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检索条件"任意字段=Proceedings of the 29th International ACM Conference on 3D Web Technology"

共 459 条记录，以下是131-140 订阅

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Fast prediction of thermal history in large-scale parts fabricated via a laser metal deposition process 29

Fast prediction of thermal history in large-scale parts fabr...

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29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018

作者： Yan, Lei Pan, Tan Newkirk, Joseph W. Liou, Frank thomas, Eric E. Baker, Andrew H. Castle, James B. Department of Mechanical and Aerospace Engineering Missouri University of Science and Technology RollaMO United States Department of Materials Science and Engineering Missouri University of Science and Technology RollaMO United States Boeing Company St. LouisMO United States

Laser metal deposition (LMd) has become a popular choice for the fabrication of near-net shape complex parts. Plastic deformation and residual stresses are common phenomena that are generated from the intrinsic large thermal gradients and high cooling rates in the process. Finite element analysis (FEA) is often used to predict the transient thermal cycle and optimize processing parameters;however, the process of predicting the thermal history in the LMd process with the FEA method is usually time-consuming, especially for large-scale parts. Herein, multiple 3d FEA models with simple assumptions on the heat source and its loading methods are compared and validated with experimental thermocouple data. © Solid Freeform Fabrication 2018: proceedings of the 29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018. All Rights Reserved.

关键词： thermocouples

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MM-Hand: 3d-Aware Multi-Modal Guided Hand Generation for 3d Hand Pose Synthesis 20

MM-Hand: 3D-Aware Multi-Modal Guided Hand Generation for 3D ...

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28th acm international conference on Multimedia, MM 2020

作者： Wu, Zhenyu Hoang, duc Lin, Shih-Yao Xie, Yusheng Chen, Liangjian Lin, Yen-Yu Wang, Zhangyang Fan, Wei Texas AandM University College StationTX United States Tencent America Palo AltoCA United States Amazon Web Services Palo AltoCA United States University of California Irvine IrvineCA United States National Chiao Tung University Hsinchu City Taiwan University of Texas at Austin AustinTX United States

ISBN: (纸本)9781450379885

Estimating the 3d hand pose from a monocular RGB image is important but challenging. A solution is training on large-scale RGB hand images with accurate 3d hand keypoint annotations. However, it is too expensive in practice. Instead, we develop a learning-based approach to synthesize realistic, diverse, and 3d pose-preserving hand images under the guidance of 3d pose information. We propose a 3d-aware multi-modal guided hand generative network (MM-Hand), together with a novel geometry-based curriculum learning strategy. Our extensive experimental results demonstrate that the 3d-annotated images generated by MM-Hand qualitatively and quantitatively outperform existing options. Moreover, the augmented data can consistently improve the quantitative performance of the state-of-the-art 3d hand pose estimators on two benchmark datasets. the code will be available at https://***/Scotthoang/mm-hand. © 2020 acm.

关键词： Curricula

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A sustainable additive approach for the achievement of tunable porosity 29

A sustainable additive approach for the achievement of tunab...

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29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018

作者： Lau, Sharon Yeazel, Taylor Miller, Ana Pfister, Nathan Rivero, Iris V. Department of Industrial and Manufacturing Systems Engineering Iowa State University AmesIA50010 United States Department of Materials Science and Engineering Iowa State University AmesIA50010 United States Department of Industrial and Systems Engineering Rochester Institute of Technology RochesterNY14623-5603 United States

this study aims to design a green additive approach for the fabrication of controlled porosity on hydrogels. Although hydrogels have been of common use in tissue engineering, the generation of controllable porosity remains an issue due to their swelling and degradation properties. Hydrogels in this study were fabricated by physical cross-linking and the porosity was generated by casting the solution in a 3d printed mold prior to physical cross-linking. this approach eliminates the use of chemical cross-linking compounds which are often toxic and not environmentally friendly. Polyvinyl alcohol was selected to validate this technique due to its biocompatibility and adequate mechanical properties. the microstructure, mechanical properties and deformation of the porous hydrogels were characterized. Results revealed that the proposed bioplotting technique reduced variation of pore size and allotted for the realization of controlled and tunable pore structures. © Solid Freeform Fabrication 2018: proceedings of the 29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018. All Rights Reserved.

关键词： Hydrogels

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Mini-cave automatic virtual environment application in security, safety, and defence studies 35

Mini-cave automatic virtual environment application in secur...

