Microbending Moment of Brass Foils Based on Strain Gradient Hardening Model

Journal of Shanghai Jiaotong University ›› 2011, Vol. 45 ›› Issue (11): 1668-1672.

• Metallography and Metallurgical Technology • Previous Articles Next Articles

Microbending Moment of Brass Foils Based on Strain Gradient Hardening Model

(1. Department of Plasticity Technology, Shanghai Jiaotong University, Shanghai 200030， China;2. Department of Mechanical and Electronic Engineering, Hebei University of Engineering,Handan 056038, Hebei, China; 3. Chair of Manufacturing Technology, University of ErlangenNuremberg, Erlangen 91058, Germany)

Received:2011-01-19 Online:2011-11-30 Published:2011-11-30

Abstract

Abstract: The microbending experiments of brass were investigated and there exist the obvious size effects that bending moment increases with foil thickness decreasing. The microbending moments are predicted by classical plastic theory and different strain gradient theories, which shows that the predicted results based on the modified NixGao model are very close to the experimental data and the equation of material intrinsic length is reasonable. The material intrinsic length is the function of shear modulus, initial yield strength, Burger’s vector and twins layers across the foil thickness.

Key words: CuZn37 brass, microbending, bending moment, strain gradient, material intrinsic length

CLC Number:

TG301

References

［1］Engel U, Eckstein R. Microformingfrom basic research to its realization［J］. J Mater Process Tech, 2002,125: 3544.

［2］李经天, 董湘怀, 黄菊花, 微细塑性成形研究进展［J］. 塑性工程学报, 2004,11(4): 18.

LI Jingtian, DONG Xianghuai, HUANG Juhua, Progress in microforming［J］. J Plasticity Eng, 2004,11(4): 18.

［3］Stlken J S, Evans A G, A microbend test method for measuring the plasticity length scale［J］. Acta Mater, 1998,46: 51095115.

［4］Suzuki K, Matsuki Y, Masaki K, et al. Tensile and microbend tests of pure aluminum foils with different thicknesses［J］. Mat Sci Eng A, 2009,513(14): 7782.

［5］王春举, 汪鑫伟, 郭斌, 等, C2680黄铜箔微弯曲回弹规律研究［J］. 材料科学与工艺, 2009, 17(1): 57.

WANG Chunju, WANG Xinwei, GUO Bin, et al. Springback of C2680 brass foil in microbending test［J］. Mat Sci Tech, 2009, 17(1): 57.

［6］Fleck N A, Hutchinson J W. A reformulation of strain gradient plasticity［J］. J Mech Phys Solids, 2001,49: 22452271.

［7］Zhu H X, Karihaloo B L. Sizedependent bending of thin metallic films［J］. Int J Plasticity, 2008,24: 9911007.

［8］Nix W D, Gao H J. Indentation size effects in crystalline materials: A law for strain gradient plasticity［J］. J Mech Phys Solids, 1998,46: 411425.

［9］Li H Z, Dong X H, Shen Y, et al. Size effect on springback behavior due to plastic strain gradient hardening in microbending process of pure aluminum foils［J］. Mat Sci Eng A, 2010,527: 44974504.

［10］冯秀艳, 郭香华, 方岱宁, 等. 微薄梁三点弯曲的尺度效应研究［J］. 力学学报, 2007,39(4): 479485.

FENG Xiuyan, GUO Xianghua, FANG Daining, et al. Threepoint microbend size effects for pure Ni foils［J］. Chin J Theor Appl Mech, 2007,39(4): 479485.

［11］Li H Z, Dong X H, Wang Q, et al. Determination of material intrinsic length and strain gradient hardening in microbending process［J］. Int J Solids Struct, 2011,48: 163174.

[1]	NIE Dongqing^1∗ (聂东清), ZHAI Zhiyang¹ (翟之阳), ZHANG Wei¹ (张威), LI Zhi² (李志). Finite Element Analysis of Effects of Improvement of Soil Between Double-Row Piles [J]. J Shanghai Jiaotong Univ Sci, 2024, 29(5): 919-929.
[2]	VU Van Tuyen, YANG Ping(杨平). Tool for Predicting the Ultimate Bending Moment of Ship and Ship-Shaped Hull Girders [J]. Journal of Shanghai Jiao Tong University (Science), 2018, 23(4): 515-.
[3]	MA Wang-kou, LIU Jun. Fatigue Analysis of Truss Tubular Joints of a New-Type Production and Storage SPAR [J]. Ocean Engineering Equipment and Technology, 2018, 5(4): 252-258.
[4]	XIA Yiqing,WANG Yingguang. Calculation of Out-of-Plane Bending Moment at the Blade Root of Offshore Wind Turbines by Statistic Extrapolation [J]. Journal of Shanghai Jiaotong University, 2013, 47(12): 1968-1973.
[5]	WANG Fei,CHEN Jingbiao,TU Xinghua. Numerical Simulation of Towed LowTension Cable [J]. Journal of Shanghai Jiaotong University, 2010, 44(06): 828-0832.
[6]	ZENG Xiaoxing,YU Haidong,ZHANG Kaizhi,WANG Hao . Bending Moments Study on the Cutterheads of Shield Machines Excavating in Composition Geologic Strata [J]. Journal of Shanghai Jiaotong University, 2010, 44(01): 51-55.

Microbending Moment of Brass Foils Based on Strain Gradient Hardening Model

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 6

Recommended Articles

Metrics

Comments