Transient ultrasonic wave field modeling in an elastic half-space using distributed point source method

Samik Das; Sourav Banerjee; Tribikram Kundu

doi:10.1117/12.847447

8 April 2010 Transient ultrasonic wave field modeling in an elastic half-space using distributed point source method

Samik Das, Sourav Banerjee, Tribikram Kundu

Proceedings Volume 7650, Health Monitoring of Structural and Biological Systems 2010; 76501G (2010) https://doi.org/10.1117/12.847447
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

Abstract

Transient ultrasonic waves in an elastic half-space generated by an ultrasonic transducer of finite size are modeled by the Distributed Point Source Method (DPSM). DPSM which is a Green's function based semi-analytical mesh-free technique is modified to incorporate the transient loading from a finite size acoustic transducer. Fast Fourier transform (FFT) of the transient loading is computed and then DPSM is used to compute the ultrasonic field at different frequencies and then inverse fast Fourier transform (IFFT) is taken to get the transient response of an elastic half-space excited by a bounded acoustic beam. Numerical results are generated for elastic half-space excited with normal incidence of acoustic beam. Then the transient Rayleigh wave in the solid half-space is generated. The modeling is then extended to the transient response of an elastic half-space containing a crack, struck by a bounded acoustic beam. It is discussed in the paper what type of useful information that is hidden in the steady state solution can be obtained from the transient results.

Citation Download Citation

Samik Das, Sourav Banerjee, and Tribikram Kundu "Transient ultrasonic wave field modeling in an elastic half-space using distributed point source method", Proc. SPIE 7650, Health Monitoring of Structural and Biological Systems 2010, 76501G (8 April 2010); https://doi.org/10.1117/12.847447

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