Scale Dependence of Mechanical Properties and Forming Limit in Thin Plates and Foils

薄板和箔材机械性能和成形极限的尺度依赖性

基本信息

批准号：
15360053
负责人：
IMATANI Shoji
金额：
$ 5.06万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

Micron scale materials reveal different aspect from macro-scale materials in view of their mechanical properties and forming limit. In order to establish a rational constitutive model taking account of the scale dependence and microscopic phenomena, tensile properties of foils are examined. Overall results obtained through the project are as follows :1.Settine of tensile tests :The optimal shape of tensile test specimen is established. Using a micro-servo testing apparatus and the finite element analysis, five kinds of shapes are examined for electrodeposited copper foils with the thickness of about 10 μm, such that uniform deformation can be obtained for a finite domain within the gauge length.2.Thickness dependence of foils:Two kinds of test materials are employed; electrodeposited copper foils and rolled aluminum foils. The copper foils show high deformation resistance while the ductility decreases. In contrast both the resistance and the ductility decrease in thinner aluminum foils. This difference may arise from the production process of the foils in the way that the deposition process in copper does not provide any prior deformation while the plastic deformation has an influence on the subsequent stretching in the rolled aluminum foils.3.Localized neck in tension :Almost no ductile property is observed for both materials in this study. This diminish in ductility may arise from the scale effect in the shape of specimen, so that localized neck is furnished rather than diffusive neck, and the different mechanism acts on the deformation mode.It follows that we further examine the correlation between the macroscopic material parameters and the deformation behavior, the bifurcation from diffuse neck to localized neck, and the material anisotropy in thickness direction. From this point of view, it is desired to establish the integrated material test scheme by use of numerical simulation technique.

鉴于其机械性能和形成限制的宏观材料与宏观尺度材料不同。建立了拉伸试样的最佳形状，并在有限的元素分析中检查了五种形状的塑形，用于用类似的电沉积铜箔。长度为2.2.2.2.2.2.2.2.2.2.2。相反，铜傻瓜的铜含量很高植物的过程以铜中的沉积过程不提供任何Pro变形，而塑性变形对滚动的铝箔有影响。3。张力的颈部紧张局部：几乎是Nost Nost Nost Nost Nost Nost Nost Nost Nost Nost Nost Nost Nost nost nost nost nost nost nost nost nost nost nost nost nost nost nost nost nost wor在这项研究中，这种污染性的含量可能是标本的形状，因此从材料参数和厚度方向上的变形行为之间提供了局部颈部。希望通过数值模拟UE建立集成的材料测试Sheme。

项目成果

期刊论文数量（11）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Microscopic Analysis of Polycrystalline Material at High Temperature

高温下多晶材料的显微分析

DOI：
发表时间：
2004
期刊：
Acta Metallugica Scinica 17・4
影响因子：
0
作者：
Shoji IMATANI;Ryoichi KAWAKAMI;Yoshiyuki KAWANO
通讯作者：
Yoshiyuki KAWANO

Microscopic Analysis of Polycrystalline Materials at High Temperature

高温下多晶材料的显微分析

DOI：
发表时间：
2004
期刊：
Acta Metallugica Scinica Vol.17,No.4
影响因子：
0
作者：
Shoji IMATANI;Ryoichi KAWAKAMI;Yoshiyuki KAWANO
通讯作者：
Yoshiyuki KAWANO

Size Effect on Crack Analysis by Strain Gradient Material Model

通过应变梯度材料模型进行裂纹分析的尺寸效应

DOI：
发表时间：
2005
期刊：
Proceedings of 11th International Conference on Fracture (CD-ROM)
影响因子：
0
作者：
Shoji IMATANI;Kojiro HATADA;Gerand MAUGIN
通讯作者：
Gerand MAUGIN

Indirect Estimation of Eshelby Stress by Use of Mixed-type Finite Element

混合型有限元间接估计埃谢尔比应力

DOI：
发表时间：
2005
期刊：
Proceedings of VIII International Conference on Computational Plasticity No.2
影响因子：
0
作者：
Shoji IMATANI;Kojiro HATADA;Gerard A.MAUGIN;Shoji IMATANI
通讯作者：
Shoji IMATANI

Characteristics of Temperature Field due to Pulsed Heat Input Calculated by non-Fourier Heat Conduction Hypothesis

非傅立叶热传导假设计算的脉冲热输入温度场特征