研究目的
To identify factors affecting the magnetostriction measurement and to estimate the reproducibility of the measurements using several test apparatuses.
研究成果
The reproducibility of the measurements characterized by relative standard deviations of λp-p at this RRT are estimated as 4.6% for 0.35 mm thick CGO in the L direction at 1.7 T, 4.7% for 0.23 mm thick HGO in the L direction at 1.7 T, and 1.5% for 0.23 mm thick HGO in the C direction at 1.4 T. There is room to improve the reproducibility by matching the test apparatuses to the draft standard and improving the specifications of the test apparatus in the draft standard.
研究不足
The test apparatuses used in the RRT had some differences from the draft standard, which may affect the reproducibility of the measurements. The slight air-gap under a test specimen and insertion sheet and the base length of measurement were identified as factors affecting the measurement.
1：Experimental Design and Method Selection:
The RRT was conducted using test apparatuses following IEC 60404-17. The main purpose was to identify factors affecting the magnetostriction measurement and estimate the reproducibility of the measurements.
2：The main purpose was to identify factors affecting the magnetostriction measurement and estimate the reproducibility of the measurements.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Three kinds of GO test specimens were selected for the RRT. The test specimens were taken from continuous strips to have similar magnetostriction.
3：List of Experimental Equipment and Materials:
The test apparatuses included a single sheet tester and an optical sensor. All laboratories used a laser Doppler vibrometer for an optical sensor.
4：Experimental Procedures and Operational Workflow:
The test conditions included a test frequency of 50 Hz, test magnetic polarization (Jp) of 1.5 and 1.7 T in the longitudinal direction to the rolling direction, and 1.3 and 1.4 T in the longitudinal direction to the cross direction of the rolling direction. The magnetostriction was expressed as the peak-to-peak value λp-p, the zero-to-peak value λ0-p, and numerical data for the typical butterfly loop.
5：5 and 7 T in the longitudinal direction to the rolling direction, and 3 and 4 T in the longitudinal direction to the cross direction of the rolling direction. The magnetostriction was expressed as the peak-to-peak value λp-p, the zero-to-peak value λ0-p, and numerical data for the typical butterfly loop.
Data Analysis Methods:
5. Data Analysis Methods: The validity of the measurement was verified with butterfly loops of the GO material in the C direction. The phase delay of the magnetostriction strain to the magnetic polarization was analyzed.
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