Analysis of Dilatation in a Multilayered Spherical Hydrogel

AbstractThe stresses and displacements in a dual-layer spherical hydrogel subjected to a constant dilatation in the outer layer are derived analytically. Both the inner core and the outer layer are described by a second-order nonlinear elasticity model. The results show the importance of nonlinearity, and indicate that the surface displacements or swelling and the interfacial radial or tangential stresses can be significantly moderated by a judicious choice of the elastic constants of the two layers