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Correction to: Properties of a superelastic NiTi shape memory alloy using laser powder bed fusion and adaptive scanning strategies

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Progress in Additive Manufacturing 2021年第1期7卷 139-139页

作者： Gustmann, Tobias Gutmann, Florian Wenz, Franziska Koch, Peter Stelzer, Ralph Drossel, Welf‑Guntram Korn, Hannes Fraunhofer Institute for Machine Tools and Forming Technology IWU Dresden Germany Fraunhofer Institute for High-Speed Dynamics (Ernst-Mach-Institut) EMI Freiburg Germany Fraunhofer Institute for Mechanics of Materials IWM Freiburg Germany Chair of Engineering Design and CAD Technical University Dresden Dresden Germany

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Kinematics of the Lumbo-Pelvic Complex under Different Loading Conditions

Kinematics of the Lumbo-Pelvic Complex under Different Loadi...

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作者： Weidling, Martin Voigt, Christian Wendler, Toni Heilemann, Martin Werner, Michael Jarvers, Jan-Sven Heyde, Christoph-E. Faculty of Medicine University of Leipzig Semmelweisstrasse 14 Leipzig Germany Faculty of Medicine University of Leipzig Leipzig Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Dresden Germany Department of Orthopaedic Trauma and Plastic Surgery University Hospital Leipzig Leipzig Germany

The lumbo-pelvic complex is a highly complex structural system. The current investigation aims to identify the kinematics between interacting bone segments under different loading conditions. A specimen of the lumbo-pelvic complex was obtained from a human body donor and tested in a self-developed test rig. The experimental setup was designed to imitate extension, flexion, right and left lateral bending and axial rotation to the left and to the right, respectively. The vertebra L3 was firmly embedded and load was introduced via hip joints. Using a digital image correlation (DIC) system, the 3D motions of 15 markers at different landmarks were measured for each loadcase under cyclic loading. For each loadcase, the kinematics were analyzed in terms of three-dimensional relative movements between L3 and the sacrum. The usefulness of the experimental technique was demonstrated. It may serve for further biomechanical investigations of relative motion of sacroiliac and vertebral joints and deformation of bony structures. © 2019 by Walter de Gruyter Berlin/Boston.

关键词： Kinematics

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Effect of sample geometry on the macroscopic shear deformation of the titanium alloy Ti-10V-2Fe-3Al subjected to quasi-static and dynamic compression-shear loading

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IOP Conference Series: Materials Science and Engineering 2021年第1期1147卷

作者： S Winter M Scholze M F-X Wagner Institute of Materials Science and Engineering Materials Science Group Chemnitz University of Technology 09125 Chemnitz Germany now at Fraunhofer Institute for Machine Tools and Forming Technology IWU 09126 Chemnitz Germany

We investigate the evolution of shear bands in a Ti-10V-3Fe-2Al alloy with three different initial microstructures: solution-annealed β-titanium, β-titanium with primary α-phase precipitates as well as a condition with primary and secondary α-phase precipitates. Quasi-static and dynamic testing of compression-shear specimens with strain rates of 10-3 s-1 and 102 s-1 is performed at room temperature. The influence of two different sample geometries on the macroscopic shearing tendency is investigated: samples with a cylindrical cross section and samples with a square cross section. The results of digital image correlation and the nominal stress-strain behavior under quasi-static and dynamic loading indicate a stronger localization tendency of the aged conditions with additional α-phase precipitates compared to the solution-annealed pure β-condition. Our results also demonstrate that compression-shear testing with samples with a square cross-section reduces facet loss, increases the resolution even at high strain rates and therefore allows to analyze strain distributions during shear band formation and propagation with higher accuracy.

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Nondestructive testing of composite fibre materials with hyperspectral imaging : Evaluative studies in the EU H2020 FibreEUse project

arXiv

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arXiv 2021年

作者： Yan, Yijun Ren, Jinchang Zhao, Huan Windmill, James F.C. Ijomah, Winifred de Wit, Jesper von Freeden, Justus National Subsea Centre Robert Gordon University Aberdeen United Kingdom Dept. of Electronic and Electrical Engineering University of Strathclyde Glasgow United Kingdom Dept of Design Manufacturing & Engineering Management University of Strathclyde Glasgow United Kingdom INVENT GmbH Christian-Pommer-Straße 47 Braunschweig38112 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Hermann-Münch-Str. 1 Wolfsburg38440 Germany

