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Selection of digital fabrication technique in the construction industry—A multi-criteria decision-making

Frontiers of Structural and Civil Engineering 2024, Volume 18, Issue 7,   Pages 977-997 doi: 10.1007/s11709-024-1075-1

Abstract: Digital fabrication techniques, in recent decades, have provided the basis of a sustainable revolutionHowever, selecting the digital fabrication method in terms of manufacturability and functionality requirementsThis paper presents alternatives and criteria for selection of digital fabrication techniques by adoptingThe given ranking is based on the current condition of digital fabrication in the construction industryThe study reveals that in the selection of digital fabrication techniques, the criteria including reinforcement

Keywords： digital fabrication     multicriteria decision-making     concrete 3D printing    

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Materials-oriented integrated design and construction of structures in civil engineering—A review

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 1,   Pages 24-44 doi: 10.1007/s11709-021-0794-9

Abstract: Design is a goal-oriented planning activity for creating products, processes, and systems with desired functions through specifications. It is a decision-making exploration: the design outcome may vary greatly depending on the designer’s knowledge and philosophy. Integrated design is one type of design philosophy that takes an interdisciplinary and holistic approach. In civil engineering, structural design is such an activity for creating buildings and infrastructures. Recently, structural design in many countries has emphasized a performance-based philosophy that simultaneously considers a structure’s safety, durability, serviceability, and sustainability. Consequently, integrated design in civil engineering has become more popular, useful, and important. Material-oriented integrated design and construction of structures (MIDCS) combine materials engineering and structural engineering in the design stage: it fully utilizes the strengths of materials by selecting the most suitable structural forms and construction methodologies. This paper will explore real-world examples of MIDCS, including the realization of MIDCS in timber seismic-resistant structures, masonry arch structures, long-span steel bridges, prefabricated/on-site extruded light-weight steel structures, fiber-reinforced cementitious composites structures, and fiber-reinforced polymer bridge decks. Additionally, advanced material design methods such as bioinspired design and structure construction technology of additive manufacturing are briefly reviewed and discussed to demonstrate how MIDCS can combine materials and structures. A unified strength-durability design theory is also introduced, which is a human-centric, interdisciplinary, and holistic approach to the description and development of any civil infrastructure and includes all processes directly involved in the life cycle of the infrastructure. Finally, this paper lays out future research directions for further development in the field.

Keywords： and construction     fiber-reinforced concrete     fiber-reinforced polymer     light-weight steel structures     digitalfabrication     composites    

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Geometric quality evaluation of three-dimensional printable concrete using computational fluid dynamics

Frontiers of Structural and Civil Engineering 2024, Volume 18, Issue 7,   Pages 963-976 doi: 10.1007/s11709-024-1080-4

Abstract: The importance of geometrical control of three dimensional (3D) printable concrete without the support of formwork is widely acknowledged. In this study, a numerical model based on computational fluid dynamics was developed to evaluate the geometrical quality of a 3D printed layer. The numerical results were compared, using image analysis, with physical cross-sectional sawn samples. The influence of printing parameters (printing speed, nozzle height, and nozzle diameter) and the rheological behavior of printed materials (yield stress), on the geometrical quality of one printed layer was investigated. In addition, the yield zone of the printed layer was analyzed, giving insights on the critical factors for geometrical control in 3D concrete printing. Results indicated that the developed model can precisely describe the extrusion process, as well as the cross-sectional quality.

