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Additively manufactured fiber-reinforced composites:A review of mechanical behavior and opportunities

Journal of Materials Science & technology 2022年第24期119卷 219-244页

作者： Jiahui Li Yvonne Durandet Xiaodong Huang Guangyong Sun Dong Ruan Department of Mechanical Engineering and Product Design Engineering School of EngineeringSwinburne University of TechnologyHawthornVIC 3122Australia State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Hunan UniversityChangsha 410082China

Recent developments in additive manufacturing techniques have facilitated the fabrication of fiberreinforced composite *** this paper,the mechanical properties and deformation mechanisms of discontinuous and continuous fiber-reinforced composites fabricated by various additive manufacturing techniques are comprehensively *** effects of fiber type,orientation and weight/volume fraction,printing path,and stacking sequence on the mechanical properties of additively manufactured composites are *** addition,the applications of additively manufactured composites,the main challenges of the current additive manufacturing techniques,and recommendations for future work are also presented.

关键词： Additive manufacturing Discontinuous and continuous fiber-reinforced composites Mechanical properties Deformation mechanism Applications

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Limb-inspired bionic quasi-zero stiffness vibration isolator

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力学学报（英文版） 2021年第7期37卷 1152-1167页

作者： Rong Zeng Guilin Wen Jiaxi Zhou Gang Zhao State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Hunan UniversityChangsha 410082China State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Hunan UniversityChangsha 410082China School of Mechanical and Electric Engineering Guangzhou UniversityGuangzhou 510006China

Vibration reduction has always been one of hot and important topics in mechanical engineering,especially for the special measurement *** this paper,a novel limb-inspired bionic structure is proposed to generate negative stiffness and design a new quasi-zero stiffness isolator via torsion springs,distinguishing from the existing tension spring structures in the *** nonlinear mathematical model of the proposed structure is developed and the corresponding dynamic properties are further investigated by using the Harmonic Balance method and ADAMS *** evaluate the vibration isolation performance,typical three-springs quasi-zero stiffness (TS QZS) system is selected to compare with the proposed bionic *** the graphical processing unit (GPU) parallel technology is applied to perform necessary two-parameter analyses,providing more insights into the effects of parameters on the *** is shown that the proposed structure can show advantages over the typical TS QZS system in a wider vibration isolation range for harmonic excitation case and shorter decay time for the impact excitation case.

关键词： Limb-inspired bionic structure Quasi-zero stiffness Torsion springs Two-parameter analyses

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A novel cobalt-free oxide dispersion strengthened medium-entropy alloy with outstanding mechanical properties and irradiation resistance

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Journal of Materials Science & technology 2023年第21期152卷 190-200页

作者： Ao Fu Bin Liu Bo Liu Yuankui Cao Jian Wang Tao Liao Jia Li Qihong Fang Peter K.Liaw Yong Liu State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Key Laboratory of Radiation Physics and Technology of Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China State Key Lab of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996USA

A novel cobalt-free oxide dispersion strengthened(ODS)equiatomic FeCrNi medium entropy alloy(MEA)was successfully fabricated through mechanical alloying and hot extrusion(HE).The ODS FeCrNi MEA is composed of a single face-centered cubic(FCC)matrix,in which highly dispersed oxide nanoparticles,including Y_(2)Ti_(2)O_(7),Y_(2)TiO_(5) and Y_(2)O_(3),are uniformly *** with the FeCrNi MEA,the ODS FeCrNi MEA exhibits the improved yield strength(1120 MPa)and ultimate tensile strength(1274 MPa)with adequate ductility retention(12.1%).Theoretical analysis of the strengthening mechanism indicates that the high strength is mainly attributed to the grain-boundary strengthening caused by fine grains and the precipitation strengthening resulted from the oxide ***,the matrix that easily activates mechanical twinning during the deformation process is the main reason to ensure moderate *** addition,the introduction of high-density oxide nanoparticles can disperse the defect distri-bution and suppress the defect growth and irradiation-induced segregation,leading to the excellent irra-diation *** findings provide innovative guidance for the development of high-performance structural materials for future nuclear energy applications with balanced strength and ductility.

