中国物理B ›› 2006, Vol. 15 ›› Issue (10): 2378-2384.doi: 10.1088/1009-1963/15/10/032

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Deformation measurements of three types of Portevin--Le Chatelier bands

项国富, 张青川, 刘颢文, 江慧丰, 伍小平   

  1. CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027, China
  • 收稿日期:2005-11-17 修回日期:2006-06-02 出版日期:2006-10-20 发布日期:2006-10-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 1023030 and 10372098).

Deformation measurements of three types of Portevin--Le Chatelier bands

Xiang Guo-Fu (项国富), Zhang Qing-Chuan (张青川), Liu Hao-Wen (刘颢文), Jiang Hui-Feng (江慧丰), Wu Xiao-Ping (伍小平)   

  1. CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027, China
  • Received:2005-11-17 Revised:2006-06-02 Online:2006-10-20 Published:2006-10-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 1023030 and 10372098).

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摘要： In this paper a technique based on high-speed digital photography and the digital speckle correlation (DSC) method is used for the quantitative measurement of the displacement and strain fields of various Portevin--Le Chatelier (PLC) bands (types A, B, and C). The experimental results clearly show the nucleation process of a type-B band and the propagation of a type-A band. The results also reveal that there exists an elastic shrinkage deformation outside a PLC band during a large avalanche-like deformation inside the PLC band.

关键词: Portevin--Le Chatelier (PLC) effect, digital speckle correlation (DSC) method, shear band, dynamic strain aging (DSA)

Abstract: In this paper a technique based on high-speed digital photography and the digital speckle correlation (DSC) method is used for the quantitative measurement of the displacement and strain fields of various Portevin--Le Chatelier (PLC) bands (types A, B, and C). The experimental results clearly show the nucleation process of a type-B band and the propagation of a type-A band. The results also reveal that there exists an elastic shrinkage deformation outside a PLC band during a large avalanche-like deformation inside the PLC band.

Key words: Portevin--Le Chatelier (PLC) effect, digital speckle correlation (DSC) method, shear band, dynamic strain aging (DSA)

中图分类号:  (Deformation and plasticity)

  • 62.20.F-
81.40.Jj (Elasticity and anelasticity, stress-strain relations) 81.40.Lm (Deformation, plasticity, and creep) 81.70.Bt (Mechanical testing, impact tests, static and dynamic loads) 81.70.Pg (Thermal analysis, differential thermal analysis (DTA), differential thermogravimetric analysis)