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35th international conference on Information Technologies, InfoTech 2021

作者： Gawlik-Kobylinska, Malgorzata Maciejewski, Pawel Lebiedz, Jacek Faculty of Management and Command War Studies University ul. Chruiciela 103 Warszawa00-910 Poland Czech Technical University in Prague Faculty of Civil Engineering Department of Construction Technology Thakurova 2077/7 Praha 6166 29 Czech Republic Gdańsk University of Technology Faculty of Electronics Telecommunications and Informatics Narutowicza 11/12 Gdańsk80-233 Poland

ISBN: (纸本)9781665403245

the aim of the article is to analyse the use of mini-Cave Automatic Virtual Reality Environment (mini-CAVE) in academic studies on security, safety, and defence. the literature review based on web of Science database and the case study of the War Studies University research activities indicated the mini-CAVE can be used in two areas as a research infrastructure and as a didactic tool. It can be concluded that due to the development of virtual reality worlds, the application of the mini-CAVE supports research and didactics activities, specifically in creating 3d scenarios for teaching concepts and processes, and simulating situations related to saving life and health. © 2021 IEEE.

关键词： Virtual reality

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Mandibular repositioning appliance following resection crossing the midline- A3d printed guide 29

Mandibular repositioning appliance following resection cross...

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29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018

作者： Malyala, Santosh Kumar Gibson, Ian Ravi Kumar, Y. Chakravarthy, Chitra Department of Mechanical Engineering National Institute of Technology Warangal Warangal Telangana India Fraunhofer Project Centre UT Twente Netherlands Department of Oral and Maxillofacial Surgery Navodaya Dental College and Hospital Raichur Karnataka India

Additive Manufacturing (AM) is one of the latest manufacturing processes which has evolved dramatically over the past three decades. the benefits of AM havesteadily stepped in to almost all modernindustries. the medical and dental industries may have benefitted the most in this regard. In the medical industry, every complex surgery has unique requirements in planning or execution, where it needs customized surgical guides or tools. In patients with mandibular tumors where a surgical resection is performed crossing the midline, currently there is no guide or tool available for repositioning the mandible to the patient's original anatomy. To overcome this, an attempt has been made to develop a customized repositioning appliance, which can be used for pre surgical planning and the same can be transferred to the patient during surgery. the repositioning appliance is developed using the patient's CT data which is then processed with the use of medical translation software. the final patient specific repositioning appliance is fabricated using AM technology. this guide has been used on the models of the jaws requiring resection to check their efficacy and the condylar repositioning has been seen to be close to the pre-surgical *** appliance is useful for pre-surgicalplanning, pre-bending and adaptation of the reconstruction plate to the mandible and also to reposition the condyles to their original positions after the resection. © Solid Freeform Fabrication 2018: proceedings of the 29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018. All Rights Reserved.

关键词： 3d printers

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Using additive manufacturing as a pathway to change the qualification paradigm 29

Using additive manufacturing as a pathway to change the qual...

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29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018

作者： Roach, R.A. Bishop, J.E. Johnson, K. Rodgers, T. Boyce, B.L. Swiler, L. van Bloemen Waanders, B. Chandross, M. Kammler, d. Balch, d. Jared, B. Martinez, M.J. Leathe, N. Ford, K. Sandia National Laboratories AlbuquerqueNM87123 United States

Additive Manufacturing (AM) offers the opportunity to transform design, manufacturing, and qualification with its unique capabilities. AM is a disruptive technology, allowing the capability to simultaneously create part and material while tightly controlling and monitoring the manufacturing process at the voxel level, with the inherent flexibility and agility in printing layer-by-layer. AM enables the possibility of measuring critical material and part parameters during manufacturing, thus changing the way we collect data, assess performance, and accept or qualify parts. It provides an opportunity to shift from the current iterative design-build-test qualification paradigm using traditional manufacturing processes to design-by-predictivity where requirements are addressed concurrently and rapidly. the new qualification paradigm driven by AM provides the opportunity to predict performance probabilistically, to optimally control the manufacturing process, and to implement accelerated cycles of learning. Exploiting these capabilities to realize a new uncertainty quantification-driven qualification that is rapid, flexible, and practical is the focus of this paper. © Solid Freeform Fabrication 2018: proceedings of the 29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018. All Rights Reserved.

关键词： 3d printers

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Binder jetting of high temperature and thermally conductive (aluminum nitride) ceramic 29

Binder jetting of high temperature and thermally conductive ...

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29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018

作者： diaz-Moreno, Carlos A. Rodarte, C. Ambriz, S. Bermudez, d. Roberson, d. Terrazas, C. Espalin, d. Ferguson, R. Shafirovich, E. Lin, Y. Wicker, Ryan B. W. M. Keck Center for 3D Innovation College of Engineering E-108 University of Texas at El Paso University Ave. 500 W El PasoTX79968 United States Department of Mechanical Engineering University of Texas at El Paso United States

this work reports on the novel fabrication of aluminum nitride (AlN) complex components using binder jetting, on the use of sintering and hot isostatic pressing (HIPing) to increase their density, and on the characterization of the printed material, including thermal conductivity. the HIPing parameters employed were a temperature of 1900 °C using a rich nitrogen atmosphere at a pressure of 30,000 psi during 8 h. Results show that the printed and HIPed AlN components had a 1.96 g/cm3 (60.12%) density when compared to theoretical values. the thermal conductivity for densified and HIPed components was measured in the range from 23 °C to 500 °C resulting in values from 4.82 W/m*K to 3.17 W/m*K, respectively. Characterization using scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction was used to investigate the ceramic structural morphology of the sintered and HIPed material, its chemical composition, and crystal structure of the binder jetting manufactured AlN components. © Solid Freeform Fabrication 2018: proceedings of the 29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018. All Rights Reserved.

