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Fatigue Crack Initiation and Propagation Dominated by Crystallographic Factors in TiB/near α-Ti Composite

Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 763-776页

作者： Fanchao Meng Rui Zhang Shuai Wang Fengbo Sun Run Chen Lujun Huang Lin Geng School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Waikato Centre for Advanced Materials and Manufacturing School of EngineeringUniversity of WaikatoHamilton 3240New Zealand State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

Discontinuously reinforced titanium matrix composites(DRTMCs)with a network structure have been extensively researched due to their superior combination of strength and ***,their fatigue performance has remained *** order to elucidate the fatigue behavior of DRTMCs,a tension-tension fatigue test was performed on a TiB/nearα-Ti composite with network *** results showed that the variability of fatigue lifetime increased as the stress level *** analysis indicated that fatigue crack initiation was associated with facet formation,while the subsequent propagation was hindered by the network structure comprising TiB whiskers and *** characterization further revealed that facets formed due to a combination of shear and normal *** reduction in fatigue lifetime was attributed to an increase in the effective slip length,which was influenced by the orientation of grains near the crack-initiation sites toward basal slip in the life-limiting *** in situ observation suggested that the crack initiation was facilitated by both basal and prismatic slip ofα-Ti as well as fracture of *** propagation was found to be associated with basal and prismatic slip systems with high Schmid factors,regardless of whether the crack was intergranular or intragranular.

关键词： Titanium matrix composite TiBw Fatigue lifetime variability Crack initiation Crack propagation

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Hot deformation behavior and microstructure evolution of GH3536-TiB_(2) composites fabricated by powder metallurgy

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Science China(Technological Sciences) 2024年第7期67卷 2107-2124页

作者： ZHOU ShiPeng WANG Shuai HUANG LuJun ZHANG Rui CHEN Xin MENG FanChao CHEN Run SUN FengBo WANG CunYu GENG Lin School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Waikato Centre for Advanced Materials and Manufacturing School of EngineeringUniversity of WaikatoHamilton 3240New Zealand State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

The hot deformation behavior and microstructure evolution of GH3536-TiB2composites fabricated by powder metallurgy(PM)were examined in the temperature range of 950–1150℃ and strain rate range of 0.001–1 s^(-1). The hot compression stress-strain curves and the constitutive equation were obtained. In addition, the hot processing map was drawn, which indicated that the appropriate hot working window was 950–1050℃/0.001–0.1 s^(-1)and 1050–1100℃/0.001–0.01 s^(-1). The microstructure analysis showed that the splitting and spheroidization of M3B2led to a decrease in size and volume fraction at 950–1100℃. At 1150℃,the eutectic microstructure of M_(3)B_(2)+ γ was formed due to the dissolution of M_(3)B_(2), which caused macroscopic cracking of the deformed sample. Additionally, the deformation temperature and the strain rate had little effect on the size and volume fraction of M_(3)B_(2). Besides, discontinuous dynamic recrystallization(DDRX) and continuous dynamic recrystallization(CDRX) were found in the deformed microstructure, while the former was dominant. Within the test range of this work, the dynamic recrystallization(DRX) fraction of the deformed composites was high due to the bulging nucleation of numerous interfaces. The DRX grain size increased with increasing deformation temperature or decreasing strain rate. Texture analysis showed that the deformation texture of <101>//compression direction RD existed in the matrix when the deformation temperature was below 1100℃, and the texture type became <001>//RD at 1100℃. Additionally, it was also found that the <001>//RD texture was formed in M3B2under the strain rates of 0.1 and 0.01 s^(-1).

关键词： GH3536 alloy matrix composites powder metallurgy hot deformation behavior microstructure evolution

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Review of Research on Improved PID control in Electro-hydraulic Servo System

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Recent Patents on Engineering 2024年第1期18卷 54-68页

作者： Li, Jianying Li, Weidong Liang, Heng Kong, Lingbing Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education Harbin University of Science and Technology Harbin China College of Mechanical and Power Engineering Harbin University of Science and Technology Harbin China

