Determination of material intrinsic length and strain gradient hardening in microbending process

Li Hezong , Dong Xianghuai , Wang Qian , Shen Yu , Diehl A, Hagenah H, Engel U, Merklein M (2011)

Publication Type: Journal article

Publication year: 2011

Journal

International Journal of Solids and Structures Elsevier

Publisher: None

Book Volume: 48

Pages Range: 163-174

Journal Issue: 1

DOI: 10.1016/j.ijsolstr.2010.09.016

Abstract

Microbending experiments of pure aluminum show that the springback angles increase with the decrease of foil thickness, which indicates obvious size effects and attributes to plastic strain gradient hardening. Then a constitutive model, taking into accounts both plastic strain and plastic strain gradient hardening, is proposed to analyze the microbending process of thin foil. The model is based on the relationship between shear yield stress and dislocation density, in which the material intrinsic length is related to material properties and average grain numbers along the characteristic scale direction of part. It is adopted in analytical model to calculate the non-dimensional bending moment and predict the springback angle after microbending. It is confirmed that the predictions by the proposed hardening model agree well with the experimental data, while those predicted by the classical plasticity model cannot capture such size effects. The contribution of plastic strain gradient increases with the decrease of foil thickness and is independent on the bending angle. © 2010 Elsevier Ltd. All rights reserved.

Authors with CRIS profile

Hinnerk Hagenah Institute of Manufacturing Technology (LFT) Ulf Engel Institute of Manufacturing Technology (LFT) Marion Merklein Institute of Manufacturing Technology (LFT)

Additional Organisation(s)

Institute of Manufacturing Technology (LFT)

Involved external institutions

Shanghai Jiao Tong University / 上海交通大学 CN China (CN)

How to cite

APA:

Li Hezong, ., Dong Xianghuai, ., Wang Qian, ., Shen Yu, ., Diehl, A., Hagenah, H.,... Merklein, M. (2011). Determination of material intrinsic length and strain gradient hardening in microbending process. International Journal of Solids and Structures, 48(1), 163-174. https://doi.org/10.1016/j.ijsolstr.2010.09.016

MLA:

Li Hezong, , et al. "Determination of material intrinsic length and strain gradient hardening in microbending process." International Journal of Solids and Structures 48.1 (2011): 163-174.

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