Fatigue Crack Growth and Control of 14MnNbq Welding Plates Used for Bridges
Publication: Journal of Engineering Mechanics
Volume 138, Issue 1
Abstract
The fatigue-crack growth (FCG) behavior of 14MnNbq bridge steel was experimentally investigated in this paper. The fatigue-crack growth rate and threshold under different stress ratios ( ) are given for 14MnNbq base metal (BM), heat affected zone (HAZ), and weld metal (WM), respectively. Using the test results, an approach to determine the fatigue-crack closure factor by threshold values is proposed and a uniform expression of fatigue crack growth rate including stress ratio is presented. Furthermore, the prediction of surface-crack growth is presented and the results are compared with the test results obtained from surface-crack growth tests under tensile/bending loading. Finally, a damage tolerance design method based on the condition of no crack growth is proposed, and suggestions about the fatigue design technique and accuracy requirement of nondestructive testing are proposed.
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Information
Published In
Journal of Engineering Mechanics
Volume 138 • Issue 1 • January 2012
Pages: 30 - 35
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Sep 10, 2009
Accepted: Jun 30, 2011
Published online: Dec 15, 2011
Published in print: Jan 1, 2012
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