金属細線の疲労損傷の交流電位差法による検出とその実体のデジタルマイクロスコープによる観察(<特集>マイクロマテリアル)

概要

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Fatigue tests of thin wires made of commercially pure iron or aluminum were conducted in air. The fatigue dam-age of the Materials was successfully measured with either an A. C. potential method or a digital microscope. For the A. C. potential method, constant current of 600mA with 888Hz was applied to the specimen. In pure iron, the value of electric potential was increased for a specimen whose diameter was 0.20mm, however it was almost constant for a specimen of 0.60mm in diameter. In pure aluminum, the value of potential was increased for every specimen diameter. In this Material also the change of A C. potential was larger for smaller specimens. The change of A C. potential value was detected before the specimen deformation observed with the digital microscope. Two types of fracture morphology were observed with digital microscope. Those were with or without fatigue cracks. In the latter case, the specimen was necked at the final stage of fatigue process.
2005-10-15