Through capturing spectral data from a wide frequency range along with the spatial information, hyperspectral imaging (HSI) can detect minor differences in terms of temperature, moisture and chemical composition. Therefore, HSI has been successfully applied in various applications, including remote sensing for security and defense, precision agriculture for vegetation and crop monitoring, food/drink, and pharmaceuticals quality control. However, for condition monitoring and damage detection in carbon fibre reinforced polymer (CFRP), the use of HSI is a relatively untouched area, as existing non-destructive testing (NDT) techniques focus mainly on delivering information about physical integrity of structures but not on material composition. To this end, HSI can provide a unique way to tackle this challenge. In this paper, with the use of a near-infrared HSI camera, applications of HSI for the non-destructive inspection of CFRP products are introduced, taking the EU H2020 FibreEUse project as the background. Technical challenges and solutions on three case studies are presented in detail, including adhesive residues detection, surface damage detection and Cobot based automated inspection. Experimental results have fully demonstrated the great potential of HSI and related vision techniques for NDT of CFRP, especially the potential to satisfy the industrial manufacturing environment. © 2021, CC BY.

关键词： Nondestructive examination

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Minimally-invasive lag screw fixation technique for posterior malleolus fractures: A cadaveric study

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Foot & Ankle Surgery: Techniques, Reports & Cases 2024年第2期4卷 100385-100385页

作者： Fullarton, M., MSc Vidakovic, H., FRACS Kieser, D.C., PhD, FRACS Hammer, N., PhD Wyatt, M.C., MD, FRACS University of Otago Department of Anatomy Dunedin New Zealand University of Otago Department of Orthopaedics and Musculoskeletal Medicine Christchurch New Zealand Medical University of Graz Division of Macroscopic and Clinical Anatomy Gottfried Schatz Research Center Graz Austria Department of Trauma Orthopedic and Plastic Surgery University Hospital of Leipzig Germany Fraunhofer Institute for Machine Tools and Forming Technology Division of Biomechatronics Dresden Germany College of Health Massey University New Zealand

AbstractAnatomical reduction and lag screw fixation of posterior malleolar (PM) ankle fractures typically involves an open posterolateral approach. The aim of this anatomical study was to assess whether a minimally-invasive, percutaneous posterior-to-anterior lag screw fixation technique is safe to perform. Eighteen cadaveric ankle specimens were used. A transverse incision was made at the lateral border of the Tendo Achilles (TA). Windows were made lateral to and through the substance of the TA and simulated reduction and placement of a single lag screw performed. Specimens were then fully dissected to ascertain proximity and damage to anatomical structures. Lag screw fixation was placed appropriately in all ankles. No injury to the neurovascular structures, ankle joint or syndesmotic ligaments was observed. The mean distance from the soft tissue window to sural nerve was 10.0 mm (range 5–16), and 9.5 mm to short saphenous vein (4–14). Whilst the muscle belly of flexor hallucis longus (FHL) was pierced in six specimens, no injuries to the FHL tendon were observed. The mean distance from screw to syndesmosis was 9.3 mm (range 3–15) and 12.7 mm to the ankle joint (7–17). This study demonstrates that posterior percutaneous lag screw fixation is both safe and accurate. Further work is required to evaluate the precision of reduction and the biomechanical stability of this fixation technique. This novel minimally-invasive technique may be beneficial in avoiding the wound complications associated with open posterolateral ankle approaches and also offer a functional advantage due to minimal soft tissue disruption.

关键词： Ankle joint Approach Fixation Posterior malleolus fracture Trauma V

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Modelling of surface formation mechanism during burnishing of aluminium

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Procedia CIRP 2019年 82卷 450-454页

作者： Rico Stöckmann Matthias Putz Technische Universität Chemnitz Institute for Machine Tools and Production Processes Reichenhainer Str. 70 09126 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Str. 88 09126 Chemnitz Germany

Burnishing is a finishing process which levels the roughness of machined surfaces and increases the hardness by micro-forming. In this paper, a novel two-dimensional finite element model for the diamond ball burnishing process on aluminium is presented, which allows a prediction of the surface structure. The force, step over distance, and tool geometry during the burnishing process are taken into account by the model and the results are verified by experimental investigations. The verification shows that the model is able to predict all geometrical surface aspects like roughness, sinking-in and bulge formation for reasonable process parameters.

