Search results for: A. Bouguecha

Items from 1 to 20 out of 32 results

article

Ermüdungslebensdauerbewertung von Warmumformwerkzeugen – Ein Überblick über den Stand der Forschung und Anwendung

A. Jilg, T. Seifert, A. Bouguecha

Materialwissenschaft und Werkstofftechnik > 48 > 11 > 1057 - 1069

Warmumformwerkzeuge unterliegen während des Betriebes komplexen thermischen und mechanischen Beanspruchungen. In kritischen Bereichen können dadurch lokal Spannungen entstehen, die die Fließgrenze überschreiten. Bei der Serienproduktion führt dies zu zyklischen plastischen Verformungen und zur thermomechanischen Ermüdung, welche die Lebensdauer der Warmumformwerkzeuge maßgeblich bestimmen kann. Zur...

article

Comparative measurements of bone mineral density and bone contrast values in canine femora using dual-energy X-ray absorptiometry and conventional digital radiography

K. Lucas, I. Nolte, V. Galindo-Zamora, M. Lerch, more

BMC Veterinary Research > 2017 > 13 > 1 > 1-9

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 quantitative evaluation of bone mineral density, whereas in veterinary medicine conventional radiography is used for follow-up studies. Recently, a method has been described using digital...

article

Wear behaviour of thermally oxidised tool surfaces as low-friction separation layers for dry sheet metal forming

D. Yilkiran, D. Wulff, A. Almohallami, F. Özkaya, more

Wear > 2017 > 376-377 > PB > 1789-1803

This paper presents the results and analysis of wear investigations carried out on a wear test bench with high strength sheet metal DP600+Z drawn over selectively oxidised α-Fe₂O₃ tool steel surfaces. Wear investigations were carried out with several selectively oxidised specimens by varying the pulling and counter force, and thus the surface pressure on the samples. This allowed for a systematic...

article

Numerical Investigation of the Oxide Scale Deformation Behaviour with Consideration of Carbon Content during Hot Forging

B.-A. Behrens, R. Kawalla, B. Awiszus, A. Bouguecha, more

Procedia Engineering > 2017 > 207 > C > 526-531

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 processes with finite element based numerical methods realistic models are required which consider the detailed mathematical description of the material behaviour during the forging...

article

Creating load-adapted mechanical joints between tubes and sheets by controlling the material flow under plastically unstable tube upsetting

A. Sviridov, M. Rusch, A. Almohallami, C. Bonk, more

Procedia Engineering > 2017 > 207 > C > 968-973

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. Several investigations in the past have shown that joints between tubes and sheets or plates can be manufactured by upsetting operations. Under axial compression, the tube develops...

article

Experimental investigations on the transformation-induced plasticity in a high tensile steel under varying thermo-mechanical loading

B. -A. Behrens, A. Bouguecha, C. Bonk, A. Chugreev

Computer Methods in Materials Science > 2017 > Vol. 17, No. 1 > 36--43

Transformation-induced plasticity (TRIP) also known as transformation plasticity (TP) occurs during solid state phase transformation in the case of applied stress and may lead to irreversible macroscopic distortions in steel components after heat treatment. Particularly, in the context of cost-efficient hot forging, where heat treatment is integrated in the process chain, various complex stress states...

article

Potentials of in situ monitoring of aluminum alloy forging by acoustic emission

B. A. Behrens, A. Bouguecha, C. Buse, K. Wolki, more

Archives of Civil and Mechanical Engineering > 2016 > Vol. 16, no. 4 > 724--733

Deviations during forging processes lead to workpiece failure when the forming limits of the material are exceeded. In production processes an early detection of manufacturing faults is preferred. The acoustic emission (AE) technique is examined with respect to its ability to detect deviations in lubrication conditions and in the structural integrity of different aluminum part geometries and alloys...

article

Design and manufacturing of a human standardised hip cup out of titanium

B. A. Behrens, S. B. Escobar, H. Niemeier, M. Vucetic, more

Materialwissenschaft und Werkstofftechnik > 47 > 7 > 608 - 622

Background: In recent years, the use of hip prostheses has become a routine procedure. Despite this experience and good clinical results different complications arise which have a negative influence on the lifetime of prostheses. Especially the migration or loosening of the hip cup prosthesis due to strain adaptive bone remodelling is still a problem. Patient‐individual prostheses represent a possible...

chapter

New Strategies in Finite Element Analysis of Material Processing

B. -A. Behrens, A. Bouguecha, K. B. Sidhu, T. Matthias, more

Lecture Notes in Applied and Computational Mechanics > Modelling, Simulation and Software Concepts for Scientific-Technological Problems > 117-131

Under the supervision of Professor Bernd-Arno Behrens, the head of the Institute of Metal Forming and Metal-Forming Machines (IFUM), three PhD projects were carried out during the span of the Research Training Group 615 (GRK 615). All the projects originated in the Department of Numerical Methods, which is headed by Dr. Anas Bouguecha, and were related to finite element modeling and simulation of...