关键词： Medium-entropy alloys Irradiation Oxide nanoparticles Strength Deformation mechanism

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基于强化学习控制三连杆双足机器人实现节能周期步态

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Acta Mechanica Sinica 2023年第2期39卷 205-227页

作者：潘泽邦殷珊文桂林谭朝 State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Hunan University Changsha 410082China School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

由于双足机器人有着强非线性和非光滑性的响应特性,为双足机器人设计高性能的步态控制器依旧是一个开放的研究领域.为了克服这些挑战,本文首先提出了一个包含躯干,并考虑碰撞与摩擦的三连杆双足机器人模型.随后,采用双延迟深度确定性策... 详细信息

由于双足机器人有着强非线性和非光滑性的响应特性,为双足机器人设计高性能的步态控制器依旧是一个开放的研究领域.为了克服这些挑战,本文首先提出了一个包含躯干,并考虑碰撞与摩擦的三连杆双足机器人模型.随后,采用双延迟深度确定性策略梯度算法为该机器人设计了强化学习控制器.为了同时在下坡和上坡中实现节能周期步态,本文基于庞家莱截面法和幂函数构建了能为控制器提供学习指引的奖励函数.因此,所提出的控制器能够在不依赖于预先设计的参考轨迹或嵌入的不稳定周期步态的情况下,学会自适应输出精确的余弦力矩来实现控制目标.通过和神经网络比例微分控制器的对比研究表明,在不同的斜坡上,所提出的强化学习控制器均能实现精确、高效的周期步态,并具有较强的适应性和鲁棒性.

关键词： Three-link biped robot Deep Reinforcement learning Periodic gaits Energy optimization

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Manganese-based oxides cathodes for potassium-ion batteries: a review

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Journal of Energy Chemistry 2025年 108卷 1-18页

作者： Yue, Qinggang Xia, Maoting Zhou, Jiang Cheng, Juanjuan Lu, Bingan School of Physics and Electronics Hunan University Hunan Changsha410082 China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Hunan Changsha410082 China School of Materials Science and Engineering and Key Laboratory of Nonferrous Metal Materials Science and Engineering Ministry of Education Central South University Hunan Changsha410083 China School of Materials Science and Engineering Hunan Provincial Key Lab of Advanced Materials for New Energy Storage and Conversion Hunan University of Science and Technology Hunan Xiangtan411201 China

Potassium-ion batteries (PIBs) were recognized for their natural abundance, high theoretical output voltage, and the availability of commercialized graphite anodes. However, the development of high-performance manganese-based layered oxide cathodes—a leading candidate for PIB systems—has been fundamentally constrained by irreversible phase transitions (PT) during the cycling process, manifesting as severe structural degradation and capacity fading. This review presents a transformative paradigm integrating machine learning (ML) with multiscale characterization to analyse the complex phase transition mechanisms in Mn-based cathodes. Through systematic ML-driven interrogation of structure–property relationships, we establish quantitative descriptors for phase stability and develop predictive models for transition dynamics. Furthermore, we highlight recent breakthroughs in cross-disciplinary approaches, enabling the rational design of PT-mitigated cathode architectures. By consolidating these insights into a unified knowledge framework, this work provides strategic guidelines for developing structurally robust Mn-based cathodes and outlines future research directions for next-generation PIB systems. © 2025 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences.

关键词： Setting

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A Finite Element Human body Model of Chinese Midsize Male for Pedestrian Safety Analysis

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Journal of Bionic Engineering 2024年第6期21卷 2924-2941页

作者： Fuhao Mo Ziyang Liang Tengfei Tian Guibing Li Zhi Xiao Sen Xiao State Key Laboratory of Advanced Design and Manufacture for Vehicle Hunan UniversityChangsha410082China Department of Orthopedics The Second Xiangya Hospital of Central South UniversityChangsha410011China Department of Tuina and Spinal Orthopaedics in Chinese Medicine Shenzhen Traditional Chinese Medicine HospitalThe Fourth Clinical Medical College of Guangzhou University of Chinese MedicineShenzhen518033China Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles Hebei University of TechnologyTianjin300401China School of Mechanical Engineering Hunan University of Science and TechnologyXiangtan411201China

