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2024 9th International Conference on Mechanical Structures and Smart Materials, ICMSSM 2024

作者： Xinhai, Zhao Xuemei, Liu Zhiyuan, Si Chao, Zheng Yongchao, Tan State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Shandong Jinan250061 China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Shandong Jinan250061 China Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong Wollongong2522 Australia Engineer Training Center Shandong University Jinan2500002 China

In order to improve the surface quality of incremental forming parts, this paper is studied. Through numerical simulation, the influence rules of different overlapping materials and overlapping thickness on the forming quality of target parts are obtained, and the optimal forming process parameters are given. Compared with the experimental results, the better forming results were obtained. © Published under licence by IOP Publishing Ltd.

关键词： Digital elevation model

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A Study on Improving Friction and Wear Performance of Bearing Bush in Radial Piston Hydraulic Motor

SSRN

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SSRN 2024年

作者： Li, Ying Cui, Xueshi Yang, Yasen Zhang, Jin Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University China Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University Ministry of Education of China China

The radial piston hydraulic motor is widely used due to its ability to provide high torque output and stable speed control. However, it exhibits poor lubrication performance in low-speed, heavy-load conditions. Specifically, the friction and wear performance of the piston-roller friction pair directly affect the motor's starting torque, operational efficiency, and service life. To address the friction and wear issues of the piston-roller friction pair, a self-lubricating composite bearing bush is introduced between the friction pairs. The present study investigates the wear and friction properties of self-lubricating material sliding against bearing steel(GCr15SiMn). The materials are neat Poly Ether Ether Ketone (PEEK), PEEK with 10% Polytetrafluoroethylene (PTFE) and15% Potassium Titanate Whiskers (PTW). Additionally, the role of filler (i.e., nano-silica) in the PEEK-PTFE-PTW-bearing steel hybrid wear system is investigated. The composite materials have undergone surface modification using a silane coupling agent (KH550) to enhance the adhesion performance between the filler and the matrix. Imitating the working condition of the piston-roller friction pair, experiments are conducted under boundary lubrication conditions on a ring-to-disc tribometer. The worn surfaces were examined using confocal laser scanning microscopy and scanning electron microscopy. The results indicate that self-lubricating materials filled with 2% and 3% nanoscale silicon dioxide achieved the best tribological performance. © 2024, The Authors. All rights reserved.

关键词： Friction

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Image Segmentation Algorithm on Sand Image Based on Improved MRF 37

Image Segmentation Algorithm on Sand Image Based on Improved...

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37th Youth Academic Annual Conference of Chinese Association of Automation, YAC 2022

作者： Wen, Xiaobang Rong, Wenjuan Cao, Xueting Wang, Mingzhao Wang, Chao State Key Laboratory of Advanced Forming Technology & Equipment China Academy of Machinery Science and Technology Group Beijing China Yunnan Machinery Research & Design Institute China Academy of Machinery Science and Technology Group Beijing China

ISBN: (纸本)9781665465366

The dimensional accuracy inspection is an important part of the sand print forming process, which is currently dominated by visual inspection or manual measurement with low efficiency and poor stability. In order to improve the visual inspection accuracy of sand mold forming in the process of sand mold 3D printing, this thesis proposes an improved Markov random field sand image segmentation algorithm. Be directed against the problems such as tooth-shaped edges after sand image segmentation, this thesis combines ICM theory with Markov random field algorithm, adds the potential function against tooth-shaped edges, fuses the energy fields of three likelihood functions to calculate the label field probability, and segments the sand-shaped image according to the energy minimum criterion. The experimental results show that the algorithm in this thesis can reduce the probability of tooth-shaped edge features, and the edge IOU is improved by 17.05 percent when compared with the threshold segmentation. In addition, the algorithm in this thesis is able to realize the accurate segmentation of sand image and improve the visual inspection accuracy, which provides a basis for online detection of sand mold accuracy. © 2022 IEEE.

关键词： Image segmentation

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Synergistic Liquid Metal-Diamond-Reinforced Poly(ionic liquid) Composites for High Thermal Conductivity and Excellent Reliability

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ACS applied materials & interfaces 2025年第22期17卷 2025 May 24页

作者： Baohao Yang Jianhui Zeng Xin Luo Zhaoyu Lin Meng Han Linlin Ren Rong Sun Yimin Yao State Key Laboratory of Materials for Integrated Circuits Shenzhen Institute of Advanced Electronic Materials Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China. School of Nano Science and Technology University of Science and Technology of China Suzhou 215123 China. Guangdong Key Laboratory for Processing and Forming of Advanced Metallic Materials School of Mechanical & Automotive Engineering South China University of Technology 381 Wushan Guangzhou 510640 China.

