Robert Schneider

Robert Schneider
Technische Hochschule Ulm · Mechatronics and Medical Engineering

PhD

About

29
Publications
11,423
Reads
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168
Citations
Citations since 2017
18 Research Items
150 Citations
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20172018201920202021202220230102030
20172018201920202021202220230102030

Publications

Publications (29)
Article
Full-text available
Climate change and normative requirements are forcing car manufacturers to make their products ever lighter despite the highest safety requirements. For this case study a high-strength EN AW-7075 alloy is used as an example of how hot formed aluminium components for vehicle bodies can be produced on existing steel hot forming lines. Reusing product...
Chapter
Full-text available
The usage of ultra-high strength aluminium alloys (EN AW-7000 series) offers a great weight saving potential due to the high rigidity and specific strength values. Various heat assisted forming technologies have been developed in order to improve the limited formability at room temperature and thus to be able to increase the geometrical complexity...
Technical Report
Full-text available
In the present work the influence of industry- standard heat treatment on ultra-high strength aluminium alloys has been investigated under terms of various forming processes. For this purpose, a scaled side impact beam was formed out of AA7075 via Hotforming and W-Temper techniques and subjected to a heat treatment process. The test material was ta...
Article
Sheet metal aluminum alloys in the 5000 and 6000 series show increased formability if deformed at sub-zero temperatures which is beneficial for processing industries using sheet metals where evermore highly complex-shaped components are produced. In order to evaluate a cryogenic forming process, the temperature-dependent forming limits of the selec...
Conference Paper
Full-text available
The automotive industry is facing new challenges due to stricter CO2 emission laws. Thus, to design more environmentally-friendly cars, various lightweight construction strategies need to be considered to meet the growing demand for resource efficiency [1]. In order to minimise weight, the lightweight design strategy "form construction" is increasi...
Conference Paper
Full-text available
The automotive industry is facing new challenges due to stricter CO2 emission laws. Thus, to design more environmentally-friendly cars, various lightweight construction strategies need to be considered to meet the growing demand for resource efficiency [1]. In order to minimise weight, the lightweight design strategy "form construction" is increasi...
Presentation
Full-text available
Introduction -Aalen University -Lightweight Technology Centre (TZL) -General information about aluminium Extended Hotforming Process for high strength aluminium alloys -Determination of material parameters for the Extended Hotforming Process -Material modelling of AA7075 in the Extended Hotforming Process using MAT_BARLAT_YLD2000 -Numerical calibra...
Presentation
Full-text available
Experimental tests with various specimen geometries were carried out to determine the force-displacement characteristics of AA7075 material in the Hotforming process Material modelling of AA7075 in the Hotforming process using MAT_BARLAT_YLD2000 The local strains at fracture have been monitored under different stress conditions (0<𝜂<2/3) using an...
Conference Paper
Full-text available
Aufgrund verschärfter CO2-Emissionsgesetze stehen die Automobilhersteller vor neuen Herausforderungen. Um umweltfreundlichere Autos zu bauen, müssen die Hersteller sich zunehmend verschiedene Leichtbaustrategien zunutze machen, um die steigende Nachfrage nach Ressourceneffizienz gerecht zu werden. Leichtbauwerkstoffe, die schon lange in der Luftfah...
Conference Paper
Full-text available
In the present work an effective parameter identification for the evaluation of a failure model for FE-simulations has been carried out. This failure model is suitable to calculate different fracture elongation values among occurring triaxiality of a high-strength aluminium sheet metal alloy (AA7075). Various specimen geometries have been selected...
Article
Full-text available
Forming complex parts out of high and ultra-high strength aluminium alloys has proved to be more challenging in comparison to the currently used deep drawing steels. The novel "Warmforming-Process" offers the potential to produce light and highly integrated one-piece components out of such aluminium alloys at elevated temperatures. When considering...
Conference Paper
Full-text available
Forming complex parts out of high and ultra-high strength aluminium alloys has proved to be more challenging in comparison to the currently used deep drawing steels. The novel "Warmforming-Process" offers the potential to produce light and highly integrated one-piece components out of such aluminium alloys at elevated temperatures. When considering...
