Evaluation of Micro Plastic Characteristic of Metals by Micro Indentation for Precise Analysis on Metal Forming

通过微压痕评估金属的微塑性特性，以精确分析金属成形

• 批准号: 22760563
• 负责人: FURUSHIMA Tsuyoshi
• 金额: $ 2.5万
• 依托单位: Tokyo Metropolitan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22760563/
• 关键词: マイクロ加工; マイクロ塑性流動; 微小硬さ試験; 不均質性; 硬さ試験; ナノインデンテーション

The purposes of this study are development of evaluating micro plastic characteristic by micro indentation and establishment of precise analysis on metal forming. As an evaluation method of micro plastic characteristic, the micro indentation tests are conducted for aluminum alloys, steels, copper alloys and magnesium alloys to evaluate the micro characteristic of crystal grain unit. As a result, hardness of each grain has a good correlation with variation in flow stress. In addition, a finite element(FE) model considering material inhomogeneity is developed to investigate the physical meaning of micro plastic characteristic. As a result, the material inhomogeneity as a micro plastic characteristic can be evaluated successfully by micro indentation test, uni-axial tensile test and simulation results. Furthermore, the free surface roughening behavior which cannot be expressed by uniform FE model can be predicted successfully by inhomogeneous FE model under axial stress state. Consequently, precise analysis on metal forming can be realized by these results.

本研究的目的是发展通过微压痕评估微塑性特性并建立金属成形的精确分析。作为微观塑性特性的评价方法，对铝合金、钢、铜合金和镁合金进行微观压痕试验，评价晶粒单元的微观特性。因此，每个晶粒的硬度与流动应力的变化具有良好的相关性。此外，还开发了考虑材料不均匀性的有限元（FE）模型来研究微塑性特性的物理意义。因此，可以通过微压痕试验、单轴拉伸试验和模拟结果成功地评估材料不均匀性作为微塑性特征。此外，在轴向应力状态下，均匀有限元模型无法表达的自由表面粗糙行为可以通过非均匀有限元模型成功预测。因此，通过这些结果可以实现对金属成形的精确分析。

项目成果

In-situ Observation and Anisotropy of Free Surface Roughening for Polycrystalline Metals

多晶金属自由表面粗糙化的原位观察和各向异性

• 发表时间: 2010
• 期刊: Key Engineering Materials
• 作者: T. Furushima;T. Masuda;K. Manabe
• 通讯作者: K. Manabe

Material Inhomogeneity Modeling for Micro Metal Forming

微金属成型的材料不均匀性建模

• 发表时间: 2011
• 作者: 伊藤暁彦;尤玉;塗溶;後藤孝;T.Furushima
• 通讯作者: T.Furushima

不均質性を考慮した有限要素解析による多軸応力下の自由表面あれ挙動と連続観察

多轴应力下的自由表面粗糙度行为以及考虑不均匀性的有限元分析连续观察

• 发表时间: 2011
• 作者: 古島剛,増田哲朗,真鍋健一;S. Alexsandrov
• 通讯作者: S. Alexsandrov

Prediction of Free Surface Roughening by 2D and 3D FE Model Considering Material Inhomogeneity

考虑材料不均匀性的 2D 和 3D 有限元模型预测自由表面粗糙度

• 发表时间: 2011
• 作者: T.Furushima;T.Masuda;K.Manabe;S.Alexandrov
• 通讯作者: S.Alexandrov

FE Simulation Considering Mesoscopic Material Inhomogenetiy For Prediction of Free Surface Roughening

考虑细观材料不均匀性的有限元模拟用于预测自由表面粗糙化

• 发表时间: 2011
• 作者: T.Furushima;T.Masuda;K.Manabe
• 通讯作者: K.Manabe