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原位TiB_(2)增强铝基复合材料的时效行为及性能演变

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特种铸造及有色合金 2024年第1期44卷 111-115页

作者：陆仕平朱训明刘建平胡成博吴树森浙江万丰摩轮有限公司新昌312500 华中科技大学材料科学与工程学院材料成形与模具技术全国重点实验室武汉430074

通过对比原位TiB_(2)颗粒增强铝基复合材料和基体合金的时效行为,研究了TiB_(2)颗粒对时效行为的影响以及颗粒促进时效沉淀的机制。此外,还研究了时效过程中TiB_(2)/Al-4.5Cu复合材料和基体合金的拉伸性能和硬度的变化。结果表明,TiB_(2... 详细信息

通过对比原位TiB_(2)颗粒增强铝基复合材料和基体合金的时效行为,研究了TiB_(2)颗粒对时效行为的影响以及颗粒促进时效沉淀的机制。此外,还研究了时效过程中TiB_(2)/Al-4.5Cu复合材料和基体合金的拉伸性能和硬度的变化。结果表明,TiB_(2)颗粒加速了复合材料的时效过程,同时TiB_(2)颗粒附近的高密度位错导致了Al_(2)Cu相的不均匀析出。相较于基体合金,TiB_(2)/Al-4.5Cu复合材料的峰时效时间由20 h缩短至8 h。复合材料力学性能随时效时间的变化可以分为2个阶段,这与Al_(2)Cu析出相的变化具有良好的一致性。复合材料的屈服强度比时效前提高了24%,比时效的基体合金提高了82%。

关键词：金属基复合材料时效行为 TiB_(2)颗粒 Al_(2)Cu析出相力学性能

基于全生命周期评价的镁合金后掀背门碳足迹研究

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铸造工程 2024年第2期48卷 53-56页

作者：童胜坤赵开发梁会会陆仕平陈龙万丰镁瑞丁新材料科技有限公司浙江新昌312500 中国第一汽车股份有限公司研发总院吉林长春130000

通过采用全生命周期碳足迹定量核算分析方法,对同款车型镁合金与碳钢后掀背门的全生命周期碳足迹分别进行研究和对比分析。结果表明:在使用非绿色材料时,镁合金后掀背门全生命周期的碳足迹同传统碳钢的数量相当;当使用绿色材料时,镁合... 详细信息

通过采用全生命周期碳足迹定量核算分析方法,对同款车型镁合金与碳钢后掀背门的全生命周期碳足迹分别进行研究和对比分析。结果表明:在使用非绿色材料时,镁合金后掀背门全生命周期的碳足迹同传统碳钢的数量相当;当使用绿色材料时,镁合金后掀背门全生命周期的碳足迹仅占碳钢的70%。

关键词：镁合金后掀背门全生命周期碳排放碳足迹绿色材料

A Deep Learning-Enabled Skin-Inspired Pressure Sensor for Complicated Recognition Tasks with Ultralong Life

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Research 2024年第1期2023卷 443-454页

作者： Yingxi Xie Xiaohua Wu Xiangbao Huang Qinghua Liang shiping Deng Zeji Wu Yunpeng Yao Longsheng lu School of Mechanical&Automotive Engineering South China University of TechnologyGuangzhouChina

Flexible full-textile pressure sensor is able to integrate with clothing directly,which has drawn extensive attention from scholars *** the realization of flexible full-textile pressure sensor with high sensitivity,wide detection range,and long working life remains *** recognition tasks necessitate intricate sensor arrays that require extensive data processing and are susceptible to *** human skin is capable of interpreting tactile signals,such as sliding,by encoding pressure changes and performing complex perceptual *** by the skin,we have developed a simple dip-and-dry approach to fabricate a full-textile pressure sensor with signal transmission layers,protective layers,and sensing *** sensor achieves high sensitivity(2.16 kPa^(−1)),ultrawide detection range(0 to 155.485 kPa),impressive mechanical stability of 1 million loading/unloading cycles without fatigue,and low material *** signal transmission layers that collect local signals enable real-world complicated task recognition through one single *** developed an artificial Internet of Things system utilizing a single sensor,which successfully achieved high accuracy in 4 tasks,including handwriting digit recognition and human activity *** results demonstrate that skin-inspired full-textile sensor paves a promising route toward the development of electronic textiles with important potential in real-world applications,including human–machine interaction and human activity detection.

