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Deformation behaviors of four-layered U-shaped metallic bellows in hydroforming

Chinese Journal of Aeronautics 2020年第12期33卷 3479-3494页

作者： Jing LIU Zhiyong LV Yang LIU Lanyun LI Key Laboratory of Materials Processing Engineering School of Material Science and EngineeringXi'an Shiyou UniversityXi'an 710065China Key Laboratory of Advanced Manufacture Technology for Automobile Parts(Chongqing University of Technology) Ministry of EducationChongqing 400054China bime Bremen Institute of Mechanical EngineeringMAPEX Center for Materials and ProcessingUniversity of BremenBremen 28359Germany

Because of the complex constraint effects among layers in multi-layered metallic bellows hydroforming,the stress concentration and defects such as wrinkling and fracture may easily *** is a key to reveal the deformation behaviors in order to obtain a sound *** on the ABAQUS platform,a 3 D-FE model of the four-layered U-shaped metallic bellow hydroforming process is established and validated by *** stress and strain distributions,wall thickness variations and bellow profiles of each layer in the whole process,including bulging,folding and springback stages,are *** deformation behaviors of bellows under different forming conditions are *** is found that the wall thinning degrees of different layer vary after hydroforming,and is the largest for the inner layer and smallest for the outer *** folding stage,the wall thinning degree of the crown point increases lineally,and the difference among layers increases as the process *** displacements of the crown point decrease from the inner layer to the outer *** springback,the U-shaped cross section changes to a tongue shape,the change of convolution pitch is much larger than the change of convolution height,and the springback values of the inner layer are smaller than the outer *** increase in the internal pressure and die spacing cause the maximum wall thinning degree and springback *** changing of process parameters,bellows with deep convolution are easily encountered wall thinning during hydroforming and convolution distortion after *** research is helpful for precision forming of multi-layered bellows.

关键词： Deformation behaviors Four-layered U-shaped bellow Hydroforming Numerical simulation Springback

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Linked Micro Parts Referencing System

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Journal of Mechanics Engineering and Automation 2017年第1期7卷 44-49页

作者： Philipp Wilhelmi Christian Schenck Bemd Kuhfuss bime (Bremen Institute for Mechanical Engineering) MAPEX Center for Materials and Processing University of Bremen Bremen 28359 Germany

For simplified processing, micro parts are handled as linked parts. The length of the frame structure of these linked parts can change during a multi-stage production process especially when forming is included. Hence, the positions of individual parts are not constant within the linkage. An individual referencing of the parts becomes necessary in each production step. In this paper, a visual high-speed on-line part referencing system is presented and analyzed. Especially, the trade-off between the highest possible feed velocity and the demand of high accuracy in micro production is taken into account. In addition to this general characterization application related testing with stepwise positioning is performed.

关键词： Multi-stage micro part production linked parts visual referencing system.

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Uncertainty and Resolution of Speckle Photography on Micro Samples

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Nanomanufacturing and Metrology 2020年第2期3卷 91-104页

作者： Gabriela Alexe Andreas Tausendfreund Dirk Stobener Lasse Langstadtler Marius Herrmann Christian Schenck Andreas Fischer Bremen Institute for Metrology Automation and Quality Science(BIMAQ)University of BremenLinzer Str1328359 BremenGermany MAPEX Center for Materials and Processes University of BremenPostbox 33044028359 BremenGermany Bremen Institute for Mechanical Engineering(bime) University of BremenBadgasteiner StraBe 128359 BremenGermany

The efficient development of new materials with defined properties requires fast methods of testing low volumes of material,such as a high-throughput investigation of spherical metallic micro samples with varying compositions and structuring treatments.A classical material testing method for macro samples,the tensile test cannot be employed for analyzing the mechanical properties of spherical samples with diameters below 1 mm since there are currently no methods for holding and stretching them.A combination between the incremental electrohydraulic extrusion as stress actuation unit and the speckle photography as strain measuring method is presented for obtaining the required mechanical *** longitudinal strain is generated at stepwise extrusion through10 μ*** is unknown,whether the speckle strain measuring method is able to provide the necessary low uncertainty for the required resolution in the whole measuring ***,theoretical and experimental investigations of the deformation measurability using the speckle correlation method are presented,showing that local displacements up to 10 μm can be measured with a spatial resolution between 3 and 10μm depending on the displacement *** dominant effect influencing the measurement uncertainty for displacements at this high spatial resolution is the speckle noise,resulting into measurement uncertainties of less than 100 μ***,speckle photography is shown to be applicable for tensile test on micro samples.

关键词： Micro samples Speckle photography Electrohydraulic incremental micro forming

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Le Corbusier and Pierre Jeanneret’s Cité Frugès: The Polychromy Issues

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Journal of Civil Engineering and Architecture 2023年第11期17卷 557-563页

作者： Paola Scaramuzza ENSAV Ecole nationale superieure d’architecture Versailles Versailles 78000France A-bime Ancien Bâtiment InformatiséModéliséExpertisé Bouray sur Juine 91850France

From 1924 to1926,with the CitéFrugès in Pessac,Le Corbusier and Pierre Jeanneret realized an urban area as a laboratory where research on architecture polychromy was achieved among *** facade was applied as a tool to modify urban *** neighbourhood has always been inhabited and transformed by its inhabitants over *** the 90’s,studies for the global image protection of the neighbourhood included polychromy research conducted to restore the shades of ***,the colors have often been interpreted in various ***,besides the shade problems,other challenges have arisen linked to the preservation of the facade *** paper presents the recent archive research done to clarify the shade references and lay the groundwork so as to choose the right material to use and further research in the future.

关键词： Le Corbusier CitéFrugès polychromy architecture

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