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Achieving ultra-high mechanical properties in metastable Co-free medium entropy alloy via hierarchically heterogeneous microstructure

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Journal of Materials Science & Technology 2024年第16期183卷 175-183页

作者： Qiuyu Gao Xinghua Zhang shilin feng Zhenhua Han Chen Chen Tan Wang Shaojie Wu Yongfu Cai Fushan Li Ran Wei School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China

A new metastable dual-phase Fe59 Cr13 Ni18 Al10 medium entropy alloy(MEA)with hierarchically heteroge-neous microstructure from micro-to nano-scale was designed in this *** recrystallized FCC phase and lots of NiAl-rich B2 precipitates are obtained by annealing and aging *** yield strength of the MEA at room temperature(298 K)and liquid nitrogen temperature(77 K)increased from∼910 MPa and∼1250 MPa in the annealed state,respectively,to∼1145 MPa and∼1520 MPa in the aged state,while the uniform elongation maintained more than 15%.The excellent mechanical properties of the MEA both at 298 and 77 K are attributed to the co-activation of multiple strengthening mech-anisms,including fine grain,dislocation,precipitation,transformation-induced plasticity,stacking faults,and nano-twins.

关键词： Medium entropy alloy Precipitation strengthening Heterogeneous microstructure Transformation-induced plasticity Mechanical properties

Parameter Identification of Magic Formula Tire Model Based on Fibonacci Tree Optimization Algorithm

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Journal of Shanghai Jiaotong university(Science) 2021年第5期26卷 647-657页

作者： feng shilin ZHAO Youqun DENG Huifan WANG Qiuwei CHEN Tingting College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Department of IEOR University of CaliforniaBerkeleyBerkeleyCA 94720USA

The magic formula(MF)tire model is a semi-empirical tire model that can precisely simulate tire *** heuristic optimization algorithm is typically used for parameter identification of the MF tire *** avoid the defect of the traditional heuristic optimization algorithm that can easily fall into the local optimum,a parameter identification method based on the Fibonacci tree optimization(FTO)algorithm is proposed,which is used to identify the parameters of the MF tire *** proposed method establishes the basic structure of the Fibonacci tree alternately through global and local searches and completes optimization *** global search rule in the original FTO was modified to improve its *** results of independent repeated experiments on two typical multimodal function optimizations and the parameter identification results showed that FTO was not sensitive to the initial *** addition,it had a better global optimization performance than genetic algorithm(GA)and particle swarm optimization(PSO).The root mean square error values optimized with FTO were 5.09%,10.22%,and 3.98%less than the GA,and 6.04%,4.47%,and 16.42%less than the PSO in pure lateral and longitudinal forces,and pure aligning torque parameter *** parameter identification method based on FTO was found to be effective.

关键词： magic formula tire model parameter identification Fibonacci tree optimization(FTO)algorithm

基于AMESim的某型运输机地面扰流板内漏故障研究

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机床与液压 2017年第22期45卷 190-193,198页

作者：丰世林中国民航飞行学院航空工程学院四川广汉618307

液压系统内漏是航空维护比较麻烦的问题,影响因素多,排故复杂,所需时间比较长。利用AMESim软件对某型运输机地面扰流板内漏进行故障仿真,分析出该型运输机地面扰流板常见的故障类型大都与液压相关;利用AMESim软件进行液压仿真建模,分析... 详细信息

液压系统内漏是航空维护比较麻烦的问题,影响因素多,排故复杂,所需时间比较长。利用AMESim软件对某型运输机地面扰流板内漏进行故障仿真,分析出该型运输机地面扰流板常见的故障类型大都与液压相关;利用AMESim软件进行液压仿真建模,分析扰流板作动筒在不同内漏间隙、不同负载和不同液压压力下的内漏情况。文中研究可为机务维护人员在维护飞机时提供参考。

关键词：地面扰流板 AMESim软件作动筒内漏

KINETICS OF THE ZIEGLER-NATTA POLYMERIZATION OF 1-OCTENE(I)----THE KINETICS OF THE STATIONARY PERIOD

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Chemical Research in Chinese Universities 1986年第2期 101-104页

作者： Yang shilin,Fan Zhiqiang and feng Linxian(Department of Chemistry,Zhejiang University,Hangzhou)

The kinetics of the Ziegler-Natta polymerization of C6;20 α-defines has been seldom studied,which showed no apparent differences from the kinetics of the polymerization of ethylene and propylene.1-Octene polymerizes in alkanes in a solution state,differing from the slurry polymerization of *** have found and studied the inordinary kinetics of the polymerization of 1-octene on α-TiCl3-AlEt3[or-Al（i-Bu）3,-AlEt2Cl] catalysts in n-heptane,and have given a primary explanation to this phenomenon.

关键词： TIC THE KINETICS OF THE STATIONARY PERIOD KINETICS OF THE ZIEGLER-NATTA POLYMERIZATION OF 1-OCTENE AI

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正熵系统的稳定集

中国科学：数学 2017年第1期47卷 21-36页

作者：冯世林高睿黄文四川大学数学学院成都610065 中国科学技术大学数学科学学院合肥230026

本综述将讨论正熵系统的稳定集研究的一些新的进展,主要侧重于稳定集与混沌的关联、稳定集的熵和维数等相关的一些主题.特别地,本文对符号系统的稳定集给出了其Hausdorff维数的下界估计.本文的目的是简介相关的一些进展,给出相应的参考... 详细信息

本综述将讨论正熵系统的稳定集研究的一些新的进展,主要侧重于稳定集与混沌的关联、稳定集的熵和维数等相关的一些主题.特别地,本文对符号系统的稳定集给出了其Hausdorff维数的下界估计.本文的目的是简介相关的一些进展,给出相应的参考文献,并提出几个未解决的问题.

关键词：熵稳定集混沌 Hausdorff维数

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伪刚体-柔体耦合的新式免充气轮胎刚度分析

中国机械工程 2021年第9期32卷 1051-1060,1072页

作者：张陈曦赵又群冯世林郑鑫徐瀚南京航空航天大学能源与动力学院南京210016

针对一种新式伪刚性免充气轮胎的结构特点,建立了一种分析其径向刚度特性的伪刚体柔体耦合模型。将伪刚体理论得到的轮胎板簧位移方程和弹性力学得到的輮轮形变方程进行耦合,解得轮胎的下沉量与变形情况。结果表明:伪刚性免充气轮胎的... 详细信息

针对一种新式伪刚性免充气轮胎的结构特点,建立了一种分析其径向刚度特性的伪刚体柔体耦合模型。将伪刚体理论得到的轮胎板簧位移方程和弹性力学得到的輮轮形变方程进行耦合,解得轮胎的下沉量与变形情况。结果表明:伪刚性免充气轮胎的下沉量与载荷成正比,其径向刚度比一般普通充气/非充气轮胎大,低车速时平顺性好,高车速时平顺性稍有欠缺。为验证所提模型,比较了同种边界条件下的有限元解,两者的结果很接近,且伪刚体-柔体耦合模型计算时间较短。利用所提模型对伪刚性免充气轮胎的径向刚度进行优化,得到了所需的设计尺寸参数。

关键词：免充气轮胎径向刚度伪刚体建模弹性力学半逆解法刚柔耦合