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A pilot trial comparing the tear-out behavior in screw sockets and cemented polyethylene acetabular components – a cadaveric study

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Revue de Chirurgie Orthopedique et Traumatologique 2016年第6期102卷 530-530页

作者： Möbius, R. Schleifenbaum, S. Grunert, R. Löffler, S. Werner, M. Prietzel, T. Hammer, N. Institute of Anatomy University of Leipzig Faculty of Medicine Liebigstraße 13 Leipzig 04103 Germany Department of Orthopedics Trauma Surgery and Plastic Surgery University Hospital of Leipzig Liebigstraße 20 Leipzig 04103 Germany Fraunhofer Institute for Machine Tools and Forming Technology Nöthnitzer Straße 44 Dresden 01187 Germany HELIOS Clinic Blankenhain Germany Department of Anatomy University of Otago Lindo Ferguson Building 270 Great King St Dunedin 9016 New Zealand

Background The removal of well-fixed acetabular components following total hip arthroplasty (THA) is a difficult operation and could be accompanied by the loss of acetabular bone stock. The optimal method for fixation is still under debate. The aim of this pilot study was to compare the tear-out resistance and failure behavior between osseo-integrated and non-integrated screw cups. Furthermore, we examined examined whether there are differences in the properties mentioned between screw sockets and cemented polyethylene cups. Hypothesis Tear-out resistance and related mechanical work required for the tear-out of osseo-integrated screw sockets are higher than in non-integrated screw sockets. Patients and methods Ten human coxal bones from six cadavers with osseo-integrated screw sockets (n = 4), non-integrated (implanted postmortem, n = 3) screw sockets and cemented polyethylene cups (n = 3) were used for tear-out testing. The parameters axial failure load and mechanical work for tear-out were introduced as measures for determining the stability of acetabular components following THA. Results The osseo-integrated screw sockets yielded slightly higher tear-out resistance (1.61 ± 0.26 kN) and related mechanical work compared to the non-integrated screw sockets (1.23 ± 0.39 kN, P = 0.4). The cemented polyethylene cups yielded the lowest tear-out resistance with a failure load of 1.18 ± 0.24 kN. Compared to the screw cups implanted while alive, they also differ on a non-significant level (P = 0.1). Osseous failure patterns differed especially for the screw sockets compared to the cemented polyethylene cups. Discussion Osseo-integration did not greatly influence the tear-out stability in cementless screw sockets following axial loading. Furthermore, the strength of the bone–implant interface of cementless screw sockets appears to be similar to cemented polyethylene cups. However, given the high failure load, high mechanical load and because of the related bone failure

关键词： Acetabular component Acetabular revision Cementless fixation Osseo-integration Screw socket THA

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A novel tool design strategy for electromagnetic forming

A novel tool design strategy for electromagnetic forming

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WGP Congress 2014

作者： Neugebauer, Reimund Psyk, Verena Scheffler, Christian Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Strasse 88 Chemnitz Germany

ISBN: (纸本)9783038352457

To make the advantages of electromagnetic forming applicable for industrial manufacturing, a three step tool design strategy is suggested. At first, simplified decoupled electromagnetic and structural mechanical simulations are used for creating a preliminary design via a systematic iterative optimization process. The selected design is verified in more accurate coupled simulations. A prototypic realization serves for further optimization, if necessary. The applicability of the approach is proved on the basis of an inductor system for magnetic pulse welding of tubes. © (2014) Trans Tech Publications, Switzerland.

关键词： Metal forming

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Evaluation of the Technical-Economic Potential of Particle- Reinforced Aluminum Matrix Composites and Electrochemical Machining

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IOP Conference Series: Materials Science and Engineering 2016年第1期118卷

作者： A Schubert U Götze M Hackert-Oschätzchen N Lehnert F Herold G Meichsner A Schmidt Technische Universität Chemnitz Professorship Micromanufacturing Technology Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz Germany Technische Universität Chemnitz Professorship of Management Accounting and Control Chemnitz Germany franziska.herold@wirtschaft.tu-chemnitz.de

