交流電位差法による短い表面き裂長さの測定

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  • Measurement of short surface crack lengths by an AC potential method.
  • コウリュウ デンイサホウ ニ ヨル ミジカイ ヒョウメン キレツ ナガサ ノ

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An alternating current (ac) potential technique was developed for the measurement of short surface cracks in smooth specimens of a ferromagnetic material. For a constant crack length, the potential difference (E0) between two probes located across the crack was found to be directly proportional to the operating ac frequency. The relation between E0 and crack length (α) changed specimen by specimen, because the value of E0 was very sensitive to placement of lead wires for potential measurement. The relation of ΔE0(=E0-E0I) vs. a, however, was uniquely determined, independent of specimen, where E0i Was the potential difference for a reference crack length, e. g., initial crack length. Therefore, surface crack lengths were able to be determined through the equation for ΔE0 vs. a. Best accuracy was obtained for the operating ac frequency of 2 kHz in this study. In fatigue crack growth tests, the potential difference (E) was found to be a function of loading conditions. In this case, the crack length was calculated with good accuracy through the equation for ΔE0 vs. a by substituting ΔE (=E-Ei) for ΔE0, where E was the potential difference under loading, and Ei was the value at reference crack length.

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