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Pre-strain effect of on fracture performance of high-strength steel welds

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Abstract

Fracture toughness of pre-strain effect was determined as a function of the temperature in structural steels of the 600 to 780 MPa class. Cyclic loading during earthquakes produces pre-strain in the component, which is enhanced at the region of strain concentration. During the Kobe Great Earthquake in 1995 in Japan, 10 to 15 % pre-strain was recorded at the beam-to-column connection. The relationship between critical CTOD and CGHAZ length was sampled by fatigue pre-crack for pre-strained HAZ, which is a significant decrease compared to that of the base metal. Furthermore, the effect of pre-strain is discussed in terms of the CTOD and Charpy impact energy of the local brittle zone.

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Author information

Authors and Affiliations

  1. Dept. of Naval Architecture and Ocean Engineering, Chosun University, Chosun, Korea

    Gyubaek An

  2. Department of Civil Engineering, Chosun University, Chosun, Korea

    Jeong-Ung Park

  3. Department of Engineering Materials and Manufacturing Science, Osaka University, Osaka, Japan

    Mituru Ohata

  4. Joining & Welding Research Institute, Osaka University, Osaka, Japan

    Fumiyoshi Minami

Authors
  1. Gyubaek An
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  2. Jeong-Ung Park
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  3. Mituru Ohata
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  4. Fumiyoshi Minami
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Corresponding author

Correspondence to Jeong-Ung Park.

Additional information

Recommended by Associate Editor Hak-Sung Kim

Gyubaek An received his Ph.D. degree Department of Manufacturing Science Osaka University in Japanm 2001. He is an Assistant Professor at Department of Naval Architecture & Ocean Engineering, Chosun University, Republic of Korea.

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An, G., Park, JU., Ohata, M. et al. Pre-strain effect of on fracture performance of high-strength steel welds. J Mech Sci Technol 32, 3145–3151 (2018). https://doi.org/10.1007/s12206-018-0617-7

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  • DOI: https://doi.org/10.1007/s12206-018-0617-7

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