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Laser powder bed fusion of difficult-to-print γ′ Ni-based superalloys: A review of processing approaches, properties, and remaining challenges

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Additive Manufacturing 2025年 106卷

作者： Enrique, Pablo D. Minasyan, Tatevik Toyserkani, Ehsan Multi-Scale Additive Manufacturing Lab Department of Mechanical and Mechatronics Engineering University of Waterloo 200 University Avenue West WaterlooONN2L 3G1 Canada

Metal additive manufacturing (AM) promises a revolution with the potential to fabricate more complex, lighter, and higher performance components while simplifying supply chains and reducing material waste. However, many of the superalloys that are critical to applications requiring superior high-temperature properties are also challenging to process using fusion-based AM. The number of publications on this topic has grown significantly in the past five years, reflecting a growing interest within industry and academia. This article reviews and discusses the challenges associated with powder bed fusion - laser beam (PBF-LB) of γ′ Ni-based superalloys and recent approaches that have enabled their processing. This includes process parameter optimization, alloy modification, and heat treatment, all of which have been shown to produce material with reduced defect density. Additionally, the properties of γ′ Ni-based superalloys made with PBF-LB and conventional (cast and wrought) processes are compared and the reasons for the observed differences are discussed. Current and future research trends are provided based on the current outstanding challenges and prevailing theories in the literature, as well as an outlook on the adoption of PBF-LB γ′ Ni-based superalloys in industry. © 2025 The Authors

关键词： Superalloys

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Corrigendum to "Sacrificial 3D printing of shrinkable silicone elastomers for enhanced feature resolution in flexible tissue scaffolds" [Acta Biomaterialia, 2020, 117, 261-272] (Acta Biomaterialia (2020) 117 (261–272), (S1742706120305754), (10.1016/***.2020.10.001))

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Acta Biomaterialia 2025年 198卷 573-574页

作者： Davoodi, Elham Montazerian, Hossein Khademhosseini, Ali Toyserkani, Ehsan Multi-Scale Additive Manufacturing Lab Mechanical and Mechatronics Engineering Department University of Waterloo 200 University Avenue West WaterlooON N2L 3G1 Canada Department of Bioengineering University of California Los Angeles 410 Westwood Plaza Los AngelesCA90095 United States University of California Los Angeles 570 Westwood Plaza Los AngelesCA90095 United States Terasaki Institute for Biomedical Innovation Los AngelesCA90024 United States

The authors regret to report that an error was identified in Fig. 7a where the live/dead image of PDMS and control on day 5 were taken from incorrect wells. The corrected panels are included in the updated Fig. 7 provided here along with its original caption. We note that the same samples were re-stained over time in this experiment. Thus, to avoid potential confusion, we have placed different repeats of samples for control on day 3 and SR on day 3. These changes did not affect the data interpretation nor the conclusions of the paper. The authors apologize for the inconvenience this error may have caused. © 2025 Acta Materialia Inc.

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Thick 3D-Printed Hierarchical Li4Ti5O12@MOF anode and Grid-Lined micropores for High-Performance Lithium-Ion batteries

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Journal of Colloid and Interface Science 2025年 696卷 137883页

作者： Mwizerwa, Jean Pierre Li, Jie Nsengiyumva, Walter Li, Chen Xu, Kun Rasaki, Sefiu Abolaji Liu, Changyong School of Materials Science and Engineering Fujian University of Technology Fuzhou350118 China Additive Manufacturing Institute College of Mechatronics & Control Engineering Shenzhen University Shenzhen518060 China Fujian Provincial Key Laboratory of Terahertz Functional Devices and Intelligent Sensing School of Mechanical Engineering and Automation Fuzhou University Fuzhou China The Institute of Precision Instrument and Intelligent Measurement & Control Fuzhou University Fuzhou China Institute: Department of Chemical and Petroleum Engineering University of Calgary AlbertaT2N 1N4 Canada

Li4Ti5O12 (LTO) anode is a promising candidate for high-energy–density lithium-ion batteries (LIBs), but achieving high mass loading, a porous structure, and efficient ion transport remains a challenge. Herein, we present a high-mass-loading, hierarchically porous LTO anode with a conductive network and grid-lined micropores, embedded with a metal–organic framework (MOF) as both an electrode additive and surface protective layer. This novel structure is fabricated using extrusion-based three-dimensional (3D) printing technology. The self-standing framework provides mechanical stability and high conductivity, enabling a thick (316 μm) 3D-printed LTO@UiO-66-MOF (3D-LTO@U) anode with a mass loading of 11 mg/cm2. It delivers a high-rate capability of 161 mAh/g at 5C, an areal specific capacity of 5.37 mAh/cm2, and 78.9 % areal capacity retention after 150 cycles. Additionally, it achieves a high specific energy density of 382.35 Wh/kg. The UiO-66 MOF provides strong binding affinity, suppressing side reactions and enhancing Li-ion/electron transport within the 3D-printed interconnected channels. This improves active material utilization during charge and discharge. Furthermore, a 3D-printed full cell integrating a grid-lined 3D-LTO@U anode and a 3D-printed LiFePO4 cathode exhibits enhanced electrochemical performance. This work demonstrates an effective strategy for designing thick, high-mass-loading, and porous conductive network anodes for advanced LIBs. © 2025 Elsevier Inc.