The anthropometric differences between European/American and Chinese population are remarkable and have significant influences on pedestrian kinematics and injury response in vehicle ***,the current study aims to develop and validate a Finite Element(FE)human body model representing the anthropometry of Chinese 50th percentile adult male for pedestrian safety analysis and development of Chinese ATDs(Anthropomorphic Test Devices).Firstly,a human body pedestrian model,named as C-HBM(Chinese Human body Model),was developed based on the medical image data of a volunteer selected according to both anthropometry and anatomy characteristics of 50th percentile Chinese adult ***,the biofidelity of the C-HBM pedestrian model was validated against cadaver impact test data reported in the literature at the segment and full-body ***,the validated C-HBM pedestrian model was employed to predict Chinese pedestrian injuries in real world vehicle *** results indicate that the C-HBM pedestrian model has a good capability in predicting human body mechanical response in cadaver tests and Chinese leg and thorax injuries in vehicle *** analysis shows that the C-HBM pedestrian model has less sliding on the hood surface,shorter movement in the horizontal direction,and higher pelvis displacement in the vertical direction than cadavers and the pedestrian model in the anthropometry of westerner due to anthropometric differences in the lower *** currently developed C-HBM pedestrian model provides a basic tool for vehicle safety design and evaluation in China market,and for development of Chinese ATDs.

关键词： Biomechanics Chinese human body model Pedestrian safety Finite element modeling

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Research on Cracking Mechanism of Aero-Engine Thermocouple Bearing Ring Under High-Temperature Creep Test

SSRN

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SSRN 2024年

作者： Wang, Songjun He, Jianjun Gong, Zhihui Cai, Yuhui Yao, Biqing Xiao, Tingyi School of Energy and Power Engineering Changsha University of Science and Technology Changsha410114 China State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Hunan University Changsha40082 China

AbstractsThe thermocouple bearing ring in aero-engine have prematurely cracked during service, posing a significant safety hazard. This paper analyzes the microstructure and fracture behavior of K4169 high-temperature superalloy specimens under thermomechanical loading considering this phenomenon. The results revealed that a small amount of needle-like δ-phases and an increased number of Laves phases accumulated around the grain boundaries after direct aging treatment. After solution treatment followed by aging, more twinning features were observed at the grain boundaries, and the Laves phase was diffusely distributed. No needle-like δ-phases were found at 710°C, indicating that the heat treatment was optimal. At 650°C, the alloy demonstrated excellent creep resistance, characterized by distinct stages of constant velocity and accelerated creep. On the specimen's surface, twins and a few dislocations appeared, while the Laves phase precipitated and partially aggregated at the grain boundaries, accompanied by the formation of small voids. As the temperature increases, the Laves phase content increases along with the formation of voids. These Laves phases were accompanied by needle-like δ phases, forming 'bands' that facilitated crack initiation, primarily along the grain boundaries. At 650°C, secondary cracks appeared at the fracture, indicative of predominantly ductile fracture behavior. With an increase in temperature to 710°C, precipitation of the second phase increased significantly, leading to pronounced stress concentration. Consequently, the fracture mode transitioned from ductile fracture to a ductile-brittle mixed fracture. © 2024, The Authors. All rights reserved.

关键词： Grain boundaries

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A Chip-Wound Inductors Defect Detection Method Based on Object Detection and Semantic Segmentation

SSRN

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SSRN 2024年

作者： Wang, Zhuanwang Yang, Wenfeng Hu, Zhaochuan Zhang, Hang Liu, Jian Li, Rong Chen, Bing Li, Mingze State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Hunan University Changsha410082 China College of Automotive and Mechanical Engineering Changsha University of Science and Technology Changsha410114 China

The accurate and efficient detection of chip-wound inductors is of paramount importance in the production of electronic components and the application and development of related products. Nevertheless, conventional detection techniques are inadequate to meet the demands of the diverse types, high precision, and high efficiency of detection required at this time. This study proposes a deep learning-based method for the detection of diverse types of defects in chip-wound inductors. The method addresses the issue of multiple types of appearance defects and high detection difficulty by combining object detection and semantic segmentation. Firstly, the large convolutional kernel mechanism is introduced to You Only Look Once version 8 (YOLOv8), the backbone structure is based on Large Selective Kernel Network (LSKNet), and the LK-selected sub-block is improved, which enables the accurate detection of solder void and crush defects in inductors. Subsequently, the U-Net (UNet) semantic segmentation model was employed, and the Convolutional Block Attention Module (CBAM) mechanism was introduced to enhance the feature extraction capability and achieve accurate segmentation of the inductor region. This was followed by pattern recognition of the position and size defects of the inductor based on the segmentation results. The experimental results show that the proposed diverse types of detection method demonstrated a defect recognition accuracy of up to 99.60% and an efficiency of 0.23s/each, effectively and efficiently detecting the inductor's defects. Furthermore, the improved YOLOv8 network achieved 90.95% mean average precision (mAP), while the improved UNet network achieved 87.57% mean intersection over union (MioU), outperforming other networks. © 2024, The Authors. All rights reserved.

