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Experimental and Numerical Investigation of Effective Parameters and Optimization of Bending Angle by Response Surface Method in Laser Bending of Aluminum Sheets using Pulsed Nd: YAG Laser

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Lasers in Manufacturing and materials Processing 2024年第2期11卷 529-563页

作者： Asgharpour, Aliakbar Bakhshi-Jooybari, Mohammad Gorji, Hamid Department of Mechanical Engineering Advanced Material Forming Research Center Babol Noshirvani University of Technology Mazandaran Babol Iran

In optimization of laser bending process, the parameters are often selected without considering their significance, while the correct selection of parameters in the optimization stage is important to achieve the optimal bending angle. In this paper, a novel approach is proposed to identify and select effective parameters in the optimization of laser bending process. Using this method, due to disregarding ineffective parameters in the pre-optimization stage, the number of required tests is reduced. Eight parameters including laser power, scan velocity, beam diameter, pass number, step time, sheet length, sheet width, and sheet thickness were selected. Furthermore, the Response Surface Methodo (RSM) was used to investigate the effect of parameters and to optimize the process. The repeatability of the process along with accuracy and validation of the simulation by accurate measurement of the bending angle were examined by experiments. All experiments were performed by a laser machine with a maximum power of 400 W on AA 6061 sheets with a thickness of 2 mm. Results showed that the utilization of parameters screening, leads to a 20% reduction in time and costs of experiments in the optimization stage. In addition, among the eight parameters studied in the screening stage, five parameters were selected as effective parameters for the optimization stage. Results after parameters screening indicated that the maximum bending angle was achieved when sheet thickness (2.5 mm), beam diameter (2 mm), and scan velocity (18 mm/s) were at their low level, and that pass number (9) and laser power (450 W) were at their high level. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.

关键词： Finite element method

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Photo-responsive Carboxymethyl Chitosan/Laponite Hydrogel as a Potential Spinal Cord Injury Scaffold:Characterization and Cytocompatibility Study

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Journal of Wuhan University of technology(materials Science) 2024年第6期39卷 1628-1636页

作者： Jayanti Parajuli LI Yongtao CHANG Likun YE Liyuan HAN Yingchao YIN Yixia State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Biomedical Materials and Engineering Research Center of Hubei Province Wuhan University of TechnologyWuhan 430070China

We synthesized photo-responsive carboxymethyl chitosan(CMC-MA)via free radical polymerization and utilized nanoclay laponite(LAP)as an inorganic crosslinking agent to develop an injectable and 3D-printable CMC-MA/LAP *** determined the optimal ratio of 2.5 w/v%CMC-MA/7.5 w/v%LAP based on injection molding,compression modulus,swelling properties,rheological properties,and 3D printing properties of the hydrogel ***-vitro cytocompatibility experiments showed that both CMC-MA and CMC-MA/LAP hydrogel had no inhibitory effect on cell proliferation and can promote cell growth when cultured on the surface of the hydrogel ***,the hydrogel containing LAP particles significantly facilitated cell adhesion(>60%)compared with the hydrogel without LAP(20%).Our findings demonstrate that the CMC-MA/LAP hydrogel has great potential for tissue repair in neural tissue engineering.

关键词： neural injectable hydrogels spinal cord injury CMC-MA/LAP hydrogel cytocompatibility

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Effect of orbital symmetry on atomic ionization in near-infrared laser fields

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Chinese Physics B 2025年第1期34卷 289-292页

作者： Manqi Xu Shilin Hu Li Guo Jing Chen Research Center for Advanced Optics and Photoelectronics Department of PhysicsCollege of ScienceShantou UniversityShantou 515063China Key Laboratory of Intelligent Manufacturing Technology of MOE Shantou UniversityShantou 515063China Department of Physics Shanghai Normal UniversityShanghai 200234China Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences Department of Modern PhysicsUniversity of Science and Technology of ChinaHefei 230026China Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology Center for Advanced Material Diagnostic Technologyand College of Engineering PhysicsShenzhen Technology UniversityShenzhen 518118China

We have performed a comparative study of the photoelectron spectra adopting different initial states(2s or 2_(p0))of hydrogen atoms in a near-infrared laser pulse by using the full three-dimensional time-dependent Schr?dinger *** is demonstrated that the atomic photoelectron spectra oscillate out of step as a function of electron kinetic energies for different initial states(2s or 2_(p0)),which is well reproduced by the simulations based on strong field approximation,and the above distinct feature is ascribed to the different interferences from the partial electron wave packets detached by positive and negative electric fields for different initial states of 2s and 2_(p0).

