Author
Bernd-Arno Behrens
Other affiliations: Technische Universität München, Rolf C. Hagen Group
Bio: Bernd-Arno Behrens is an academic researcher from Leibniz University of Hanover. The author has contributed to research in topics: Forging & Forming processes. The author has an hindex of 23, co-authored 502 publications receiving 3175 citations. Previous affiliations of Bernd-Arno Behrens include Technische Universität München & Rolf C. Hagen Group.
Papers published on a yearly basis
Papers
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TL;DR: In this article, the authors define a new class of sheet-bulk metal forming processes, give an overview of the existing processes belonging to this class, highlight the tooling aspects as well as the resulting product properties and present a short summary of the relevant work that has been done towards modeling and simulation.
314 citations
TL;DR: The hot stamping processes of quenchable steel sheets potentially offer not only small forming load and high formability, but also high strength and no springback by die quenching.
234 citations
TL;DR: In this paper, the adopted methods and development process of a precision forging process exemplarily considering a helical gearwheel and a crankshaft are described, and the design process for complex precision forged parts has to be purpose-built to consider the distinctions of this technique.
69 citations
TL;DR: Numerical investigations prove that a static load situation is insufficient for representing the whole gait cycle, which causes severe deviations in the FE calculation of the bone remodelling.
Abstract: There are several numerical investigations on bone remodelling after total hip arthroplasty (THA) on the basis of the finite element analysis (FEA). For such computations certain boundary conditions have to be defined. The authors chose a maximum of three static load situations, usually taken from the gait cycle because this is the most frequent dynamic activity of a patient after THA. The numerical study presented here investigates whether it is useful to consider only one static load situation of the gait cycle in the FE calculation of the bone remodelling. For this purpose, 5 different loading cases were examined in order to determine their influence on the change in the physiological load distribution within the femur and on the resulting strain-adaptive bone remodelling. First, four different static loading cases at 25%, 45%, 65% and 85% of the gait cycle, respectively, and then the whole gait cycle in a loading regime were examined in order to regard all the different loadings of the cycle in the simulation. The computed evolution of the apparent bone density (ABD) and the calculated mass losses in the periprosthetic femur show that the simulation results are highly dependent on the chosen boundary conditions. These numerical investigations prove that a static load situation is insufficient for representing the whole gait cycle. This causes severe deviations in the FE calculation of the bone remodelling. However, accompanying clinical examinations are necessary to calibrate the bone adaptation law and thus to validate the FE calculations.
68 citations
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31 Oct 2001
TL;DR: The American Society for Testing and Materials (ASTM) as mentioned in this paper is an independent organization devoted to the development of standards for testing and materials, and is a member of IEEE 802.11.
Abstract: The American Society for Testing and Materials (ASTM) is an independent organization devoted to the development of standards.
3,792 citations
TL;DR: In this article, the state of the art in the thermal, mechanical, microstructural, and technological fields of hot stamping is reviewed, and the investigations of all process sequences, from heating of the blank to hot stamps and subsequent further further processes are described.
1,397 citations
TL;DR: In this article, the authors provide an overview of the state of the art in such joining processes, including cold welding, friction stir welding, self-pierce riveting, mechanical clinching and joining by forming.
365 citations
15 Jul 2008-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the grain size dependence of the tensile properties and the deformation mechanisms responsible for those properties are examined for Mg alloy, AZ31B, sheet, and the amount of twinning is found to increase with increasing grain size.
Abstract: The grain size dependence of the tensile properties and the deformation mechanisms responsible for those properties are examined for Mg alloy, AZ31B, sheet. Specifically, the Hall–Petch effect and strain anisotropy ( r -value) are characterized experimentally, and interpreted using polycrystal plasticity modeling. {1 0 . 2} extension twins, {1 0 . 1} contraction twins, and so-called “double-twins” are observed via microscopy and diffraction-based techniques, and the amount of twinning is found to increase with increasing grain size. For the sheet texture and tensile loading condition examined, {1 0 . 2} extension twinning is not expected, yet the polycrystal plasticity model predicts the observed behavior, including this ‘anomalous’ tensile twinning. The analysis shows that the Hall–Petch strength dependence, of the polycrystal as a whole, is primarily determined by the grain size dependence of the strength of the prismatic slip systems.
344 citations
TL;DR: Hybrid manufacturing processes are based on the simultaneous and controlled interaction of process mechanisms and/or energy sources/tools having a significant effect on the process performance as discussed by the authors, which can have a large influence on the processing/manufacturing characteristics resulting in higher machinability, reductions of process forces and tool wear.
320 citations