Study on Fatigue Strength of Welding Joint in Wuhan Iron and Steel

Abstract:

As abrupt change of the shape and elastic constant in the weld area occurs to the welding joint, there will be obvious stress concentration near the weld area when being loaded. Lifting and Lowering Method and Grouping Method prevailing in the world are applied to conduct an experiment about fatigue strength of a certain welding joint in Wuhan Iron and Steel and S-N curve is drawn in this paper based on the condition of nominal stress. In addition, the influence of weld size of the welding joint on the distribution of stress is studied through the calculation of finite element numeral value and experimental test. According to the factor of stress concentration, S-N curve is modified to provide the data support for the application of the welding joint and assessment of fatigue strength.

• Periodical: Advanced Materials Research (Volumes 538-541)
• Pages: 1492-1497
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.538-541.1492
• Online since: June 2012
• Authors: Zhen Ping Fan, Xiao Wu, Qiang Li
• Keywords: Fatigue Strength, Stress Concentration, Welding Joint

References

[1] Peng Fan, Yao Yunjian, Gu Yongjun. Fatigue Assessment of Welding Joint Relating to Hot Spot Stress Gradient . Chinese Journal of Mechanical Engineering. .2010, 46 (22),65~69

DOI: 10.3901/jme.2010.22.065

[2] Zheng Lichun. Overview of Prediction Method of Fatigue Crack Initiation Life . Mechanics and Practice. 1996.18 (4).9~14.

[3] Wang Chao, Wei Yanhong. Simulation on Mechanical Properties of Steel Welding Joint . Welding. 2011.1, 57~61.

[4] Xie Hui. Crack Features and Analysis of Generation Mechanism of Aluminium Alloy Welding Joint . Modern Business Trade Industry. 2011.1, 57~61.

[5] Zhou Zhangyi, Li Fei , Bu Jiling. Study on Assessment Method of Welding Structure Based on Nominal Stress . Diesel Locomotive. 2007.7, 7

[6] Gao Zhentong. Fatigue Reliability . Beijing: Beijing University of Aeronautics and Astronautics Press, 2000:133~149, 293~298.

[7] Zhao Shaobian. Design of Fatigue Resistance . Beijing: China Machine Press, 1994：35~40.

[8] GB/T 3075-2008, Test Method for Metal Axial Fatigue

[9] Lin Tingchang. Analysis on Fatigue Reliability of Typical Welding Joint . A Thesis of Master's Degree of Beijing Jiaotong University, 2006.66~70

[10] Zuoteng Bangyan etc. Influence of Slope Shape, Thickness of Plating, Weld Width and Angle of Weld Root on Stress Concentration Factor of Weld Root, Abroad Welding Technique, 1980.3

[11] Zhao Minghao etc. Study on Fatigue Strength of Steel Welding Joint of High Strength , Mechanical Strength, 2005, 27 (5):687~690

[12] Wang Jianjiang etc. ANSYS 11.0 Finite Element Analysis of Structure and Thermodynamics. Beijing, China Machine Press. (2008)

[13] Zhou Jin etc. A Preliminary Study on Influence of Stress Concentration on Fatigue Strength of Welding Joint. Mechanical Engineering and Automation. .2010. 2

[14] Lan Donglin. Study on Typical Welding Joint Fatigue Property and Influence Factor of Passenger Car Bogies. A Thesis of Master's Degree of Beijing Jiaotong University, 2007. 34~35