Investigation of Size Effects of 304 Stainless Steel Foils in Microforming Processes

China Mechanical Engineering ›› 2013, Vol. 24 ›› Issue (02): 280-283.

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Investigation of Size Effects of 304 Stainless Steel Foils in Microforming Processes

Meng Qingdang1;Li Hezong2;Dong Xianghuai1;Peng Fang1;Wang Qian1

1.Shanghai Jiao Tong University,Shanghai,200030
2.Hebei University of Engineering,Handan,Hebei,056038

Online:2013-01-25 Published:2013-02-01
Supported by:

National Natural Science Foundation of China（No. 50835002,50821003,50975174）;
Research Fund for the Doctoral Program of Higher Education of China（No.20100073110044,200802480053）

304不锈钢薄板微塑性成形尺寸效应的研究

孟庆当1;李河宗2;董湘怀1;彭芳1;王倩1

1.上海交通大学,上海,200030
2.河北工程大学,邯郸,056038

基金资助:
国家自然科学基金资助项目(50835002,50821003,50975174);高等学校博士学科点专项科研基金资助项目(20100073110044,200802480053）
National Natural Science Foundation of China（No. 50835002,50821003,50975174）;
Research Fund for the Doctoral Program of Higher Education of China（No.20100073110044,200802480053）

Abstract

Abstract:

Uniaxial tension and microbending tests were conducted using 304 stainless steel foils with varied thicknesses from 10μm to 200μm.In the tests,the yield stress and springback angle increased with decreasing foil thickness,showing the size effects of “the thinner the stronger”.The Hall-Petch equation was modified by introducing the influence of foil relative thickness,and applied to calculate yield stress with better agreement with test results.
The modified Nix-Gao strain gradient hardening model was used to predict the relationship between springback angle and foil thickness,which agree with the test results.

Key words: 304 stainless steel, yield stress, strain gradient, springback angle

摘要：

针对五种厚度304不锈钢薄板进行了单向拉伸试验和微弯曲试验,测得的屈服应力和回弹角均随板厚减薄而增大,表现出“越薄越强”的尺寸效应现象。通过在Hall-Petch公式中引入相对厚度项对公式进行修正,使得对屈服应力的预测与试验结果更吻合。采用修正的Nix-Gao应变梯度强化模型预测了回弹角与板厚的关系，预测结果与试验结果吻合。



关键词: 304不锈钢, 屈服应力, 应变梯度, 回弹角 

CLC Number:

TG301

MENG Qiang-Dang-1, LI He-Zong-2, DONG Xiang-Fu-1, BANG Fang-1, WANG Qian-1. Investigation of Size Effects of 304 Stainless Steel Foils in Microforming Processes[J]. China Mechanical Engineering, 2013, 24(02): 280-283.

孟庆当1, 李河宗2, 董湘怀1, 彭芳1, 王倩1. 304不锈钢薄板微塑性成形尺寸效应的研究[J]. 中国机械工程, 2013, 24(02): 280-283.

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Investigation of Size Effects of 304 Stainless Steel Foils in Microforming Processes

304不锈钢薄板微塑性成形尺寸效应的研究

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