Abstract
In general anisotropic inhomogeneous elasticity, disturbances propagate along rays which are neither straight nor perpendicular to the wave fronts, but, as in optics, they are still characterized by their rendering the time of travel between two points stationary.
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Department of Mechanical Engineering
Department of Mathematics and Statistics
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Epstein, M., Śniatycki, J. Fermat's principle in elastodynamics. J Elasticity 27, 45–56 (1992). https://doi.org/10.1007/BF00057859
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DOI: https://doi.org/10.1007/BF00057859