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Microstructure and mechanical properties of nickel-based superalloy fabricated by laser powder-bed fusion using recycled powders

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International Journal of Minerals,Metallurgy and materials 2021年第2期28卷 266-278页

作者： de-cheng Kong Chao-fang dong Xiao-qing Ni Liang Zhang Rui-xue Li Xing He Cheng Man Xiao-gang Li Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Shanghai Engineering Research Center of 3D Printing Materials Shanghai Research Institute of MaterialsShanghai 200437China School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China

Evaluating the recyclability of powders in additive manufacturing has been a long-term *** this study,the microstructure and mechanical properties of a nickel-based superalloy fabricated by laser powder-bed fusion(LPBF)using recycled powders were ***-melted powder surfaces,satellite particles,and deformed powders were found in the recycled powders,combined with a high-oxygencontent surface *** increasing oxygen content led to the formation of high-density oxide inclusions;moreover,printing-induced cracks widely occurred and mainly formed along the grain boundaries in the as-built LPBF nickel-based superalloys fabricated using recycled powders.A little change in the Si or Mn content did not increase the hot cracking susceptibility(HCS)of the printed *** changing aspect ratio and the surface damage of the recycled powders might contribute to increasing the crack ***,the configuration of cracks in the as-built parts led to anisotropic mechanical properties,mainly resulting in extremely low ductility vertical to the building direction,and the cracks mainly propagated along the cellular boundary owing to the existence of a brittle precipitation phase.

关键词： laser powder-bed fusion recycled powder cracking anisotropy nickel-based superalloy

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Studying the influence of the photopolymer material properties to the creation of MLAs with using digital light processing (dLP) stereolithography printing (SLA)

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Sensors and Actuators A: Physical 2023年 360卷

作者： Chen, Pin-Chuan Hsieh, Chih-Yu Department of Mechanical Engineering National Taiwan University of Science and Technology Taiwan High Speed 3D Printing Research Center National Taiwan University of Science and Technology Taiwan

Microlens arrays (MLAs) is an important optical component used in various emerging fields, and applying grayscale digital masks and defocusing method to digital light processing (dLP) stereolithography (SLA) 3d printing for rapid fabrication of MLAs within 1 s was successfully demonstrated previously. To further improve the performance of printed MLAs competitive to the commercial MLAs, a new photopolymer (TP01K9) was used herein and multiple experiments were conducted to characterize the printed MLAs. Experiment results clearly show that: (1) the material properties of photopolymer, including forming characteristic, mechanical strength, and Abbe number, were critical and deeply influenced the performance of MLAs, (2) the image resolution was improved to 58.7 lp/mm, which is very competitive or superior than the commercial plastic MLAs with resolution of 48.8 lp/mm, (3) defocus method significantly reduced the average surface roughness (Sa) of the printed MLAs to 80 nm, which is critical to the image resolution, (4) with photopolymer of TP01K9, the MLA with a 10 × 10 array, lens pitch of 120 µm, and lens diameter of 60 µm was successfully manufactured. © 2023 Elsevier B.V.

关键词： Microlenses

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Adaptive Layer Thickness and Lifting Force Control for Bottom Lighting LCd Based Additive Manufacturing

Adaptive Layer Thickness and Lifting Force Control for Botto...

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Annual Conference of Industrial Electronics Society

作者： Hong-Yi Xue Ming-Jong Tsai Han-Wei Wu Graduate Institute of Automation and Control National Taiwan University of Science and Technology High Speed 3D Printing Research Center National Taiwan University of Science and Technology Taipei Taiwan

To improve the printing efficiency of LCd Based Additive Manufacturing System, this study integrates adaptive layer thicknesses processing technique and adaptive lifting speed and position control during the printing process. Firstly, this study prints several samples with different thickness to find out the required curing time of the used resin. Secondly, some square samples with different slicing area are printed under different lifting speed and tensile stress force are recorded for analysis. The relationship between tension and lifting speed for different cross-sectional area can be modeled for the used material. Therefore, the lifting speed for different tensile forces and cross-sectional areas can be obtained by different shapes of objects. A safety factor is employed to obtained the maximum lifting force to improve the success rate of printing and save the printing time. A potentiometer is also equipped on the vertical axis for real-time monitoring the position and cooperates with a load cell to determine whether the printed object is separated from the bottom. In this study, a snowman-shaped object with different slopes is printed to demonstrate the benefit of adaptive layer thickness and the adaptive tension value with different lifting speed. The printing time can be reduced over 40% through the proposed method in which the layer thickness and lifting speed/position are adaptively controlled layer by layer.

