检索结果-内蒙古大学图书馆

2021 7th International Conference on Mechanical Engineering, Materials and Automation technology, MMEAT 2021

作者： Ailing, Z.O.U. Zhongde, Shan Yiwei, Chen Shaozong, Wang Xiaojun, L.I.U. State Key Laboratory of Advanced Forming Technology and Equipment of China Academy of Machinery Science and Technology Beijing China Beijing National Innovation Institute of Lightweight Ltd. Beijing China Nanjing University of Aeronautics and Astronautics Nanjing China

In order to improve the interlaminar shear property of the composites manufactured by the additive of aramid fiber (AF) reinforced with polylactic acid (PLA), the preparation process of AF reinforced thermoplastic resin composite micro-wires has been optimized, which could promote impregnated and toughness. The influence of different water bath temperatures on the interlaminar shear properties of the composites was studied. And the results showed that the largest interlaminar shear strength (ILSS) of AF/PLA composite material was 12.0 MPa, which had confirmed in the water bath temperature of 30 C. As the bath temperature increased, the interlaminar shear performance decreased, and the ILSS of composite micro-wires in 70 C water bath was 74.67% of that in 30 C water bath. The composite fiber with high impregnation degree and good toughness has laid a foundation for further research on additive manufacturing of AF/PLA composite. © Published under licence by IOP Publishing Ltd.

关键词： Reinforcement

来源：评论

学校读者我要写书评

暂无评论

Theoretical and experimental study of phase transformation and twinning behavior in metastable high-entropy alloys

引用

Journal of Materials Science & technology 2022年第4期99卷 161-168页

作者： Zhibiao Yang Song Lu Yanzhong Tian Zijian Gu Jian Sun Levente Vitos Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Applied Materials Physics Department of Materials Science and EngineeringRoyal Institute of TechnologyStockholm SE-10044Sweden Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Division of Materials Theory Department of Physics and Materials ScienceUppsala UniversityP.O.Box 516Uppsala SE-75120Sweden Research Institute for Solid State Physics and Optics Wigner Research Center for PhysicsBudapest H-1525P.O.Box 49Hungary

Combined theoretical and experimental efforts are put forward to study the critical factors influencing deformation mode transitions in face-centered cubic *** revisit the empirical relationship between the stacking fault energy(SFE)and the prevalent deformation *** ab initio calculated SFE,we establish the critical boundaries between various deformation modes in the model Cr-Co-Ni solid solution *** agreement between theoretical predictions and experimental observations are *** findings shield light on applying quantum mechanical calculations in designing transformation-induced plasticity and twinning-induced plasticity mechanisms for achieving advanced mechanical properties.

关键词： Metastable alloys Stacking fault energy Twinning Martensitic transformation Co-Cr-Ni alloys

来源：评论

学校读者我要写书评

暂无评论

Development of Predictive Maintenance System for Nuclear Power Turbine Unit

Development of Predictive Maintenance System for Nuclear Pow...

引用

International Conference on Artificial Intelligence and Computer Information technology (AICIT)

作者： Junhao Tang Dongdong You Fenglei Li Yong Cheng Guangdong Key Laboratory for Advanced Metallic Materials Processing National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials Guangdong China Beijing Qingtai Data Technology Co. Ltd Beijing China

The safe operation of nuclear power plants is the most concerned issue in the nuclear power industry. Intelligent early warning and predictive maintenance of mechanical equipment such as steam turbines can effectively prevent nuclear power plant safety accidents and reduce maintenance costs. This paper will introduce the architecture and process of predictive maintenance system and apply it to nuclear power steam turbine units. The developed predictive maintenance system of nuclear power steam turbine units is equipped with LSTM-Bayes signal anomaly recognition method, benchmarking other manufacturers' systems, and improving many indicators. For example, new early warning parameters such as abnormal probability, remaining useful life and characteristic signals are added to help maintenance, making it more intelligent. It has been verified that the input of the system reduces the failure rate of mechanical equipment, saves maintenance costs, can effectively ensure safe operation, improve productivity and reduce costs.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Effect of pattern-less forming process on quality of sand mold surface 2nd

Effect of pattern-less forming process on quality of sand mo...

