Effects of Hammer Peening on Fatigue Performance of Roof and U-Rib Welds in Orthotropic Steel Bridge Decks
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 11
Abstract
The effects of hammer peening on the fatigue performance of roof and U-rib welds in orthotropic steel bridge decks were studied by fatigue testing and finite element analysis simulation. Eight specimens of roof and U-rib welds were manufactured. The changes in weld geometry and microstructure after hammer peening were measured by the reverse mold and metallographic test. The effects of hammer peening on fatigue life were compared. Through the use of finite element models, the stress and deformation after hammer peening, and the effects of hammerhead radius and hammer depth were investigated; operational suggestions regarding hammer peening were also proposed. The results indicated that hammer peening reduced the geometric mutation of welds and generated a stratiform microstructure near the surface. The fatigue life of roof and U-rib welds increased significantly after hammer peening. The influence depth of residual compressive stress induced by hammer peening increased as the hammerhead radius increased, while the maximum compressive stress decreased without changes to its distribution. The principal stress and influence depth of the applied compressive stress increased with increasing hammer depth as well. The Hammer peening parameters of a 4 mm hammerhead radius and a 0.5 mm hammer depth were suggested.
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Acknowledgments
The authors appreciate the support of The National Natural Science Fund of China (Nos. 51678216 and 51678215).
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 11 • November 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Dec 17, 2016
Accepted: May 31, 2018
Published online: Sep 8, 2018
Published in print: Nov 1, 2018
Discussion open until: Feb 8, 2019
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