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Damping Characterization of Bulk Nanostructured Nickel Using an Innovative Circle-Fit Approach: Effect of Frequency

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Abstract:

In the present study, elemental Ni powder was mechanically milled (MMed) for 10 hours to reduce the grain (crystalline) size in the nano-range (<100nm). The mechanically milled powder (10h-MMed) was consolidated by die-cold compaction and was further hot extruded at high temperatures to maintain a crystallite size within the nano range. Further, the specimen was tested by a novel free-free type suspended beam arrangement, coupled with circle-fit approach to determine damping characteristics. To vary the resonant frequency of the suspended beam, end masses with different weights were added. The characterization results revealed that the nano-size grains exhibit increased damping compared to a coarse-grained sample, under similar vibration frequency. Results also show that the damping capacity of both nano and coarse grained samples decreases with an increase in frequency of vibration. Particular emphasis was placed to correlate the damping capacity with the process induced residual stresses present in the samples.

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Periodical:

Journal of Metastable and Nanocrystalline Materials (Volume 23)

Pages:

155-158

DOI:

https://doi.org/10.4028/www.scientific.net/JMNM.23.155

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Online since:

January 2005

Authors:

Narasimalu Srikanth, Maung Aye Thein, Manoj Gupta

Keywords:

Anelasticity, Damping, Nanocrystalline Material, Nickel Ni, Plasticity

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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