关键词： orbital symmetry photoelectron spectra strong-field approximation

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Screen-Printed 1-m-Long Sensors for Damage Detection in Welded Engineering Structures

IEEE Journal on Flexible Electronics

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IEEE Journal on Flexible Electronics 2023年第2期2卷 153-159页

作者： Zymelka, Daniel Kobayashi, Takeshi Sensing System Research Center National Institute of Advanced Industrial Science and Technology Tsukuba305 Japan

In this study, we demonstrate 1-m-long sensors for damage detection in welded civil engineering structures. The sensors were fabricated using screen printing and were based on a hybrid construction of a conductive intermittent pattern (made of silver) with embedded sensing elements made of carbon-based resistive ink. The sensing elements were oriented in one direction corresponding to the expected maximum strain direction. Because the electrical resistance of the silver interconnects (1.88 ± 0.14Ω) was much lower than the resistance of sensing elements (2.04 ± 0.17 kΩ), the sensing properties of the sensors depend mainly on the properties of the carbon ink (gauge factor (GF) of 13.46). Thanks to such construction, the sensing direction of the sensor could be specified at the desired orientation, and the power consumption of the 1-m-long sensor could be reduced to about 15 μW. Low power consumption is especially important regarding the applications in sensing systems that are based on Internet of Things (IoT) devices. The sensors were evaluated during various laboratory tests. It was demonstrated that although the sensor is 1-m-long, it can detect even small damage (a few mm long) effectively and hence can be suitable for applications to monitor welded construction elements in real civil structures. © 2022 IEEE.

关键词： Structural health monitoring

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Investigation of operation and degradation mechanisms in ZnTeSe blue quantum-dot light-emitting diodes by identifying recombination zone

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Nano research 2024年第7期17卷 6527-6533页

作者： Oul Cho Sujin Park Hogeun Chang Jiwhan Kim Jaekwon Kim Sungwoo Kim Taehyung Kim Jeonghun Kwak Department of Electrical and Computer Engineering Inter-university Semiconductor Research Centerand Soft Foundry InstituteSeoul National UniversitySeoul 08826Republic of Korea Material Research Center Samsung Advanced Institute of TechnologySuwonGyeonggi-do 16419Republic of Korea

ZnTeSe quantum dots(QDs),recognized as promising eco-friendly blue electroluminescent emitters,remain under-explored in light-emitting diode(LED)***,to elucidate the operation and degradation mechanisms of ZnTeSe blue QD-LEDs,stacked ZnTeSe QD layers with discernable luminescence are designed by varying Te doping concentrations,and the recombination zones(RZs)of the blue QD-LEDs are *** RZs are identified near the hole-transport layer(HTL),confirmed by angular-dependent electroluminescence measurements and optical *** addition,in order to investigate carrier dynamics in the process of recombination,the transient electroluminescence(tr-EL)signals of the dichromatic QD-LEDs are *** a result,it is inferred that the RZ initially formed near the electron-transport layer(ETL)due to the high injection barriers of ***,due to the fast electron mobility,the RZ shifts toward the HTL as the operating current *** the device lifetime tests,the RZ remains stationary while the photoluminescence(PL)corresponding to the RZ undergoes a substantial decrease,indicating that the degradation is accelerated by the concentrated *** this study contributes to a deeper understanding of the operational mechanisms of ZnTeSe blue QD-LEDs.

关键词： quantum dots light-emitting diodes degradation recombination zones carrier dynamics

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Quantum-mechanical understanding on structure dependence of image potentials of single-walled boron nitride nanotubes

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Chinese Physics B 2024年第12期33卷 467-475页

作者： Yu Zhang Zhiman Zhang Weiliang Wang Shaolin Zhang Haiming Huang Solid State Physics&Material Research Laboratory School of Physics and Materials ScienceGuangzhou UniversityGuangzhou 510006China Research Center for Advanced Information Materials(CAIM) Huangpu Research and Graduate School of Guangzhou UniversityGuangzhou 510555China School of Physics Guangdong Province Key Laboratory of Display Material and TechnologyCenter for Neutron Science and TechnologySun Yat-sen UniversityGuangzhou 510275China

