Milan Vucetic

UConn Health

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Bernd‐Arno Behrens

Leibniz University Hannover

Anas Bouguecha

University of Sfax

Sven Hübner

Leibniz University Hannover

Ilya Peshekhodov

Faurecia (Germany)

N. Grbic

Leibniz University Hannover

Christian Bonk

Robert Bosch (Germany)

Amer Almohallami

Leibniz University Hannover

Matthias Lerch

Medizinische Hochschule Hannover

Ingo Nölte

University of Veterinary Medicine Hannover, Foundation

S. Betancur Escobar

Leibniz University Hannover

Cooperative Institutions

Leibniz University Hannover

Institut für Umformtechnik (Germany)

TU Dortmund University

Friedrich-Alexander-Universität Erlangen-Nürnberg

Fraunhofer Institute for Machine Tools and Forming Technology

UConn Health

Materials Science & Engineering

Medizinische Hochschule Hannover

Volkswagen Group (Germany)

Leibniz University of Applied Sciences

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Advanced finite element analysis of die wear in sheet-bulk metal forming processes

AIP conference proceedings (2016)

Bernd‐Arno Behrens Anas Bouguecha Milan Vucetic Alexander Chugreev Daniel Rosenbusch

Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Bernd-Arno Behrens, Anas Bouguecha, Milan Vucetic, Alexander Chugreev, Daniel Rosenbusch; Advanced finite element analysis of die wear in sheet-bulk metal forming processes. AIP Conf. Proc. 19 October 2016; 1769 (1): 130010. https://doi.org/10.1063/1.4963529 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAIP Publishing PortfolioAIP Conference Proceedings Search Advanced Search |Citation Search

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10.1063/1.4963529

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Citations (7)

Influence of Superimposing of Oscillation on Sheet-Bulk Metal Forming

Key engineering materials (2013)

Bernd‐Arno Behrens Sven Hübner Milan Vucetic

Due to novel processes like sheet-bulk metal forming, the requirements for sheet metal forming are increased. Sheet-bulk metal forming is a new interconnected process in which the part itself is manufactured by deep drawing and the gearing will be produced with bulk forming in a combined process at room temperature. This process is characterized by a triaxial state of stress and a triaxial dimensional change with true strains up to  = 1-2 by using sheet blanks. Within the use of superimposing of oscillation on a sheet-bulk metal forming process the required forming force can be reduced and the accuracy of dimension of the part can be improved. Within this paper the influence of the superimposing of oscillation on the sheet bulk metal forming will be shown on combined ironing and external extrusion process. For the superimposing of oscillation different excitation frequencies will be analysed. Furthermore the die clearance will be varied to increase the requirements on the process. Finally the influence of the different excitation frequencies and the different die clearances will be summarized in cause and effect relationship diagram.

Oscillation (cell signaling)

10.4028/www.scientific.net/kem.554-557.1484

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Citations (19)

Evaluation of three pulpotomy medicaments in primary teeth.

PubMed (2005)

Dejan Marković V Zivojinovic Milan Vucetic

To examine the success of the one-appointment pulpotomy technique with three different medicaments on primary molar teeth.The study was conducted on 104 primary molars in 104 children with an indication for pulpotomy treatment on at least one primary molar. Primary teeth were treated with either formocresol (FC) (34 teeth), calcium hydroxide (CA) (33 teeth) or ferric sulphate (FS) (37 teeth) using standardised criteria for the pulpotomy procedures. Teeth were clinically and radiographically evaluated during the examination period of 18 months.The clinical success rate at 18 months for the FC and FS groups was 90.9% and 89.2%, respectively. The CA showed an overall clinical success rate of 82.3%, with no statistical difference compared with either the FC or FS groups. The overall radiographic success for each technique was: FC 84.8%, CA 76.5%, and FS 81.1%. The presence of a dentine bridge above the pulp amputation site was observed radiographically for CA (47%), and FS (40.5%) pulpotomies without any statistical difference. Radiographic examination did not reveal the presence of a dentine bridge for any of the teeth treated with FC pulpotomy.Favourable clinical and radiographic success rates of ferric sulphate pulpotomy, comparable to formocresol were obtained. Therefore, ferric sulphate can be recommended as a pulpotomy medicament.

Pulpotomy

Pulpectomy

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FEA of the clinching process of short fiber reinforced thermoplastic with an aluminum sheet using LS-DYNA

AIP conference proceedings (2016)

Bernd‐Arno Behrens Anas Bouguecha Milan Vucetic N. Grbic

A structural concept in multi-material design is used in the automotive industry with the aim of achieving significant weight reductions of conventional car bodies. In this respect, the use of aluminum and short fiber reinforced plastics represents an interesting material combination. A wide acceptance of such a material combination requires a suitable joining technique. Among different joining techniques, clinching represents one of the most appealing alternative for automotive applications. This contribution deals with the FE simulation of the clinching process of two representative materials PA6GF30 and EN AW 5754 using the FE software LS-DYNA. With regard to the material modelling of the aluminum sheet, an isotropic material model based on the von Mises plasticity implemented in LS-DYNA was chosen. Analogous to aluminum, the same material model is used for modelling the short fiber reinforced thermoplastic. Additionally, a semi-analytical model for polymers (SAMP-1) also available in LS-DYNA was taken. Finally, the FEA of clinching process is carried out and the comparison of the simulation results is presented above.