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research on Anti-Swing Strategies for Bridge Cranes

Research on Anti-Swing Strategies for Bridge Cranes

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2024 China Automation Congress, CAC 2024

作者： Wang, Shiqi Hou, Enguang Zheng, Haoyuan Jiang, Yuyi Shen, Zhen Xiong, Gang The College of Rail Transit Shandong Jiaotong University Jinan250399 China Beijing Engineering Research Center of Intelligent Systems and Technology Institute of Automation Chinese Academy of Sciences Beijing100190 China Intelligent Manufacturing Center Qingdao Academy of Intelligent Industries Qingdao266144 China Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Chinese Academy of Sciences Dongguan523808 China State Key Laboratory of Multimodal Artifcial Intelligence Systems Institute of Automation Chinese Academy of Sciences Beijing100190 China

ISBN: (纸本)9798350368604

A study is conducted on the LH5T-13.5M electric crane, focusing on the swing characteristics of the load during steel coil lifting operations and the displacement issue of the crane. Initially, the system model is formulated using the Lagrange dynamic equations, translating the practical challenges into a solvable mathematical framework and deriving the transfer function of interest. Subsequently, the development of three control strategies is elucidated, formulated on the basis of the established model: a conventional PId control system, a fuzzy PId control system, and an adaptive proportional factor fuzzy neural PId controller. These systems are simulated and validated using Simulink. A comparative experimental setup is employed to evaluate performance. The results show that when the step input signal is 1, the maximum absolute load swing Angle of the traditional PId, fuzzy PId and adaptive scale factor fuzzy neural PId controller are 0.185°, 0.054° and 0.049° respectively for the working condition 1 experiment. The percentage overshoot corresponding to the wheelbarrow is 37.1%, 40.0%, and 30.5%, respectively. The findings indicate that the introduced fuzzy neural PId controller, equipped with an adaptive scaling factor, exhibits superior stability and effectiveness in maintaining the crane’s operation within the optimal range of parameters. © 2024 IEEE.

关键词： Bridge cranes

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3d printing Bioink Preparation and Application in Cartilage Tissue Reconstruction in Vitro

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Journal of Shanghai Jiaotong university(Science) 2021年第3期26卷 267-271页

作者： SUN Binbin HAN Yu JIANG Wenbo dAI Kerong Department of Orthopaedic Surgery Shanghai Key Laboratory of Orthopaedic ImplantsClinical and Translational Research Center for 3D Printing TechnologyShanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai200011China

Three-dimensional(3d)bioprinting technology has great potential for application in the treatment of cartilage ***,the preparation of biocompatible and stable bioinks is still a major *** this study,decellularized extracellular matrix(dECM)of soft tissue was used as the basic material to prepare the *** results showed that this novel dECM-derived bioink had good printing performance and comprised a large number of fine *** characterization revealed that the bioink was compatible with the growth of chondrocytes and that the nanofibrous structure greatly promoted cell *** and immunohistochemical analyses showed that the in vitro printed cartilage displayed the presence of characteristic cartilage ***,a new preparation method for dECM-derived bioink with potential application in generation of cartilage was developed in this study.

