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SSRN 2024年

作者： Yu, Haomin Jafari, Mohammad Mujahid, Aliza Garcia, Chelsea F. Shah, Jaisheel Sinha, Riya Huang, Yuxuan Shakiba, Delaram Hong, Yuan Cheraghali, Danial Pryce, John R.S. Sandler, Jacob A. Elson, Elliot L. Sacks, Justin M. Genin, Guy M. Alisafaei, Farid NSF Science and Technology Center for Engineering Mechanobiology United States Department of Mechanical Engineering and Materials Science Washington University in St. Louis United States Department of Biomedical Engineering Washington University in St. Louis United States Department of Mechanical Engineering New Jersey Institute of Technology United States Department of Pathology Johns Hopkins University United States Department of Biochemistry and Molecular Biophysics Washington University in St. Louis School of Medicine United States Division of Plastic and Reconstructive Surgery Washington University in St. Louis School of Medicine United States

Split-thickness skin grafts are widely used to treat chronic wounds. Procedure design requires surgeons to predict how much a patch of the patient’s own skin expands when it is meshed with rows of slits and stretched over a larger wound area. Accurate prediction of graft expansion remains a challenge, with current models overestimating the actual expansion, leading to suboptimal outcomes. Inspired by the principles of mechanical metamaterials, we developed a model that distinguishes between the kinematic rearrangement of structural elements and their stretching, providing a more accurate prediction of skin graft expansion. Our model was validated against extensive data from skin graft surgeries, demonstrating vastly superior predictive capability compared to existing methods. This metamaterial-inspired approach enables informed decision-making for potentially improving healing outcomes. © 2024, The Authors. All rights reserved.

关键词： Metamaterials

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Investigation on the unsteady characteristics of flow and heat transfer in different channels of turbine blade leading edge

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International Journal of Thermal sciences 2025年 215卷

作者： Chen, Jinfu Yao, Ran Ma, Liwei Wang, Jianhua Wang, Xiaohong Gan, Ming CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Thermal Science and Energy Engineering University of Science and Technology of China Jinzhai Road No. 96 Anhui Hefei230027 China Brinellvägen 8 Stockholm11428 Sweden New Energy Technology Co. Ltd Wuxi China

In this work, the large eddy simulation (LES) method is used to study the instantaneous and time-averaged characteristics of flow and heat transfer in three internal structures i.e., swirl cooling (SC), impingement cooling (IC), double chamber cooling (DC) in the leading edge of a turbine blade at three Reynolds numbers (6.0 × 103, 9.0 × 103, 1.2 × 104). Comparison with RANS method, LES method can provide internal cooling designers with a more comprehensive understanding of flow and heat transfer. The numerical results reveal the following important conclusions: (1) At the view point of time-averaged, the tangential jet in SC and DC can significantly increase the heat transfer rate (Nu), and therefore their heat transfer rates (Nu) are higher than that of IC, but IC has the lowest friction resistance. (2) At the view point of unsteady analysis, the flow instability of SC along the flow direction increases with Re, while the flow instability of DC decreases. The heat transfer rate (Nu) instability of IC is the highest, at Re = 6.0 × 103, the Nu fluctuation amplitude of IC is increased by 34.9 % compared with SC. © 2025 Elsevier Masson SAS

关键词： Turbine components

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High-throughput Alloy and Process Design for Metal Additive Manufacturing

arXiv

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arXiv 2023年

作者： Sheikh, Sofia Vela, Brent Honarmandi, Pejman Morcos, Peter Shoukr, David Kotb, Abdelrahman Mostafa Arróyave, Raymundo Karaman, Ibrahim Elwany, Alaa Department of Materials Science and Engineering Texas A&M University College StationTX United States Department of Mechanical Engineering Texas A&M University College StationTX United States Department of Industrial and Systems Engineering Texas A&M University College StationTX United States