Compared to conventional cutting, the processing of materials by electrochemical machining offers some technical advantages like high surface quality, no thermal or mechanical impact on the work piece and preservation of the microstructure of the work piece material. From the economic point of view, the possibility of process parallelization and the absence of any process-related tool wear are mentionable advantages of electrochemical machining. In this study, based on experimental results, it will be evaluated to what extent the electrochemical machining is technically and economically suitable for the finish-machining of particle- reinforced aluminum matrix composites (AMCs). Initial studies showed that electrochemical machining - in contrast to other machining processes - has the potential to fulfil demanding requirements regarding precision and surface quality of products or components especially when applied to AMCs. In addition, the investigations show that processing of AMCs by electrochemical machining requires less energy than the electrochemical machining of stainless steel. Therefore, an evaluation of electrochemically machined AMCs - compared to stainless steel - from a technical and an economic perspective will be presented in this paper. The results show the potential of electro-chemically machined AMCs and contribute to the enhancement of instruments for technical-economic evaluations as well as a comprehensive innovation control.

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Characterisation of tool coatings for press hardening

Characterisation of tool coatings for press hardening

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6th International Conference on Tribology in Manufacturing Processes and Joining by Plastic Deformation, ICTMP 2014

作者： Müller, Roland Mosel, André Fraunhofer-Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 09126 Chemnitz Germany Chemnitz University of Technology Machine Tools and Forming Technology Straße der Nationen 62 09107 Chemnitz Germany

ISBN: (纸本)9783038351276

Hot sheet metal forming is gaining in importance in many fields, because of its capability to produce more complex components than possible with cold forming. Hot forming is also used to influence the final material properties with the hot forming of manganese-boron steels being a good example. One of the major challenges in hot forming is the tribological conditions between the tool and sheet material at the required high temperatures. This article will discuss the influence of different tool material coatings, ranging from PVD to mechanically bonded ceramic coatings, on the tribological conditions during forming. It will also shed light on how these coatings influence the heat transfer between the component´s material and the tool material. © (2014) Trans Tech Publications, Switzerland.

关键词： Heat transfer

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The suitability of analytical and numerical methods for developing clinching processes with thick sheet metal

The suitability of analytical and numerical methods for deve...

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WGP Congress 2012

作者： Israel, Markus Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz Germany

ISBN: (纸本)9783038350538

At present, the use of clinching is mainly restricted to thin sheet metal. Here the joining technology is used for assemblies in mass production due to its great coast efficiency. However, the branches of industry working with thick sheet metal (utility and rail vehicle engineering, shipbuilding and general structural steel engineering) represent a major potential for using clinching technology. Unfortunately, the suitability of clinching for connecting jobs with substantially greater sheet metal thicknesses has neither been sufficiently investigated, nor are there suitable toolsets among system manufacturers that are adapted to the larger overall sheet metal thicknesses. Instead, the state-of-the-art for ascertaining tools for larger sheet metal thicknesses and point dimensions is trial and error accepting the high costs caused by producing a large number of tools and experiments. This paper demonstrates some analytical approaches to this problem and how suitable they are to describing the process of clinching in comparison to the potential of calculation with FEA. © (2014) Trans Tech Publications, Switzerland.

关键词： Sheet metal

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Effect of new adhesion promoter and mechanical interlocking on bonding strength in metal-polymer composites

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IOP Conference Series: Materials Science and Engineering 2016年第1期118卷

作者： A Schuberth M Göring T Lindner G Töberling M Puschmann F Riedel I Scharf K Schreiter S Spange T Lampke Materials and Surface Engineering Group Institute of Materials Science and Engineering Technische Universität Chemnitz 09125 Chemnitz Germany Polymer Chemistry Technische Universität Chemnitz 09111 Chemnitz Germany Department of Joining and assembling Fraunhofer Institute for Machine Tools and Forming Technology IWU 09126 Chemnitz Germany

There are various opportunities to improve the adhesion between polymer and metal in metal-plastic composites. The addition of a bonding agent which reacts with both joining components at the interfaces of the composite can enhance the bonding strength. An alternative method for the adjustment of interfaces in metal-plastic composites is the specific surface structuring of the joining partners in order to exploit the mechanical interlock effect. In this study the potential of using an adhesion promoter based on twin polymerization for metal-plastic composites in combination with different methods of mechanical surface treatment is evaluated by using the tensile shear test. It is shown that the new adhesion promoter has a major effect when applied on smooth metal surfaces. A combination of both mechanical and chemical surface treatment of the metal part is mostly just as effective as the application of only one of these surface treatment methods.