关键词： Finite element method (FEM) Surface modification Burnishing

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Miniaturized parallel kinematic machine tool for the machining of small workpieces 18

Miniaturized parallel kinematic machine tool for the machini...

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18th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2018

作者： Georgi, Oliver Rentzsch, Hendrik Blau, Peter Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 Chemnitz09126 Germany

ISBN: (纸本)9780995775121

Machining small workpieces with large scale machine tools has several disadvantages such as high costs, low efficiency and higher sensitivity to errors. Miniaturizing the machine to workpiece scale is a suitable approach to overcome certain limitations. However, this measure also leads to significant changes in machine properties even if the kinematic structure remains unchanged. On the basis of a parallel kinematic machine tool the paper investigates size effects and machine characteristics during dimensioning and design process. Static stiffness of joint bearings and overall dynamic behaviour are analysed to derive and prove certain design measures. Furthermore the influence of miniaturization on structure synthesis and feed drive dimensioning is shown. The paper concludes with final design and specifications of the developed parallel kinematic machine tool. © 2018 CURRAN-CONFERENCE. All rights reserved.

关键词： machine tools

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Automatic bead position calculation for hem flange bonding

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Procedia Manufacturing 2019年 27卷 138-143页

作者： M. Eckert J. Weber B. Hecht W.-G. Drossel M. Rössinger Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 09126 Chemnitz Germany Volkswagen Aktiengesellschaft Brieffach 011/1326 38436 Wolfsburg Germany

This article deals with improving the planning of hem flange bonding in the car body manufacturing process. Particularly during the ramp-up of the plant, great effort is put into ensuring that the generated adhesive bond meets the quality requirements. Here, several challenges occur in parallel. This ranges from the specific adhesive design, a result of multi-dimensional and individually curved car body parts, to the multi-stage process chain, where the associated manufacturing equipment is complex. This intricacy is countered by a discrete analysis of the adhesive continuum. Based on an established method, the location where the adhesive must be applied is computed under consideration of contiguous contours, disturbance variables and applicability by the projected dispensing system. For this reason the performance of the involved machines is examined. The results of this new method comprise a robot path along which an application system is guided, and control commands for the latter. Finally, a validation proves that this way, the adhesive application can be designed in a shorter period of time and in high quality at an early stage of plant design.

关键词： Computer automated process planning (CAPP) Robot Hem flange bonding

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Investigating the influence of bending parameters on the springback behavior of ultra-high strength spring strips 26th

Investigating the influence of bending parameters on the spr...

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26th MEFORM Conference on Resource Efficient Materials and forming Technologies, 2018

作者： Richter, Karsten Reuther, Franz Müller, Roland Landgrebe, Dirk Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 Chemnitz09126 Germany

ISBN: (纸本)9783035712971

The spring industry has to process ultra-high strength spring strips of the steel grade 1.4310 (X10CrNi18-8). Springback during bending is a limiting factor for resource-efficient production processes in the so-called stamping bending technology. This paper reports a mainly experimental investigation on the influence of bending parameters on the evolving springback of spring strips of the grade 1.4310 with tensile strengths TS = 1500-1800 MPa. © 2018 Trans Tech Publications, Switzerland.

关键词： Stamping

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Detection of the Force Distribution Close to the Effective Site in forming machines for a Force Control

Detection of the Force Distribution Close to the Effective S...

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International Conference on Control, Mechatronics and Automation (ICCMA)

作者： A. Schleinitz A. Sewohl H. Schlegel M. Putz Department of Control and Feedback Control Technology Technische Universität Chemnitz Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz Germany

Ever higher demands are placed on the quality and complexity of formed sheet metal parts, whereby the efficiency of the processes may not be affected. Thus it becomes more difficult to ensure process stability. In order to reduce rejected parts it is necessary to improve forming technologies and processes. Closed loop control of process variables with an influence to the quality of a part is a promising approach. Therefor the reliable metrological acquisition of such a parameter is a basic requirement. forming force respectively force distribution has an influence on component quality and seems to be a suited value. In this paper, a measurement setup and its implementation in a demonstrator is described. First metrological examinations show occurring effects during eccentric load cases and the derivation of spindle forces via additional load paths in the machine frame. This knowledge will be used for the development of a force control.

关键词： Force Force measurement tools Presses Process control Sensor systems

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