Concrete and Construction Materials
- Flexible and Reconfigurable Manufacturing Systems
- Advanced Welding Techniques Analysis
- Metal Alloys Wear and Properties
- Groundwater flow and contamination studies
- Aluminum Alloy Microstructure Properties
- Digital Transformation in Industry
- Engineering and Materials Science Studies
- Magnetic Properties and Applications
- Architecture and Computational Design
- Action Observation and Synchronization
- Aluminum Alloys Composites Properties
- Motor Control and Adaptation
- Civil and Structural Engineering Research
- Additive Manufacturing and 3D Printing Technologies
- Rock Mechanics and Modeling
- Geophysical and Geoelectrical Methods
- Earthquake Detection and Analysis
- Microstructure and mechanical properties
RWTH Aachen University
2014-2025
Society of Thoracic Surgeons
2022
Equipes Traitement de l'Information et Systèmes
2014
Institut de Radioprotection et de Sûreté Nucléaire
2012-2014
École Nationale Supérieure de l'Électronique et de ses Applications
2010-2013
CY Cergy Paris Université
2010-2013
Institut de Mécanique des Fluides de Toulouse
2009-2012
This paper presents an experimental and modeling study to investigate predict the microstructure evolution for single-phase austenite ferrite steels with chemistry of corresponding phases in a duplex stainless steel SUS329J4L under hot forming conditions. For compositions both phases, single-pass uniaxial compression tests, stress relaxation heat treatment tests have been conducted temperature range 1000–1250 °C strain rates ranging from 0.3 30 s−1. The dynamic static recrystallization...
This paper presents an extended method for determining flow curves under shear loading using torsion tests, a technique often used to characterize plastic behavior in metal forming. Torsion tests are advantageous due their ability achieve up large strains (~3) while maintaining stable specimen geometry during deformation. However, the strain and rate distribution across non-uniform, increasing radially from rotation axis. Traditional analytical methods, such as Fields Backofen approach,...
Motor imagery is defined as a dynamic state during which the representation of given motor act internally rehearsed without overt output. Some evidence in experimental psychology has suggested that ability crucial for correct understanding social intention. The present study was conducted first to confirm nature intention leads early modulations movement kinematics. Secondly, we tested whether humans use read an agent’s when observing very element complex action sequence. Results revealed...
In order to not only produce an open-die forged part with the desired final geometry but also maintain economic production, precise process planning is necessary. However, due incremental forming of billet, often several hundred strokes, design arbitrarily complicated and, even today, based on experience or simple mathematical models describing development. Hence, in this paper, fast were merged a double deep Q-learning algorithm enable pass schedule including multi-objective optimization....
Incremental sheet forming (ISF) is a flexible metal process to realize products within short time from design the first produced part. Although fundamental research on ISF has been carried out around world, still misses commonly required tolerances for industrial application. In this study, influences of tool path as well intrusion depth into material geometrical accuracy were investigated. conducted experiments, both flat and stretch-formed blanks with different paths depths examined....
Abstract In the context of versatile and environmentally friendly joining techniques, by forming has proven to be a very useful tool. From this category, hemming is widely used for sheet metal parts like car body panels. Still, concave convex geometries represents challenge conventional as well more flexible roller hemming. Especially smaller radii greater flange lengths, these methods can reach their limits. present work, incremental (ISF), process without dedicated tools high formability,...
Reducing the weight of parts through lightweight designs impacts CO2 emissions, especially in automotive and transportation sectors, which have significant fuel electric energy consumption. Using multi-material design approaches, specific material properties can be combined to achieve effective lightweighting. Commonly used metals include aluminum, is known for its high strength, steel, valued strength structural integrity. However, joining aluminum steel presents challenges given their...
In the architecture and construction sector increasing wish for individualization is often expressed in complex-shaped freeform buildings. Due to missing universal mature methods, buildings are usually realized using customized solutions including material-consuming substructures, while visible skin has neither structural nor functional properties. this context a new concept presented manufacturing self-supporting lightweight structures that integrates load- bearing, properties façade design...