Designing alloys for additive manufacturing (AM) presents significant opportunities. Still, the chemical composition and processing conditions required for printability (ie., their suitability for fabrication via AM) are challenging to explore using solely experimental means. In this work, we develop a high-throughput (HTP) computational framework to guide the search for highly printable alloys and appropriate processing parameters. The framework uses material properties from state-of-the-art databases, processing parameters, and simulated melt pool profiles to predict process-induced defects, such as lack-of-fusion, keyholing, and balling. We accelerate the printability assessment using a deep learning surrogate for a thermal model, enabling a 1,000-fold acceleration in assessing the printability of a given alloy at no loss in accuracy when compared with conventional physics-based thermal models. We verify and validate the framework by constructing printability maps for the CoCrFeMnNi Cantor alloy system and comparing our predictions to an exhaustive’in-house’ database. The framework enables the systematic investigation of the printability of a wide range of alloys in the broader Co-Cr-Fe-Mn-Ni HEA system. We identified the most promising alloys that were suitable for high-temperature applications and had the narrowest solidification ranges, and that was the least susceptible to balling, hot-cracking, and the formation of macroscopic printing defects. A new metric for the global printability of an alloy is constructed and is further used for the ranking of candidate alloys. The proposed framework is expected to be integrated into ICME approaches to accelerate the discovery and optimization of novel high-performance, printable alloys. Copyright © 2023, The Authors. All rights reserved.

关键词： 3D printing

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Improving Indoor Positioning Systems with UWB and Filtering Techniques: A ComparativeAnalysis

Improving Indoor Positioning Systems with UWB and Filtering ...

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International Conference on Control, Automation and Systems ( ICCAS)

作者： First A. Rahul Ranjan Second B. Younsik Jung Shin Donggyu Third. Sanghyun Kim Chang-Hyun Kim Seungjae Lee Joongeup Kye Department of Computer Engineering and Electronics Convergence Intelligent Robot Research Institute Sun Moon University Asan Korea Department of Computer Science and Engineering Intelligent Robot Research Institute Sun Moon University Asan Korea Department of Mechanical Engineering Kyung Hee University Suwon Korea Korea Institute of Machinery & Materials Daejeon Korea Department of Mechanical Engineering Intelligent Robot Research Institute Sun Moon University Asan Korea

In today's world, indoor positioning systems(IPS) have become a fascinating research area. Accurate positioning of mobile robots in indoor environments remains challenging due to various positioning techniques and the complexities associated with dynamic environments, dense obstacles, and different material types. Indoor localization systems face challenges in reducing noise and enhancing accuracy. In this paper, an Ultra-Wideband(UWB) based localization system is under test to evaluate the efficiency of the measurement using two different methods, Low-Pass Filter(LPF) and Kalman Filter(KF), on Robot Operating System(ROS) platform. This study aims to assess and compare the effectiveness of the proposed methods in reducing noise and improving the accuracy of indoor localization systems. A set of position data was recorded in the lab environment. The proposed Filtered is applied and compared with target trajectory paths. The findings of this research contribute to the development of robust and reliable indoor localization systems crucial for various applications, including mobile robotics, automation, and human-computer interaction.

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Unified Interpretations of Two Kinds of Needle-Shaped Precipitates Using Transmission Electron Microscopy and Small-Angle Neutron Scattering in Aged Al-Mg2si(-Cu) Alloys

SSRN

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SSRN 2023年

作者： Kaharudin, Amalina Aina Ohnuma, Masato Lee, Seungwon Tsuchiya, Taiki Asada, Yuuki Ikeda, Ken-Ichi Ohishi, Kazuki Suzuki, Jun-Ichi Matsuda, Kenji Homma, Tomoyuki Department of Science of Technology Innovation Nagaoka University of Technology Nagaoka940-2188 Japan Division of Applied Quantum Science and Engineering Faculty of Engineering Hokkaido University Sapporo060-8628 Japan Graduate School of Science and Engineering for Research University of Toyama Toyama930-8555 Japan Department of Mechanical Engineering Nagaoka University of Technology Nagaoka940-2188 Japan Division of Materials Science and Engineering Faculty of Engineering Hokkaido University Sapporo060-8628 Japan Tokai319-1106 Japan

