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RESEARCH PAPERS: Vibration and Sound

Dynamic Green’s Function of Finite Media by Finite Difference Method

[+] Author and Article Information
Y. Fukunaga, M. Enoki, T. Kishi, J. Kihara

Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153, Japan

J. Vib. Acoust 112(1), 45-52 (Jan 01, 1990) (8 pages) doi:10.1115/1.2930097 History: Received May 24, 1988; Online June 17, 2008

Abstract

A three-dimensional finite difference method (FDM) has been developed for the computation of elastic wave propagation in finite media containing a macrocrack, with a new treatment of boundary conditions of surfaces. The method can be used for the simulation of dynamic Green’s functions of an arbitrary rectangular parallelepiped medium with a macrocrack such as a compact tension (CT) specimen. The validity of the method has been confirmed by comparison with theoretical solutions of the plate problem for a monopole source and a double source. The method was then applied to the computation of Green’s functions for a seismic moment in CT specimen. Evaluation of Green’s function by this three-dimensional FDM leads to more accurate acoustic emission (AE) source characterization.

Copyright © 1990 by The American Society of Mechanical Engineers
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