Abstract Blechumformung ist traditionell ein hochaufwendiger Prozess, der teurer Werkzeuge und Formen wie Gesenke oder Patrizen zugehöriger Stempel bedarf, die erst bei hohen produzierten Stückzahlen rentabel werden. Aus diesem Grund beschränkt sich im Bauwesen Einsatz umgeformter Stahlprodukte bisher auf Verwendung von Halbzeugen z. B. Walzprofilen. Die inkrementelle (IBU), neuartiges Umformverfahren, arbeitet ganz andere Weise. Statt eines einstufigen Pressvorgangs, dem das Blech in Form...
In the architecture and construction sector trend for individualization is often expressed in complex-shaped freeform buildings. Due to missing universal mature methods buildings, they are usually realized with customized solutions that include massive, material-consuming substructures, while visible skin has neither structural nor functional properties. this context a new concept self-supporting lightweight structures realization of free-form surfaces production corresponding components...
Product development is complex due to the manifold requirements resulting from various perspectives, such as design, production, safety and sales. A concurrent engineering (CE) approach permits respect all perspectives in early stage. However, architecture construction sector for example, CE particularly difficult realize, because central steering this collaboration process missing. Thus, application of research can promote technical progress cost reduction. In specific field freeform...
Herein, an alloy with 4.5 wt% Si is produced by twin‐roll casting and processed into a crack‐free electrical steel warm rolling final annealing. A comprehensive material characterization allows insight the solidification structure, segregation, microstructure, texture evolution during process chain, as well soft magnetic properties of steel. weak but favorable θ ‐fiber formed appears again in annealed state. Despite high content, this leads to relatively polarization values. Nevertheless,...
Abstract Der Einsatz von Stahl im Bauwesen war über viele Jahre engen Vorgaben hinsichtlich der einsetzbaren Halbzeuge geprägt und verlieh Stahlkonstruktionen häufig den Charakter „Baukastensystemen“. Die Modernisierung Bearbeitungsmethoden veränderte diese Gegebenheiten. Im digitalen Zeitalter ist es nunmehr möglich, nicht nur aufseiten Produktion, sondern auch des Entwurfs, Darstellung, Planung Konstruktion eine Prozesskette zu erstellen, mit deren Unterstützung hoch individualisierte...
In incremental sheet forming (ISF), the geometrical accuracy is still a challenge that only solved for specific applications. The underlying mechanisms of defects in ISF are very complex and not fully understood. Nevertheless, process understanding constantly evolving. Recent work has shown, example, how bending moments resulting from residual stresses affect geometric accuracy. It become clear with an axis parallel to main tool path direction dominant. Based on that, current paper...
Various industries, including mechanical engineering, utilize steel rings featuring variable cross-sectional profiles, such as eccentric rings. Presently employed methods for producing possess drawbacks like restricted geometries, significant material wastage or uneven microstructures. The radial–axial ring rolling process serves to create seamless rolled with near-net-shaped cross-sections. A novel technique involves achieving eccentricity by dynamically adjusting the mandrel’s position...
Abstract Lightweight design can reduce CO 2 emissions and improve energy efficiency, especially in the fuel-intensive transportation sector. Multi-material approaches combine specific properties of materials for effective lightweight design. A multi-material component made from two metals used widely industry could exceptionally aluminum with strength structural integrity steel. However, joining steel is a challenge due to their different thermo-physical possible formation brittle...
Abstract Press-hardened ultra-high strength steel parts are widely used in the automotive sector for their lightweight and safety advantages. Medium-Manganese Steels (MMnS) being explored as an alternative to boron-manganese steels due high ductility after quenching, achieved at lower annealing temperatures thus reducing energy usage carbon emissions. However, industrial adoption of MMnS is hindered by challenging processing requirements, e.g. cold-rolling press hardening. To expedite...
Abstract Given the continuous increases in wind turbine (WT) rated power and size, nacelle weight logistic handling costs significantly. To support heavier nacelles, stronger towers are needed which again material costs, so a need for density increase arises. One solution to this problem is of cast or forged WT main shaft. The shafts limited by low tensile strength iron. High steels, theoretically density, used state-of-the-art shafts. However, their inner shaft diameter kept small reduce...