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

Abstract:

Article Preview

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.

Info:

Edited by:

M. Gupta and Christina Y.H. Lim

Pages:

155-158

Citation:

N. Srikanth et al., "Damping Characterization of Bulk Nanostructured Nickel Using an Innovative Circle-Fit Approach: Effect of Frequency", Journal of Metastable and Nanocrystalline Materials, Vol. 23, pp. 155-158, 2005

Online since:

January 2005

Export:

Price:

$38.00

[1] C. Suryanarayana: 1995 International Materials Review Vol. 40(2) (1995), p.41.

[2] H. Gleiter: Acta Materialia Vol. 48 (2000), p.1.

[3] J. Weissmuller: Nanocrystalline Materials - an Overview, Synthesis and Processing of Nanocrystalline powder Ed. Bourell D L (The Minerals, Metals and Materials Soceity, USA, 1996).

[4] L. Lu and M. O. Lai: Mechanical Alloying (Kluwer Academic Pub., USA, 1998) pp.165-172.

[5] N. Srikanth and M. Gupta: Materials Research Bulletin Vol. 37 (2002), p.1149.

[6] B. J. Lazan: Damping of Materials and Members in Structural Mechanics (New York: Pergamon Press, 1968).

[7] A. Buch: Pure Metals Properties - A Scientific Technical Handbook (ASM International, USA, 1999).

[8] Le Brun et al.: Scripta Matellurgica et Materialia Vol. 26 (1992), p.1743.

[9] J. Polak: Cyclic Plasticity and Low Cycle Fatigue Life of Metals, (Elsevier, Oxford, 1991).

[10] Y. M. Haddad: Mechanical Behaviour of Engineering Materials - Dynamic Loading and Intelligent Material Systems, Vol. 2 (Kluwer Academic Publishers, UK, 2000). ( )o K β σ = ε& (4).

Fetching data from Crossref.
This may take some time to load.