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Dive into the research topics where Martin Grünbaum is active.

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Featured researches published by Martin Grünbaum.


Production Engineering | 2013

Assessment of forming limit stress curves as failure criterion for non-proportional forming processes

Alexandra Werber; Mathias Liewald; Winfried Nester; Martin Grünbaum; Klaus Wiegand; Jörg Simon; Jürgen Timm; Walter Hotz

The forming limit stress curve (FLSC) is often recommended as failure criterion for the virtual tryout of forming processes which include non-proportional loading. However, parameters influencing position and shape of the forming limit stress curve are not fully known. Up to today it has not been proved if the forming limit curve is strain path-independent, or at least approximately path-independent. In this study the influence of the parameters yield criterion, flow curve extrapolation and level of pre-stretching on the applicability of the FLSC as failure criterion are assessed. The work is performed using the aluminum alloy AA6014 based on forming limit curves for proportional and non-proportional loading published in Werber et al. Key Eng Mater 502–506:71–76, (2012). FLSCs are generated for yield criteria according to von Mises and Hill’48, for flow curve extrapolations according to Ghosh and Hockett-Sherby as well as for an experimentally measured flow curve. In order to be able to assess the influence of the described parameters on the failure criterion based on the FLSC the application of a mean forming limit stress curve (MFLSC) is used. This method is based on the assumption that all FLSCs gained for proportional as well as non-proportional loading map to one single curve. The influence of yield criterion and flow curve approximation on the FLSCs is addressed; the strain path dependency of FLSCs is proved and the forming limit curves for non-linear loading calculated with an assumed mean forming limit stress curve are compared to the experimentally gained forming limit curves.


INTERNATIONAL CONFERENCE ON ADVANCES IN MATERIALS AND PROCESSING TECHNOLOGIES (AMPT2010) | 2011

Enhancement Of Forming Limits Of Aluminum Alloys Using An Intermediate Heat Treatment

Kathleen Siefert; Marion Merklein; Winfried Nester; Martin Grünbaum

Since the lightweight material aluminum exhibits reduced formability compared to conventional steel grades, additional steps for extending the existing forming limits have to be conducted. This paper presents an innovative approach for heat treatment embedded between two cold forming steps. The application of such intermediate heat treatment may reduce the strain hardening of the material which was induced during a first cold forming step. The alloy discussed in detail is AlMg4, 5Mn (AA5182). The heat treatment, e.g. in a furnace, should take place at a predefined temperature for a certain duration. This allows a higher degree of deformation in the second forming operation. The advantages of this methodology can be shown by conducting tensile tests. Tensile specimens are first pre‐strained to a defined strain value and then heat treated in a way that the recrystallization of the aluminum alloy is avoided. After cooling down the samples to room temperature, further tests are conducted up to failure of the ...


International Journal of Material Forming | 2014

Development of a new failure prediction criterion in sheet metal forming

Alexandra Werber; Mathias Liewald; Winfried Nester; Martin Grünbaum; Klaus Wiegand; Jörg Simon; Jürgen Timm; Walter Hotz


Archive | 2004

Curved bodywork component and method for producing said component

Robert Behr; Martin Grünbaum; Dieter Lange; Rainer Röck


Archive | 2006

Windschutz für Cabriolets

Martin Grünbaum; Dieter Lange


Archive | 2006

Kraftfahrzeug-Bauteil mit einem wölbstrukturierten Lochblech

Martin Grünbaum; Dieter Lange


Archive | 2005

Wind protection system for cabriolets

Martin Grünbaum; Dieter Lange


Archive | 2004

Windschutz für Cabriolets Wind protection for convertibles

Martin Grünbaum; Dieter Lange


Archive | 2003

Procede et outil de matricage destines a la fabrication d'un composant a partir d'une tole de structure courbe

Günter Braun; Jürgen Ehrenpfort; Martin Grünbaum; Bernd Heim; Dieter Lange; Michael Schwabe; Daniela Seitz


Archive | 2003

Wölbstrukturiertes Karosseriebauteil und Verfahren zu seiner Herstellung Wölbstrukturiertes body component and process for its preparation

Robert Behr; Martin Grünbaum; Dieter Lange; Rainer Röck

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Marion Merklein

University of Erlangen-Nuremberg

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