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Numerical Evaluation of Integrals in Laplace Domain Anisotropic Elastic Fundamental Solutions for High Frequencies

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Dynamics, Strength of Materials and Durability in Multiscale Mechanics

Part of the book series: Advanced Structured Materials ((STRUCTMAT,volume 137))

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Abstract

In this paper, we address a problem of computing the integrals appearing in integral expressions of Laplace domain anisotropic elastic displacement fundamental solutions. The essence of the problem is that these integrals can become highly oscillatory for high values of frequency or large distance between source and observation points. The modified integral expressions for displacement fundamental solutions and their first derivative are given. We propose a procedure based on the quadrature rule developed by Evans and Webster for the evaluation of rapidly oscillatory integrals. For a triclinic anisotropic elastic material, we consider an illustrative numerical example which involves phase functions with stationary points.

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Acknowledgements

The work is financially supported by the Russian Science Foundation under grant No. 18-79-00082.

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Correspondence to Ivan P. Markov .

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Markov, I.P., Markina, M.V. (2021). Numerical Evaluation of Integrals in Laplace Domain Anisotropic Elastic Fundamental Solutions for High Frequencies. In: dell'Isola, F., Igumnov, L. (eds) Dynamics, Strength of Materials and Durability in Multiscale Mechanics. Advanced Structured Materials, vol 137. Springer, Cham. https://doi.org/10.1007/978-3-030-53755-5_11

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