Application of superimposed holographic interferometers in experimental mechanics

In this review paper we discuss the methods of the investigation of various problems of mechanics by means of superimposed holographic interferometers. Investigations were carried out at the Novosibirsk Institute for Engineers of Railway Transport and the Chelyabinsk Institute for Mechanization and Electrification of Agriculture. Both the traditional and new method of analyzing of interferometric patterns reconstructed from a hologram recorded at a distance of a few centimeters from the surface of an object are described. Examples are given illustrating studies of fields of elastic and plastic strains, in strips with concentrators tested for axial stress under static and cyclic (few cycles only) loading, in shell-structures under axial load as well as under internal pressure.