2019 Fiscal Year Final Research Report
Non-destructive estimation of three-dimensional residual stresses using X-ray diffraction
| Project/Area Number |
17K06044
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Kogakuin University |
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Principal Investigator |
Ogawa Masaru 工学院大学, 工学部, 准教授 (90635236)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Keywords | 逆問題 / X線回折 / 残留応力 / 溶接 / 摩擦攪拌接合 / 固有ひずみ / 有限要素法 / 疲労 |
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| Outline of Final Research Achievements |
If residual stresses of the product can be estimated non-destructively, it is possible to estimate the safe remaining lifetime. We have proposed a non-destructive technique for estimating three-dimensional residual stresses using portable X-ray diffractometers. This study aims to demonstrate the effectiveness of this method for actual joints.
In this study, residual stresses of a friction stir welded plate are estimated using the proposed method. We also worked on improving the estimation accuracy of the proposed method using a welded joint.
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| Free Research Field |
機械材料・材料力学
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| Academic Significance and Societal Importance of the Research Achievements |
これまで，専用の施設でしか，内部の残留応力分布を非破壊に評価することができなかったが，本手法により，可搬型のＸ線回折装置を用いて，現場で完全非破壊に残留応力分布を推定することができることを示すことができた．これにより，抜き取り検査を行うことなく，製品の余寿命を予測することができる．また，本手法は数値シミュレーションのような定性評価とは異なり，定量評価を行うため，製品の個体差を評価することができる．
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