Background: Proportional-integral-differential (PID) controller is widely used in the engineering field because of its simple structure, high control accuracy, and easy operation. Different patented PID control technologies have their own advantages, disadvantages, and application scenarios. Objective: By analyzing and discussing the improved PID control techniques in the electro-hydraulic servo system, some valuable conclusions have been drawn to predict the future research and development of PID control techniques. Methods: The improved PID control techniques applied to electro-hydraulic servo systems are clas-sified into three categories: PID parameter tuning technology, PID parameter online adjustment strategy and compound control strategy combined with PID algorithm. Results: By comparing the principles and characteristics of the above techniques, the advantages, disadvantages and application scenarios of each are analyzed, and the further development of PID control technology is discussed. Conclusion: Based on the characteristics of electro-hydraulic servo systems, the further combination of the three types of technology can make up for the shortcomings of PID algorithms to form a control strategy with high control accuracy, high robustness, and fast response speed. © 2024, Bentham Science Publishers. All rights reserved.

关键词： Two term control systems

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FATIGUE DAMAGE EVOLUTION ANALYSIS OF DRIVE SHAFT CONSIDERING RESIDUAL STRESS AND HARDNESS GRADIENT 10

FATIGUE DAMAGE EVOLUTION ANALYSIS OF DRIVE SHAFT CONSIDERING...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Yang, Li Wang, Liyong Li, Le Zheng, Xinhui Chang, Shuyuan Key Laboratory of Advanced Manufacturing Technology Beijing University of Technology Affiliation name of department and organisation Beijing China The Ministry of Education Key Laboratory of Modem Measurement and Control Technology Beijing Information Science & Technology University Beijing China

ISBN: (纸本)9781837242672

The service environment of the transmission shaft is complex, and it is frequently subjected to impact load. Impact fatigue is the main cause of its fatigue failure. In this study, a fatigue damage evolution analysis method of transmission shaft considering residual stress and hardness gradient is proposed under the framework of damage irreversible thermodynamics. Firstly, combined with the wave theory, the wave effect of impact stress wave is analyzed, the evolution equation of stress wave fluctuation behavior is established, and the evolution law of stress and strain field under the action of stress wave is analyzed. Then, based on the irreversible thermodynamic framework of damage, the thermodynamic state potential and dissipation potential of the damage process are studied, and the coupling characteristics of the damage evolution dynamic response and the intrinsic damage dissipation of the damaged material are analyzed. The damage evolution model of fatigue performance degradation considering residual stress and hardness gradient is established to identify the critical condition of intrinsic damage dissipation and describe the fatigue damage failure behavior. Finally, the cohesive element of the coupled damage constitutive is defined to simulate the damage evolution behavior of the substructure, and the influence of residual stress and hardness gradient on the damage evolution is explored. The results show that different initial crack forms have an important influence on the stress wave propagation behavior. The existence of residual tensile stress accelerates the process of fatigue damage accumulation, and the improvement of surface hardness can improve the fatigue resistance of the body. © The Institution of Engineering & technology 2024.

关键词： Fatigue damage

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Synergistic interaction of three-dimensional ZnCdS@MoS2 heterostructures for high-efficiency visible-light photocatalytic degradation of dyes

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Progress in Natural Science:Materials International 2023年第4期33卷 442-449页

作者： Yingjiao Zhai Haowen He Mingze Xu Hongbin Zhao Jinhua Li Ministry of Education Key Laboratory for Cross-Scale Micro and Nano Manufacturing Nanophotonics and Biophotonics Key Laboratory of Jilin Province State Key Laboratory of High Power Semiconductor Lasers Changchun University of Science and Technology State Key Laboratory of Advanced Materials for Smart Sensing General Research Institute for Nonferrous Metals

High-performance photocatalysts should urgently be developed to efficiently solve serious environmental problems. Herein, we successfully synthesized a novel, visible-light activated, three-dimensional ZnCdS@MoS2photocatalyst using a simple, two-step hydrothermal process. Based on reaction time-dependence, the growth mechanism of “oriented attachment” of the ZnCdS@MoS2heterostructure is described in detail. The photodegradation of methylene blue（MB） indicated that the prepared sample has an outstanding photocatalytic activity owing to the accelerated photogenerated electron production rate, inhibited electron–hole pair recombination,improved visible light–utilization rate, and increased specific surface area. According to our experimental results,the degradation rate of MB using the ZnCdS@MoS2nanocomposite was as high as 99.3% after 100 min of visible-light irradiation. The photocatalyst remained stable without any obvious decrease in activity even after three cycles of use. This study provides a strong support for the design of high-performance photocatalysts and their application in optoelectronic devices.

