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Journal of Composite Materials
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Damping Characterization of Magnesium Based Composites Using a New Circle-Fit Approach

Narasimalu Srikanth

Samuel Chao Voon Lim

Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore–119260

Manoj Gupta

Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore–119260mpegm{at}nus.edu.sg

In the present study, a new methodology of using free–free beam method coupled with circle-fit approach is used to determine damping of ceramic reinforced magnesium composites. This technique is based on classical vibration theory, by which the geometry and material properties of the metal matrix composites are related to resonant frequency and structural damping of the test specimen. Using the fact that the ratio of the vibration response to the applied force fits to a circle in the Argand plane for each resonant frequency of the test specimen, the damping factor and natural frequency is predicted accurately for the test specimen. An attempt is made to rationalize the increase in damping capability of the MMC when compared against the monolithic specimen in terms of increase in dislocation density and presence of plastic zone at the matrix–particulate interface.

Key Words: composites • damping loss factor • circle-fit • plastic zone • dislocation

Journal of Composite Materials, Vol. 36, No. 20, 2339-2355 (2002)
DOI: 10.1106/002199802027871
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[Abstract] [PDF]