chapter

Numerical Investigations of the Strain-Adaptive Bone Remodeling in the Prosthetic Pelvis

A. Bouguecha, I. Elgaly, C. Stukenborg-Colsman, M. Lerch, more

IFMBE Proceedings > XII Mediterranean Conference on Medical and Biological Engineering and Computing 2010 > Biomedical Measurements and Modeling > 562-565

Bone remodeling due to stress shielding is a major cause of hip implants aseptic loosening. Previously, investigations on this phenomenon were based mainly on clinical observations. Currently, the finite element method (FEM) has been established as a reliable and efficient computing method to examine stress shielding after total hip arthroplasty and the related bone remodeling in the prosthetic Femur...

chapter

Femoral Load Change and Caused Bone Remodeling after Hip Arthroplasty

B. -A. Behrens, C. Stukenborg-Colsman, I. Nolte, P. Wefstaedt, more

IFMBE Proceedings > World Congress on Medical Physics and Biomedical Engineering, September 7 - 12, 2009, Munich, Germany > 77-80

Stress shielding in bone tissue as a result of total hip arthroplasty (THA) as well as the subsequent bone remodeling may lead to aseptic loosening of the prosthesis causing serious problems to patients with artificial joint. The study presented here aims to determine the load change and the resulting bone remodeling in the periprosthetic femur using the finite element analysis (FEA). ...

article

Numerical Investigation for the Design of a Hot Forging Die with Integrated Cooling Channels

B.-A. Behrens, A. Bouguecha, M. Vucetic, M. Bonhage, more

Procedia Technology > 2016 > 26 > C > 51-58

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 forging die. The primary objective of sub-project E3 is to develop a forging die which can “feel”, “learn” and “control” autonomous reactions to process variations. The current...

article

Overview and comparison of various test methods to determine formability of a sheet metal cut‐edge and approaches to the test results application in forming analysis

M. Schneider, A. Geffert, I. Peshekhodov, A. Bouguecha, more

Materialwissenschaft und Werkstofftechnik > 46 > 12 > 1196 - 1217

This paper presents an overview of published test methods for determination of formability of a sheet metal cut‐edge. The presented test methods were developed to evaluate formability of a sheet metal edge that was produced by shear cutting. Due to high local strains, hardening, or even microcracks, the cut‐edge might have less formability than the base material. The presentation of the tests is structured...

article

Numerische Betrachtung der biomechanischen Komplikationen begleitend zur Totalhüftgelenkprothese: Knochenumbau und Prothesenmigration

B.‐A. Behrens, A. Bouguecha, M. Vucetic, S. Betancur Escobar, more

Materialwissenschaft und Werkstofftechnik > 46 > 9 > 881 - 893

Die aseptische Lockerung der Prothese stellt immer noch ein Problem bei der Hüftgelenkprothese dar. Die Lockerung kann u. a. durch den Knochenumbau um die Prothese aufgrund von Stressabschirmung verursacht werden. Ein numerisches Modell wurde am Institut für Umformtechnik und Umformmaschinen der Leibniz Universität Hannover entwickelt, um den Knochenumbauprozess nach der Belastungsabschirmung abzubilden...

article

Fertigung einer universellen Hüftprothesenpfanne mittels Hochdruckblechumformung

B.‐A. Behrens, S. Betancur Escobar, H. Niemeier, A. Almohallami, more

Materialwissenschaft und Werkstofftechnik > 46 > 9 > 894 - 910

Der Einsatz von Hüftendoprothesen hat sich in den letzten Jahren als Routineeingriff entwickelt. Trotz dieser Erfahrung kommt es immer wieder zu Komplikationen. Besonders die Migration oder Lockerung der künstlichen Hüftpfannenkomponente aufgrund des belastungsadaptiven Knochenumbaus ist immer noch ein aktuelles Problem. Dies ist auf die veränderte mechanische Situation nach der Implantation der Prothese...

article

Ermittlung von Verfahrensgrenzen für das Fügen durch Knickbauchen anhand des Werkstoffes E235+N

B. Viehweger, A. Sviridov, P. Grützner, B.‐A. Behrens, more

Materialwissenschaft und Werkstofftechnik > 46 > 8 > 804 - 812

Durch eine systematische Vorgehensweise und den konsequenten Abgleich der Ergebnisse aus experimentellen und numerischen Untersuchungen konnte zunächst ein tiefgreifendes Verständnis für die beim Knickbauchen wirksamen Mechanismen entwickelt und daraus abgeleitete Verfahrensgrenzen ermittelt und in Form eines Arbeitsdiagrammes für den Werkstoff E235+N dargestellt werden. Im Hinblick auf eine breite...

article

Numerische Berechnung des Verschleißes an der Dornwalze eines Ringwalzprozesses in Abhängigkeit prozessrelevanter Parameter

