Suchergebnisse

Die Blechmassivumformung erlaubt die effiziente Herstellung von leichtbaugerechten Funktionsbauteilen mit verschiedenartigen Nebenformelementen in einem kombinierten einstufigen Tiefzieh- und Stauchprozess. Durch die Analyse der Umformergebnisse mit konventionellem Halbzeug anhand von Gefügeschliffbildern und Härtemessungen lassen sich Bauteilfehler in Form von Falten und Rillen identifizieren. Diese lassen sich größtenteils auf einen dreiachsigen Spannungs- und Dehnungszustand sowie eine inadäquate Formfüllung zurückführen. Eine signifikante Verbesserung der Bauteilqualität kann durch den Einsatz von maßgeschneiderten Halbzeugen in der untersuchten Prozesskette ermöglicht werden. Durch die Herstellung der Halbzeuge in einem Taumelprozess kann eine gezielte Materialvorverteilung erfolgen, welche die Formfüllung deutlich erhöhen und in Folge dessen die auftretenden Bauteilfehler reduzieren kann. Aktuelle Forschungsarbeiten am Lehrstuhl für Fertigungstechnologie beschäftigen sich demnach mit der Erweiterung des Einsatzbereichs von maßgeschneiderten Halbzeugen.
 
Sheet Bulk Metal Forming enables the efficient manufacturing of functional lightweight components with different functional elements in a combined single stage deep drawing and upsetting process. By investigating the forming results with a conventional blank, regarding the properties like grain structure and Vickers hardness distribution, process limitations such as buckling and folding can be detected. These failures occur due to a three-dimensional stress and strain state as well as an insufficient die filling. A significant improvement of the quality of the produced parts can be enabled by the use of Tailored Blanks in the investigated process chain. With the manufacturing of the semi-finished parts by orbital forming, an adapted material pre-distribution can be realized, thus improving the die filling followed by a decrease of the parts' failures. Current research at the Institute of Manufacturing Technology focuses on the extension of the applicability of Tailored Blanks.

This is the final version. Available on open access from Wiley via the DOI in this record ; Data availability: Data, code, and materials are available at the following link: https://osf.io/5uxc7/ ; The relationships between subjective status and perceived legitimacy are important for understanding the extent to which people with low status are complicit in their oppression. We use novel data from 66 samples and 30 countries (N = 12,788) and find that people with higher status see the social system as more legitimate than those with lower status, but there is variation across people and countries. The association between subjective status and perceived legitimacy was never negative at any levels of eight moderator variables, although the positive association was sometimes reduced. Although not always consistent with hypotheses, group identification, self‐esteem, and beliefs in social mobility were all associated with perceived legitimacy among people who have low subjective status. These findings enrich our understanding of the relationship between social status and legitimacy. ; Center for Intercultural and Indigenous Research ; European Union Horizon 2020 ; Center for Social Conflict and Cohesion Studies ; Fondo Nacional de Desarrollo Científico y Tecnológico ; Spanish Ministry of Economy and Competitiveness ; Czech Science Foundation ; Institute of Psychology, Czech Academy of Sciences