Characterization of the strain-amplitude and frequency dependent damping capacity in the M2052 alloy

Abstract

In order to reveal the damping behavior of M2052 alloy dependent on the strain-amplitude and frequency, a centrally excited beam sample was used in free-decaying and frequency sweeping damping measurement. The decaying oscillations and the resonant peaks were obtained directly by the surface strain of the sample. Frequency sweeping was conducted at the strain-amplitudes of 1 × 10-5 ∼ 1 × 10-4, and frequencies between 50 and 4000 Hz. The loss factor results were described in a contour map as the function of both strain-amplitude and frequency. Logarithmic decrement and loss factor were also obtained from the free-decaying oscillations at the first resonant frequency and different strain-amplitudes. The damping capacity of the alloy at larger strain-amplitudes could be also affected by the damping mode.