引用

2nd International Conference on Materials Science and Industrial Applications, MSIA 2020

作者： Guo, Lijun Shan, Zhongde Jiang, Erbiao State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science and Technology Beijing100044 China

ISBN: (纸本)9783035715958

The pattern-less sand mold was used as the research object, surface quality of sand mold was carried out by using surface abrasion tester. In this paper, the influence of sand material such as the types of sand, resin contents and extrusion pressure on the surface quality was studied through the single-factor test. The results showed that: Different sand mold had different surface abrasive resistance. The angle coefficient of sand has a great influence on the surface abrasive resistance of the sand mold. With the increase of extrusion force, the surface abrasive resistance of sand mold increased. And as the resin content increased, the surface abrasive resistance of sand mold continued to increase. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Sand

来源：评论

学校读者我要写书评

暂无评论

Investigation of microstructures and properties of graphene reinforced 20CrMnTi materials 8

Investigation of microstructures and properties of graphene ...

引用

2022 8th International Conference on Mechanical Engineering, Materials and Automation technology, MMEAT 2022

作者： Lu, Xiaogang Li, Yongsheng Meng, Zhongwen Chen, Yunbo State Key Laboratory of Advanced Forming Technology and Equipment Beijing National Innovation Institute of Lightweight Ltd Beijing100083 China Shandong Tianrui Heavy Industry Co. Ltd Weifang261061 China Center of Materials Science and Engineering School of Mechanical and Electronic Control Engineering Beijing Jiaotong University Beijing100044 China

As a member of low-carbon alloy steels, 20CrMnTi has been widely used to manufacture key-parts, such as gears and shafts, owing to its attractive fatigue resistance and easy of processing. To improve its the mechanical and frictional properties, the preparation of composite is required. In the present study, graphene was added in 20CrMnTi to form Gr/20CrMnTi composites by vacuum high-energy ball milling process and hot-pressing technique. The addition of graphene has a profound influence on the microstructure and properties of 20CrMnTi. A high hardness of 5.83 GPa and a good tensile strength of 1183 MPa were obtained in the 0.5 wt.%-Gr/20CrMnTi, increased by 18.5% and 27.8%, respectively. Meanwhile, the wear resistance reaches a maximum value of 2276.5 cm-3 in the 0.7 wt.%-Gr/20CrMnTi, showing a 491.1% increase than that of pure 20CrMnTi. The layered graphene played an important role in absorbing energy and preventing the propagation of micro-crack. © Published under licence by IOP Publishing Ltd.

关键词： Graphene

来源：评论

学校读者我要写书评

暂无评论

Design of a New Engine Hood based on Lattice Structure for Pedestrian Protection 7

Design of a New Engine Hood based on Lattice Structure for P...

引用

2021 7th International Forum on Manufacturing technology and Engineering Materials, IFEMMT 2021

作者： Liu, Meng Sun, Fuzhen Wang, Baoming Wang, Jianfeng Yang, Na State Key Laboratory of Advanced Forming Technology and Equipment Beijing100044 China University of Science and Technology Beijing100083 China Weihai Guangwei Group Corporation Weihai264200 China School of Automotive Engineering Harbin Institute of Technology Weihai264209 China

