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Numerical analysis of strength mismatch effect on stress field in Charpy specimen

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Abstract

The influence of strength mismatch adjacent to the V-notch in Charpy specimen on stress field has been numerically analyzed with a 3D finite element method. It is found that the softer material adjacent to the V-notch provides a “shielding effect” from high-speed straining introduced by impact loading. As this leads to reduction in flow stress ahead of the V-notch, lower opening stress compared with homogeneous specimen is found in the case of the V-notch within the harder material in heterogeneous specimen. By contrast, in the case of the V-notch within the softer material, plastic strain is concentrated near the V-notch and the opening stress is elevated by constraint due to hard material adjacent to the V-notch. The Charpy impact test was conducted with the Charpy specimen extracted from the clad steel consisted of low- and high-strength steels in order to investigate the strength mismatch effect Charpy absorbed energy K V. It is found that K V value is affected by strength mismatch adjacent to the V-notch and the Weibull stress criterion can be applied to the quantitative evaluation of the strength mismatch effect on K V.

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Authors and Affiliations

  1. Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka, Japan, 565-0871

    Yasuhito Takashima, Yugo S. Yamada & Fumiyoshi Minami

  2. JFE Steel Corporation, Chiba, Japan

    Tsunehisa Handa, Satoshi Igi & Kenji Oi

Authors
  1. Yasuhito Takashima
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  2. Yugo S. Yamada
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  3. Tsunehisa Handa
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  4. Satoshi Igi
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  5. Kenji Oi
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  6. Fumiyoshi Minami
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Corresponding author

Correspondence to Yasuhito Takashima.

Additional information

Doc. IIW-2529, recommended for publication by Commission X “Structural Performances of Welded Joints—Fracture Avoidance”

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Takashima, Y., Yamada, Y.S., Handa, T. et al. Numerical analysis of strength mismatch effect on stress field in Charpy specimen. Weld World 59, 433–441 (2015). https://doi.org/10.1007/s40194-014-0217-9

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  • DOI: https://doi.org/10.1007/s40194-014-0217-9

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