The recent discovery of field emission devices based on one-dimensional nanostructures has attracted much interest in emerging applications on next-generation flat panel displays,molecule-based sensors,and so *** achieve a comprehensive understanding of surface potentials at the nano-emitters during the tunneling process,in this study we systematically investigated the image potentials of single-walled boron nitride nanotubes with different edges,diameters and lengths in the frame of a composite first-principles *** image potentials of zigzag single-walled boron nitride nanotubes are found to be dependent on the non-equivalent *** the image potentials of isolated armchair single-walled boron nitride nanotube can be well fitted with the image potential of an ideal metal sphere of a size comparable to the tube *** the contrary,the image potentials of zigzag and grounded armchair single-walled boron nitride nanotubes exhibit a strong length-dependence characteristic and are significantly different from that of an ideal metal sphere,which originates from the significant axial symmetry breaking of induced charge at the tip for the long *** correlation between the testing electron and electronic structure of single-walled boron nitride nanotube has also been discussed.

关键词： boron nitride nanotubes quantum chemistry image potentials structure dependence

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Is the hardness of material harder than diamond reliable?

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Journal of materials Science & technology 2023年第13期144卷 111-117页

作者： Jin Liu Yongtao Zou Guodong David Zhan Pei Wang Xiaozhi Yan Duanwei He Liping Wang Institute of Atomic and Molecular Physics Sichuan UniversityChengdu 610065China School of Mechanical Engineering Jingchu University of TechnologyJingmen 448000China Academy for Advanced Interdisciplinary Studies and Department of PhysicsSouthern University of Science and TechnologyShenzhen 518055China Shenzhen Key Laboratory of Ultraintense Laser&Advanced Material Technology College of Engineering Physicsand Center for Advanced Material Diagnostic TechnologyShenzhen Technology UniversityShenzhen 518118China Drilling Technology Division Exploration and Petroleum Engineering Center-Advanced Research Center(EXPEC ARC)Saudi AramcoDhahran 31311Saudi Arabia

With the development of new synthesis methods and chemistries,a number of new superhard materials have been reported to be harder than *** such materials are highly desirable due to their wide-ranging applications,there are some inherent uncertainties in the methods utilized to determine and define the hardness of such *** this paper,we employed the standard Vickers diamond indenter and substitute indenters with the same shape to measure the hardness of nine ceramics and superhard materials within well-defined criteria and methodology,for the assessment of consistency in the hardness *** findings and the developed testing method in the current study have broad implications in characterizing new and emerging superhard materials,leading to new discoveries.

关键词： Vickers hardness Superhard materials Emerging materials Applicability

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Towards understanding and prediction of corrosion degradation of organic coatings under tropical marine atmospheric environment via a data-driven approach

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International Journal of Minerals,Metallurgy and materials 2025年第5期32卷 1151-1161页

作者： Shaopeng Liu Lingwei Ma Jinke Wang Yiran Li Haiyan Gong Haitao Ren Xiaogang Li Dawei Zhang Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China National Materials Corrosion and Protection Data Center University of Science and Technology BeijingBeijing 100083China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China Luoyang Ship Material Research Institute Sanya 572032China

The corrosion degradation of organic coatings in tropical marine atmospheric environments results in substantial economic losses across various *** complexity of a dynamic environment,combined with high costs,extended experimental periods,and limited data,places a limit on the comprehension of this *** study addresses this challenge by investigating the corrosion de-gradation of damaged organic coatings in a tropical marine environment using an atmospheric corrosion monitoring sensor and a random forest(RF)*** damage simulation,a polyurethane coating applied to a Fe/graphite corrosion sensor was intentionally scratched and exposed to the marine atmosphere for over one *** correlation analysis was performed for the collection and filtering of en-vironmental and corrosion current *** to the RF model,the following specific conditions contributed to accelerated degrada-tion:relative humidity(RH)above 80%and temperatures below 22.5℃,with the risk increasing significantly when RH exceeded 90%.High RH and temperature exhibited a cumulative effect on coating degradation.A high risk of corrosion occurred in the *** RF model was also used to predict the coating degradation process using environmental data as input parameters,with the accuracy show-ing improvement when the duration of influential environmental ranges was considered.