关键词： Lithium-ion batteries

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A novel digital twin-enabled three-stage feature imputation framework for non-contact intelligent fault diagnosis

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Advanced engineering Informatics 2025年 66卷

作者： Yu, Yue Karimi, Hamid Reza Gelman, Len Liu, Xin Department of Mechanical Engineering Politecnico di Milano via La Masa 1 Milan20156 Italy School of Computing and Engineering University of Huddersfield Queensgate HuddersfieldHD1 3DH United Kingdom Department of Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao06600 China

Vibration-based fault diagnosis methods are widely used in industrial applications due to their high accuracy and reliability. However, their implementation is often hindered by challenges such as confined spaces, harsh environmental conditions, and cost limitations. Moreover, traditional deep learning-based approaches frequently overlook the critical relationship between virtual and physical signals, which can limit their diagnostic performance. To overcome these challenges, this study introduces a novel digital twin-driven feature imputation framework (NIFD-Net) for non-contact intelligent fault diagnosis. The NIFD-Net framework consists of three key stages: (1) codebook generation, where features from simulated vibration signals (SVS) and non-contact signals (NCS) are compressed and regularized using diagnosis-oriented codebooks;(2) mapping construction, where a Transformer is employed to establish the relationship between SVS and NCS in a compressed feature space;and (3) diagnostic enhancement, where imputed SVS features are integrated with original NCS features to improve diagnostic performance. First, digital twin (DT)-enabled models, developed using structural parameters and fault characteristics, dynamically simulate the operating conditions of rolling bearings to generate high-quality SVS samples. The relationship between the two feature spaces of SVS and NCS is then learned by a transformer to impute the SVS features. Finally, the imputed SVS features are integrated with the original NCS features to enhance fault diagnostic performance. Extensive experiments on three case studies demonstrate that NIFD-Net outperforms state-of-the-art methods, achieving an average accuracy of 98.34% across diverse tasks. Notably, the framework exhibits strong noise robustness, maintaining high diagnostic performance even under adverse conditions (e.g., SNR = -10 dB). The results highlight the effectiveness of integrating simulated and real signals for non-contact fault diag

关键词： Vibrations (mechanical)

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Dynamic Modeling of a Non-Uniform Flexible Tail for a Robotic Fish

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Journal of Bionic engineering 2013年第2期10卷 201-209页

作者： Phi Luan Nguyen Van Phu Do Byung Ryong Lee Intelligent Control and Mechatronics Lab School of Mechanical Engineering University of Ulsan Ulsan 680-749 Korea School of Mechanical Engineering University of Ulsan Ulsan 680-749 Korea

In this paper, a non-uniform flexible tail of a fish robot was presented and the dynamic model was developed. In this model, the non-uniform flexible tail was modeled by a rotary slender beam. The hydrodynamics forces, including the reactive force and resistive force, were analyzed in order to derive the governing equation. This equation is a fourth-order in space and second-order in time Partial Differential Equation （PDE） of the lateral movement function. The coefficients of this PDE were not constants because of the non-uniform beams, so they were approximated by exponential functions in order to obtain an analytical solution. This solution describes the lateral movement of the flexible tail as a function of material, geometrical and actuator properties. Experiments were then carried out and compared to simulations. It was proved that the proposed model is suitable for predicting the real behavior of fish robots.

关键词： fish robot flexible tail dynamic modeling kinematic lateral movement

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Feasibility of 3D-printed polymeric covers for electrode wires in electropolishing of additively manufactured parts with internal channels

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Additive Manufacturing 2025年 107卷

作者： Sun, Manyou Mohammadnejad, Ali Toyserkani, Ehsan Multi-Scale Additive Manufacturing (MSAM) Lab Department of Mechanical and Mechatronics Engineering University of Waterloo Waterloo N2L 3G1 ON Canada

This work discloses the preliminary results of a feasibility study of a novel setup and procedure for electropolishing internal channels of additively manufactured components. A specially designed and printed polymeric cover was assembled with a flexible stainless steel 316 wire to facilitate electropolishing of internal channels with various curvatures. A numerical simulation was conducted for optimization of wire cover designs, and the performance of three designs were analyzed and compared. Following that, experimental studies were conducted to assess the feasibility of the process. The presence of curvatures was found to influence the formation and removal of conductive solid reaction products, thus affecting the electropolishing performance accordingly. A maximum surface roughness Sa reduction from 10.86 ± 0.50 μm to 1.44 ± 0.46 μm was obtained for straight channels after electropolishing for 20 min, while less efficient surface smoothening performance was observed on curved channels. While challenges need to be solved for improving the electropolishing performance and reducing the limit of the channel size that can be electropolished, the methods show significant potential on electropolishing curved internal channels, which can be further used in industrial-scale applications. © 2025 The Authors

关键词： Additive manufacturing Electropolishing Internal channels Surface roughness

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H∞ control for piezo-actuated nanopositioning stages with time delays 7

H∞ control for piezo-actuated nanopositioning stages with t...

