© 2003 by Oxford University Press
Exact Solutions for Axially Varying Three-Dimensional Twist Motion in a Neo-Hookean Solid
( 1 Department of Mathematics, Michigan State University, East Lansing, MI 48824, USA 2 Department of Mechanical Engineering, Michigan State University, East Lansing, MI 48824, USA 3 Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA )
Motions in a neo-Hookean material that correspond to the coupling between twist, inflation/deflation, and contraction/elongation are examined. The analytical description is in terms of a twist function and a radial inflation function, with independent variables of time and axial distance. The governing system is found to integrate to a nonlinear second-order system of two partial differential equations, one of which contains an arbitrary function of time. The system gives rise to analytical solutions corresponding to various specialized motion classes involving either special assumptions on the twist or, alternatively, a similarity variable relation between the time and space coordinates. In general, the motions presented involve variation of all three principal stretches in both space and time.
Received 7 January 2002. Revised 31 July 2002.