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Determination of Elastic and Creep Properties of Thin-film Systems from indentation Experiments

1973年

作者：竞技体操115个动作编写组

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Journal of Materials Science & Technology 2000年第6期16卷 559-567页

作者： Z.F.Yue and G.Eggeler (Institut fur Werkstoffe, Ruhr-Universitat Bochum, 44 801 Bochum, Germany) [Manuscript received February 16, 2000, in revised form April 12, 2000] Ruhr Univ Bochum Inst Werkstoffe D-44801 Bochum Germany

Based on the detailed computer simulation of the indentation testing on the thin-film systems, the present paper explores the detailed procedure of determining elastic properties (elastic modulusE^(f) and Poisson ratio v(f)) and creep parameters (CCREEP^(f) and nCREEP^(f)) for a simple Norton law (ε=CCREEP^(f)σ^n CREE^(f), where e is creep strain rate, and a is the stress) material for a thin film coated on a creep substrate, whose elastic properties(E^(s) and v^(s)) and creep properties (CCREEP^(s) and nCREEP^(s)) of the substrate are known, from indentation elastic and creep testing,respectively. The influences of the thickness of the thin-film and the size of the indenter on the indentation behavior have been discussed. It is shown that the boundary between the thin film and the substrate has great influence on the indentation creep behavior. The relative sizes of indentation systems are chosen so that the behavior of the indentation on the film is influenced by the substrate. The two elastic parameters E^(f) and v^(f) of the film are coupled on the influence of the elastic behavior of indentation. With the two different size indenters, the two elastic parameters E^(f) and v^(f) of the film can be uniquely determined by the indentation experimental slopes of depth to applied net section stress results. The procedure of determining of the two Norton law parameters CCREEP^(f) and nCREEP^(f) includes the following steps by the steady indentation rate d. The first step to calculate the creep indentation rate on certain loads of the two different sizes of indenters on a set of assumed values of CCREEP^(f) and nCREEP^(f)Then to build relationship between the creep indentation rate and the assumed CCREEP^(f) and nCREEP^(f) With the experimental creep indentation rate to intersect two sets of which have the same values of d. The last step is to build the CCREEP^(f) and nCREEP^(f)curves from the intersection points for the two indenters. These two curves CCREEP^(f) a

关键词： Thin Determination of Elastic and Creep Properties of Thin-film Systems from indentation Experiments

Concurrent Design Study of the Petroleum Equipment CAD System

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厦门大学学报（自然科学版） 2002年第S1期41卷 269-270页

作者： CHEN Yong-guang, CHEN Xu, WANG Jiang (Mechanical Engineering Institute, Chongqing University,Chongqing 4000 44, China)

Military petroleum equipment, as the special device a nd tool for petroleum storage, transportation, filling, chemical analysis, detec tion and maintenance for the army, is an important means and basis of petroleum indemnificatory. To adapt to modern war in high-tech conditions, the petroleum equipment have to develop towards higher reliability, adaptability, maneuverabil ity, standardization, container and cell type with versatile multi-functions. As a new design theory and design process, concurrent engineering may prod uce remarkable benefit when applying to product development. With the aid of the state-of-the-art modeling and simulation technology, it foresees the future or even the whole life cycle of the products designed. Based on wide statistics and survey, the product design period is reduced by 1/2～1/3 with concurrent des i gn process. The application of concurrent design process in new petroleum equi pment development shall greatly accelerate the petroleum equipment updating an d promote their indemnificatory.

关键词： petroleum equipment concurrent engineering CAD

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当神不让

How To DetermiHowToDetermine The Meaning Of Strange Words In Reading Comprehension

作者：临界44号刘北[]

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东华理工大学学报(社会科学版) 2000年第1期 57-60+102页

作者： HeShulin (EnglishDepartmentofFuzhouTeachersCollege ,LinchuanJiangxi 3 44 0 0 0 )

Moststudentswouldliketostoptolookupnewwordsinthedictionarywhentheyen contertheminreading ,whichwillaffecttheirguessingabilityandreadingspeed .Inthispaper , theauthorintroducesushowtodiscoverthemeaningsofstrangewordsth... 详细信息