Keywords： digital fabrication     3D concrete printing     geometric quality     computational fluid dynamics     printing    

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Mesoscale fabrication of a complex surface for integral impeller blades

Xibin WANG,Tianfeng ZHOU,Lijing XIE,Li JIAO,Zhibing LIU,Zhiqiang LIANG,Pei YAN

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 1,   Pages 116-131 doi: 10.1007/s11465-017-0426-1

Abstract: For the fabrication of a complex integral impeller, a micro-ball-end mill is designed in accordance with

Keywords： mesoscale fabrication     micro-milling tool     mesoscale milling     impeller blade    

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Design, fabrication, and characterization of hierarchical mechanical metamaterials

Frontiers of Mechanical Engineering 2024, Volume 19, Issue 1, doi: 10.1007/s11465-023-0776-9

Abstract: Natural mechanical materials, such as bamboo and bone, often exhibit superior specific mechanical properties due to their hierarchical porous architectures. Using the principle of hierarchy as inspiration can facilitate the development of hierarchical mechanical metamaterials (HMMs) across multiple length scales via 3D printing. In this work, we propose self-similar HMMs that combine octet-truss (OCT) architecture as the first and second orders, with cubic architecture as the third or more orders. These HMMs were fabricated using stereolithography 3D printing, with the length sizes ranging from approximately 200 µm to the centimeter scale. The compressive stress–strain behaviors of HMMs exhibit a zigzag characteristic, and the toughness and energy absorption can be significantly enhanced by the hierarchical architecture. The compressive moduli are comparable to that of natural materials, and the strengths are superior to that of most polymer/metal foams, alumina hollow/carbon lattices, and other natural materials. Furthermore, the flexural stress–strain curves exhibit a nonlinear behavior, which can be attributed to the hierarchical architecture and local damage propagation. The relatively high mechanical properties can be attributed to the synergistic effect of the stretch-dominated OCT architecture and the bending-dominated cube architecture. Lastly, an ultralight HMM-integrated unmanned aerial vehicle (HMM-UAV) was successfully designed and printed. The HMM-UAV is ~85% lighter than its bulk counterpart, remarkably extending the flight duration time (~53%). This work not only provides an effective design strategy for HMMs but also further expands the application benchmark of HMMs.

Keywords： 3D printing     mechanical metamaterials     hierarchical architecture     mechanical behavior     unmanned aerial vehicle (UAV)    

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A multi-probe micro-fabrication apparatus based on the friction-induced fabrication method

Zhijiang WU, Chenfei SONG, Jian GUO, Bingjun YU, Linmao QIAN

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 4,   Pages 333-339 doi: 10.1007/s11465-013-0276-4

Abstract:

A novel multi-probe micro-fabrication apparatus was developed based on the friction-induced fabricationWith a motorized linear stage, the maximum fabrication area of 50 mm × 50 mm can be achieved, andThe cantilever was designed as a structure of deformable parallelogram with two beams, by which the fabricationAs a low-cost and high efficiency fabrication device, the multi-probe micro-fabrication apparatus mayencourage the development of friction-induced fabrication method and shed new light on the texture engineering

Keywords： friction-induced fabrication     silicon     surface texture     friction     multi-probe    

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Development trend of urban design in “digital age”: Pan-dimensionality and individual-ubiquity

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 3,   Pages 569-575 doi: 10.1007/s11709-021-0735-7

Abstract: The wave of “digital age” featuring digital information is coming.Digital technology is profoundly changing the societal development direction and evolution paths.creation and adaptation of material space forms that integrate humanities, art, technology and materials, digitalThe result of this evolution is “digital urban design paradigm based on human-computer interaction”,

Keywords： digital age     urban design     multiple objectives     human-computer interaction     pan-dimensionality     individual-ubiquity    

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Precision glass molding: Toward an optimal fabrication of optical lenses

Liangchi ZHANG,Weidong LIU

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 1,   Pages 3-17 doi: 10.1007/s11465-017-0408-3

Abstract:

It is costly and time consuming to use machining processes, such as grinding, polishing and lapping, to produce optical glass lenses with complex features. Precision glass molding (PGM) has thus been developed to realize an efficient manufacture of such optical components in a single step. However, PGM faces various technical challenges. For example, a PGM process must be carried out within the super-cooled region of optical glass above its glass transition temperature, in which the material has an unstable non-equilibrium structure. Within a narrow window of allowable temperature variation, the glass viscosity can change from 105 to 1012 Pa·s due to the kinetic fragility of the super-cooled liquid. This makes a PGM process sensitive to its molding temperature. In addition, because of the structural relaxation in this temperature window, the atomic structure that governs the material properties is strongly dependent on time and thermal history. Such complexity often leads to residual stresses and shape distortion in a lens molded, causing unexpected changes in density and refractive index. This review will discuss some of the central issues in PGM processes and provide a method based on a manufacturing chain consideration from mold material selection, property and deformation characterization of optical glass to process optimization. The realization of such optimization is a necessary step for the Industry 4.0 of PGM.