This study presents a thermally conductive composite material that combines poly(ionic liquid) (PIL) poly(1-octyl-3-vinylimidazole)bis(trifluoromethanesulfonyl)imide (P[OVIm]NTf), liquid metal (LM), and diamond as dual fillers, totaling 85 vol % loading. The composite achieves a thermal conductivity of 14.2 W m K, a tensile elongation of 74%, and an interfacial adhesion strength of 0.99 MPa on steel substrates. Structural optimization and interfacial engineering contribute to its exceptional mechanical flexibility and processability, confirmed by dynamic rheological analysis. In chip packaging tests, the composite enhances heat dissipation efficiency by reducing interfacial thermal resistance. Diamond incorporation prevents LM oxidation, maintaining 99% surface coverage and minimal performance degradation after aging tests (-55 to 125 °C, 300 cycles; 150 °C, 1000 h). Chromium-plated diamond further improves reliability under high humidity and temperature. This ternary system resolves the trade-off between high filler loading and flexibility in thermal interface materials. Interfacial reinforcement and synergistic stabilization mechanisms balance thermal conductivity with long-term reliability. These findings promote the use of poly(ionic liquid)s in thermal management, offering a durable solution for high-power electronics, especially in extreme conditions. The study establishes a framework for designing advanced TIMs with optimized performance and stability.

关键词： diamond liquid metals poly(ionic liquid) reliability thermal interface materials

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A novel correction method to improve the IR measurement accuracy of cutting tool and workpiece temperature 4

A novel correction method to improve the IR measurement accu...

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4th International Conference on advanced Optics and Photonics Research in Engineering, AOPR 2024

作者： Zheng, Lirui Zhao, Jinfu Liu, Zhanqiang Wang, Bing Song, Wenjing School of Mechanical Engineering Shandong University Jinan250061 China State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Jinan250061 China Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education Jinan250061 China Key National Demonstration Center for Experimental Mechanical Engineering Education Jinan250061 China School of Mechanical Electrical & Information Engineering Shandong University Weihai264209 China

ISBN: (纸本)9781510682610

Accuracy measurement of cutting temperature could help to illustrate the influencing mechanisms of cutting heat on the tool wear and machined surface integrity. The infrared (IR) thermal imager is often utilized to measure cutting temperature, but the assumption of one thermal emissivity on the whole scene limits the measurement accuracy of temperature value. In this research, a novel correction method to improve the IR measurement accuracy of cutting temperature was proposed. Firstly, a fast thermal emissivity measurement method was given to determine the suitable thermal emissivity of WC/Co carbide tool and Inconel 718 workpiece. Secondly, the regions of cutting tool and workpiece are identified with an image segmentation method, which is assigned with the determined suitable thermal emissivity to obtain the temperature field. Lastly, the corrected temperature field is verified to be accurate based on the designed simulating experiments. This method could be taken as a potential to improve IR measurement accuracy of temperature in the future. © 2024 SPIE.

关键词： Carbide cutting tools

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Engineering vascularized organotypic tissues via module assembly

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International Journal of Extreme Manufacturing 2024年第1期6卷 155-175页

作者： Zhenzhen Zhou Changru Liu Yuting Guo Yuan Pang Wei Sun Biomanufacturing Center Department of Mechanical EngineeringTsinghua UniversityHaidian DistrictBeijing 100084People’s Republic of China Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing Beijing 100084People’s Republic of China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing 100084People’s Republic of China Department of Mechanical Engineering Drexel UniversityPhiladelphiaPA 19104United States of America

Adequate vascularization is a critical determinant for the successful construction and clinical implementation of complex organotypic tissue models. Currently, low cell and vessel density and insufficient vascular maturation make vascularized organotypic tissue construction difficult,greatly limiting its use in tissue engineering and regenerative medicine. To address these limitations, recent studies have adopted pre-vascularized microtissue assembly for the rapid generation of functional tissue analogs with dense vascular networks and high cell density. In this article, we summarize the development of module assembly-based vascularized organotypic tissue construction and its application in tissue repair and regeneration, organ-scale tissue biomanufacturing, as well as advanced tissue modeling.

关键词： vascularized organotypic tissue module assembly regenerative medicine tissue engineering

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Effect of Intensification Pressure on Eutectic Si Segregation of Al-12Si-1Cu Alloy in Squeeze Casting 3

Effect of Intensification Pressure on Eutectic Si Segregatio...

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2023 3rd International Conference on Industrial Manufacturing and Structural Materials, IMSM 2023

作者： Zhang, Rumeng Li, Longfei Chen, Yunbo Feng, Jian Li, Chunming Zhao, Xuesheng Chen, Lin Zuo, Lingli Zhang, Yang State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science & Technology Group Beijing100083 China Beijing National Innovation Institute of Lightweight Ltd. Beijing100083 China GRIMAT Engineering Institute Co. Ltd. Beijing101407 China

Squeeze casting is an advanced technology to produce aluminum alloy components with excellent mechanical property. Due to good fluidity and castability, the Al-Si alloy is the most common aluminum material in squeeze casting. However, the segregation in solid α-Al phase and liquid eutectic Si phase happens during solidification, which leads to microstructural inhomogeneous in the final microstructure. In this study, the eutectic Si segregation of Al-12Si-1Cu alloy under different intensification pressure in squeeze casting was investigated by Optical Microscopy (OM). The results show that increasing intensification pressure promotes the eutectic Si segregation at center zone, while the eutectic Si phase at skin zone is not much influenced. Increasing the intensification pressure from 65 MPa to 140 MPa, the segregation degree of eutectic Si at center zone increases from 0.05 to 0.29, while the segregation degree at skin zone levels at 0.2. Under high intensification pressure, the feeding effect of liquid phase at center zone is prominent, which results to high tendency of eutectic Si segregation in the final microstructure. © 2023 Institute of Physics Publishing. All rights reserved.