This study investigates nanostructural properties of pseudo-binary Al-1.0Mg2Si (mass%) alloys with and without 0.5Cu using transmission electron microscopy (TEM) and small-angle neutron scattering (SANS). The TEM results show that both alloys exhibit extra electron diffractions related to MgSiMg second clusters at peak-aged. High resolution TEM images revealed that the second cluster exists as a needle-shaped precipitate. Close observations of the second cluster had never been reported before. The second cluster is referred to as R phase, to distinguish between early clusters and precipitates. The SANS results also confirmed the presence of two different needle-shaped precipitates. The R phase is identified as the one with a small aspect ratio, whereas the strengthening phase β'' is the large one. The precipitation behavior of the R phase is different in the Cu-free and Cu-containing alloys, but we can conclude that the R phase contributes to hardness in the early stage of aging, whereas the β'' phase is more prominent near peak age. The R phase structure is partially present in the longitudinal direction of the random-type precipitate that is commonly observed in Al-Mg-Si alloys. © 2023, The Authors. All rights reserved.

关键词： Neutron scattering

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On the Precipitation and Transformation Kinetics of Precipitation-Hardening Steel X5CrNiCuNb16‑4 in a Wide Range of Heating and Cooling Rates

SSRN

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SSRN 2024年

作者： Milkereit, Benjamin Rowolt, Christian Chatterjee, Dipanwita Holmestad, Randi Bjørge, Ruben Villa, Matteo Niessen, Frank Stark, Andreas De Geuser, Frédéric Kessler, Olaf CALOR Department LL&M University of Rostock Germany Faculty of Mechanical Engineering and Marine Technology Germany University of Rostock Germany Department of Physics Norwegian University of Science and Technology NTNU Høgskoleringen 5 Trondheim7491 Norway Department of Materials and Nanotechnology SINTEF Industry P.O. Box 4760 Torgarden TrondheimNO-7465 Norway Department of Mechanical Engineering Materials and Surface Engineering Technical University of Denmark DTU Copenhagen Denmark Institute of Materials Physics Helmholtz-Zentrum Hereon Geesthacht Germany Univ. Grenoble Alpes Grenoble INP SIMaP Grenoble38000 France

In this work, the transformation and dissolution/precipitation behaviour of the soft martensitic, precipitation-hardening steel X5CrNiCuNb16-4 (often referred to as 17-4 PH or AISI 630) has been investigated by various analytical in situ techniques. First, austenite formation during the heating stage of a solution treatment (or austenitization) is examined. Subsequently, a major part of this work evaluates precipitation during cooling from the solution treatment (i.e., the quench-induced precipitation of Cu-rich particles). The following analytical in situ techniques were utilised: synchrotron high-energy X-ray diffraction, synchrotron small-angle X-ray scattering, differential scanning calorimetry, and dilatometry. These were complemented by ex situ high-angle annular dark-field scanning transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy on as-quenched samples after various cooling rates. The continuous heating transformation and continuous cooling transformation diagrams have been updated. Contrary to previous reports, X5CrNiCuNb16-4 is rather quench sensitive and the final properties after ageing degrade if cooling is done slower than a certain critical cooling rate. Quench-induced Cu-rich precipitation happens in two reactions: a larger, nearly pure Cu face-centred cubic phase forms at higher temperatures, while at medium temperatures, spherical Cu-rich nanoparticles form, which are found to be body-centred cubic at room temperature. The dimensions of the quench-induced particles range from several µm after cooling at 0.0001 K/s down to just a few nm after cooling at 1 K/s. The maximum age hardening potential of X5CrNiCuNb16-4 can be exploited if a fully supersaturated solid solution is reached at cooling rates above the critical cooling rate of about 10 K/s. © 2024, The Authors. All rights reserved.