Keywords： precision glass molding     optical lens     constitutive modeling     optimization     manufacturing chain     Industry 4.0    

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Platform governance in the era of AI and the digital economy

Frontiers of Engineering Management 2023, Volume 10, Issue 1,   Pages 177-182 doi: 10.1007/s42524-022-0241-1

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Revisiting digital twins: Origins, fundamentals, and practices

Frontiers of Engineering Management 2022, Volume 9, Issue 4,   Pages 668-676 doi: 10.1007/s42524-022-0216-2

Abstract: The digital twins (DT) has quickly become a hot topic since it was proposed.

Keywords： virtual manufacturing     digital twins     modeling and simulation     digitization     computational engineering    

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Improve the industrial digital transformation through Industrial Internet platforms

Frontiers of Engineering Management 2024, Volume 11, Issue 1,   Pages 167-174 doi: 10.1007/s42524-023-0286-9

Abstract: Improve the industrial digital transformation through Industrial Internet platforms

Keywords： industrial digital transformation     Industrial Internet platform     manufacturing     big data    

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A chemical etching route to controllable fabrication of TiO

Weixin ZHANG, Jie XING, Zeheng YANG, Mei KONG, Hongxu YAO

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 2,   Pages 192-201 doi: 10.1007/s11705-013-1319-4

Abstract: The TiO hollow nanospheres with diameters of about 230 nm were prepared by a simple and controllable route based on hydrolysis of Ti(OBu) on the surfaces of the Cu O solid nanospheres followed by inward etching of the Cu O nanospheres. The as-prepared samples were characterized by X-ray diffraction, transmission electron microscopy and scanning electron microscopy. The further post-heat treatment led to the high crystallization of the TiO hollow nanospheres. The photocatalytic performances of these samples were evaluated for the photodegradation of rhodamine B (RhB) under UV-light irradiation. The as-prepared TiO hollow nanospheres showed higher photocatalytic activity than the CuO and the CuO/TiO hollow nanospheres. Effects of temperature and time for post-heat treatment of TiO as well as initial RhB concentrations on the RhB photodegradation have also been studied. The results show that the TiO hollow nanospheres have the good reusability as photocatalysts and are promising in waste water treatment.

Keywords： TiO2     hollow nanospheres     rhodamine B     photocatalytic activity    

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Solid-state-reaction fabrication and properties of a high-doping Nd:YAG transparent laser ceramic

WU Yusong, LI Jiang, PAN Yubai, LIU Wenbin, AN Liqiong, WANG Shiwei, GUO Jingkun

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 3,   Pages 248-252 doi: 10.1007/s11705-008-0048-6

Abstract: High-quality neodymium-doped yttrium aluminum garnet (Nd:YAG) transparent ceramic (4.0 mole percent) was fabricated by a solid-state reaction method and vacuum sintering. The microstructure, optical transmittance, spectral properties and laser performance were investigated. The average grain size of the sample is about 10 ?m. The transmittance of a 2.8-mm thick sample reaches 79.5% at the laser wavelength of 1064 nm. The highest absorption peak is centered at 807 nm and the absorption coefficient is 13.9 cm. The absorption coefficient at the laser wavelength is 0.2 cm. The main emission peak is at 1064 nm and the fluorescence lifetime is 102 ?s. A laser diode (808 nm) whose maximum output is about 1000 mW was used as a pump source and an end-pumped laser experiment was performed. The 1064 nm-CW-laser output was obtained and the threshold is 733 mW. With 998 mW of maximum absorbed pump power, a laser output of 17 mW is obtained with a slope efficiency of 6.1%.