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7th International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale, IEEE 3M-NANO 2017

作者： Zhang, Zhiming Yan, Peng Control Engineering and Precision Mechatronics Lab School of Mechanical Engineering Shandong University Jinan Shandong China

ISBN: (纸本)9781538610817

Many piezo-driven nanopositioning systems employ ultra high resolution capacitive sensors for displacement feedback, which results in significant time delays induced by AD conversion. The infinite dimensionality of such systems poses new challenges for nanopositioning control, where traditional control methods can not be applied directly. In this paper, a model with time delay on a nanopositioning stage is discussed, and a parameter identification method is further deployed using experiments to determine the time delay and other model parameters. A robust H∞ control design approach is also developed by using Pade expansion to approximate the time delay block. Real time experiments with the proposed control design are conducted on a piezo-actuated nanopositioning stage, where high precision motions, robustness against model uncertainties, as well as hysteresis compensation capability, are demonstrated, which significantly outperforms traditional PI control approach. © 2017 IEEE.

关键词： Time delay

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Dynamic Modeling and Experiment of a Fish Robot with a Flexible Tail Fin

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Journal of Bionic engineering 2013年第1期10卷 39-45页

作者： Phi Luan Nguyen Van Phu Do Byung Ryong Lee ~ Intelligent Control and Mechatronics Lab School of Mechanical Engineering University of Ulsan Daehak-ro 93 Nam-gu Ulsan 680-749 South Korea School of Mechanical Engineering University of Ulsan Daehak-ro 93 Nam-gu Ulsan 680-749 South Korea

This paper presents the dynamic modeling of a flexible tail for a robotic fish. For this purpose firstly, the flexible tail was simplified as a slewing beam actuated by a driving moment. The governing equation of the flexible tail was derived by using the Euler-Bernoulli theory. In this equation, the resistive forces were estimated as a term analogous to viscous damping. Then, the modal analysis method was applied in order to derive an analytical solution of the governing equation, by which the relationship between the driving moment and the lateral movement of the flexible tail was described. Finally, simulations and experiments were carried out and the results were compared to verify the accuracy of the dynamic model. It was proved that the dynamic model of a fish robot with a flexible tail fin well explains the real behavior of robotic fish in underwater environment.

关键词： robotic fish flexible tail dynamic modeling lateral movement

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Robotic micro-assembly of scaffold/cell constructs with a shape memory alloy gripper

Robotic micro-assembly of scaffold/cell constructs with a sh...

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2002 IEEE International Conference on Robotics and Automation

作者： Zhang, Han Burdet, Etienne Hutmacher, Dietmar Werner Poo, Aun-Neow Bellouard, Yves Clavel, Reymond Sidler, Thomas Control and Mechatronics Lab Department of Mechanical Engineering National University of Singapore Singapore Singapore

This paper describes an integrated approach to design and fabricate scaffold/cell constructs for tissue engineering. With this novel approach it becomes possible to produce scaffolds with controlled distribution of living cells and growth factors, a critical condition for successful grafting. Our idea consists of building a scaffold/cell construct by robotic micro-assembly of microscopic polymer building blocks. This paper introduces the rationale and concept of this interdisciplinary project and presents some realized steps. A 3D contact FEM simulation has been carried out to study the forces involved on the scaffold elements and micro-gripper during assembly. An error analysis has been performed to evaluate the accumulated error when building a scaffold/cell construct. A dedicated monolithic shape memory alloy micro-gripper has been realized and tested, which is able to handle parts in the range of 50-100 microns.

关键词： Grippers

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Dynamic modeling of a flexible tail fin for a robotic fish

Dynamic modeling of a flexible tail fin for a robotic fish

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16th International Conference on mechatronics Technology, ICMT 2012

作者： Nguyen, Phi Luan Do, Van Phu Lee, Byung Ryong Intelligent Control and Mechatronics Lab School of Mechanical Engineering University of Ulsan Ulsan Korea Republic of School of Mechanical Engineering University of Ulsan Ulsan Korea Republic of

ISBN: (纸本)9787900769428

This paper presents the dynamic modelling of a flexible tail fin for a robotic fish. First, in this framework, the flexible tail fin was simply modelled as a rotated beam actuated by a time varying moment. Then, the governing equation of the flexible tail fin was derived by using the Euler-Bernoulli theory. The resistive forces were estimated as a term analogous to viscous damping. Next, the modal analysis method was applied to derive an analytical solution that described a relationship between the applied torque and the lateral movement of the flexible tail fin. Finally, some experiments were carried out to verify the accuracy of the dynamic model.

关键词： Modal analysis

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