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Open AccessArticle

Improved Formula for the Stress Intensity Factor of Semi-Elliptical Surface Cracks in Welded Joints under Bending Stress

by Yang Peng 1, Chao Wu 2, Yifu Zheng 1,3 and Jun Dong 1,*
1
College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China
2
School of Transportation Science and Engineering, Beihang University, Beijing 100191, China
3
Nanjing Municipal Design and Research Institute Co. Ltd., Nanjing 211008, China
*
Author to whom correspondence should be addressed.
Academic Editor: Zengtao Chen
Materials 2017, 10(2), 166; https://doi.org/10.3390/ma10020166
Received: 15 November 2016 / Revised: 10 January 2017 / Accepted: 22 January 2017 / Published: 13 February 2017
(This article belongs to the Special Issue Modelling and Characterization of Defects in Metals)
Welded joints are prone to fatigue cracking with the existence of welding defects and bending stress. Fracture mechanics is a useful approach in which the fatigue life of the welded joint can be predicted. The key challenge of such predictions using fracture mechanics is how to accurately calculate the stress intensity factor (SIF). An empirical formula for calculating the SIF of welded joints under bending stress was developed by Baik, Yamada and Ishikawa based on the hybrid method. However, when calculating the SIF of a semi-elliptical crack, this study found that the accuracy of the Baik-Yamada formula was poor when comparing the benchmark results, experimental data and numerical results. The reasons for the reduced accuracy of the Baik-Yamada formula were identified and discussed in this paper. Furthermore, a new correction factor was developed and added to the Baik-Yamada formula by using theoretical analysis and numerical regression. Finally, the predictions using the modified Baik-Yamada formula were compared with the benchmark results, experimental data and numerical results. It was found that the accuracy of the modified Baik-Yamada formula was greatly improved. Therefore, it is proposed that this modified formula is used to conveniently and accurately calculate the SIF of semi-elliptical cracks in welded joints under bending stress. View Full-Text
Keywords: stress intensity factor; welded joints; bending stress; fracture mechanics stress intensity factor; welded joints; bending stress; fracture mechanics
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MDPI and ACS Style

Peng, Y.; Wu, C.; Zheng, Y.; Dong, J. Improved Formula for the Stress Intensity Factor of Semi-Elliptical Surface Cracks in Welded Joints under Bending Stress. Materials 2017, 10, 166.

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