Keywords： neodymium-doped yttrium     maximum absorbed     microstructure     fluorescence lifetime     threshold    

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Examining the nexus of blockchain technology and digital twins: Bibliometric evidence and research trends

Frontiers of Engineering Management doi: 10.1007/s42524-024-0306-4

Abstract: The integration of Blockchain Technology (BT) with Digital Twins (DTs) is becoming increasingly recognized

Keywords： blockchain technology     digital twin     literature review     bibliometric analysis     research trend    

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Micro-optical fabrication by ultraprecision diamond machining and precision molding

Hui LI, Likai LI, Neil J. NAPLES, Jeffrey W. ROBLEE, Allen Y. YI

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 2,   Pages 181-192 doi: 10.1007/s11465-017-0444-z

Abstract:

Ultraprecision diamond machining and high volume molding for affordable high precision high performance optical elements are becoming a viable process in optical industry for low cost high quality microoptical component manufacturing. In this process, first high precision microoptical molds are fabricated using ultraprecision single point diamond machining followed by high volume production methods such as compression or injection molding. In the last two decades, there have been steady improvements in ultraprecision machine design and performance, particularly with the introduction of both slow tool and fast tool servo. Today optical molds, including freeform surfaces and microlens arrays, are routinely diamond machined to final finish without post machining polishing. For consumers, compression molding or injection molding provide efficient and high quality optics at extremely low cost. In this paper, first ultraprecision machine design and machining processes such as slow tool and fast too servo are described then both compression molding and injection molding of polymer optics are discussed. To implement precision optical manufacturing by molding, numerical modeling can be included in the future as a critical part of the manufacturing process to ensure high product quality.

Keywords： machining     slow tool servo     fast tool servo     compression molding     injection molding     microlens arrays     optical fabrication    

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Title Author Date Type Operation

Selection of digital fabrication technique in the construction industry—A multi-criteria decision-making

Journal Article

Materials-oriented integrated design and construction of structures in civil engineering—A review

Journal Article

Geometric quality evaluation of three-dimensional printable concrete using computational fluid dynamics

Journal Article

Mesoscale fabrication of a complex surface for integral impeller blades

Xibin WANG,Tianfeng ZHOU,Lijing XIE,Li JIAO,Zhibing LIU,Zhiqiang LIANG,Pei YAN

Journal Article

Design, fabrication, and characterization of hierarchical mechanical metamaterials

Journal Article

A multi-probe micro-fabrication apparatus based on the friction-induced fabrication method

Zhijiang WU, Chenfei SONG, Jian GUO, Bingjun YU, Linmao QIAN

Journal Article

Development trend of urban design in “digital age”: Pan-dimensionality and individual-ubiquity

Journal Article

Precision glass molding: Toward an optimal fabrication of optical lenses

Liangchi ZHANG,Weidong LIU

Journal Article

Platform governance in the era of AI and the digital economy

Journal Article

Revisiting digital twins: Origins, fundamentals, and practices

Journal Article

Improve the industrial digital transformation through Industrial Internet platforms

Journal Article

A chemical etching route to controllable fabrication of TiO

Weixin ZHANG, Jie XING, Zeheng YANG, Mei KONG, Hongxu YAO

Journal Article

Solid-state-reaction fabrication and properties of a high-doping Nd:YAG transparent laser ceramic

WU Yusong, LI Jiang, PAN Yubai, LIU Wenbin, AN Liqiong, WANG Shiwei, GUO Jingkun

Journal Article

Examining the nexus of blockchain technology and digital twins: Bibliometric evidence and research trends

Journal Article

Micro-optical fabrication by ultraprecision diamond machining and precision molding

Hui LI, Likai LI, Neil J. NAPLES, Jeffrey W. ROBLEE, Allen Y. YI

Journal Article