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International Journal of Steel Structures

Published in:

05-09-2018

Fatigue Strength Improvement and Fatigue Crack Closure by Portable Pneumatic Needle-Peening Treatment on Welded Joints

Authors: Koji Kinoshita, Yuki Banno, Yuki Ono, Shohey Yamada, Mitsuru Handa

Published in: International Journal of Steel Structures | Issue 3/2019

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Abstract

This study experimentally investigates effect of fatigue strength improvement of the Portable Pneumatic Needle-Peening treatment (PPP treatment) as a needle peening on out-of-plane gusset welded joints by using plate bending fatigue tests. This study also examined effect of the travel speed and the number of treatment passes of the PPP treatment with regards to its fatigue strength improvement. After the fatigue tests, the observation of the fracture surface with Scanning Electron Microscope was carried out in order to clarify the crack initiation. From those test results, it may be concluded that the effect of fatigue strength improvement might be governed by treatment passes with sufficient travel speed. In addition, this study carried out additional fatigue tests that focus on fatigue crack closer by using the PPP treatment. As a result of additional fatigue tests for fatigue crack closure, it might be said that the effect of fatigue crack closure is effective when the distance between fatigue cracks and treatment area is less than 2.0 mm.

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Title: Fatigue Strength Improvement and Fatigue Crack Closure by Portable Pneumatic Needle-Peening Treatment on Welded Joints
Authors: Koji Kinoshita
Yuki Banno
Yuki Ono
Shohey Yamada
Mitsuru Handa
Publication date: 05-09-2018
Publisher: Korean Society of Steel Construction
Published in: International Journal of Steel Structures / Issue 3/2019
Print ISSN: 1598-2351
Electronic ISSN: 2093-6311
DOI: https://doi.org/10.1007/s13296-018-0153-4

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