This paper designs four kinds of three-dimensional negative Poisson's ratio lattice structures, based on the two-dimensional concave hexagonal negative Poisson's ratio honeycomb structure. Different parameters are designed for simulation analysis and experimental research, and the influence of different parameters on Poisson's ratio is studied respectively. The main contents are as follows: Firstly, the three-dimensional solid model of lattice structure is established by modeling software, and the different structural parameters are determined, and the equivalent mechanical model is established. And according to the relevant structural parameters to establish the test scheme. Then, the finite element software is used to simulate the test core material with different parameters. According to the simulation results, the influence of different parameters on Poisson's ratio is found out. Then the crashworthiness of the test board with different parameters is simulated and analyzed. According to the results, the most suitable structure is selected and applied to the engine hood. Finally, the simulation experiment of collision between pedestrian head and engine hood is carried out. The results of this paper compare the performance of lattice sandwich panels with different parameter structures in different tests and select the optimal combination of structural parameters. The adjustment and optimization direction of the structure is put forward according to the test results. © Published under licence by IOP Publishing Ltd.

关键词： Honeycomb structures

来源：评论

学校读者我要写书评

暂无评论

Study on Automobile Front-End Structure Based on Pedestrian Leg Protection 7

Study on Automobile Front-End Structure Based on Pedestrian ...

引用

2021 7th International Forum on Manufacturing technology and Engineering Materials, IFEMMT 2021

According to the pedestrian leg protection regulations, a collision with the simplified finite element model of the leg was carried out on the basis of incorporating EPP foam materials with different foaming rates and cushioning into the simplified front-end structure of the car. The results show that the front-end foam energy-absorbing structure of the vehicle cannot meet the pedestrian leg protection regulations. This paper designs a thin-walled steel structure and applies it to the front-end structure of the vehicle. After collision simulation with a simplified finite element model of the leg, the pedestrian's tibial acceleration, knee joint shear displacement and knee joint bending angle are compared and analyzed. Pedestrian leg injury parameters, the results show that thin-walled steel structure is more suitable for giving full play to the energy absorption effect in an environment with insufficient energy absorption space than foam energy absorption structure. © Published under licence by IOP Publishing Ltd.

关键词： Energy absorption

来源：评论

学校读者我要写书评

暂无评论

Modulation of Catalyst Interfacial Electric Field and Charge Transfer Promotes Nis-Modified Cowo4/Znin2s4 S-Scheme Heterojunction for Efficient Photocatalytic Hydrogen Evolution

SSRN

引用

SSRN 2024年

作者： Dou, Jianmin Liu, Xiaojie Dou, Mingyu Yang, Guang Liu, Erkang Li, Zeming Han, Baochen Yang, Hua Li, Dacheng Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology School of Chemistry and Chemical Engineering Liaocheng University Liaocheng252059 China Hebei Key Laboratory of Material Near-Net Forming Technology School of Material Science and Engineering Hebei University of Science and Technology 26 Yuxiang Street Shijiazhuang050018 China Institute of Powder Metallurgy and Advanced Ceramics School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China

The strategic post-synthetic modification of engineered S-scheme heterojunctions represents a potent and manipulable approach to significantly enhance photocatalytic activity. This study details the synthesis of innovative photocatalysts via the deposition of NiS nanoparticles onto S-scheme heterojunctions of CoWO4/ZnIn2S4 (CWO/ZIS-NiS), facilitated by solvothermal and photochemical methodologies. Under visible light irradiation, the hydrogen production rate of CWO/ZIS-NiS was 22.398 mmol·g−1·h−1, which 15 times higher than that of the ZnIn2S4. XPS, EPR, SPV and DFT calculations were used to analyze the charge transfer path and the reasons for the performance improvement of the catalyst. The construction of theS-scheme CoWO4/ZnIn2S4 heterojunction, along with NiS modification to enhance the interfacial electric field (IEF) and act as a reaction center, was identified as the primary reason for the enhanced hydrogen production activity. This work provides guidance for the design of efficient photocatalytic systems using the synergistic effect between cocatalysts and S-scheme heterojunctions. © 2024, The Authors. All rights reserved.

