Pulsating Propagation of Strain-Localized Band in Plastic Deformation of an Al-Alloy Sample Observed by Electronic Speckle Pattern Interferometry(Optical Method 2)

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概要

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• An ESPI system which make it possible to observe dynamic phenomena of a whole object field was applied to observe plastic deformation process in tensile experiments of aluminum alloy samples. Dynamic behavior of strain-localized band (SLB) caused by Potevin-LeChaterie effect was clearly observed on an animating picture. We found that the propagating behavior of the SLB consisted of pulsating variation which we called Localized Strain Pulsation (LSP). There are two stages in lire whole process of plastic deformation. In the earlier half process, moving fringes vary drastically corresponding to stress concentration and relaxation accompanied by large amplitude of serrated variation of the stress curve. On the other hand in the later half process, fringe movement is rather gentle. Switching of the orientation of the SLB was also observed. These phenomena which were newly discovered by the ESPI suggest wavy propagation of plastic deformation.

• 一般社団法人日本機械学会の論文
• 2001-10-20

著者

• Toyooka Satoru

  Graduate School Of Science And Engineering Saitama University

• Zhang Qingchuan

  Graduate School of Science and Engineering, Saitama University

• Zhang Qingchuan

  Graduate School Of Science And Engineering Saitama University

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