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Simulation of Elastic and Fatigue Properties of Epoxy/SiO_(2) Particle Composites through Molecular Dynamics

Computer Modeling in Engineering & Sciences 2021年第7期128卷 339-357页

作者： Gaoge Zhao Jianzhong Chen Yong Lv Xiaoyu Zhang Li Huang Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of ScienceWuhan University of TechnologyWuhan430070China

The influence of different nanoparticle sizes on the elastic modulus and the fatigue properties of epoxy/SiO_(2) nanocomposite is studied in this ***,the cross-linked epoxy resins formed by the combination of DGEBA and 1,3-phenylenediamine are used as the matrix phase,and spherical SiO_(2) particles are used as the reinforcement *** order to simulate the elastic modulus and long-term performance of the composite material at room temperature,the simulated temperature is set to 298 K and the mass fraction of SiO_(2) particles is set to 28.9%.The applied strain rate is 109/s during the simulation of the elastic *** results show that the elastic modulus of the material increases with the increase in particle ***,fatigue simulation under strain control is performed on the model with SiO_(2) nanoparticle radius of 12˚*** results indicate that the influence trend of variable frequencies on the fatigue mechanical response is similar,and the mean stress decreases with the increase in number of *** addition,the smaller the loading period and the more the number of cycles,the greater the mean stress ***,the change in energy and free volume fraction are evaluated under fatigue loading condition.

关键词： SiO_(2)particle elastic modulus fatigue free volume molecular dynamics

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The Shock Response and Spall Mechanism of Mg-Al-Zn Alloy:Molecular Dynamics Study

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Acta Mechanica Solida Sinica 2022年第3期35卷 495-503页

作者： Xiaoyue Yang Shuang Xu Lisheng Liu Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Shock responses of Mg-Al-Zn alloy are investigated by the molecular dynamics(MD)*** wave propagation,plastic deformation behavior and failure mechanism along the[0001]and[1010]orientations are *** both orientations,simulation results show that the shock wave has an obvious double-wave structure(plastic-elastic)under a piston velocity of 1200 m/s.A higher Hugoniot elastic limit(HEL)is observed for[0001]-oriented *** the shock pressure is along the[1010]direction,the distance between plastic and elastic waves is closer,and higher dislocation density and more twins are ***,the spall strength for[1010]-oriented shock is predicted to be *** addition,the wave interactions,HEL and spall strength predicted for Mg-Al-Zn alloy are compared with the experimental results and MD simulation results of Mg single crystal in the *** is concluded that the shock performance of Mg-Al-Zn is better than that of Mg single crystal.

关键词： Mg-Al-Zn Shock compression Molecular dynamics Hugoniot elastic limit Spall strength

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Dense dislocations induced ductile SnTe thermoelectric semiconductor over a wide range of temperatures

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Journal of Materials Science & Technology 2023年第13期144卷 213-218页

作者： Houjiang Yang Xiege Huang Bo Duan Luoqi Wu Hongtao Wang Xiaobin Feng Maoyuan Jiang Guodong Li Ling Zhou Pengcheng Zhai Qingjie Zhang Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Most inorganic thermoelectric semiconductors are intrinsically brittle,restricting the application of ther-moelectric ***,developing ductile thermoelectric materials is crucial to thermoelectric technology *** this work,single-phase SnTe bulks with dense dislocations were prepared by melting quenching combined with spark plasma *** resulting SnTe thermoelectric materials exhibited a large compressive strain of∼7.5%at room temperature,originating from high-density pre-existing mobile *** initiation of localized slip bands and preferred slip system were also identified by first-principles *** microstructural characterizations reveal that the thermal activated dislocation emission and migration lead to higher compressive strains at intermediate *** 673 K,the deformation mechanism changed from dislocation mediated to grain boundary mediated plasticity,resulting in an ultra-high compressive strain of∼42%.In sum,new insights into the mechanical behavior of SnTe thermoelectric material over a wide range of temperatures were *** work offers the dislocation engineering strategy to design ductile thermoelectric materials for flexi-ble electronics and energy systems.