关键词： ZnCdS@MoS2 Heterostructure Photocatalytic Visible-light Dye

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Optimal Design of the Modular Joint Drive Train for Enhancing Cobot Load Capacity and Dynamic Performance

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Chinese Journal of Mechanical Engineering 2024年第3期37卷 26-40页

作者： Peng Li Zhenguo Nie Zihao Li Xinjun Liu Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipments and Control Tsinghua UniversityBeijing 100084China

Automation advancements prompts the extensive integration of collaborative robot(cobot)across a range of *** to the commonly used design approach of increasing the payload-to-weight ratio of cobot to enhance load capacity,equal attention should be paid to the dynamic response characteristics of cobot during the design process to make the cobot more *** this paper,a new method for designing the drive train parameters of cobot is ***,based on the analysis of factors influencing the load capacity and dynamic response characteristics,design criteria for both aspects are established for cobot with all optimization design criteria normalized within the design ***,with the cobot in the horizontal pose,the motor design scheme is discretized and it takes the joint motor diameter and gearbox speed ratio as optimization design ***,all the discrete values of the optimization objectives are obtained through the enumeration method and the Pareto front is used to select the optimal solution through multi-objective *** on the cobot design method proposed in this paper,a six-axis cobot is designed and compared with the commercial *** result shows that the load capacity of the designed cobot in this paper reaches 8.4 kg,surpassing the 5 kg load capacity commercial cobot which is used as a *** minimum resonance frequency of the joints is 42.70 Hz.

关键词： Multi-objective optimization Modular joint drive train design Load capacity Dynamic response performance

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Coupling effects of SiC and TiB_(2) particles on crack inhibition in Al-Zn-Mg-Cu alloy produced by laser powder bed fusion

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Journal of Materials Science & technology 2023年第33期164卷 37-51页

作者： Ning Li Ting Wang Lixia Zhang Liang Zhang State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology at WeihaiWeihai 264209China Shandong Provincial Key Laboratory of Special Welding Technology Harbin Institute of Technology at WeihaiWeihai 264209China Institute of Intelligent Manufacturing Technology Shenzhen PolytechnicShenzhen 518055China

A novel Al-Zn-Mg-Cu alloy free of cracks was produced utilizing laser powder bed fusion(LPBF)and modified with SiC and TiB_(2) *** interdependent effects of SiC and TiB_(2) particles on morphology,microstructure,and crystallographic texture were *** mechanisms behind phase evolution and crack inhibition were *** results show that a nearly dense Al-Zn-Mg-Cu alloy could be obtained when the mass fraction of SiC and TiB2 particles was 4%.TiB_(2) particles remained stable and acted as nucleation agents in the molten *** SiC particles reacted with the Al matrix to form rod-like Al_(4)C_(3),lamellate Al_(4)SiC_(4),and flocculent Si phases,which provided nucleation agents and liquid replenishment for matrix *** columnar grains of the matrix were refined into equiaxed grains,and the average size decreased from 37.15μm to 7.54μ*** preferential growth of grains along the(001)〈001〉direction was suppressed and transformed into a disordered random *** innovative Al-Zn-Mg-Cu alloy demonstrated an ultimate tensile strength of 492±12 MPa and an elongation of 7.2%±0.7%.The microhardness was enhanced,and the microhardness heterogeneity was *** solidification properties were regulated,the temperature interval between solidus and liquidus was narrowed,and the liquidity of the molten pool was *** hot cracking of Al-Zn-Mg-Cu alloy was inhibited due to the interdependent effects of grain refinement by TiB2 particles and sufficient liquid metal replenishment by SiC particles.

关键词： Laser powder bed fusion Solidification cracks Al-Zn-Mg-Cu alloys In-situ reaction Microstructure evolution

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Progress in the Understanding andModeling of Cavitation and Related Applications

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Fluid Dynamics & Materials Processing 2025年第3期21卷 445-470页

作者： Jianying Li DonglaiLi Tiefeng Li Key Laboratory of Advanced Manufacturing Intelligent Technology Ministry of EducationHarbin University of Science and TechnologyHarbin150080China School of Mechanica and Power Engineering Harbin University of Science and TechnologyHarbin150080China

