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Browsing by Author "0e63c733-f437-4886-872f-229dd1f18644"

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Advanced Wear Simulation for Bulk Metal Forming Processes

Behrens, Bernd-Arno; Bouguecha, Anas; Vucetic, Milan; Chugreev, Alexander (Les Ulis : E D P Sciences, 2016)

In the recent decades the finite element method has become an essential tool for the cost-efficient virtual process design in the metal forming sector in order to counter the constantly increasing quality standards, ...
Comparative measurements of bone mineral density and bone contrast values in canine femora using dual-energy X-ray absorptiometry and conventional digital radiography

Lucas, K.; Nolte, Ingo; Galindo-Zamora, V.; Lerch, M.; Stukenborg-Colsman, C.; Behrens, Bernd-Arno; Bouguecha, Anas; Betancur, S.; Almohallami, Amer; Wefstaedt, Patrick (London : BioMed Central Ltd., 2017)

Background: Aseptic loosening due to bone remodelling processes after total hip replacement is one common cause for revision surgery. In human medicine, dual-energy X-ray absorptiometry (DEXA) is the gold standard for ...
Comparison between simulation results and DEXA investigation of the bone remodelling after implanting a cementless long stem hip prosthesis

Almohallami, Amer; Bouguecha, Anas; Stukenborg-Colsman, Christina; Lerch, M.; Nolte, I.; Behrens, Bernd-Arno (Berlin : Walter de Gruyter, 2013-09-07)

Bone remodelling around a femoral prosthesis is one of the main reasons of aseptic loosening of the implant’s stem. The difference in stiffness between the bone tissue and the prosthesis leads to unload the periprosthetic ...
Correction: Mechanical properties of femoral trabecular bone in dogs

Pressel, Thomas; Bouguecha, Anas; Vogt, Ute; Meyer-Lindenberg, Andrea; Behrens, Bernd-Arno; Nolte, Ingo; Windhagen, Henning (London : BioMed Central Ltd., 2005)

After the publication of this work [1], we became aware of the fact that the frequency of the ultrasound transmitter that we used for determining the elastic moduli of the trabecular bone specimens was not correctly ...
Creating load-adapted mechanical joints between tubes and sheets by controlling the material flow under plastically unstable tube upsetting

Sviridov, A.; Rusch, M.; Almohallami, A.; Bonk, Christian; Bouguecha, Anas; Bambach, M.; Behrens, Bernd-Arno (Amsterdam : Elsevier, 2017)

Mechanical joining processes provide various advantages over conventional fusion welding of metallic components such as shorter cycle times, little or no heat input and reduced need for subsequent surface finishing operations. ...
Energy-efficient Drive Concepts in Metal-forming Production

Behrens, Bernd-Arno; Bouguecha, Anas; Krimm, Richard; Teichrib, Sergej; Nitschke, Thomas (Amsterdam : Elsevier, 2016)

Nowadays, efficient drive solutions for the production industry are more important than ever. In view of this, new energy-efficient drive concepts for forming presses and sheet metal feeding systems are developed at the ...
Experimental Characterization and Material Modelling of an AZ31 Magnesium Sheet Alloy at Elevated Temperatures under Consideration of the Tension-Compression Asymmetry

Behrens, Bernd-Arno; Bouguecha, Anas; Bonk, Christian; Dykiert, M. (Bristol : Institute of Physics Publishing, 2017)

Magnesium sheet alloys have a great potential as a construction material in the aerospace and automotive industry. However, the current state of research regarding temperature dependent material parameters for the description ...
Experimental-numerical evaluation of a new butterfly specimen for fracture characterisation of AHSS in a wide range of stress states

Peshekhodov, Ilya; Jiang, S.; Vucetic, Milan; Bouguecha, Anas; Behrens, Bernd-Arno (Bristol : Institute of Physics Publishing, 2016)

Results of an experimental-numerical evaluation of a new butterfly specimen for fracture characterisation of AHHS sheets in a wide range of stress states are presented. The test on the new butterfly specimen is performed ...
FEA-based optimisation of a clinching process with an open multiple-part die aimed at damage minimisation in CR240BH-AlSi10MnMg joints

Behrens, Bernd-Arno; Bouguecha, Anas; Vucetic, Milan; Hübner, Sven; Yilkiran, Deniz; Jin, Yilin; Peshekhodov, Ilya (Les Ulis : EDP Sciences, 2015)

The paper presents results of a FEA-based tool design optimisation for a clinching process with an open multiple-part die. The studied materials are the bake-hardening steel CR240BH (1.5 mm) on the punch side and the ...
Finite element analysis regarding the forming behaviour of symmetric hybrid structures consisting of two sheet metal outer layers and a thermoplastic core

Behrens, Bernd-Arno; Bouguecha, Anas; Bonk, Christian; Schulze, H. (Bristol : Institute of Physics Publishing, 2017)

