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Effect of frequency on amplitude-dependent internal friction in niobium

✍ Scribed by Naoki Ide; Tomohiro Atsumi; Yoichi Nishino

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
247 KB
Volume
442
Category
Article
ISSN
0921-5093

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✦ Synopsis

Amplitude-dependent internal friction (ADIF) was measured in a polycrystalline niobium using four modes of flexural vibration from the fundamental to the third-order resonance at room temperature. The ADIF was detected in each vibration mode. The internal-friction versus strainamplitude curve of the ADIF shifted to a larger strain-amplitude range as frequency increased. The stress-strain curves were derived from the ADIF data, and the microplastic flow stress defined as the stress required to produce a plastic strain of 1 Γ— 10 -9 was read from the stress-strain curves. It was found that the microplastic flow stress was proportional to the frequency.

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