关键词： organic coating degradation atmospheric corrosion machine learning exposure test random forest coating sensor

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Effects of microstructure characteristics on the tensile properties and fracture toughness of TA15 alloy fabricated by hot isostatic pressing

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International Journal of Minerals,Metallurgy and materials 2023年第4期30卷 697-706页

作者： Langping Zhu Yu Pan Yanjun Liu Zhiyu Sun Xiangning Wang Hai Nan Muhammad-Arif Mughal Dong Lu Xin Lu Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Engineering TechnologyUniversity of Science and Technology BeijingBeijing 100083China AECC Beijing Institute of Aeronautical Materials Beijing 100095China Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology Beijing 100095China Institute of Artificial Intelligence University of Science and Technology BeijingBeijing 100083China Sichuan Advanced Metal Material Additive Manufacturing Engineering Technology Research Center Chengdu Advanced Metal Materials Industry Technology Research Institute Co.LtdChengdu 610300China

Powder hot isostatic pressing(HIP) is an effective method to achieve near-net-shape manufacturing of high-quality complex thinwalled titanium alloy parts, and it has received extensive attention in recent years. However, there are few reports about the microstructure characteristics on the strengthening and toughening mechanisms of powder hot isostatic pressed(HIPed) titanium alloys. Therefore, TA15powder was prepared into alloy by HIP approach, which was used to explore the microstructure characteristics at different HIP temperatures and the corresponding tensile properties and fracture toughness. Results show that the fabricated alloy has a “basket-like structure” when the HIP temperature is below 950℃, consisting of lath clusters and surrounding small equiaxed grains belts. When the HIP temperature is higher than 950℃, the microstructure gradually transforms into the Widmanstatten structure, accompanied by a significant increase in grain size. The tensile strength and elongation are reduced from 948 MPa and 17.3% for the 910℃ specimen to 861 MPa and 10% for the 970℃ *** corresponding tensile fracture mode changes from transcrystalline plastic fracture to mixed fracture including intercrystalline *** fracture toughness of the specimens increases from 82.64 MPa·m^(1/2)for the 910℃ specimen to 140.18 MPa·m^(1/2)for the 970℃ *** below 950℃ tend to form holes due to the prior particle boundaries(PPBs), which is not conducive to toughening. Specimens above 950℃ have high fracture toughness due to the crack deflection, crack branching, and shear plastic deformation of the Widmanstatten structure. This study provides a valid reference for the development of powder HIPed titanium alloy.

关键词： powder titanium alloy hot isostatic pressing strength fracture toughness

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Polymer composites designed with 3D fibrous CNT“tracks”achieving excellent thermal conductivity and electromagnetic interference shielding efficiency

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Nano research 2023年第8期16卷 11411-11421页

作者： Gui Yang Liangchun Zhou Mingjie Wang Tiantian Xiang Duo Pan Jingzhan Zhu Fengmei Su Youxin Ji Chuntai Liu Changyu Shen National Engineering Research Center for Advanced Polymer Processing Technology The Key Laboratory of Material Processing and Mold of Ministry of EducationCollege of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450002China

The rapid improvement in the running speed,transmission efficiency,and power density of miniaturized devices means that multifunctional flexible composites with excellent thermal management capability and high electromagnetic interference(EMI)shielding performance are urgently ***,inspired by the fibrous pathways of the human nervous system,a“core–sheath”fibers structured strategy was proposed to prepare thermoplastic polyurethane/polydopamine/carbon nanotube(TPU/PDA/CNT)composites film with thermal management capability and EMI shielding ***,TPU@PDA@CNT fibers with CNT shell were prepared by a facile polydopamine-assisted coating on electrospun TPU ***,TPU/PDA/CNT composites with three-dimensional(3D)fibrous CNT“tracks”are obtained by a hot-pressing process,where CNTs distributed on adjacent fibers are compactly *** fabricated TPU/PDA/CNT composites exhibit a high in-plane thermal conductivity(TC)of 9.6 W/(m·K)at low CNT loading of 7.6 wt.%.In addition,it also presents excellent mechanical properties and excellent EMI shielding effectiveness of 48.3 dB as well as multi-source driven thermal management ***,this study provides a simple yet scalable technique to prepare composites with advanced thermal management and EMI shielding performance to develop new-generation wireless communication technologies and portable intelligent electronic devices.

关键词： composites three-dimensional(3D)fibrous carbon nanotube(CNT)“tracks” in-plane thermal conductivity(TC) electromagnetic interference(EMI)shielding multi-source driven thermal management

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