Article
The objective of this work is to study the cryogenic sheet metal forming behaviour of precipitation hardening AW-6016-T4. In this regard, the flow curves and forming limit curves were obtained by tension and Nakazima experimental testing methods in the temperature ranges from −196 to 25 °C. It was found that strength and elongation increase with de...
Poster
Full-text available
For deep drawing operations of aluminium wrought alloys which show a limited formability at ambient temperatures the cryogenic forming process offers a great potential. This poster indicates the deep drawing behaviour of the commercial aluminium alloys EN AW-5182 and EN AW-6016 at very low temperatures. A device which allows deep drawing operations...
Article
Forming at cryogenic temperatures provides a significant improvement in formability of aluminum sheets. This offers the potential for light, complex and highly integrated one-piece components to be produced out of aluminum alloys at sub-zero temperatures. This would allow weight reduction, environmental conservation and cost reduction of a car body...
Article
Cryogenic forming, as a novel process route for enhancing the formability of aluminium alloys, requires new methods for modelling the flow behaviour. To date, the hardening behaviour of commercially used aluminium alloys is not known at sub-zero temperatures if higher strains are considered. Based on uniaxial tensile tests of ENAW-5182-H111 and ENA...
Conference Paper
Full-text available
This study describes the forming behaviour of work hardening AA5182 sheet alloy at various low temperatures. The material parameters including flow curves, Lankford parameters and forming limit curves were obtained by experimental testing in the temperature range from room temperature to-196 °C, which were then used for isothermal forming simulatio...
Conference Paper
Full-text available
Low-temperature forming technology offers a new potential for forming operations of aluminium wrought alloys which show a limited formability at ambient temperatures. This paper indicates the mechanical behaviour of the commercial aluminium alloys EN AW-5182 and EN AW-6016 at low temperatures. Stress-strain relationships at different temperatures w...
Article
Aluminium sheet metal alloys in the 5000 series exhibit a bad surface quality if deformed at ambient temperatures. The change in surface deviation can be attributed to the Portevin-LeChatelier (PLC) effect, which is not desirable in terms of visual perception. This investigation shows the surface topography of an AA5182 aluminium wrought alloy afte...
Article
Full-text available
Im Hinblick auf die Umformeigenschaften ist das Prozessfenster bei Aluminiumblechlegierungen im Vergleich zu Tiefziehstählen immer noch eingeschränkt. Seit geraumer Zeit finden auch Aluminiumlegierungen der höchstfesten 7000er Serie im Karosseriebau Einsatz. Dem zunehmenden Trend immer komplexere Geometrien an einem Automobil darzustellen ist bei d...
Chapter
Considering a tensile testing specimen, consisting of an isotropic ductile material, it can be observed that straining in the direction of the principal normal stress is accompanied by a cross-sectional reduction in width and thickness. In the region of uniform elongation the prismatic geometry of the specimen remains, since a random localisation s...
Article
Full-text available
Im Hinblick auf die Umformeigenschaften ist das Prozessfenster bei Aluminiumblechlegierungen immer noch stark eingeschränkt. Im Automobilbau werden primär Legierungen der 5000er und 6000er Serie eingesetzt. Der zunehmende Trend immer komplexere Geometrien an einem Automobil darzustellen ist bei diesen Legierungsgruppen, ohne neue Technologien, nur...
Article
Full-text available
The mechanical behaviour of the commercial aluminium alloys EN AW-5182, EN AW-6016 and EN AW-7021 is investigated at temperatures ranging from 298 to 77 K and strain rates from 1.7 × 10−3 to 6.6 × 10−2 s−1. A device that allows testing at cryogenic temperatures is developed and demonstrated, where the specimens are subject to uniaxial tensile loads...
Article
Full-text available
The mechanical behaviour of the commercial aluminium alloys EN AW-5182 and EN AW-6016 is investigated at temperatures ranging from 298 to 77 K and strain rates from 0.0017 to 0.066 1/s. A device which allows testing at cryogenic temperatures is developed and demonstrated, where the specimens are subject to uniaxial tensile loads. The influence of a...

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Projects

Projects (2)
Project
Increasing the formability of high and ultra-high strength aluminium wrought alloys for sheet metal applications
Project
Um die eingeschränkte Umformbarkeit von Aluminiumblechlegierungen zu erweitern, werden in diesem Projekt neue Legierungssysteme mit optimierten Eigenschaften hinsichtlich kryogener Umformbarkeit entwickelt.