Fatigue Damage Accumulation of Welded Bridge Member during Crack Growth Propagation with Initial Crack |
| Journal |
Key Engineering Materials (Volumes 353 - 358) |
| Volume |
Progresses in Fracture and Strength of Materials and Structures |
| Edited by |
Yu Zhou, Shan-Tung Tu and Xishan Xie |
| Pages |
24-27 |
| DOI |
10.4028/www.scientific.net/KEM.353-358.24 |
| Online since |
September, 2007 |
| Authors |
Tai Quan Zhou,
Tommy Hung Tin Chan
|
| Keywords |
Crack Growth, Fatigue Damage, Fatigue Life, Initial Crack, Welded Bridge Members |
| Abstract |
The crack growth behavior and the fatigue life of welded members with initial crack in
bridges under traffic loading were investigated. Based on existed fatigue experiment results of
welded members with initial crack and the fatigue experiment result of welded bridge member
under constant stress cycle, the crack keeps semi-elliptical shape with variable ratio of a/c during
crack propagation. The calculated method of the stress intensity factor necessary for welded bridge
member crack propagation was discussed. The crack remained semi-elliptical shape with variable
ratio of a/c during crack propagation. The fatigue crack propagation law suitable for welded steel
bridge member fatigue crack propagation analysis was deduced based on the continuum damage
mechanics and fracture mechanics. The proposed fatigue crack growth model was then applied to
calculate the crack growth and the fatigue life of existed welded member with fatigue experimental
result. The calculated and measured fatigue life was generally in good agreement, at suitable initial
conditions of cracking, for welded member widely used in steel bridges. |
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