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Quasimolecular Dynamic Simulation for Bending Fracture of Laminar Composite Materials

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Journal of Materials Science & Technology 2001年第5期17卷 547-552页

作者： youngsuk kim and Youngmoon Lee Department of Mechanical Engineering, Kyungpook National University, Taegu, South Korea Dongyoul Choi and Chanil kim Graduate School, Kyungpook National University, Taegu, South Korea Kyungpook Natl Univ Dept Mech Engn Taegu 702701 South Korea Kyungpook Natl Univ Grad Sch Taegu 702701 South Korea

Recently, quasimolecular dynamics has been successfully used to simulate the deformation characteristics of actual size solid materials. In quasimolecular dynamics, which is an attempt to bridge the gap between atomistic and continuum simulations, molecules are aggregated into large units, called quasimolecules, to evaluate large scale material behavior. In this paper, a 2-dimensional numerical simulation using quasimolecular dynamics was performed to investigate laminar composite material fractures and crack propagation behavior in the uniform bending of laminar composite materials. It was verified that under bending deformation laminar composite materials deform quite differently from homogeneous materials

关键词： Quasimolecular Dynamic Simulation for Bending Fracture of Laminar Composite Materials Simulation

Calculations of Forming Limit Diagrams for Changing Strain Paths on the Formability of Sheet Metal

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Journal of Materials Science & Technology 2001年第1期17卷 141-142页

作者： Hyunsung Sou Graduate School of Mechanical Eng., Kyungpook National University, Korea youngsuk kim Dept. of Mechanical Eng., Kyungpook National University, Korea Kyungpook Natl Univ Taegu 702701 South Korea Kyungpook Natl Univ Dept Mech Engn Taegu South Korea

In the press shop of most sheet metals, sheet material undergoes complex strain path and also the formability of the sheet material was limited by the stretchability of the material. Therefore, the precise prediction of path-dependent FLD based on M-K approach using generalization of Hill's 1979 anisotropic yield criterion and introducing a strain gradient effect in the constitutive equation. Also, the theoretically obtained FLD will be compared with experimental data for steel sheets.

关键词： Sheet Metal sheet material strain gradient effect constitutive equation experimental data yield criterion steel sheets strain path

Three-Dimensional Rigid-Plastic FEM Simulation of Bulk Forming Processes with New Contact and Remeshing Techniques

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Journal of Materials Science & Technology 2001年第3期17卷 329-332页

作者： Debin Shan and youngsuk kim School of Mechanical Engineering, Kyungpook National University, Taegu 702-70 1, South Korea Hyunsoo kim Graduate School of Mechanical Engineering, Kyungpook National University, Taegu 702-701, South Korea E-mail: shandb@public Kyungpook Natl Univ Sch Mech Engn Taegu 702701 South Korea Kyungpook Natl Univ Grad Sch Mech Engn Taegu 702701 South Korea

Some techniques such as die surface description, contact judgement algorithm and remeshing are proposed to improve the robustness of the numerical solution. Based on these techniques, a three-dimensional rigid-plastic FEM code has been developed. Isothermal forging process of a cylindrical housing has been simulated. The simulation results show that the given techniques and the FEM code are reasonable and feasible for three-dimensional bulk forming processes.

关键词： Three-Dimensional Rigid-Plastic FEM Simulation of Bulk Forming Processes with New Contact and Remeshing Techniques FEM Simulation

Molecular Dynamic Simulation for Mechanical Nano Lithography Using Diamond Tool

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Molecular Dynamic Simulation for Mechanical Nano Lithography...

