On chiral effects in strain gradient elasticity

• In the context of the strain gradient theory of elasticity we study the deformation of a chiral cylinder.
• We investigate the behavior of a cylinder subjected to body forces, lateral tractions and resultant forces and moments on the ends.
• The deformation of a chiral circular cylinder subjected to a constant pressure on the lateral surface is investigated.
• A uniform pressure acting on the lateral surface produces a twist around its axis.

This paper is concerned with the problem of uniformly loaded bars in strain gradient elasticity. We study the deformation of an isotropic chiral bar subjected to body forces, to tractions on the lateral surface and to resultant forces and moments on the ends. Examples of chiral materials include some auxetic materials, bones, some honeycomb structures, as well as composites with inclusions. The three-dimensional problem is reduced to the study of some generalized plane strain problems. The method is used to study the deformation of a uniformly loaded circular cylinder. New chiral effects are presented. The flexure of a chiral cylinder, in contrast with the case of achiral materials, is accompanied by extension and bending. The salient feature of the solution is that a uniform pressure acting on the lateral surface of a chiral circular elastic cylinder produces a twist around its axis.