The dynamic perturbation of a neo-Hookean solid in an initial equilibrium state of
finite deformation can be viewed as the superposition of infinitesimal strains upon
large ones. Three transient 3D singular problems whose solutions are useful in
generating the former are studied. The first and second concern, respectively, a
concentrated force and a point displacement discontinuity in an unbounded solid; the
third problem involves a concentrated force applied at a point on the surface of a
half-space. The governing equations resemble those for a linear anisotropic solid.
Analytic solutions are obtained, as well as formulas and calculations for anisotropic
wave speeds. Formulation of the problems is in terms of Cartesian coordinates, but
expressions for the solutions and wave speeds make use of a quasipolar coordinate
system.
Keywords
neo-Hookean, dynamic perturbation, 3D singular solution,
transient
