2023 Fiscal Year Annual Research Report
渦電流磁気指紋法を用いた電磁鋼板における残留応力と損失の評価
| Project/Area Number |
22KJ0263
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| Allocation Type | Multi-year Fund |
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| Research Institution | Tohoku University |
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Principal Investigator |
張 書睿 東北大学, 流体科学研究所, 特別研究員(PD)
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| Project Period (FY) |
2023-03-08 – 2024-03-31
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| Keywords | non-destructive testing / magnetic properties / elastic stress / plastic strain / iron loss |
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| Outline of Annual Research Achievements |
1. Magnetic Behavior Analysis and Quality Testing: This study explores magnetic behaviors related to hysteresis loss in low-frequency ranges under stress-free conditions. Utilizing a low-frequency magnetic field isolates frequency-dependent iron loss, focusing on hysteresis loss evaluation. The reliability of hysteresis loss calculations was validated, proposing a methodology combining Magnetic Incremental Permeability (MIP) and BH curves. A dynamic-to-quasi-static transition threshold of 20 mHz was identified.
2. Elastic Stress Dependency of Magnetic Behaviors:This study investigates the elastic stress dependency of magnetic behaviors, focusing on micro-magnetic structures. Measurements using techniques like hysteresis curve analysis, Magnetic Barkhausen Noise (MBN), and MIP signals were conducted. Specific indicators plotted against elastic stress establish correlations, revealing changes in domain walls and pinning site strength.
3. Evaluation of Plastic Strain Effects:This study evaluates indicators sensitive to plastic strains across five electrical steel specimens. Comparative analysis identifies indicators with linear relationships with plastic strain or its square root. Notably, some indicators exhibit potential to predict plastic strian.
4. Reproducibility of Indicator Analysis:This research examines reproducibility of indicators sensitive to both elastic stress and plastic strain across different grades of electrical steel. Common indicators, particularly MIP and MBN, show significant linear correlations with both elastic stress and plastic strain.
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