关键词： Precipitation (chemical)

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Constructing High Efficient Carrier Channels in Double Ternary Compounds Mosse/Cdsse Heterojunction for Photoelectrochemistry and Electrocatalytic Hydrogen Production

SSRN

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SSRN 2024年

作者： Zhang, Yujia Yang, Han Zhang, Jun Lin, Bao Xu, Jing Yang, Shuai New Energy Materials Research Center College of Materials and Environmental Engineering Hangzhou Dianzi University Hangzhou310018 China School of Physics and Electronic Engineering Hubei University of Arts and Science Xiangyang441053 China Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and Science Xiangyang441053 China Key Laboratory of Novel Materials for Sensor of Zhejiang Province Hangzhou Dianzi University Hangzhou310018 China Department of Mechanical Engineering Hangzhou Dianzi University Hangzhou310018 China Hangzhou Dianzi University China

Here is a demonstration of constructing MoSSe/CdSSe heterojunction catalyst from bimetallic selenium sulfides. CdSSe has a high conduction band position of -0.65 eV, resulting in a strong reduction potential of photogenerated electrons. However, the high resistance of CdSSe affects the transport of charge carriers. In addition, experiments have confirmed that the presence of S and Se in MoSSe and CdSSe enhances their chemical activity and facilitates bonding. A better connection can be formed between MoSSe and CdSSe, resulting in high carrier transport efficiency. In the X-ray photoelectron spectroscopy results, the Mo and Se signals showed a large shift nearly 1 eV which confirms the strong binding between MoSSe and CdSSe. In the photoelectrochemical tests, the MoSSe/CdSSe heterojunction demonstrated a photocurrent density of 3.097 mA/cm2 at 0V (RHE) which is 2.7 and 2.9 times that of MoSSe (1.227 mA/cm2) and CdSSe (1.127 mA/cm2) respectively with a low resistance of 161 Ω. Moreover, the MoSSe/CdSSe also has good electrocatalytic hydrogen evolution performance with an overvoltage of 180 mV and Tafel slope of 69 mV/dec. Fluorescence and photocurrent response tests confirmed its higher carrier separation efficiency. This work demonstrates the application of ternary metal selenium sulfide heterojunctions in catalytic energy materials. © 2024, The Authors. All rights reserved.

关键词： Sulfur compounds

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First-principles molten salt phase diagrams through thermodynamic integration

arXiv

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arXiv 2023年

作者： Shah, Tanooj Fazel, Kamron Lian, Jie Huang, Liping Shi, Yunfeng Sundararaman, Ravishankar Department of Materials Science and Engineering Rensselaer Polytechnic Institute TroyNY12180 United States Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute TroyNY12180 United States Department of Mechanical Aerospace and Nuclear Engineering Rensselaer Polytechnic Institute TroyNY12180 United States

Precise prediction of phase diagrams in molecular dynamics (MD) simulations is challenging due to the simultaneous need for long time and large length scales and accurate interatomic potentials. We show that thermodynamic integration (TI) from low-cost force fields to neural network potentials (NNPs) trained using density-functional theory (DFT) enables rapid first-principles prediction of the solid-liquid phase boundary in the model salt NaCl. We use this technique to compare the accuracy of several DFT exchange-correlation functionals for predicting the NaCl phase boundary, and find that the inclusion of dispersion interactions is critical to obtain good agreement with experiment. Importantly, our approach introduces a method to predict solid-liquid phase boundaries for any material at an ab-initio level of accuracy, with the majority of the computational cost at the level of classical potentials. Copyright © 2023, The Authors. All rights reserved.