关键词： Aluminum nitride

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A CAd-based workflow and mechanical characterization for additive manufacturing of tailored lattice structures 29

A CAD-based workflow and mechanical characterization for add...

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29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018

作者： Koch, P. Korn, H. Kordass, R. Holtzhausen, S. Schoene, C. Mueller, B. Stelzer, R. Institute of Machine Elements and Machine Design TU Dresden Dresden Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Dresden Germany

Lattice structures are highly recommended for lightweight applications and cost reduction in additive manufacturing (AM). Currently, parts with lattice structures are still mainly used for illustrative purposes and rarely in industrial products. One important reason is that, due to their high dependency on macro- and micro-geometry, the mechanical properties of manufactured structures are difficult to predict. thus, even and precise struts are needed. In this paper, a workflow for fabrication of lattice structures with strut-diameters from 150 µm to 400 µm on commercial laser beam melting (LBM) systems is presented. Based on a CAd-integrated user-interface for lattice design, a customized slicing algorithm determines database-aided suitable exposure parameters which ensure that the properties of the manufactured struts will just be as specified upon design. Subsequently, compression tests are performed in order to verify the established workflow. the developed tool enables designers to integrate AM-specific geometries into their components with little specific experience in AM. © Solid Freeform Fabrication 2018: proceedings of the 29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018. All Rights Reserved.

关键词： 3d printers

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Mechanical properties of Zr-based bulk metallic glass parts fabricated by laser-foil-printing additive manufacturing 29

Mechanical properties of Zr-based bulk metallic glass parts ...

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29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018

作者： Li, Yingqi Leu, Ming C. Tsai, Hai-Lung Department of Mechanical and Aerospace Engineering Missouri University of Science and Technology RollaMO65409 United States

the application of bulk metallic glasses (BMGs) has been traditionally limited to parts with small dimensions and simple geometries, due to the requirement of fast cooling during the conventional process of casting. this research exemplifies a promising additive manufacturing method, i.e., laser-foil-printing (LFP), to fabricate high-quality BMG parts with large dimensions and complex geometries. In this study, Zr52.5Ti5Al10Ni14.6Cu17.9 BMG parts were fabricated by LFP technology in which MG foils are laser welded layer-by-layer upon a substrate. the mechanical properties of the fabricated BMG parts were measured using micro-indentation, tensile test and four-point bending test, and then compared to as-cast BMG parts. through LFP, as rapid cooling rates can be achieved, fully amorphous and nearly fully dense BMG parts without cracking have been successfully made. the fabricated BMG parts exhibit mechanical properties, including micro-hardness, tensile strength, and flexural strength, comparable with the as-cast BMG parts. © Solid Freeform Fabrication 2018: proceedings of the 29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018. All Rights Reserved.

关键词： 3d printers

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development of pre-repair machining strategies for laser-aided metallic component remanufacturing 29

Development of pre-repair machining strategies for laser-aid...

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29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018

作者： Zhang, Xinchang Cui, Wenyuan Hill, Leon Li, Wei Liou, Frank Department of Mechanical and Aerospace Engineering Missouri University of Science and Technology RollaMO65409 United States

Remanufacturing worn metallic components can prolong the service life of parts that need frequent replacement but are extremely costly to manufacture, such as aircraft titanium components, casting dies. Additive manufacturing (AM) technology enables the repair of such valuable components by depositing filler materials at the worn area layer by layer to regenerate the missing geometry. In general, damaged parts would be inspected and pre-machined prior to material deposition to remove oil, residue, oxidized layers or defects located in inaccessible regions. therefore, the motivation of this paper is to introduce pre-repair machining strategies for removing contaminated materials from damaged components and materials surrounding inaccessible defects to ensure that the target damage is repairable. the current research targets at common failures comprising surface indentations, erosion, corrosion, wear and cracking, and the machining strategies for each defect were proposed. Each strategy takes the 3d scanned damaged model as input and the cut-off volume around the defects is defined by using different approaches. Pre-repair machining toolpath and program were generated based on the defined cut-off volume and finally, damaged parts were machined using the proposed strategies. © Solid Freeform Fabrication 2018: proceedings of the 29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018. All Rights Reserved.

关键词： Repair

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