| HE Bo-lin,WEI Kang.FEM Analysis of Stress Concentration Coefficient of SMA490BW Steel Welded Butt Joint for Bogie[J],44(10):74-78 |
| FEM Analysis of Stress Concentration Coefficient of SMA490BW Steel Welded Butt Joint for Bogie |
| Received:May 27, 2015 Revised:October 20, 2015 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2015.10.013 |
| KeyWord:butt joint stress concentration coefficient weld toe finite element |
| Author | Institution |
| HE Bo-lin |
College of Mechanical and Electrical Engineering, East China Jiaotong University, Nanchang , China |
| WEI Kang |
College of Mechanical and Electrical Engineering, East China Jiaotong University, Nanchang , China |
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| Abstract: |
| Objective To analyze the stress concentration coefficient of SMA490BW steel butt joint for bogie, which has an important significance for improving VHCF properties of bogie welded structure and ensuring the safe, reliable operation of high-speed train. Methods Finite element model of very high cycle fatigue sample of SMA490BW steel butt joint for bogie was built. The influences of joint geometric parameters (weld edge transition arc radius r,weld toe inclination angle θ) on stress concentration coefficient Kt of weld toe were studied based on the finite element software ABAQUS, and the relationship between the stress concentration coefficient and the geometric parameters was analyzed and established based on regression analysis of Origin software. Results When the weld edge transition arc radius r was 0. 2 mm, the stress concentration coefficient Kt was 1. 391, 1. 747, 1. 976, 2. 263, 2. 425, 2. 525 respectively at weld toe inclination angle θ of 10°, 20°, 30°, 40°, 50°, 60°; when the weld toe inclination angle θ was 30°, the stress concentration coefficient Kt was 1. 976, 1. 763, 1. 535, 1. 419, 1. 345, 1. 306, 1. 257, 1. 201 respectively at weld edge transition arc radius r of 0. 2, 0. 5, 1, 1. 5, 2, 2. 5, 3, 4 mm. Conclusion Stress concentration at weld toe of butt welded joint was relatively large, and weld edge transition arc radius r and weld toe inclination angle θ played important roles in stress concentration coefficient Kt. For the same weld edge transition arc radius r, the stress concentration coefficient Kt at weld toe increased with increasing inclination angle θ. While in the case of the same weld toe inclination angle θ, the stress concentration coefficient Kt at weld toe decreased with increasing transition arc radius r. The stress concentration coefficient equation has a guiding significance to the improvement of stress concentration at weld toe and the design of ultrasonic fatigue sample of butt joint for bogie. |
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