Stress drop, Luders strain and strain rate during serrated flow

Ryuta Onodera, Minahiro Nonomura, Masatoshi Aramaki

Research output: Contribution to journalArticle

11 Citations (Scopus)


Load and strain were recorded at every 1 ms interval during the serrated flow in annealed Al-4Cu-0.5Mg-0.5Mn alloy. The strain was measured by four minute strain gauges (0.15 mm length) stuck on the specimen at 0.5 mm intervals. The Luders strain was 0.3%-1% and the Luders strain rate (maximum value) was 0.1-0.6 s-1 for average strain rates between 6×10-5 and 3×10-2 s-1. The Luders band length was about 2-3 mm. In the test with the average strain rate of 3×10-3 s-1 two staged Luders deformation occurred, that is, a fast deformation (0.1 s-1) was followed by a slow one (0.01 s-1). The current theory, which is based on the concept of the negative strain rate sensitivity of the flow stress, could not explain the experimental results mentioned above.

Original languageEnglish
Pages (from-to)1162-1171
Number of pages10
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Issue number12
Publication statusPublished - Jan 1 2000

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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