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New Feature Extraction and Processing Methods for the Advanced Knowledge Based Process Planning of forming Operations

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Procedia CIRP 2015年 28卷 16-21页

作者： R. Neugebauer M. Werner M. Pröhl G. Brunnett T. Kühnert Fraunhofer Gesellschaft zur Förderung angewandter Forschung e. V. Postfach 20 07 33 80007 Munich Germany Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Straße 88 09126 Chemnitz Germany Department of Computer Science Technische Universität Chemnitz Straße der Nationen 62 09107 Chemnitz Germany

A new method for the automated extraction, recognition and interpretation of forming features is presented. The motivation is to apply knowledge based engineering (KBE) methods more intensively on process planning procedures for forging, tube hydroforming and sheet metal forming. With a new thinning method three-dimensional (3D) CAD data is reduced to a 1D skeleton graph. By curvature based segmentation of the surface and the neighborhood relations further information are provided. Depending on the gained classification, analyzing algorithms can be performed again with an adapted level of detail. Herewith the process planning can be supported on a much higher level than before. Video abstract Download : Download video (3MB)

关键词： Feature extraction Knowledge based engineering Process planning forming operations Forging Tube hydroforming Sheet metal forming

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Reducing blade manufacturing cost while maintaining aerodynamic performance of vertical axis wind turbines

Reducing blade manufacturing cost while maintaining aerodyna...

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European Wind Energy Association Conference and Exhibition 2014, EWEA 2014

作者： Domínguez, Diego Pröhl, Marco De Troyer, Tim Feng, Guoying Werner, Markus Runacres, Mark Department of Engineering Technology Vrije Universiteit Brussel Brussels Belgium Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany

Vertical axis wind turbines have experienced a renewed impulse during the last few years, with important research efforts focused on them. This work is focused in the development of new blade designs capable of notably reduce their manufacturing cost and, consequently, improve global profitability. Thanks to the aerodynamic and structural analyses that have been carried out, a final blade design has been achieved. It is based on the use of hydroforming manufacturing techniques with metal sheets, creating 3 meters blades to be used in a turbine capable of produce about 1kW. First estimations show that with the positive effects of a mass use and production (economies of scale), such metal blades have a 90 % reduction potential in their production costs compared to fibre-reinforced ones for single turbines.

关键词： Turbomachine blades

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Real 3D geometry and motion data as a basis for virtual design and testing 19

Real 3D geometry and motion data as a basis for virtual desi...

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19th CIRP Design Conference: Competitive Design

作者： Weidlich, D. Zickner, H. Riedel, T. Böhm, A. Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Strasse 70 D-09126 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz Reichenhainer Strasse 88 D-09126 Chemnitz Germany

ISBN: (纸本)9780955743641

A consistent and accurate digital data model takes a major role during the whole product life cycle of production facilities. This article introduces both technologies: 3D laser scanning for acquisition of 3D geometry date and motion capturing for real motion data with focus on the application in the product life cycle of production facilities. It gives an overview and comparison of different hard- And software solutions. Workflows for concrete tasks in the planning process show how both technologies can be combined and how the acquired data needs to be handled for the integration with CAD tools or Virtual Reality systems. Finally this article gives an outlook on the possible future development of these technologies. © Cranfield University 2009.

关键词： Virtual reality

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Fabrication Method for Series Production of Sheet Metal Parts with Integrated Piezoelectric Transducers

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Procedia technology 2014年 15卷 494-502页

作者： Matthias Nestler Welf-Guntram Drossel Sebastian Hensel Roland Müller Fraunhofer Institute for Machine Tools and Forming Technology IWU 09126 Chemnitz Germany

The paper presents a high volume compatible production method for the fabrication of sheet metal parts with integrated piezoelectric transducers. The functionality of the integrated piezomodule is shown on a wing assembly, consisting of two sheet metals shaped with roll bending and three point bending operations. The stimulation of the structure is performed with a shaker, the reduction of the acoustic noise was realized with the integrated piezomodule and monitored with vibrometer measurements. Impedance measurements were performed for health monitoring of the multiple bolted joint. Furthermore, a simulation of the structure was used for the determination of resonance frequencies. The results show a good correlation between experiment and simulation.

关键词： piezo-metal-compound adhesive MFC piecoelectic transducer vibration compensation health monitoring

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