Hydrodynamic cavitation,as an efficient technique applied in many physical and chemical treatment methods,has been widely used by various industries and in several technological *** generators,designed with specific structures and parameters,can produce cavitation effects,thereby enabling effective treatment and reasonable transformation of *** paper reviews the design principles,performance,and practical applications associated with different types of cavitation generators,aiming to provide theoretical support for the optimization of these *** systematically analyzes the underpinning mechanisms and the various factors influencing the cavitation phenomena,also conducting a comparative analysis of the performance of different types of *** applications dealing with wastewater treatment,chemical reaction acceleration,and other fields are discussed together with the advantages,disadvantages,and applicability of each type of cavitation *** also explore research progress in areas such as cavitation stability,energy efficiency,and equipment design *** study concludes by forecasting the application prospects of intelligent design and computational fluid dynamics(CFD)in optimizing and advancing cavitation *** proposes new ideas for the further development of cavitation technology and highlights directions for its widespread future application.

关键词： Cavitation effect cavitation generator wastewater treatment chemical reaction acceleration stability energy efficiency improvement

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A prostate seed implantation robot system based on human-computer interactions: Augmented reality and voice control

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Mathematical Biosciences and Engineering 2024年第5期21卷 5947-5971页

作者： Zhang, Xinran Zhang, Yongde Yang, Jianzhi Du, Haiyan Key Laboratory of Advanced Manufacturing and Intelligent Technology Harbin University of Science and Technology Harbin150080 China Foshan Baikang Robot Technology Co. Ltd. Foshan528237 China

The technology of robot-assisted prostate seed implantation has developed rapidly. However, during the process, there are some problems to be solved, such as non-intuitive visualization effects and complicated robot control. To improve the intelligence and visualization of the operation process, a voice control technology of prostate seed implantation robot in augmented reality environment was proposed. Initially, the MRI image of the prostate was denoised and segmented. The three-dimensional model of prostate and its surrounding tissues was reconstructed by surface rendering technology. Combined with holographic application program, the augmented reality system of prostate seed implantation was built. An improved singular value decomposition three-dimensional registration algorithm based on iterative closest point was proposed, and the results of three-dimensional registration experiments verified that the algorithm could effectively improve the three-dimensional registration accuracy. A fusion algorithm based on spectral subtraction and BP neural network was proposed. The experimental results showed that the average delay of the fusion algorithm was 1.314 s, and the overall response time of the integrated system was 1.5 s. The fusion algorithm could effectively improve the reliability of the voice control system, and the integrated system could meet the responsiveness requirements of prostate seed implantation. © 2024 the Author(s).

关键词： Iterative methods

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pH- and near-infrared light-responsive,biomimetic hydrogels from aqueous dispersions of carbon nanotubes

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Nano Research 2024年第4期17卷 3120-3129页

作者： Lulin Hu Xinxin Yu Jingcheng Hao Lu Xu Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai 264000China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Yantai Center for Food and Drug Control Yantai 264000China Key Laboratory of Colloid and Interface Chemistry&Key Laboratory of Special Aggregated Materials Shandong UniversityJinan 250100China

Owing to their low flexibility,poor processability and a lack of responsiveness,inorganic materials are usually non-ideal for constructing a living ***,to date,lifelike materials with structural hierarchies and adaptive properties usually rely on light and soft organic molecules,although few exceptions have been acquired using two-dimensional(2D)inorganic ***,with a systematic study on the gelation behavior of carbon-based 0D quantum dots,1D nanotubes,and 3D fullerenes,we find that acidified 1D carbon nanotubes(CNTs)can serve as an alternative building block for fabricating purely inorganic biomimetic soft *** as-prepared CNT gels exhibit not only a pH-or photothermal-triggered mechanical and tribological adaptivity,which allows them to simulate the behavior of sea cucumbers,peacock mantis shrimps,and mammalian muscles or cortical bones,but also a unique damping property that is similar to spider’s cuticular *** high elasticity,effective lubrication,excellent biocompatibility,and controllable friction and wear also allow them to function as a new type of smart lubricants,whose tribological properties can be regulated either by its internal pH changes or spatiotemporally by near-infrared(NIR)light irradiations,free of any toxic and flammable base oils or additives.

关键词： biomimetic hydrogels carbon nanotubes(CNTs) mechanical and tribological adaptivity pH-and near-infrared(NIR)light responsiveness switchable lubrication

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