关键词： Semantic Segmentation

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Research on Cracking Mechanism of Aero-Engine Thermocouple Bearing Ring Under High-Temperature Creep Test

SSRN

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SSRN 2024年

The thermocouple bearing ring in aero-engine have prematurely cracked during service, posing a significant safety hazard. This paper analyzes the microstructure and fracture behavior of K4169 high-temperature superalloy specimens under thermomechanical loading considering this phenomenon. The results revealed that a small amount of needle-like δ-phases and an increased number of Laves phases accumulated around the grain boundaries after direct aging treatment. After solution treatment followed by aging, more twinning features were observed at the grain boundaries, and the Laves phase was diffusely distributed. No needle-like δ-phases were found at 710°C, indicating that the heat treatment was optimal. At 650°C, the alloy demonstrated excellent creep resistance, characterized by distinct stages of constant velocity and accelerated creep. On the specimen's surface, twins and a few dislocations appeared, while the Laves phase precipitated and partially aggregated at the grain boundaries, accompanied by the formation of small voids. As the temperature increases, the Laves phase content increases along with the formation of voids. These Laves phases were accompanied by needle-like δ phases, forming 'bands' that facilitated crack initiation, primarily along the grain boundaries. At 650°C, secondary cracks appeared at the fracture, indicative of predominantly ductile fracture behavior. With an increase in temperature to 710°C, precipitation of the second phase increased significantly, leading to pronounced stress concentration. Consequently, the fracture mode transitioned from ductile fracture to a ductile-brittle mixed fracture. © 2024, The Authors. All rights reserved.

关键词： Grain boundaries

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A versatile 3D-printable hydrogel for antichondrosarcoma,antibacterial,and tissue repair

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Journal of Materials Science & technology 2023年第5期136卷 200-211页

作者： Wenxiang Zhu Zheng Zhou Yuting Huang Hairong Liu Ning He Xiaolong Zhu Xiaoxiao Han Dengming Zhou Xuanchu Duan Xin Chen Yahui He Xiaolin Meng Shuai Zhu College of Materials Science and Engineering Hunan UniversityChangsha 410082China College of Biology Hunan UniversityChangsha 410082China State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Hunan UniversityChangsha 410082China Department of Ophthalmology The Second Xiangya HospitalCentral South UniversityChangsha 410011China Aier Glaucoma Institute Changsha 410000China Aier School of Ophthalmology Central South UniversityChangsha 410000China Changsha Aier Eye Hospital Aier Eye Hospital GroupChangsha 410000China

Following operative treatment of chondrosarcoma,post-surgery tissue reconstruction may be confronted with daunting challenges,including the delayed self-repair of defective tissue,tumor recurrence,and bac-terial *** overcome these challenges,a methacrylic anhydride(MA)modified sericin(SerMA)solution mixed with procyanidins(PC)loaded polydopamine(PDA)modified ZIF-8(PC@ZIF-8@PDA)nanoparticles to form a multifunctional PC@ZIF-8@PDA/SerMA hydrogel after exposure under blue *** products with pre-designed shapes were printed out by using the SerMA solution carrying PC@ZIF-8@PDA nanoparticles and chondrocytes,indicating that PC@ZIF-8@PDA/SerMA hydrogels with personalized shapes can be fabricated via 3D *** PC@ZIF-8@PDA/SerMA hydrogel is able to kill chondrosarcoma cells and bacteria,like Staphylococcus aureus(***),and Escherichia coli(***),by its photothermal activity combined with near-infrared radiation(NIR).The PC@ZIF-8@PDA/SerMA hydrogel exhibited an antioxidative activity and a good biocompatibility and was easily monitored by its florescent and photoacoustic *** articular cartilage defects were efficiently repaired by PC@ZIF-8@PDA/SerMA hydrogels with encapsulated corresponding autologous chondrocytes,and mice skin burning wounds were swiftly regenerated by applying this ***,the PC@ZIF-8@PDA/SerMA hydrogel can be potentially applied to the clinic treatment of chondrosarcoma and tissue defect repair after chondrosarcoma resection due to its multifunction in the future.

关键词： Hydrogel Sericin ZIF-8 Chondrosarcoma Cartilage repair

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