交流電位差法による切欠き材での疲労き裂伝ぱの計測

概要

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An AC electrical potential system with a lock-in amplifier was developed to measure the propagation of a fatigue crack in notched specimens. A constant current of IA with a frequency of 92 Hz flowed into a single-edge notched specimen of a low-carbon steel. For a through-thickness fatigue crack longer than about I mm, the potential difference was a quadratic function of the crack length. In an accurate measurement, the potential difference and the crack length at the end of the fatigue test were needed to determine the constant in the equation. An instantaneous resolution of this system was about 3μm, and a long-term error due to drift was about 10μm. When a crack was shorter than I mm or part-through, two different quadratic equations were necessary to correlate the potential difference to the crack length. The system was successfully used to measure the crack length during the fatigue test of notched specimens.
社団法人日本材料学会の論文
1987-02-15