A study on improvement of fatigue performance by shot blasted surface treatment

Toshihiro Fujii, Koji Gotoh, Junichi Deguchi, Koji Murakami

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Recently, the strength of the hull structure including fatigue strength has seen significant improvement because of application of IACS CSR (Common Structure rule), developed by IACS. Various methods which can increase the fatigue strength at welded joints are suggested, since the damage morphology on the recently welded structures was observed to be primarily fatigue failure. In Shipbuilding industry, smoothening of the welding bead toe by grinding is the method that is customarily adopted in order to increase fatigue strength. And recently, peening treatment at the welding bead has also been adopted. The peening treatment can reduce stress concentration by smoothening of the welding bead toe, and a compressive residual stress field generated by the impact of peening. In case of generating compressive residual stress by impact, the same effect could be expected by shot blasting, which is the steel surface treatment before painting. In this study, the condition of the residual stress generated at welding toe by shot blasting was investigated, and then from results of the fatigue test, the increase in fatigue strength due to residual stress is verified.

Original languageEnglish
Title of host publicationMaterials Technology
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791858790
DOIs
Publication statusPublished - Jan 1 2019
EventASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2019 - Glasgow, United Kingdom
Duration: Jun 9 2019Jun 14 2019

Publication series

NameProceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
Volume4

Conference

ConferenceASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2019
CountryUnited Kingdom
CityGlasgow
Period6/9/196/14/19

All Science Journal Classification (ASJC) codes

  • Ocean Engineering
  • Energy Engineering and Power Technology
  • Mechanical Engineering

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  • Cite this

    Fujii, T., Gotoh, K., Deguchi, J., & Murakami, K. (2019). A study on improvement of fatigue performance by shot blasted surface treatment. In Materials Technology [V004T03A044] (Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE; Vol. 4). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/OMAE2019-95817