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Effects of loading mode on the fatigue behavior of laser welds in automobile mild steel sheet

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Abstract

In this study, to clarify the effect of the loading mode on the fatigue properties of laser-welded joints, the fatigue properties and the fatigue crack behavior were experimentally investigated by using two types of laser-welded joint: tension-shear type (TS-type) and cross-tension type (CT-type). Furthermore, to clarify the effect of the bead width of laser welding on fatigue properties, CT-type joints with a wider bead width were also prepared (CT-wide-type). From static tensile and fatigue tests, TS-type and CT-type joints possess significant low fatigue resistance given the static strength of both joints. The macroscopic fracture morphologies of TS-type and CT-type joints with a narrow bead width are dependent on the applied force amplitude. However, the macroscopic fracture morphologies of CT-wide-type joints, which have a wider bead width, are not affected by the force amplitude level. In addition, using an external force to organize the fatigue strength of laser-welded joints with different loading modes is difficult. However, our fracture-mechanics approach based on the stress intensity factor at the slit tip, as calculated by FEM analyses, can be used to organize the fatigue strength of various joints irrespective of the loading mode.

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Acknowledgments

This work has been supported by the Grant-in-Aid for Scientific Research (B) no.25289009 of JSPS KAKENHI Grant from 2013. We are grateful for their support. Also, the authors would like to thank a section of fatigue reliability in Society of Automotive Engineers of Japan for supplying the materials.

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Authors and Affiliations

  1. Department of Mechanical Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi Hiroshima, Hiroshima, Japan

    Masayoshi Inohara, Hiroyuki Akebono, Masahiko Kato & Atsushi Sugeta

Authors
  1. Masayoshi Inohara
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  2. Hiroyuki Akebono
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  3. Masahiko Kato
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  4. Atsushi Sugeta
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Corresponding author

Correspondence to Hiroyuki Akebono.

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Recommended for publication by Commission XIII - Fatigue of Welded Components and Structures

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Inohara, M., Akebono, H., Kato, M. et al. Effects of loading mode on the fatigue behavior of laser welds in automobile mild steel sheet. Weld World 60, 535–545 (2016). https://doi.org/10.1007/s40194-016-0303-2

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  • DOI: https://doi.org/10.1007/s40194-016-0303-2

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