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Size effect on springback behavior due to plastic strain gradient hardening in microbending process of pure aluminum foils

机译：纯铝箔微弯曲过程中塑性应变梯度硬化对回弹行为的尺寸影响

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摘要

In order to investigate the springback behavior of pure aluminum foils, scaled microbending experiments with different thicknesses ranging from 25 μm to 500 μm were carried out. In the experiments, it is observed that springback angle increases with decreasing foil thickness, which indicates obvious presence of size effects, and is attributed to plastic strain gradient hardening. So a constitutive model, taking into accounts both plastic strain and plastic strain gradient hardening, is proposed to analyze the microbending process of thin foils. The model is based on the relationship between yield stress and dislocation density, and is adopted to predict the springback angle after microbending both by analytical expressions and by FE simulation. It is confirmed that the predictions by using the proposed hardening model agree well with the experimental data, while those by using conventional elastoplastic model cannot capture such size effects.
机译：为了研究纯铝箔的回弹行为，进行了不同厚度从25μm到500μm的缩放微弯曲实验。在实验中，观察到回弹角随箔厚度的减小而增加，这表明明显存在尺寸效应，并且归因于塑性应变梯度硬化。因此，提出了同时考虑塑性应变和塑性应变梯度硬化的本构模型来分析薄箔的微弯过程。该模型基于屈服应力与位错密度之间的关系，并通过解析表达式和有限元模拟来预测微弯后的回弹角。可以肯定的是，使用建议的硬化模型进行的预测与实验数据吻合良好，而使用常规弹塑性模型的预测则无法捕获此类尺寸效应。

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  • 来源
    《Materials Science and Engineering》 |2010年第17期|P.4497-4504|共8页
  • 作者

    Hezong Li; Xianghuai Dong; Yu Shen; A.Diehl; H. Hagenah; U.Engel; M.Merklein;

  • 作者单位

    National Die & Mold CAD Engineering Research Center, Shanghai Jiao Tong University, 1954 Hua Shan Road, Shanghai, China;

    rnNational Die & Mold CAD Engineering Research Center, Shanghai Jiao Tong University, 1954 Hua Shan Road, Shanghai, China;

    rnNational Die & Mold CAD Engineering Research Center, Shanghai Jiao Tong University, 1954 Hua Shan Road, Shanghai, China;

    Manufacturing Technology, University of Erlangen-Nuremberg Erlangen, Germany;

    rnManufacturing Technology, University of Erlangen-Nuremberg Erlangen, Germany;

    rnManufacturing Technology, University of Erlangen-Nuremberg Erlangen, Germany;

    rnManufacturing Technology, University of Erlangen-Nuremberg Erlangen, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    plastic strain gradient; microbending; springback; size effect;

    机译：塑性应变梯度微弯曲弹回;大小效应;

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