What is it about?
The accurate determination of the emitted S-wave arrival time at the piezoelectric receiver of laboratory triaxial cells is challenging due to the complex preceding P and S wave pattern. We model the coupled electro-mechanical process of wave propagation from the piezoelectric transducer to the receiver in a laboratory triaxial cell, with the aim of clearly identifying the arrival time of the S-wave. The numerical algorithms are validated against 1-D simulations, and against an exact solution constructed with the method of characteristics.
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Photo by Pawel Czerwinski on Unsplash
Why is it important?
We present a novel approach for simulating ultrasonic propagation tests, which involves solving the fully coupled electro-mechanical problem at the transducers using the spectral finite element method (SFEM). We accurately predict the arrival time and signature pattern of S-waves. We found that the signature pattern is mainly influenced by the experimental setup geometry and the internal structure of the actuator, rather than the nature of the specimen being tested.
Perspectives
I hope this article will help strengthen the relationship between experimentalists and numerical analysts in the field of geophysics. The idea is to establish numerical laboratories to guide the setup and interpretation of physical experiments.
Alvin Biyoghe
Imperial College London
Read the Original
This page is a summary of: Simulations of S-waves from the piezoelectric source to the receiver to assist in laboratory measurements of rock properties, Geophysics, January 2024, Society of Exploration Geophysicists,
DOI: 10.1190/geo2023-0369.1.
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