An application of the differential thermographic technique for welded joints fatigue evaluation

2006 ◽  
Author(s):  
Caterina Casavola ◽  
Umberto Galietti ◽  
Damiano Modugno ◽  
Carmine Pappalettere
Keyword(s):  
Welded Joints ◽  
Fatigue Evaluation

Fatigue Design and Evaluation of Head to Skirt Welded Joint of a Pressure Swing Adsorber Vessel

2011 ◽  
Author(s):  
Mingxin Zhao
Keyword(s):  
Cyclic Loading ◽  
Welded Joints ◽  
Evaluation Method ◽  
Welded Joint ◽  
Evaluation Process ◽  
Pressure Vessels ◽  
Practical Case ◽  
Pressure Swing ◽  
Fatigue Evaluation ◽  
Selection Of

For pressure vessels and other welded structures subjected to cyclic loading conditions, fatigue failure of welded joints has been a major concern in design and operation. ASME Boiler and Pressure Vessel Code Section VIII Division 2 [1] provides different methods for fatigue evaluation on welded joints with various geometries, which facilitates the design and evaluation of welded joints subjected to cyclic loading. The selection of fatigue evaluation method will affect accuracy and outcome. This study attempts to demonstrate the design and evaluation process of a welded joint. Two major different fatigue evaluation methods have been used and results are analyzed and compared against operation data. The intention of this study is simply to present a practical case, through which proper selection of fatigue evaluation method for the specific welded joint could be suggested to achieve a safe, and yet, economical design.

scholarly journals Impact of train-induced vibration on railway cable-stayed bridges fatigue evaluation

2016 ◽  
Vol 11 (2) ◽  
pp. 102-110 ◽  
Author(s):  
Shiling Pei ◽  
Yongle Li ◽  
Yulong Bao ◽  
Xin Li ◽  
Shizhong Qiang
Keyword(s):  
Fatigue Damage ◽  
Welded Joints ◽  
Moving Load ◽  
Numerical Procedure ◽  
Coupled System ◽  
Accurate Estimation ◽  
Truss Bridges ◽  
Cumulative Fatigue Damage ◽  
Fatigue Evaluation ◽  
Critical Locations

Under repetitive heavy train traffic, railway steel truss bridges tend to have many fatigue related performance issues, especially at welded joints. Accurate estimation of the stress history at critical locations of welded joints under vehicle loading is important for joint fatigue design. Traditionally, vehicle loads were treated as moving static loads without considering their dynamic effects. In this study, a numerical procedure was introduced to incorporate the effect of dynamic response of the train–bridge coupled system on nodal fatigue damage. The proposed approach employs a twolevel modelling scheme which combines dynamic analysis for the full train-bridge system and detailed stress analysis at the joint. Miner rule was used to determine the cumulative fatigue damage at critical locations on the welded joint. A sensitivity analysis was conducted for different train loading configurations. It was determined that dynamic vibration negatively influences fatigue life. The calculated cumulative damage at investigated locations can more than the damage estimated using only static moving load method.

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