To face challenges like damping effects or weight reduction in the automotive sector, new hybrid material combinations are developed. One possibility is the combination of several symmetric material layers with varying ...
Hot stamping of load adjusted structural parts

Behrens, Bernd-Arno; Bouguecha, Anas; Gaebel, Christoph Michael; Moritz, Jörn; Schrödter, Jens (Amsterdam : Elsevier, 2014)

The importance of high-strength steel concepts for car bodies has increased in recent years due to the necessity of weight reduction and improved crash safety. By using hot stamping or also known as press hardening of boron ...
Implementation of the Bai and Wierzbicki fracture criterion in QForm and its application for cold metal forming and deep drawing technology

Gladkov, Yury; Peshekhodov, Ilya; Vucetic, Milan; Bouguecha, Anas; Behrens, Bernd-Arno (Les Ulis : EDP Sciences, 2015)

The paper presents implementation of fracture prediction algorithm for a cold metal forming process simulation in the software QForm. Authors programmed the function for calculation of the criterion proposed by Bai and ...
Mechanical properties of co-extruded aluminium-steel compounds

Thürer, Susanne Elisabeth; Uhe, Johanna; Golovko, Oleksandr; Bonk, Christian; Bouguecha, Anas; Behrens, Bernd-Arno; Klose, Christian (Pfaffikon : Scientific.Net, 2017)

Within the scope of the Collaborative Research Centre (CRC) 1153 novel process chains for the production of hybrid solid components by Tailored Forming are developed at the Leibniz Universität Hannover. The combination of ...
Mechanical properties of femoral trabecular bone in dogs

Pressel, Thomas; Bouguecha, Anas; Vogt, Ute; Meyer-Lindenberg, Andrea; Behrens, Bernd-Arno; Nolte, Ingo; Windhagen, Henning (London : BioMed Central Ltd., 2005)

Background: Studying mechanical properties of canine trabecular bone is important for a better understanding of fracture mechanics or bone disorders and is also needed for numerical simulation of canine femora. No detailed ...
Numerical and experimental determination of cut-edge after blanking of thin steel sheet of DP1000 within use of stress based damage model

Behrens, Bernd-Arno; Bouguecha, Anas; Vucetic, Milan; Krimm, Richard; Hasselbusch, Tobias; Bonk, Christian (Amsterdam : Elsevier, 2014)

The proposed study focuses on blanking of thin steel sheets of Dogal1000DP +Z100MBO. Numerical and experimental investigations of the influence of clearance and punch speed on the cutting force and the geometry of the ...
Numerical and experimental investigations of the anisotropic transformation strains during martensitic transformation in a low alloy Cr-Mo steel 42CrMo4

Behrens, Bernd-Arno; Bouguecha, Anas; Bonk, Christian; Chugreev, Alexander (Amsterdam : Elsevier, 2017)

Hot forming as a coupled thermo-mechanical process comprises of numerous material phenomena with a corresponding impact on the material behavior during and after the forming process. Within the subsequent heat treatment, ...
Numerical and experimental investigations on an extrusion process for a newly developed ultra-high-carbon lightweight steel for the automotive industry

Behrens, Bernd-Arno; Bouguecha, Anas; Bonk, Christian; Yarcu, D.; Kazhai, M. (Bristol : Institute of Physics Publishing, 2017)

In this study the material flow of a newly developed ultra-high-carbon lightweight steel (uhc-steel) with a high amount of aluminum was investigated in an extrusion process. Cylinder compression tests were performed for ...
Numerical Investigation for the Design of a Hot Forging Die with Integrated Cooling Channels

Behrens, Bernd-Arno; Bouguecha, Anas; Vucetic, M.; Bonhage, M.; Malik, I.Y. (Amsterdam : Elsevier, 2016)

Ongoing research at the Institute of Forming Technology and Machines (IFUM) within the scope of sub-project E3 of the Collaborative Research Centre 653 deals with the generation of controlled cavities inside a sintered hot ...
Numerical Investigation of the Oxide Scale Deformation Behaviour with Consideration of Carbon Content during Hot Forging

Behrens, Bernd-Arno; Kawalla, R.; Awiszus, B.; Bouguecha, Anas; Ullmann, M.; Graf, M.; Bonk, Christian; Chugreev, A.; Wester, H. (Amsterdam : Elsevier, 2017)

Due to increasing product requirements the numerical simulation has become a powerful tool for the effective and efficient design of individual process steps as well as entire process chains. In order to model hot forging ...
Numerical investigations of stress shielding in total hip prostheses

Behrens, Bernd-Arno; Wirth, C.J.; Windhagen, H.; Nolte, I.; Meyer-Lindenberg, Andrea; Bouguecha, Anas (London : SAGE Publications Ltd., 2008)

Aseptic loosening of the prosthesis is still a problem in artificial joint implants. The loosening can be caused by, among other factors, resorption of the bone surrounding the prosthesis owing to stress shielding. In order ...

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