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Journal of Traffic and Transportation Engineering 2017年第1期5卷 32-43页

作者： Sadok Turki Nidhal Rezg LGIPM Universite de Lorraine Ile du Saulcy 57045 Metz Cedex France

SOME STABILITY RESULTS FOR TIMOSHENKO SYSTEMS WITH COOPERATIVE FRICTIONAL ANd INFINITE-MEMORY dAMPINGS IN THE dISPLACEMENT

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Acta mathematica Scientia 2016年第1期36卷 1-33页

作者： Aissa GUESMIA Salim MESSA O UdI department of mathematics and Statistics College of Sciences King Fahd University of Petroleum and Minerals P.O. Box 5005 Dhahran 31261 Saudi Arabia Institut Elie cartan de Lorraine UMR 7502 Universitd de Lorraine Bat. A Ile du Saulcy 57045 Metz Cedex 01 France

In this paper, we consider a vibrating system of Timoshenko-type in a one- dimensional bounded domain with complementary frictional damping and infinite memory acting on the transversal displacement. We show that the dissipation generated by these two complementary controls guarantees the stability of the system in case of the equal-speed propagation as well as in the opposite case. We establish in each case a general decay estimate of the solutions. In the particular case when the wave propagation speeds are different and the frictional damping is linear, we give a relationship between the smoothness of the initiM data and the decay rate of the solutions. By the end of the paper, we discuss some applications to other Timoshenko-type systems.

关键词： well-posedness decay damping Timoshenko thermoelasticity

AN ITERATIVE BEM FOR THE INVERSE PROBLEM OF deTECTING CORROSION IN A PIPE

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Numerical mathematics A Journal of Chinese universities(English Series) 2005年第3期14卷 252-266页

作者：杨昕 Choulli Mourad 程晋 department of Computer Science and Engineering Penn. State University University Park PA 16802 USA département de mathématiques université de metz ile du saulcy 57045 metz cedex France School of mathematical Sciences Fudan University Shanghai 200433 PRC

In this paper, we consider an inverse problem of determining the corrosion occurring in an inaccessible interior part of a pipe from the measurements on the outer boundary. The problem is modelled by Laplace's equation with an unknown term γ in the boundary condition on the inner boundary. Based on the Maz'ya iterative algorithm, a regularized BEM method is proposed for obtaining approximate solutions for this inverse problem. The numerical results show that our method can be easily realized and is quite effective.

关键词：迭代算法反转问题侵蚀状态 Laplace方程边界条件

degradation and Mechanism of the Mechanics and durability of Reinforced Concrete Slab in A Marine Environment

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China Ocean Engineering 2016年第2期30卷 257-270页

作者：吴胜兴刘冠国卞汉兵吕维波蒋建华 College of Civil and Transportation Engineering Hohai UniversityNanjing 210098China Jiangsu Engineering Research Center for Cracking Control of Building Hohai UniversityNanjing 210098China Jiangsu Transportation Research Institute Co.Ltd. Nanjing 211112China Laboratoire LEM3(UMR CNRS 7239) Universite de LorraineIle du Saulcy57045 Metz Cedex 01France Nanjing City-Town Architecture design&Consultants Co.Ltd. Nanjing 210009China

An experimental research was conducted to determine the corrosion and bearing capacity of a reinforced concrete（RC） slab at different ages in a marine *** show that the development of corrosion-induced cracks on a slab in a marine environment can be divided into three stages according to crack morphology at the bottom of the *** the first stage,cracks *** the second stage,cracks develop from the edges to the middle of the *** the third stage,longitudinal and transverse corrosion-induced cracks *** corrosion ratio of reinforcements nonlinearly increases with the age,and the relationship between the corrosion ratio of the reinforcements and the corrosion-induced crack width of the concrete is *** flexural capacity of the corroded RC slab nonlinearly decreases with the age,and the model for the bearing capacity factor of the corroded RC slab is *** mid-span deflection of the corroded RC slab that corresponds to the yield of the reinforcements linearly increases with the increase in corrosion ***,the mechanisms of corrosion morphology and the degradation of the mechanical properties of an RC slab in a marine environment are discussed on the basis of the basic theories of steel corrosion in concrete and concrete structure design.