LS-DYNA

10.1063/1.4963506

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Citations (10)

Sheet-Bulk Metal Forming of Symmetric and Asymmetric Parts

Advanced materials research (2013)

Valerian Salfeld Richard Krimm Sven Hübner Thorsten Matthias Milan Vucetic

The unique process of sheet-bulk metal forming (SBMF) represents a combination of sheet and bulk metal forming by inducing a three-dimensional material flow in sheet metals in a single forming stage. Within this paper two different applications of sheet-bulk metal forming are demonstrated. Hereby two different combined drawing and upsetting processes to realize parts with symmetrically and asymmetrically arranged functional elements are analysed. Finally, this contribution introduces a new machine technique which provides an improvement of the working accuracy of a forming machine and thus has a positive influence on the parts quality. The idea is to use electromagnetic ram guidance to counteract the displacement of the ram due to horizontal forming forces while forming of asymmetric parts.

Electromagnetic forming

Metal forming

Roll forming

Tola

10.4028/www.scientific.net/amr.769.229

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Citations (7)

Experimental investigations on the state of the friction-welded joint zone in steel hybrid components after process-relevant thermo-mechanical loadings

AIP conference proceedings (2016)

Bernd‐Arno Behrens Anas Bouguecha Milan Vucetic Ilya Peshekhodov T. Matthias

As a part of the newly established Collaborative Research Center 1153 (SFB 1153) "Process chain for the manufacturing of hybrid high-performance components by tailored forming" at the Leibniz Universität Hannover, the Institute of Forming Technology and Machines (IFUM) examines the influence of thermo-mechanical stresses on the reduced Young's modulus as well as the hardness of hybrid (steel-steel compound) joined semi-finished products. Currently the expertise in the production of bulk metal formed parts is limited to mono-materials. For manufacturing parts of hybrid materials and also for the methods of the new process routes, practical experience has to be gained. The subproject C1 within the collaborative research center 1153 with the short title "Failure Prediction" deals with the question, if the hybrid semi-finished products fulfill the thermo-mechanical demands or if they fail at the joining zone (JZ) during forging. For this purpose, stresses similar to those in the process were imposed on hybrid semi-finished products by torsion tests by using the thermo-mechanical test system Gleeble 3800. Afterwards, the specimens were examined metallographically and by nanoindentations with the help of a TriboIndenter TI950. Thus, first knowledge on the behaviour of thermo-mechanical stresses on the reduced Young's modulus and the hardness of hybrid joined semi-finished parts was gained.

10.1063/1.4963532

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Citations (16)

FEA-Based Optimisation of a Clinching Process with a Closed Single-Part Die Aimed at Damage Minimization in CR240BH-AlSi10MnMg Joints

Key engineering materials (2015)

Bernd‐Arno Behrens Anas Bouguecha Milan Vucetic Sven Hübner Deniz Yilkiran

The paper presents results of FEA-based optimisation of the tool design of a clinching process with a closed single-part die. The studied materials are the bake-hardening steel CR240BH, 1.5 mm thick, on the punch side and the die-cast aluminium alloy AlSi10MnMg, 2.95 mm thick, on the die side. The optimisation was aimed at suppression of cracks that appear at the bottom of the clinch joint in AlSi10MnMg in the case of using conventional tool designs. By varying geometry parameters of the tools it was possible to reduce crack probability, though along with slightly worse, but still acceptable geometry parameters of the clinch joint.

Hardening (computing)

Minification

10.4028/www.scientific.net/kem.651-653.1487

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Citations (16)

Numerical Validation of Analytical Biaxial True Stress—True Strain Curves from the Bulge Test

AIP conference proceedings (2011)

Milan Vucetic Anas Bouguecha Ilya Peshekhodov T. Götze T. Huinink

Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation M. Vucetic, A. Bouguecha, I. Peshekhodov, T. Götze, T. Huinink, H. Friebe, T. Möller, B.‐A. Behrens; Numerical Validation of Analytical Biaxial True Stress—True Strain Curves from the Bulge Test. AIP Conference Proceedings 22 August 2011; 1383 (1): 107–114. https://doi.org/10.1063/1.3623599 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAIP Publishing PortfolioAIP Conference Proceedings Search Advanced Search |Citation Search

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10.1063/1.3623599

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Citations (27)

Manufacturing of functional elements by sheet-bulk metal forming processes

Production Engineering (2016)

Daniel Gröbel R. Schulte Philipp Hildenbrand Michael Lechner Ulf Engel

Metal forming

10.1007/s11740-016-0662-y

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Citations (35)

Experimental Test and FEA of a Sheet Metal Forming Process of Composite Material and Steel Foil in Sandwich Design Using LS-DYNA

Key engineering materials (2015)

Bernd‐Arno Behrens Milan Vucetic Anke Neumann Tomasz Osiecki N. Grbic

A structural concept in multi-material design is used in the automotive industry with the aim of achieving significant weight reductions of conventional car bodies. In this respect, the specific use of steel foils and continuous fiber-reinforced thermoplastics represents an interesting material combination for the production of hybrid parts in sandwich design. This contribution deals with the experimental and numerical analysis of a conventional sheet metal forming process using a composite material based on Polyamide 6 (PA6) with unidirectional endless glass fiber reinforcement and HC220Y+ZE steel foil. A unidirectional composite plate is positioned between two steel foils in sandwich design and formed under appropriate temperature conditions. For the numerical analysis of the forming process the software LS-DYNA is used.

10.4028/www.scientific.net/kem.651-653.439

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Citations (28)