Stress drop, Luders strain and strain rate during serrated flow

Ryuta Onodera, Minahiro Nonomura, Masatoshi Aramaki

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)

    Abstract

    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
    Volume64
    Issue number12
    DOIs
    Publication statusPublished - 2000

    All Science Journal Classification (ASJC) codes

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

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