关键词： Silicon alloys

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Effect of Shell Dwell Time and Cooling Conditions on Shrinkage Defects of Superalloy Turbine Blade in Investment Casting 75

Effect of Shell Dwell Time and Cooling Conditions on Shrinka...

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75th World Foundry Congress, WFC 2024

作者： Zhang, Pan Xiao, Yizhou Wang, Donghong Huang, Zhen Zhu, Guoliang Sun, Baode Shanghai Key Laboratory of Advanced High Temperature Materials and Precision Forming School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China School of Materials Science and Engineering Shanghai University of Engineering and Technology Shanghai200240 China

This study employed finite element simulation to investigate the effects of the mold dwell time and cooling conditions before melt pouring process on the shrinkage defects of Inconel 718 superalloy turbine blade. The simulation results suggest that with the mold dwell time increasing from 0s to 180s, the shell temperature drops from 1000 °C to 680 °C and the total shrinkage volume increases from 5.19 cm3 to 6.14 cm3, however, the two types of mold shell insulation measures, addition of insulation cotton and sand filling, reduced the shrinkage volume to 3.26 cm3 and 3.76 cm3 respectively. This phenomenon was mainly caused by the mold shell temperature dropping and rising in the superalloy casting. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Turbomachine blades

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Deformation, Damage and Fracture Behaviours of TWIP Steels Based on CZM-CPFEM at High Temperature 14th

Deformation, Damage and Fracture Behaviours of TWIP Steels B...

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14th International Conference on technology of Plasticity, ICTP 2023

作者： Cai, Wang Sun, Chaoyang Zhang, Hongjia Wang, Chunhui Fu, M.W. School of Mechanical Engineering University of Science and Technology Beijing Beijing100083 China Beijing Key Laboratory of Lightweight Metal Forming Beijing100083 China Vibration and Acoustics Research Group Laboratory of Science and Technology On Integrated Logistics Support College of Intelligence Science and Technology National University of Defense Technology Changsha410073 China Department of Mechanical Engineering Research Institute for Advanced Manufacturing The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong

ISBN: (纸本)9783031413407

Grain boundaries (GBs) are the most vulnerable areas of metals during high temperature forming and processing where microcracks are highly likely to affect their macroscopic properties, resulting in fracture and ultimately reduced service life. In order to investigate the mechanisms of micro- and nano-scale damage evolution, microcrack initiation and propagation, GBs must be included as a crucial consideration in the theoretical and modelling solutions. Thus, to accurately illustrate the influence mechanisms of GBs on the mechanical behaviours, the cohesive zone model (CZM) considering GB damage evolution and the crystal plasticity finite element model (CPFEM) coupling slip and twinning inside the grain, were combined to propose a micromechanical mechanism of TWIP steels, which is applicable to predict the strengthening, damage and fracture of TWIP steels under high temperature. The CZM-CPFE method was confirmed by in situ SEM experiments at 750 ℃. The representative volume elements (RVEs) are constructed to predict the high temperature deformation behaviour of TWIP steels with different grain sizes and initial microdefects to obtain the influence of different initial states on the high temperature deformation behaviour, which can provide the solid theoretical basis for the subsequent manufacturing and forming processes of TWIP steel sheets. This work not only fills the gap in theoretical modelling of TWIP steels in the field of hot processing and manufacturing, but also provides some research approaches and analysis strategies for the GB damage behaviour of polycrystalline materials at high temperatures. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Grain boundaries

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Establishment of Sheet Plastic Wrinkling Instability WLD and Study on Strain Distribution Characteristics in Instability Region 13th

Establishment of Sheet Plastic Wrinkling Instability WLD and...

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13th International Conference on the technology of Plasticity, ICTP 2021

作者： Du, Bing Li, Han Xie, Jun Song, Pengfei Zhao, Changcai Key Laboratory of Advanced Forging Stamping Technology and Science Yanshan University Ministry of Education of China Qinhuangdao City066004 China

ISBN: (纸本)9783030753801

In the field of thin-plate plastic forming, the efficient and accurate prediction and control of wrinkles are the basis for product and mold design and process flow formulation. In this paper, a diagonal tensile test of a square plate is taken as an example, and a numerical simulation model for plastic wrinkle analysis of a thin plate is established by using ABAQUS. On this basis, the morphology and characteristics of the critical wrinkle main strain diagram (WLD) under the condition of nonuniform tension are investigated. The distribution position relationship between the strain value at different positions in the deformation region of the specimen and the critical wrinkle main strain curve (WLD) is discussed. The research content of this paper provides ideas for determining the wrinkle instability and establishing the wrinkle critical line under other various bearing conditions. © 2021, The Minerals, Metals & Materials Society.

关键词： Stability

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