Test MethodA 3D displacement measurement methodology for anisotropic porous cellular foam materials

This paper presents a new testing methodology for three dimensional (3D) full-field displacement mapping at the surface of elastic materials under static loading, here with a special focus on macroscopic behaviour of an anisotropic porous cellular foam. Three displacement components on four adjacent surfaces are estimated for cubic samples of the foam using a dual-camera 3D image correlation system. The critical feature of the proposed method is the provision made for efficient mapping of the four visible sides of the cubic sample, involving a rotating table and a common lateral reference frame. The overall setup used is described in some detail, together with the main steps of the measurement procedure and including remarks on the experience made during the development. Observations made concerning specific deformation phenomena occurring at discontinuities are discussed.