STUDY OF MACROPLASTIC FLOW IN THE SURFACE LAYERS OF POROUS TITANIUM NICKELIDE BY DIGITAL IMAGE CORRELATION
The mechanical behavior of porous TiNi under deformation by uniaxial stretching of samples is considered. On the basis of the deformation curve σ = f(ε), the dependence of the coefficient of deformation hardening Θ on the deformation ε is constructed. The results obtained using the Vic-3D optical system showed the prospects of research aimed at finding general patterns based on the analysis of the evolution of the distributions of deformation fields on the surface of porous alloys based on titanium nickelide under deformation effects. The revealed features of the deformation curves correlate with the change in the distributions of deformation fields on speckle patterns from the applied external uniaxial tension by stretching. An enlargement of the characteristic size of local deformation regions on speckle patterns on the surface of a 3D frame of a porous material was found with a decrease in the thickness of the samples and with their stretching from the average deformation over the working field of the sample by more than 0.005%.Based on the analysis of the deformation curves under uniaxial stretching of the samples, a stage-by-stage relationship is established, which correlates with changes in space and time in the distributions of deformation fields on the surface of the samples.