Molecular Dynamic Studies on Mechanical Properties of Poly crystalline Metal in Nano Indentation

The Fourth International Conference on Physical and Numerical Simulation of Materials Processing (ICPNS’2004)

作者： Chanil kim youngsuk kim Junyoung Park Department of Mechanical Engineering Kyungpook National University Department of Mechanical Engineering Kyungpook National University Department of Mechanical Engineering Kyungpook National University

The atomic force microscopy (AFM)-based nano lithographic technique is currently used to directly machine material surfaces and fabricate nano components for MEMS device. In the current study, three-dimensional molecular dynamic (MD) simulations with potentials based on the Morse function were performed to evaluate the effect of crystallographic factors and process variables on the nano deformation characteristics of the nano lithography process of monocrystalline copper. Moreover, the effects of process variables (the tool shape, cutting speed and undeformed chip thickness) on the nano structural pattern are investigated. The simulation results revealed that the crystal orientation and ploughing direction had a significant influence on varying the forces (cutting force, thrust force, and width-direction force) as well as the nature of the nano deformation ahead of the tool and surface quality of the machined material

关键词： Molecular dynamic simulation Mechanical nano lithography

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Molecular Dynamic Studies on Mechanical Properties of Poly c...

CANDU重水堆Zr-2.5Nb压力管氢致延迟开裂行为研究

The Fourth International Conference on Physical and Numerical Simulation of Materials (ICPNS’2004)

作者： Junwon Park youngsuk kim Seogou Choi

＜正＞The objective of this study is the use of MD simulation to evaluate the effect of grain size on nanoindentation properties. The Morse potential is employed to model the interatomic forces between atoms. Young’s modulus and the hardness of the workmaterials are evaluated from load-depth curve obtained in indentation simulation. The relationship between temperature and the mechanical properties, and the influence of grain size on the yield behaviors of metal have been studied by applying to the Hall-Petch relation. MD simulation results are compared with several models results for load-depth curve and hardness. Finally, this simulation results are compared with the experimental data obtained from the literatures

关键词： Nano indentation Polycrystalline Molecular Dynamic

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CANDU重水堆Zr-2.5Nb压力管氢致延迟开裂行为研究

朝鲜王朝后期参考中国古代文献创作的呈才文献考

第十五届全国疲劳与断裂学术会议

作者：孙超应诗浩 youngsuk kim 中国核动力院反应堆燃料及材料重点实验室韩国原子能研究院(KAERI)核材料部

＜正＞1.前言锆合金由于具有低的热中子吸收截面、优异的耐高温高压水腐蚀性能、良好的综合力学性能和较高的导热性能,被广泛用作核反应堆燃料元件的包壳材料。由于锆合金具有较强的吸氢性能,在反应堆运行过程中,锆合金与高温、高压水... 详细信息

＜正＞1.前言锆合金由于具有低的热中子吸收截面、优异的耐高温高压水腐蚀性能、良好的综合力学性能和较高的导热性能,被广泛用作核反应堆燃料元件的包壳材料。由于锆合金具有较强的吸氢性能,在反应堆运行过程中,锆合金与高温、高压水或过热水蒸气发生反应,生成氧化膜的同时产生氢气,

关键词：锆合金 CANDU重水堆包壳材料开裂行为

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当代舞蹈艺术研究 2020年第1期5卷 28-32页

作者： [韩]金英淑韩国呈才研究会韩国雅乐佾舞保存会

韩国的宫廷舞蹈,又名呈才,有唐乐呈才与乡乐呈才之分。传承至朝鲜王朝后期的呈才共53种,其中纯祖时期孝明世子提议创作、改编了4种唐乐呈才和18种乡乐呈才,部分与中国古代文献中的作品名称相同。本文从呈才发展的历史切入,参考戊子《进... 详细信息

韩国的宫廷舞蹈,又名呈才,有唐乐呈才与乡乐呈才之分。传承至朝鲜王朝后期的呈才共53种,其中纯祖时期孝明世子提议创作、改编了4种唐乐呈才和18种乡乐呈才,部分与中国古代文献中的作品名称相同。本文从呈才发展的历史切入,参考戊子《进爵仪轨》、己丑《进馔仪轨》等仪轨,探讨纯祖时期呈才的创作背景,提出那些与中国古代文献记载的作品同名的呈才并非来自中国,而是朝鲜王朝参考《古今图书集成》《渊鉴类函》《佩文韵府》等中国古代文献创作的。

关键词：朝鲜王朝后期呈才中国古代文献创作孝明世子