关键词： Sodium chloride

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Cu3N thin film synthesized by selective in situ substrate heating during high power impulse magnetron sputtering for augmenting UV photodetection

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Sensors and Actuators A: Physical 2023年第1期350卷

作者： Sakalley, Shikha Saravanan, Adhimoorthy Cheng, Wei-Chun Chen, Sheng-Chi Sun, Hui Liao, Ming-Han Huang, Bohr-Ran Department of Mechanical Engineering National Taiwan University of Science and Technology Taipei106 Taiwan Department of Materials Engineering and Center for Plasma and Thin Film Technologies Ming Chi University of Technology New Taipei City243 Taiwan Graduate Institute of Electro-Optical Engineering and Department of Electronic and Computer Engineering National Taiwan University of Science and Technology Taipei106 Taiwan College of Engineering and Center for Green Technology Chang Gung University Taoyuan333 Taiwan School of Space Science and Physics Shandong University Weihai264209 China Department of Mechanical Engineering National Taiwan University Taipei106 Taiwan

Copper Nitride (Cu3N) thin film has significant optoelectronic properties useful in various applications such as photodetection, lithium-ion batteries etc. In this study, we extend our work on the use of High Power Impulse Magnetron Sputtering (HiPIMS) for the deposition of Cu3N films at various substrate temperatures for the application of high-performance UV photodetectors. The resultant sample exhibits perfect stoichiometry of Cu3N with the orientation of the Cu3N (100) crystal plane. The effect of substrate temperature on the photodetection performance has great significance and is analyzed and discussed in detail. The high crystallinity of resultant Cu3N is due to the reduction in the defects, which increases the crystallite size. The newly designed UV photodetector presents remarkable properties. At 150 °C substrate temperature, the high photocurrent and photosensitivity of 34.3 × 10−8 A and 6035%, respectively, are achieved. An ultrafast photo response and recovery of 6.5 s and 12 s, respectively, were observed during the on/off switching of UV light. The device outperforms due to its high stability for around 30 days. High crystallinity of resultant Cu3N attributes to the reduction in the defects, which increases the crystallite size. Improvement in optoelectronic properties led to the formation of a single layer Cu3N thin films for fabricating UV photodetectors. Based on the outcomes, Cu3N thin films have great potential to be applied as high-performance UV photodetectors in advanced devices. © 2023 Elsevier B.V.

关键词： Magnetron sputtering

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Biocompatibility of anodized low-cost Ti-4.7Mo-4.5Fe alloy

Biocompatibility of anodized low-cost Ti-4.7Mo-4.5Fe alloy

引用

International Conference on Processing and Manufacturing of Advanced materials Processing, Fabrication, Properties, Applications, THERMEC 2021

作者： Abdelrhman, Yasser Kobayashi, Sengo Okano, Satoshi Okamoto, Takeaki Gepreel, Mohamed A.-H. Department of Materials Science and Engineering Egypt-Japan University of Science and Technology New Borg El-Arab City Alexandria21934 Egypt Mechanical Engineering Department Faculty of Engineering Assiut University Assiut71516 Egypt Department of Materials Science and Biotechnology Ehime University 3 Bunkyo-cho Matsuyama790-8577 Japan Faculty of Education Ehime University 3 Bunkyo-cho Matsuyama790-8577 Japan

ISBN: (纸本)9783035736304

Self-organized TiO2 nanotubes were generated on the surface of the designed alloy Ti- 4.7Mo-4.5Fe (TMF55) by electrochemical anodization process to investigate the effect of nanostructured on the biocompatibility. The biocompatibility of the designed alloys showed very promising results compared to those of Ti-6Al-4V ELI alloy, especially for the untreated and nanostructured surfaces of the specimens with diameter size less than 35 nm. By increasing the diameter of nanotube, the biocompatibility is decreased. The most convenient compatible alloy was in favor of TMF8 alloy, making this V-free low-cost alloy is a promising candidate for replacing the commercial Ti-6Al-4V ELI alloy in biomedical applications. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Titanium alloys

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