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TECHNICAL PAPERS

On the Acoustic Nonlinearity of Solid-Solid Contact With Pressure-Dependent Interface Stiffness

[+] Author and Article Information
S. Biwa, S. Nakajima, N. Ohno

Department of Micro System Engineering, Nagoya University, Nagoya 464-8603, Japan

J. Appl. Mech 71(4), 508-515 (Sep 07, 2004) (8 pages) doi:10.1115/1.1767169 History: Received December 11, 2002; Revised January 24, 2004; Online September 07, 2004
Copyright © 2004 by ASME
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References

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Figures

Grahic Jump Location
One-dimensional wave propagation through contact interface.
Grahic Jump Location
Gaussian-modulated incident wave with center frequency 10 MHz, and the transmitted and reflected waves at the aluminum-aluminum contact interface characterized by the parameters p0=10 [MPa],m=0.5, and C=6.0×1010 [Pa−1/2 m−1]. (a), (b), (c): Incident wave amplitude 5 nm; (d), (e), (f): incident wave amplitude 20 nm. The time scales are taken with the origin at the center of each wave packet.
Grahic Jump Location
Amplitude spectra of the waves shown in Fig. 2. The spectral amplitudes are normalized with respect to the amplitude of the incident wave at the fundamental frequency (10 MHz).
Grahic Jump Location
(a) The power-law relation between the linear interface stiffness and the nominal contact pressure, for m=0.5 and C=6×1010 [Pa−1/2 m−1], with the experimental data by Drinkwater et al. 3 for Al-Al interface at unloading from initial loading (circles); (b) the corresponding pressure-gap relation derived thereof, where h0 is taken as the gap at 10 MPa
Grahic Jump Location
Variation of the transmission and reflection coefficients with the nominal contact pressure, for different fundamental frequencies
Grahic Jump Location
Variation of (a) nonlinearity parameter β1 and (b) nonlinearity parameter γ1 with the nominal contact pressure, for different fundamental frequencies
Grahic Jump Location
Variation of the nonlinearity parameter β2 with the nominal contact pressure, at 5 MHz fundamental frequency. Solid line: present model, broken line: low-pressure asymptotic form, circles: experimental data by Buck et al. 9. The parameters are scaled with respect to the value at 10 MPa.

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