Analysis of micro/mesoscale sheet forming process with uniform size dependent material constitutive model
Analysis of micro/mesoscale sheet forming process with uniform size dependent material constitutive model
复制标题
采用均匀尺寸相关材料本构模型分析微/中尺度板材成形过程
DOI：
10.1016/j.msea.2009.06.061
复制
发表时间：
2009-11-25
期刊：
影响因子：
6.4
通讯作者：
Ni, Jun
中科院分区：
文献类型：
--
作者：
Peng, Linfa;Lai, Xinmin;Ni, Jun
基于精确的材料模型，有限元（FE）方法成为传统金属成形工艺设计的有力工具。然而，由于尺寸/尺度效应，传统的材料模型无法描述微观/介观尺度的材料行为。因此，传统宏观成形中获得的大多数技术并不适用于微成形过程。在本研究中，通过引入比例因子，建立了一个统一的尺寸相关本构模型，描述从宏观尺度到微观尺度的材料行为评估。它包含两个不同的术语：尺寸相关术语和尺寸独立术语。此外，制备了SUS304板材试样，并进行单轴拉伸实验来验证材料模型。基于这种均匀尺寸相关本构模型，建立了微/介观板材成形过程的数值模拟模型，以研究尺寸效应的影响。结果表明，考虑尺寸效应与不考虑尺寸效应的冲裁力和米塞斯应力分布存在明显差异。因此，微/细观成形工艺设计应考虑尺寸效应。 (C) 2009 Elsevier B.V. 保留所有权利。
Based on accurate material models, finite element (FE) method becomes a powerful tool in conventional metal forming process design. However, conventional material models cannot describe the material behaviors in micro/mesoscale due to size/scale effects. As a result, most know-how obtained in traditional macroforming is not suitable for the microforming process.In the present study, a uniform size dependent constitutive model, describing the evaluation of the material behaviors from macroscale to microscale, is established by introducing the scale factor. It contains two different terms: size dependent term and size independent term. Moreover, SUS304 sheet specimens are prepared and uniaxial tension experiments are performed to validate the material model.Based on this uniform size dependent constitutive model, numerical simulation models of micro/mesosheet forming process are established to investigate the influence of the size effects. The results show that there is obvious difference in the punch force and Mises stress distribution between the results with consideration of size effects and that without size effects. Therefore, the size effects should be considered in micro/mesoforming process design. (C) 2009 Elsevier B.V. All rights reserved.