关键词： marine environment RC slab corrosion bearing capacity deflection

双态/近γ组织TiAl合金的变形机制图谱：构建及应用（英文）

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稀有金属材料与工程 2019年第11期48卷 3487-3493页

作者：程亮陈逸薛祥义寇宏超李金山 Bouzy Emmanuel 江苏理工学院材料工程学院江苏常州213001 江苏理工学院江苏常州213001 盛利维尔(中国)新材料技术有限公司江苏常州213000 西北工业大学凝固技术国家重点实验室陕西西安710072 LEM3 CNRS UMR 7239Universitéde LorraineIle du Saulcy57045 Metz Cedex 1France dAMAS Universitéde LorraineIle du Saulcy57045 Metz Cedex 1France

当金属材料承受应力时,某些独立或非独立的变形机制可同时被激活。对于变形动力学极其复杂的γ-Ti Al基合金,定量描述每个变形机制的一般性本构行为、预测指定加载条件下的主要变形机制具有非常重要的科学和实际意义。为此,本研究针对... 详细信息

当金属材料承受应力时,某些独立或非独立的变形机制可同时被激活。对于变形动力学极其复杂的γ-Ti Al基合金,定量描述每个变形机制的一般性本构行为、预测指定加载条件下的主要变形机制具有非常重要的科学和实际意义。为此,本研究针对具有双态/近γ组织的Ti Al合金,构建了同时考虑6种机制的变形机制图谱,并详细分析了其形貌特征,探讨了晶粒度的影响。研究表明,本研究所提出的变形机制图谱是理解Ti Al合金变形机制、预测变形动力学的有力工具。特别是该变形机制图谱可为Ti Al合金设计及变形工艺制定提供重要借鉴。

关键词： TiAl合金变形机制变形动力学位错蠕变晶界滑动扩散蠕变

HVOF喷涂成形纳米晶FeAl厚涂层的结构和热稳定性

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金属学报 2005年第6期41卷 561-567页

作者：嵇罡高泰瑞郝胜智廖汉林董闯 Laboratoire d'Etudes et de Recherches sur les Matériaux les Procédés et les Surfaces EA 3316Université de Technologie de Belfort-MontbéliardSite de Sevenans90010 Belfort CedexPrance Laboratoire de Métallurgie Physique et Génie des MatériauxUMR CNRS 8517Université des Sciences et Technologies de Lille et Ecole Nationale Supérieure de Chimie de LilleCité Scien-tifique59655 Villeneuve d'Ascq CedexPrance Laboratoire d'Etude des Textures et Application aux Matériaux UMR CNRS 7078 Université de MetzIle du Saulcy57045 Metz Cedex 01France 大连理工大学三束材料改性国家重点实验室 Laboratoire d'Etudes et de Recherches sur les Matériaux les Procédés et les Surfaces EA 3316Université de Technologie de Belfort-MontbéliardSite de Sevenans90010 Belfort CedexFrance

采用超音速火焰喷涂(HVOF)成形工艺喷涂球磨粉末,成功制备了纳米晶FeAl厚涂层(5mm).分别利用SEM、图像分析、TEM以及Vickers硬度表征了该涂层的微观结构,并与用相同的喷涂参数和原料粉末制备的纳米晶薄涂层(300μm)进行了比较,研究了不... 详细信息

采用超音速火焰喷涂(HVOF)成形工艺喷涂球磨粉末,成功制备了纳米晶FeAl厚涂层(5mm).分别利用SEM、图像分析、TEM以及Vickers硬度表征了该涂层的微观结构,并与用相同的喷涂参数和原料粉末制备的纳米晶薄涂层(300μm)进行了比较,研究了不同的喷涂条件对涂层的结构及其硬度的影响.同时,探讨了厚涂层的热稳定性.结果表明,由于涂层中较好地保留了未融粒子中的纳米晶,从而在600℃仍能保持原有的高硬度.

关键词： FeAl合金,纳米晶厚涂层喷涂成形超音速火焰喷涂

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用慢变傅立叶系数法研究失稳现象

固体力学学报 2010年第S1期31卷 120-127页

作者：余堃胡衡 N.damil M.Potier-Ferry 武汉大学土木建筑工程学院力学系 Laboratoire de Calcul Scientifique en Mécanique Facultédes Sciences Ben M'sikUniversité HassanⅡMohammedia-CasablancaSidi OthmanCasalbancaMorocco LEM3 CNRSUniversité Paul Verlaine-MetzIle du Saulcy57045 Metz Cedex 01France

本文通过分析非线性文克尔地基梁在压应力作用下发生屈曲褶皱现象时的失稳模式、临界载荷以及褶皱幅度等参数,深入研究了新近提出的慢变傅里叶系数法在解决具有近似周期性变化特性的稳定性问题时的计算效率及应用局限.

关键词：慢变傅里叶系数法屈曲褶皱宏观缩减模型边界效应