B.‐A. Behrens, I. Lütke‐Verspohl, A. Bouguecha, T. Matthias

Materialwissenschaft und Werkstofftechnik > 45 > 7 > 591 - 599

Ringwalzen ist ein Umformprozess zur Herstellung nahtloser Ringe. Der Prozess kennzeichnet sich durch eine komplexe Kinematik der formgebenden Walzen und der Zentrierwalzen. Bei der Auslegung eines Ringwalzprozesses ist es erforderlich, die Vorringgeometrie und die Walzstrategie, d. h. die Vorschübe und Drehzahlen der einzelnen Walzen, so aufeinander abzustimmen, dass die geforderte Endkontur möglichst...

article

Verbund‐Gießschmieden hybrider Aluminiumbauteile

K.‐G. Kosch, P. Freytag, T. Matthias, K. Kerber, more

Materialwissenschaft und Werkstofftechnik > 44 > 10 > 819 - 824

Beim Verbund‐Gießschmieden hybrider Aluminiumbauteile werden die positiven Eigenschaften der Verfahren Gießen und Schmieden sowie unterschiedliche Werkstoffe miteinander kombiniert. Dies ermöglicht es Bauteile mit komplexer Geometrie und lokal unterschiedlichen Eigenschaften herzustellen. Bauteilbereiche mit hoher Komplexität (z.B. mit Hinterschnitt) werden gegossen. Bereiche, die im Betrieb hohen...

article

Untersuchung des Fließverhaltens der Magnesiumknetlegie‐rung AZ31 mit Hilfe von Schichtstauch‐ und Zugversuchen

B.‐A. Behrens, A. Bouguecha, T. Huinink, I. Peshekhodov, more

Materialwissenschaft und Werkstofftechnik > 44 > 9 > 760 - 767

Die Prozessauslegung von Umformprozessen wird durch Simulationssoftware unterstützt. Um realitätsnahe Simulationsergebnisse zu erhalten, müssen die verwendeten Werkstoffmodelle jedoch mit Hilfe einer umfangreichen Werkstoffcharakterisierung aufgebaut werden. Insbesondere Magnesiumknetlegierungen sind hierbei noch nicht ausreichend untersucht. Besonders die Aufnahmen von Fließkurven bis zu höheren...

article

Numerical analysis of draw bending of load-adapted sheet metal profiles

B.-A. Behrens, A. Bouguecha, J. Rosenberger, T. Matthias

Production Engineering > 2013 > 7 > 6 > 629-637

In comparison to traditional roll forming processes, draw bending process represents a flexible and inexpensive production of open sheet metal profiles. Draw bending technologies allow the fabrication of load-adapted parts for applications in lightweight design. It enables the fabrication for predominantly bearing-like parts with adjustable cross sections along the longitudinal axis. This paper introduces...

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Search results for: A. Bouguecha

Ermüdungslebensdauerbewertung von Warmumformwerkzeugen – Ein Überblick über den Stand der Forschung und Anwendung

Comparative measurements of bone mineral density and bone contrast values in canine femora using dual-energy X-ray absorptiometry and conventional digital radiography

Wear behaviour of thermally oxidised tool surfaces as low-friction separation layers for dry sheet metal forming

Numerical Investigation of the Oxide Scale Deformation Behaviour with Consideration of Carbon Content during Hot Forging

Creating load-adapted mechanical joints between tubes and sheets by controlling the material flow under plastically unstable tube upsetting

Experimental investigations on the transformation-induced plasticity in a high tensile steel under varying thermo-mechanical loading

Potentials of in situ monitoring of aluminum alloy forging by acoustic emission

Design and manufacturing of a human standardised hip cup out of titanium

New Strategies in Finite Element Analysis of Material Processing

Numerical Investigations of the Strain-Adaptive Bone Remodeling in the Prosthetic Pelvis

Femoral Load Change and Caused Bone Remodeling after Hip Arthroplasty

Numerical Investigation for the Design of a Hot Forging Die with Integrated Cooling Channels

Overview and comparison of various test methods to determine formability of a sheet metal cut‐edge and approaches to the test results application in forming analysis

Numerische Betrachtung der biomechanischen Komplikationen begleitend zur Totalhüftgelenkprothese: Knochenumbau und Prothesenmigration

Fertigung einer universellen Hüftprothesenpfanne mittels Hochdruckblechumformung

Ermittlung von Verfahrensgrenzen für das Fügen durch Knickbauchen anhand des Werkstoffes E235+N

Numerische Berechnung des Verschleißes an der Dornwalze eines Ringwalzprozesses in Abhängigkeit prozessrelevanter Parameter

Verbund‐Gießschmieden hybrider Aluminiumbauteile

Untersuchung des Fließverhaltens der Magnesiumknetlegie‐rung AZ31 mit Hilfe von Schichtstauch‐ und Zugversuchen

Numerical analysis of draw bending of load-adapted sheet metal profiles

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