Effect of initial stress on reflection at the free surface of anisotropic elastic medium |
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| Authors: | M D Sharma |
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| Institution: | (1) Department of Mathematics, Kurukshetra University, India, 136 119 Kurukshetra |
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| Abstract: | The propagation of plane waves is considered in a general anisotropic elastic medium in the presence of initial stress. The
Christoffel equations are solved into a polynomial of degree six. The roots of this polynomial represent the vertical slowness
values for the six quasi-waves resulting from the presence of a discontinuity in the medium. Three of these six values are
identified with the three quasi-waves traveling in the medium but away from its boundary. Reflection at the free plane surface
is studied for partition of energy among the three reflected waves. For post-critical incidence, the reflected waves are inhomogeneous
(evanescent) waves. Numerical examples are considered to exhibit the effects of initial stress on the phase direction, attenuation
and reflection coefficients of the reflected waves. The phase velocities and energy shares of the reflected waves change significantly
with initial stress as well as anisotropic symmetry. The presence of initial stress, however, has a negligible effect on the
phase directions of reflected waves. |
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| Keywords: | General anisotropy initial stress reflection |
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