关键词： Heterojunctions

来源：评论

学校读者我要写书评

暂无评论

Strengthening Mechanisms and Deformation Behavior of a Non-Equiatomic Ni35Co27.5Cr27.5Al5Ti5 High-Entropy Alloy with Spherical L12 Nanoprecipitates

SSRN

引用

SSRN 2023年

作者： Huang, Liran Fu, Zhiqiang Chu, Chenliang Chen, Weiping Wang, Hao Zhu, Dezhi Guangdong Key Laboratory for Advanced Metallic Materials Processing South China University of Technology Guangdong Guangzhou510641 China National Engineering Research Center of Near-net-shape Forming for Metallic Materials South China University of Technology Guangzhou510641 China

Introducing L12 precipitates into face-centered-cubic (FCC) structured equiatomic CoCrNi medium-entropy alloy (MEA) is an effective means to improve its disappointing strength (2 precipitates are usually obtained by complicated thermomechanical processing (TMP), accompanying the presence of cellular L12 precipitates at the grain boundaries (GBs) which are detrimental to the mechanical properties. In this work, we designed and fabricated a non-equiatomic Ni35Co27.5Cr27.5Al5Ti5 HEA consisting of sole spherical L12 nanoprecipitates without any other phases via a simplified short-term heat treatment processing, i.e., casting followed by homogenization and aging. The as-cast, homogenized and aged HEA all possess equiaxed grains, in the meantime, the as-cast HEA exhibits equiaxed dendritic microstructure. In the as-cast and aged HEA, spherical L12 nanoprecipitates are uniformly distributed in the FCC matrix, and the L12 nanoprecipitates of the aged HEA have smaller size and higher volume fraction in comparison with those of the as-cast HEA. The aged Ni35Co27.5Cr27.5Al5Ti5 HEA has the best mechanical properties among the three states, exhibiting a tensile yield strength of ~916 MPa, an ultimate tensile strength of ~1220 MPa, and a total elongation of ~21.5%. Precipitation strengthening is primarily responsible for the aged HEA. Digital image correlation (DIC) images corresponding to the tensile testing have shown that the homogenized and aged HEA exhibit uniform deformation, whereas the stress concentration could be observed in the as-cast HEA. Additionally, electron channeling contrast imaging (ECCI) analyses reveal that multiple deformation mechanisms including coherent L12 precipitates, the stacking fault (SF) network, the high-density dislocation walls (HDDWs) and dislocation cells, jointly acted as the dislocation obstacles for the aged HEA, contributing to the excellent strain-hardening ability for the outstanding strength-ductility synergy. © 2023, The Authors. All

关键词： Tensile testing

来源：评论

学校读者我要写书评

暂无评论

The heterogeneous compensation for the infiltrative error of the binder jetting additive manufacturing processes 26

The heterogeneous compensation for the infiltrative error of...

引用

26th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2015

作者： Ma, Xulong Lin, Feng Zhang, Lei Key Laboratory for Advanced Materials Processing Technology Ministry of Education of China Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing Rapid Forming Center Department of Mechanical Engineering Tsinghua University Beijing100084 China

In binder jetting additive manufacturing, such as Three Dimensional Printing (3DP) and Patternless Casting Manufacturing (PCM, a process similar as ExOne and VoxelJet), the building error is mainly caused by the infiltration by the binder in the powder bed, and appear heterogeneous magnitude along different orientations because of the different infiltrating depth of the printed binder between the building direction and the binder printing direction. Current methods to compensating these error are mostly based on the contour equidistant offset and the model shrinkage, which couldn't deal with the heterogeneous infiltrative error. In this paper, we will propose a novel compensation method, in which the STL model will be counteracted heterogeneously in different directions to compensate the heterogeneous infiltrative distances of the binder in the powder. By this method, a sphere STL model will be transferred into an ellipsoid with variant axis length along different X/Y/Z directions. The method could greatly improve the dimensional accuracy of a series of additive manufacturing techniques which are based on the binder jetting onto powder bed. © SFF *** rights reserved.

关键词： Additives

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：