关键词： SnTe Ductile thermoelectric materials Deformation mechanism Dislocation engineering

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Simultaneous optimal control of directional missed discovery rates in data stream diagnosis

A I I E Transactions

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A I I E Transactions 2025年第4期57卷

作者： Yan He Yicheng Kang Dongdong Xiang Peihua Qiu a Key Laboratory of Advanced Theory and Application in Statistics and Data Science-MOE School of Statistics East China Normal University Shanghai China b Department of Information Systems & Analytics Miami University OxfordOH USA c Department of Biostatistics The University of Florida Gainsville FL USA

High-dimensional data streams are ubiquitous in modern manufacturing, due to their ability to provide valuable information about the industrial system’s performance on a real-time basis. If a shift occurs in a production process, fault diagnosis based on the data streams is of critical importance for identifying the root cause. Existing methods have largely focused on controlling the total missed discovery rate without distinguishing missed signals for positive versus negative components of the shift vector. In practice, however, losses incurred from the two directional shifts can differ substantially, so it is desirable to constrain the proportions of missed signals for positive and negative components at two distinctive levels. In this article, we propose a fault classification procedure that controls the two proportions separately. By formulating the problem as Lagrangian multiplier optimization, we show that the proposed procedure is optimal in the sense that it minimizes the expected number of false discoveries. We also suggest an iterative adjustment algorithm that converges to the optimal Lagrangian parameters. The asymptotic optimality for the data-driven version of our procedure is also established. Theoretical justification and numerical comparison with state-of-the-art methods show that the proposed procedure works well in applications.

关键词： Fault classification high-dimensional data large-scale testing Markov models post-signal diagnostics quality control

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Optimal mean-variance reinsurance and investment strategy with constraints in a non-Markovian regime-switching model

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Statistical theory and Related Fields 2020年第2期4卷 214-227页

作者： Liming Zhang Rongming Wang Jiaqin Wei Key Laboratory of Advanced Theory and Application in Statistics and Data Science-MOE School of StatisticsEast China Normal UniversityShanghaiPeoples Republic of China

This paper is devoted to study the proportional reinsurance/new business and investment problem under the mean-variance criterion in a continuous-time *** strategies are constrained in the non-negative cone and all coefficients in the model except the interest rate are stochastic processes adapted the filtration generated by a Markov *** the help of a backward stochastic differential equation driven by the Markov chain,we obtain the optimal strategy and optimal cost explicitly under this non-Markovian regime-switching *** cases with one risky asset and Markov regime-switching model are considered as special cases.

关键词： Markov chain mean-variance problem non-negative constraints BSDE regime-switching

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Effect of Composite Composition on the Contact Angle of B_(4)C-xTiB_(2)/Cu

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Journal of Wuhan University of Technology(Materials Science) 2024年第5期39卷 1116-1120页

作者： HU Dong ZHANG Xin ZHANG Jinyong LEI Liwen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics Wuhan University of TechnologyWuhan 430070China

The wetting behavior of molten Cu on the B_(4)C-xTiB_(2)ceramic composites was investigated in this *** results show that the contact angle of molten Cu alloy on B_(4)C-TiB_(2)ceramic composites is linear with the composition rate of TiB_(2)or B_(4)C while the temperature is in the range of 1300 to 1350℃,consistent with the expectation of the commonly used theoretical ***,a nonlinear relationship between the contact angle and the composition rate unexpectedly occurred at temperatures ranging from 1400 to 1500℃.The big difference of the contact angles between the molten metal and the components in the composites was found to be the key *** result identifies that the commonly used theoretical method only works at a limited difference of the contact angle of the liquid on the different phases in the composites,and fails at a big difference.