关键词： Deep Skin utilizing

Effect of Pressure on Boundary Slip of Thin Film lubrication Using Atomistic Simulation

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Journal of Wuhan University of Technology(Materials Science) 2020年第1期35卷 47-52页

作者：潘伶 ZHANG Hao lu shiping CHEN Youhong School of Mechanical Engineering and Automation Fuzhou UniversityFuzhou 350108China

Mechanical systems on all length scales may be subjected to nanoscale thin film lubrication(TFL). Molecular dynamics(MD) simulations were conducted to investigate the lubrication mechanism and boundary slip of squalane confined in nanogap at 293 K with two different film thicknesses and a wide range of pressures. The molecular distribution, density and velocity profiles of squalane were analyzed. The results show that the lubricant atoms tend to form layers parallel to the wall, but the lubricant molecules orient randomly throughout the film in the directions both parallel and perpendicular to the wall. Most squalane molecules appear twisted and folded, and extend to several atomic layers so that there are no slips between lubricant layers. The distances between the lubricant layers are irregular rather than broadening far away from the walls. The boundary slip at the interface of bcc Fe(001) and squalane only occurs at high pressure because of the strong nonbond interactions between lubricant atoms and wall atoms. The tendency of boundary slip is more obvious for films with thinner film thickness. According to the simulations, the relationship between the slip length and the pressure is given.

关键词： boundary slip thin film lubrication lubrication mechanism molecular dynamics simulation squalane

Effects of surface nanostructure on boundary lubrication using molecular dynamics

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Nanotechnology and Precision Engineering 2021年第3期4卷 54-62页

作者： Ling Pan Hui Yu shiping lu Guobin Lin School of Mechanical Engineering and Automation Fuzhou UniversityFuzhou 350116China

Molecular dynamics simulations are used to study the boundary lubrication behaviors of squalane lubricant between two iron wall structures during shearing at different pressures and *** lubrication models with a smooth iron wall and a nanostructured iron wall,respectively,are constructed,and the density distribution of the lubricating film and the velocity distribution in the shearing process are *** mechanical response of the solid wall is output,and the friction coefficient is calculated.A tribological test is performed with a UMT-2 tribometer under sliding conditions to evaluate the reliability of the simulation *** results show that the surface nanostructure has a significant effect on the film thickness and delamination of the lubricating film but little effect on the velocity distribution of the lubricating *** nano strip groove helps to reduce the friction coefficient of the boundary lubrication system.

关键词： Boundary lubrication Rough surface Molecular dynamics lubricating film Friction coefficient

Homoclinic Solutions for a Class of Prescribed Mean Curvature Equation with a Deviating Argument

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Journal of Mathematical Research with Applications 2014年第4期34卷 481-491页

作者： shiping lu Zaitao LIANG College of Mathematics and Statistics Nanjing University of Information Science and TechnologyJiangsu 210044P. R. China Department of Mathematics Anhui Normal UniversityAnhui 241000P. R. China

In this paper, by using Mawhin’s continuation theorem and some analysis methods,the existence of a set with 2kT-periodic solutions for a kind of prescribed mean curvature equation with a deviating argument is studied... 详细信息

关键词： homoclinic solution Mawhin’s continuation theorem prescribed mean curvature equation.

Hierarchical Self-assembly of Atomically Precise Au Nanoclusters with Molecular Rotor-based Ligands

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Chemical Research in Chinese Universities 2024年第4期40卷 670-674页

作者： WANG Guanzhong lu Hui LI Jiang WANG Lihua ZHU Ying SONG shiping GE Zhilei LI Qian CHEN Jing FAN Chunhai Division of Physical Biology Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai201800P.R.China University of Chinese Academy of Sciences Beijing100049P.R.China Zhangjiang Laboratory Shanghai201210P.R.China Institute of Materiobiology Department of ChemistryCollege of SciencesShanghai UniversityShanghai200444P.R.China School of Chemistry and Chemical Engineering New Cornerstone Science LaboratoryFrontiers Science Center for Transformative MoleculesZhangjiang Institute for Advanced Study and National Center for Translational MedicineShanghai Jiao Tong UniversityShanghai200240P.R.China

