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Strength and deformability of corroded steel plates under quasi-static tensile load

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Abstract

The objective of this study was to estimate the strength and deformability of corroded steel plates under quasi-static uniaxial tension. In order to accurately simulate this problem, we first estimated the true stress–strain relationship of a flat steel plate by introducing a vision sensor system to the deformation measurements in tensile tests. The measured true stress–stain relationship was then applied to a series of nonlinear implicit three-dimensional finite element analyses using commercial code LS-DYNA. The strength and deformability of steel plates with various pit sizes, degrees of pitting intensity, and general corrosion were estimated both experimentally and numerically. The failure strain in relation to the finite element mesh size used in the analyses was clarified. Two different steels having yield ratios of 0.657 and 0.841 were prepared to examine the material effects on corrosion damage. The strength and deformability did not show a clear dependence on the yield ratios of the present two materials, whereas a clear dependence was shown with respect to the surface configuration such as the minimum cross-sectional area of the specimens, the maximum depth of the pit cusp from the mean corrosion diminution level, and pitting patterns. Empirical formulae for the reduction of deformability and the reduction of energy absorption of pitted plates were proposed which may be useful in strength assessment when examining the structural integrity of aged corroded structures.

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Acknowledgments

The authors express their earnest gratitude to Professors Y. Kawamura and T. Wada for their valuable suggestions and comments on this work, and thanks are extended to Mr. N. Yamamura, Mr. Y. Yamamuro, Mr. K. Shimoda, and Mr. S. Michiyama for their support. This work was supported by Grant-in-Aid for Scientific Research (A(2) 17206086) from the Ministry of Education, Culture, Sports, Science and Technology of Japan to Yokohama National University. The materials used for the experiments were specially processed and provided by the Nippon Steel Corporation. One of the authors, Md. M.A., is supported by a Japanese Government Scholarship. The authors are most grateful for these supports.

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Authors and Affiliations

  1. Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan

    Md. Mobesher Ahmmad

  2. Faculty of Engineering, Systems Design for Ocean-Space, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan

    Y. Sumi

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  1. Md. Mobesher Ahmmad
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  2. Y. Sumi
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Correspondence to Y. Sumi.

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Ahmmad, M.M., Sumi, Y. Strength and deformability of corroded steel plates under quasi-static tensile load. J Mar Sci Technol 15, 1–15 (2010). https://doi.org/10.1007/s00773-009-0066-1

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  • DOI: https://doi.org/10.1007/s00773-009-0066-1

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