关键词： wetting B_(4)C-TiB_(2) composites interfacial reaction

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Origin of shear induced‘catching bonds’on half Heusler thermoelectric compounds XFeSb(X=Nb,Ta)and SnNiY(Y=Ti,Zr,Hf)

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npj Computational Materials 2024年第1期10卷 2607-2614页

作者： Haoqin Ma Xiege Huang Zhongtao Lu Xiaobin Feng Bo Duan Wenjuan Li Yinhan Liu Pengcheng Zhai Guodong Li Qingjie Zhang Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of ScienceWuhan University of Technology430070 WuhanChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology430070 WuhanChina

Half Heusler materials exhibit excellent thermoelectric and mechanical properties,rendering them potential candidates for advanced thermoelectric ***,the developments on interrelated devices are impeded by their inherent brittleness and limited ***,it exists the potential ductility on half Heusler materials with face-centered cubic sub-lattices through the expectation of the occurrence of shear-induced‘catching bonds’which can result in excellent ductility on other face-centered cubic materials.

关键词： ductility cubic rendering

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A hybrid deep learning method for finite-horizon mean-field game problems

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Automatica 2025年 179卷

作者： Yu Zhang Zhuo Jin Jiaqin Wei George Yin Key Laboratory of Advanced Theory and Application in Statistics and Data Science-MOE School of Statistics East China Normal University Shanghai 200062 China Department of Actuarial Studies and Business Analytics Macquarie University 2109 NSW Australia Department of Mathematics University of Connecticut Storrs CT 06269-1009 USA

This paper develops a new deep learning algorithm to solve a class of finite-horizon mean-field games. The proposed hybrid algorithm uses Markov chain approximation method combined with a stochastic approximation-based iterative deep learning algorithm. Under the framework of finite-horizon mean-field games, the induced measure and Monte-Carlo algorithm are adopted to establish the iterative mean-field interaction in Markov chain approximation method and deep learning, respectively. The Markov chain approximation method plays a key role in constructing the iterative algorithm and estimating an initial value of a neural network, whereas stochastic approximation is used to find accurate parameters in a bounded region. The convergence of the hybrid algorithm is proved; two numerical examples are provided to illustrate the results.

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A New Method for Computing the Expected Hitting Time between Arbitrary Different Configurations of the Multiple-Urn Ehrenfest Model

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数学研究 2022年第3期55卷 254-270页

作者： Sai Song Qiang Yao Key Laboratory of Advanced Theory and Application in Statistics and Data Science-MOE School of StatisticsEast China Normal UniversityShanghai 200062China Key Laboratory of Advanced Theory and Application in Statistics and Data Science-MOE School of StatisticsEast China Normal UniversityShanghai 200062China NYU-ECNU Institute of Mathematical Sciences at NYU Shanghai Shanghai 200062China

We study a multiple-urn version of the Ehrenfest *** this setting,we denote the n urns by Urn l to Urn n,where n≥***,M balls are randomly placed in the n *** each subsequent step,a ball is selected and put into the other n-1 urns with equal *** expected hitting time leading to a change of the M balls'status is computed using the method of stopping *** a corollary,we obtain the expected hitting time of moving all the M balls from Urn 1 to Urn 2.

关键词： Ehrenfest urn model Markov chain random walk hitting time

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Analysis of Stock Splits Based on Risk theory: Empirical Evidence from the Chinese Stock Markets

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Journal of Systems Science and Information 2022年第1期10卷 19-34页

作者： Shujin WU Tong XU MOE Key Laboratory of Advanced Theory and Application in Statistics and Data Science School of StatisticsEast China Normal UniversityShanghai 200062China School of Statistics East China Normal UniversityShanghai 200062China

The paper first analyzes price change due to stock splits in Chinese stock markets,which shows stock prices typically go up for stock *** theoretical analyses based on risk theory are presented to explain the reason,where the method comes from a new perspective and obtained theoretical conclusions show that stock splits typically make stock price go up if risk-compensation function is convex,and go down if risk-compensation function is *** prices typically go up for stock splits because risk-compensation functions are mainly *** obtained conclusions are consistent with the known results in the last three decades.

关键词： stock split risk theory price Chinese stock markets

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