关键词： bioink cartilage 3d printing tissue engineering biomaterials

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Formability of printing Ink for Melt Electrowriting

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Journal of Shanghai Jiaotong university(Science) 2021年第3期26卷 411-415页

作者： HAN Yu SUN Binbin JIANG Wenbo dAI Kerong Department of Orthopaedic Surgery Shanghai Key Laboratory of Orthopaedic ImplantsClinical and Translational Research Center for 3D Printing TechnologyShanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai200011China

3d printing,also called additive manufacturing,is being used increasingly in tissue ***,the printing accuracy remains limited,making it difficult to prepare a tissue engineering scaffold with high precision and high *** electrowriting(MEW)technology is based on extrusion printing,in which an extruded material is pulled by the action of an electric field,thereby reducing the fiber diameter and improving the printing ***,MEW technology imposes high requirements on the material properties,and therefore,few printing materials are currently available for use in this *** present study investigates the characteristics and molding conditions of polycaprolactone,a commonly used printing material,as well as other materials such as poly(lactic-co-glycolic acid),poly(ethylene glycol)diacrylate/polyethylene oxide,gelatin methacrylate,and hyaluronic acid methacrylate for MEW applications,and develops new and suitable inks for MEW that will provide more and better choices for constructing a bioactive scaffold in future tissue engineering *** suggest that a printing ink should have low electrical conductivity,suitable viscosity,and high curing speed for realizing successful printing.

关键词： 3d printing melt electrowriting(MEW) conductivity viscosity Taylor cone

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Real-time In-situ defect detection in 3d printing of Continuous Fiber-Reinforced Composites 4

Real-time In-situ Defect Detection in 3D Printing of Continu...

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4th IEEE International Conference on digital Twins and Parallel Intelligence, dTPI 2024

作者： Yue, Zhijian Shen, Zhen dong, Xiangyang Fang, Qihang Wang, Weixing dong, Xisong Xiong, Gang Wang, Fei-Yue University of Chinese Academy of Sciences School of Artificial Intelligence Beijing100049 China Chinese Academy of Sciences State Key Laboratory of Multimodal Artificial Intelligence Systems Beijing Engineering Research Center of Intelligent Systems and Technology Institute of Automation Beijing100190 China Qingdao Academy of Intelligent Industries Intelligent Manufacturing Center Qingdao266109 China Chinese Academy of Sciences Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Dongguan523808 China Chinese Academy of Sciences State Key Laboratory for Management and Control for Complex Systems Institute of Automation Beijing100190 China

ISBN: (纸本)9798350349252

With the development of continuous fiber-reinforced composites (CFRCs) 3d printing technology, timely, efficient and accurate detection of fiber path defects is essential for ensuring product quality and performance. However, challenges still need to be addressed in this field, such as inadequate training data coverage and the complexity of fiber path structures. These factors hinder the capability of traditional methods to accurately assess the status of printed products. Therefore, developing accurate and robust fiber path defect detection techniques is crucial for CFRCs 3d printing technology. In this paper, we propose a precise detection method for fiber path defects in CFRCs 3d printing using the YOLOv7 object detection model combined with a Squeeze-and-Excitation (SE) attention mechanism. By introducing the SE attention mechanism, we enhance the perception capability of the YOLOv7 model for crucial features, thereby improving the accuracy of fiber path defect detection. The experimental results show that the YOLOv7 model, when augmented with an attention mechanism, achieves an average accuracy of 93.9% in identifying fiber path defects during the printing process. Compared to models without this attention mechanism, the results show that there is 10.7% increase, with a notably enhanced learning capacity during the training phase, which substantiates the efficacy and practicality of the proposed approach. © 2024 IEEE.

关键词： Fiber reinforced plastics

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Bending Performance of Ultra High-Performance Concrete Reinforced Concrete Composite Beams by 3d printing

SSRN

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SSRN 2023年

作者： Guan, Jingyuan Ye, Kehan Wang, Li Li, Zhijian Ma, Guowei Bai, Gang School of Civil and Transportation Engineering Hebei University of Technology 5340 Xiping Road Beichen District Tianjin300401 China Engineering Research Center for Construction 3D Printing of Hebei Tianjin300401 China

