2012 Fiscal Year Final Research Report
In-process Control of Distribution of Weld Residual Stress and Improvement of Structural Soundness
| Project/Area Number |
23760096
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Osaka University |
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Principal Investigator |
OKANO Shigetaka 大阪大学, 大学院・工学研究科, 特任助教 (00467531)
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| Project Period (FY) |
2011 – 2012
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| Keywords | インプロセス制御 / 溶接残留応力 / 後方冷却法 / 非破壊応力計測 / 数値シミュレーション / 封止溶接 / 破壊力学パラメータ / 構造健全性評価 |
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| Research Abstract |
In-process control welding with a trailing heat-sink for reducing welding-induced residual stress was developed. The effect of cooling conditions on the reduction of residual stress was investigated by numerical simulation. After that, the reduction of residual stress was verified quantitatively by measurement experiment. Furthermore, appropriate seal welding conditions for controlling weld residual stress at the remaining crack tip regionwas theoretically and analytically derived. In addition, using the fracture mechanics parameter, the usefulness of control of weld residual stress distribution for improving the structural soundness at repair weld was clarified.
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