The deformation of multilayers by layer-normal compression; an experimental investigation

In this paper, experiments are described which were carried out to investigate the initiation and amplification of structures which form when a multilayer is compressed normal to the layering. The multilayers were made up of either putty or paraffin wax and an attempt is made to relate the structures that form to those predicted by the various theories which consider the deformation of either a single layer, a multilayer or an anisotropic material when compressed normal or at a high angle to the layering or fabric. periments give an insight into the temporal and spatial relationships between the various types of structures that form by showing clearly how the initiation and growth of one type of structure such as a boudin can provide the local perturbation necessary for the initiation of other structures such as internal pinch-and-swell structures or normal kink bands.