The hierarchical assemblies of precise nanoparticles(NPs)have created materials with emergent properties and ***,the complex assemblies remain unclear at a precise ***,we show the hierarchical self-assembly of atomically precise gold nanoclusters(Au NCs)with molecular rotor-based ligands(MRL),featuring a double-layer *** to two other types of monolayer-protected(MLP)Au NCs,the significantly reduced surface density for MRL Au NCs profoundly influences their assembly behavior within the ***,the long length of rotor-based ligands and the rotational freedom of the phenyl-rings of rotor-based ligands also facilitate the assembly of *** works elucidate the hierarchical assembly on a precise scale,suggesting that the rotor-based ligand’s strategy offers promising potential for designing well-defined and more complex structures in supercrystals.

关键词： Gold nanocluster Molecular rotor Hierarchical assembly Double-layer surface

PERIODIC SOluTION FOR p-LAPLACIAN DIFFERENTIAL EQUATION WITH A DEVIATING ARGUMENT

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Annals of Differential Equations 2007年第1期23卷 119-126页

作者： Zhu Yanling lu shiping Dept. of Statistics and Applied Math. Anhui University of Finance and Economics Bengbu 233000 Anhui Dept. of Math. Anhui Normal University Wuhu 241000 Anhui

By using the theory of coincidence degree, we study a kind of periodic solution to p-Laplacian differential equation with a deviating argument such as （φp（x＇（t）））＇＋ f（x（t））＋ g（x（t - τ（t））） = e... 详细信息

关键词： deviating argument periodic solution theory of coincidence degree

纳米SiO_(2)-硅烷协同改性对玄武岩纤维/环氧树脂复合材料力学性能及蠕变性能的影响

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复合材料学报 2022年第8期39卷 3723-3732页

作者：别依诺朱四荣贺攀陆士平武汉理工大学新材料力学理论与应用湖北省重点实验室武汉430070 四川航天拓鑫玄武岩实业有限公司成都610199 上海富晨化工有限公司GB51160国家标准管理组上海200241

分别采用硅烷偶联剂和纳米SiO_(2)粒子-硅烷偶联剂对玄武岩纤维(BF)进行表面改性,通过缠绕成型工艺制备了玄武岩纤维/环氧树脂(BF/EP)复合材料。采用万能材料试验机测定了BF的拉伸性能和BF/EP复合材料的弯曲性能,借助FESEM观察了纤维表... 详细信息

分别采用硅烷偶联剂和纳米SiO_(2)粒子-硅烷偶联剂对玄武岩纤维(BF)进行表面改性,通过缠绕成型工艺制备了玄武岩纤维/环氧树脂(BF/EP)复合材料。采用万能材料试验机测定了BF的拉伸性能和BF/EP复合材料的弯曲性能,借助FESEM观察了纤维表面及其复合材料弯曲断裂断口的形貌,自制三点弯曲蠕变测试装置测定了BF/EP复合材料2544 h的长期蠕变性能,采用万能材料试验机在不同应力水平下测定了BF/EP复合材料6000 s的短时蠕变性能,并分析了纤维表面改性对各项力学性能的影响。结果表明,在BF上浆剂中引入纳米SiO_(2)粒子后,纤维的拉伸性能、BF/EP复合材料的弯曲性能均得到有效改善。FESEM形貌显示BF的协同改性提高了纤维与树脂界面的粘结性能;2544 h的低应力长期蠕变实验及6000 s的不同应力水平短时蠕变实验中,均表现出蠕变柔量及其增长速率的显著降低;在20%、30%、40%及50%初始弯曲强度加载时的短时蠕变实验中,由蠕变曲线重合的应力值,可大致得到材料线性蠕变的应力阈值。使用Hooke-Kelvin-Kelvin(HKK)模型可有效描述BF/EP复合材料在低应力水平下的长期蠕变性能,由此可进行其蠕变性能指标的长期预测。

关键词：表面改性纳米SiO_(2) 玄武岩纤维/环氧树脂复合材料蠕变应力水平