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CCASt“散裂中子源多学科应用”研讨会

作者： t.d.lee

＜正＞the China Center of Advanced Science and technology （CCASt） was established on October 17, 1986 through the strong support of World Laboratory and the Chinese Government. Its purpose is to introduce important frontier areas of science to China, to foster their growth by providing a suitable environment, and to promote free exchange of scientific information between China and other nations.

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CCASt“黄土高原生态环境治理”研讨会

作者： t.d.lee

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CCASt“原始农业对中华文明形成的影响”研讨会

作者： t.d.lee

the China Center of Advanced Science and technology(CCASt)was established on October 17,1986 through the strong support ofWorld Laboratory and the Chinese *** purpose is tointroduce important frontier areas of science to China,to foster theirgrowth by providing a suitable environment,and to promote free exchange of scientific information between China and other nations.

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CCASt“放射性核束物理”研讨会

作者： t.d.lee

＜正＞the China Center of Advanced Science and technology（CCASt）was established on October 17,1986 through the strong support ofWorld Laboratory and the Chinese *** purpose is tointroduce important frontier areas of science to China,to foster theirgrowth by providing a suitable environment,and to promote free ex-change of scientific information between China and other nations.

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Preflace to the CCASt-World Laboratory Series

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Preflace to the CCAST-World Laboratory Series

自旋电子学研讨会

作者： t.d.lee the CCASt international symposium/workshop series is published separately by Gordon and Breach Scientific Publishers.

the China Center of Advanced Science and technology(CCASt)was established on October 17,1986 through the strong support ofWorld Laboratory and the Chinese *** purpose is tointroduce important frontier areas of science to China,to foster theirgrowth by providing a suitable environment,and to promote free ex-change of scientific information between China and other nations.

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CCASt“第二届粒子物理、核物理及宇宙学前沿问题”研讨会

作者： t.d.lee

the China Center of Advanced Science and technology (CCASt) was established on October 17, 1986 through the strong support of World Laboratory and the Chinese Government. Its purpose is to introduce important frontier areas of science to China, to foster their growth by providing a suitable environment, and to promote free exchange of scientific information between China and other nations.

关键词： Preface to the CCASt-World Laboratory Series

Generalized polynomial chaos expansion by reanalysis using static condensation based on substructuring

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Superplasticity of fine-grained Mg-10Li alloy prepared by severe plastic deformation and understanding its deformation mechanisms

Applied Mathematics and Mechanics(English Edition) 2024年第5期45卷 819-836页

作者： d.lee S.CHANG J.lee department of Automotive Engineering Hanyang UniversitySeoul 04763Republic of Korea School of Mechanical Engineering Chungnam National UniversityDaejeon 34134Republic of Korea department of Mechanical Robotics and Energy EngineeringDongguk UniversitySeoul 04620Republic of Korea

this paper presents a new computational method for forward uncertainty quantification(UQ)analyses on large-scale structural systems in the presence of arbitrary and dependent random *** method consists of a generalized polynomial chaos expansion(GPCE)for statistical moment and reliability analyses associated with the stochastic output and a static reanalysis method to generate the input-output data *** the reanalysis,we employ substructuring for a structure to isolate its local regions that vary due to random *** allows for avoiding repeated computations of invariant substructures while generating the input-output data *** substructuring with static condensation further improves the computational efficiency of the reanalysis without losing ***,the GPCE with the static reanalysis method can achieve significant computational saving,thus mitigating the curse of dimensionality to some degree for UQ under high-dimensional *** numerical results obtained from a simple structure indicate that the proposed method for UQ produces accurate solutions more efficiently than the GPCE using full finite element analyses(FEAs).We also demonstrate the efficiency and scalability of the proposed method by executing UQ for a large-scale wing-box structure under ten-dimensional(all-dependent)random inputs.

关键词： forward uncertainty quantification(UQ) generalized polynomial chaos expansion(GPCE) static reanalysis method static condensation substructuring

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Chebyshev polynomial-based Ritz method for thermal buckling and free vibration behaviors of metal foam beams

Journal of Magnesium and Alloys 2024年第1期12卷 316-331页

作者： H.t.Jeong S.W.lee W.J.Kim department of Materials Science and Engineering Hongik UniversityMapo-guSangsu-dong 72-1Seoul 121-791Republic of Korea

the superplastic behavior and associated deformation mechanisms of a fine-grained Mg-10.1 Li-0.8Al-0.6Zn alloy(LAZ1011)with a grain size of 3.2μm,primarily composed of the BCCβphase and a small amount of the HCPαphase,were examined in a temperature range of 473 K to 623 *** microstructural refinement of this alloy was achieved by employing high-ratio differential speed *** best superplasticity was achieved at 523 K and at strain rates of 10^(-4)-5×10^(-4)s^(-1),where tensile elongations of 550±600%were *** the heating and holding stage of the tensile samples prior to tensile loading,a significant increase in grain size was observed at temperatures above 573 ***,it was important to consider this effect when analyzing and understanding the superplastic deformation behavior and *** the investigated strain rate range,the superplastic flow at low strain rates was governed by lattice diffusion-controlled grain boundary sliding,while at high strain rates,lattice diffusion-controlled dislocation climb creep was the rate-controlling deformation *** was concluded that solute drag creep is unlikely to *** the late stages of deformation at 523 K,it was observed that grain boundary sliding led to the agglomeration of theαphase,resulting in significant strain *** mechanism maps were constructed forβ-Mg-Li alloys in the form of 2d and 3d formats as a function of strain rate,stress,temperature,and grain size,using the constitutive equations for various deformation mechanisms derived based on the data of the current tests.

关键词： Magnesium-lithium alloy Superplasticity Severe plastic deformation Grain size Grain growth

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