关键词： readingcomprehension wordanalysis contextanalysis

长空任舞——Saitek X52猎鹰控制器赏析

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同方期刊数据库

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微型计算机 2005年第19期25卷 20-23页

作者： JV44-madin 田东（图）

作为一个普通人，也许我们一生中都不会有机会亲自驾驶飞行穿行于蓝天白云间，但这并不能阻止我们对天空的向往。拥有一款强劲的摇杆，在游戏的长空中任我翱翔。

关键词： Saitek X52猎鹰控制器游戏手柄体态扫描

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维普期刊数据库

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后唐枭雄录

ANISOTROPY OF (1×1)-SURFACE FREE ENERGIES OF CRYSTALS

作者：小红肠近卫队44号

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Acta Metallurgica Sinica(English Letters) 2001年第6期14卷 485-492页

作者： Z.M. Yu (Department of Materials Science and Engineering, Central South University, Changsha 410083, China) A. Flodstrom (Royal Institute of Technology, KTH, Office of the President, Valhallavdgen 79, S-100 44 Stockholm, Sweden) Dept. of Mat. Sci. and Eng. Central South Univ. Changsha 410083 China

The surface free energy (SFE) of (1× 1)-surfaces of crystals, without reconstructionand adsorption, is calculated using a bond-broken mode. In the mode, the potentialenergy of the crystals is treated as a sum of the energies of the bonds connectingpair-wise atoms (u-bonds). The SFE is calculated based on the bond energy and thearea density of dangling bonds which depends on the structure of the surface. Theresults provide a general expression for the SFE in terms of the bond energy (E)and the bond length (do) of the crystal and Miller indices hkl. The anisotropy ofthe SFE is therefore completely determined with the expression. As the examples,considering the nearest-neighboring bonding, the SFEs of sc, fcc, bcc and cth (cubictetrahedral) crystals are discussed, respectively. Wulff plots of bcc and fcc crystalsare then obtained. The equilibrium forms (EFs) of these crystals ave consequentlygot from their Wulff plots, respectively. It is found that the EFs of bcc and fcc arerespectively the rhombic dodecahedron and the truncated-octahedron that are their firstBrillouin zones, respectively.

关键词： surface free energy crystal geometrical thermodynamics

Bis（imidazolium） Ionic Liquid as Latent Carbene

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Bis（imidazolium） Ionic Liquid as Latent Carbene

WELDABILITY EVALUATION OF A MODERN TMCP STEEL BY USING SIMULATION TECHNIQUES

中国化学会第27届学术年会

作者： Ling-Kang Liu Institute of Chemistry, Academia Sinica, Nankang, Taipei 115

＜正＞Room-temperature ionic liquids （ILs） are composed of charged particles, with each cation immediately surrounded by anions and each anion by cations. In the past decades extensive

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Acta Metallurgica Sinica(English Letters) 2000年第1期13卷 103-111页

作者： J. Brizda and M. Zeman Instytut Spawalnictwa (Institute of Welding), ul. B1. Czesawa 16/18, 44 - 100 Gliwice, Poland

At the Institute of Welding in Gliwice a thermal - and stress - strain cycle simulator has been devel- oped, which is now used in research projects on weldability evaluation of steels. For the tested S460ML steel (40 mm in thickness) with a notch toughness of 280 J, the TTT diagram has been prepared. Thermal welding cycles with the peak temperature of 125℃ and cooling tinies t8/5 = 8÷300 s were simulated on (10 × 10 × 55) mm specimens and KV notch toughness, hardness and microstructure of the simulated HAZ's have been determined. It was found that cooling times t8/5 shorter than 60 s have no influence on the Charpy V notch toughness at room temperature. At lower test temperatures the KV values are much lower than those of the parent material. A pronounced fors of notch toughness has been noticed on simulated HAZ's treated by a second thermal cycle with the peak temperature between Acl- Ac3. Butt joints hare been MAG and submerged arc arc welded with the heat input between 12 and 35 kJ/ cm. Mechanical properties of the joints hare been determined as well as notch toughness and CTOD values for the HAZ,weld metal and parent material at room temperature and down to -75℃. A high brittle fracture resistance of the HAZ's was found at a wide temperature range for all heat inputs.

关键词： S460 ML steel Weldability,simulation mechanical property