The integrated optimization of materials, processes, and structural performance is the development trend for 3d concrete printing. Composite beam reinforced by 3d printed ultra high-performance concrete (3dP-UHPC) was proposed, i.e., 3d printed UHPC was applied as the strengthen skeleton for the entire composite beam. In this study, three optimized forms of 3dP-UHPC skeleton were derived through topology optimization design. Four-point bending tests were conducted on 3dP-UHPC skeleton composite reinforced concrete beams (CRC), rebars locally reinforced CRC beams (R-CRC), and rebars locally reinforced 3d printed concrete beams (R-PC). Additionally, conventionally reinforced concrete beam (RC) was produced for comparison. The results showed that the of CRC and R-PC perform 1/4 and 1/2 flexural capacity of RC, respectively. Their limited flexural capacity led to sudden failures, failing to meet structural load requirements. In contrast, R-CRC exhibited superior stiffness and strength, demonstrating exceptional bending performance for 3d printed concrete beams without the reinforcement of reinforcement cages. This approach significantly enhances the structural load capacity of 3d printed structures while preserving flexibility and reducing reliance on steel cages. The study provides valuable experimental data and methodological guidance for the application of 3d printed concrete structures in structural load-bearing engineering. © 2023, The Authors. All rights reserved.

关键词： 3d printing

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Parallel Systems Framework: A Safe and Efficient Testbed for Unmanned Ships 4

Parallel Systems Framework: A Safe and Efficient Testbed for...

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4th IEEE International Conference on digital Twins and Parallel Intelligence, dTPI 2024

作者： Fu, Long Shen, Zhen dong, Xisong Han, Yunjun Yang, Shuguang Xiong, Gang Wang, Fei-Yue University of Chinese Academy of Sciences School of Artificial Intelligence Beijing100049 China Chinese Academy of Sciences State Key Laboratory of Multimodal Artificial Intelligence Systems Beijing Engineering Research Center of Intelligent Systems and Technology Institute of Automation Beijing100190 China Chinese Academy of Sciences Guangdong Engineering Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Dongguan523808 China Shandong Jiaotong University Schoool of Rail Transportation Jinan250399 China Chinese Academy of Sciences State Key Laboratory for Management and Control for Complex Systems Institute of Automation Beijing100190 China

ISBN: (纸本)9798350349252

In this study, unmanned ships test platform based on the parallel systems framework is proposed to improve the test efficiency and accuracy of unmanned ships in complex ocean environment. The parallel intelligence theory and ACP approach, the efficient interaction between virtual and real environment is achieved, which provides more comprehensive and accurate data for unmanned ships testing. Future research will further expand the scope of virtual environment simulation and improve systems accuracy and response speed to a wider range of unmanned ships test requirements. © 2024 IEEE.

关键词： Virtual environments

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design and Application of 3d printing Based Personalised Pelvic Prostheses

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Journal of Shanghai Jiaotong university(Science) 2021年第3期26卷 361-367页

作者： WU Junxiang LUO dinghao XIE Kai WANG Lei HAO Yongqiang Department of Orthopaedic Surgery Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai200011China Medical 3D Printing Innovation Research Center for Technology Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai200011China

In this paper,we describe the design and surgical process of personalised pelvic prostheses fixation through 3d printing according to different Enneking pelvic tumour zones:the ilium(Zone I),acetabulum(Zone II),and pubis and ischium(Zone III).A 3d model of the pelvis was reconstructed using imaging data,and the parameters on the planes of the acetabulum and pelvic incisal margin were *** main body of the pelvic prosthesis was constructed,a porous structure was designed on the bone-prosthesis interface,and the movement paths,lengths,and diameters of screws were *** combining the pathological model and osteotomy guide,limb salvage reconstruction was performed in patients with pelvic *** and postoperative data were compared to verify the prosthesis *** investigation revealed that the long-term survival of pelvic reconstruction prostheses depends on accurate matching with the bone defect area,good initial stability,and a porous structure to allow bone ingrowth.

关键词： pelvic prosthesis hemipelvic reconstruction personalised treatment 3d printing design solution

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