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| Methods for Safety Assessment of Welding Defects for Aluminum Alloy Body Based on FAD |
| Received:July 18, 2018 Revised:December 25, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2018.12.018 |
| KeyWord:aluminum alloy welded body welding defects FAD curve safety assessment characterization of defects finite element analysis |
| Author | Institution |
| LIU Jun-jie |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
| LU Yao-hui |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
| DANG Lin-yuan |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
| XIAO Ke-yu |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
| ZHANG De-wen |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
| ZHU Sheng-chang |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
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| Abstract: |
| Objective To ensure safety of high-speed trains, it is very important to evaluate welding defects with advanced method and theory. Methods Based on combination of fracture mechanics and finite element method, a full scale finite element model of body was established. Finite element numerical simulation of welding residual stress was carried out with the therm-elastic method. The safety of welding defects was evaluated based on the assessment of welding defects provided by standard BS7910. Result For the finite element model of the body including the weld seam, the load was applied to the body according to standard BS EN12663. The primary stress was obtained by transforming stress of the weld points of interest. Ac-cording to the information of the point of interest, the finite element model of the welded joint was established. And the simulation was carried out based on the therm-elastic method to obtain the residual stress of the point of interest which is further transformed into the secondary stress. Finally, the welding defects were quantitatively in combination with the above-mentioned primary stress and secondary stress, the ratio of the load ratio to the stress intensity factor was further calculated. Combined with the FAD curve, safety of the focus points on the aluminum alloy body of the high-speed train was evaluated. Conclusion This method is feasible for evaluating the safety of a large and complex welded structure like the train body. Suggestions on quality control for the use of welding defects are proposed. |
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