Papers by Author: Yuri Gordienko

Abstract: Many crucial processes of damage initiation and propagation take place dynamically in the wide observable time domain from 10-3 seconds to 103 seconds and on the many scales from 10 6 m (solitary defects places) to 10-2 m (correlated linked network of defects). The new multiscale image and video processing method is used to observe and characterize the dynamic behavior of metals under mechanical deformation, record its surface evolution, and process the observed surface statistical parameters. The calculations include many parameters of physical process and video processing parameters (size distribution, anisotropy, localization, scaling parameters, etc.). The typical multiscale analysis of the dynamic video sequence (with 103-106 frames) of deformed metal surface (depicting it time evolution) takes approximately several weeks on a single modern processor. That is why the more powerful computational resources are in extreme need. The free high-performance grid-enabled version of the video processing software is designed and tested in our Desktop Grid (DG) distributed computing infrastructure (DCI).

Abstract: The substructure evolution was observed in the range of scales from dozens nanometers to millimeters on the surface of the aluminum single crystalline plates under restricted cyclic tension. The self-similar systems of crossing bands that create the grid-like ordered structures on different scales are assumed to be clear manifestation of their self-organization. The selforganization of these grid-like structures is assumed to be inevitably related to the crystal structure defects (dislocations, point-like defects and their ensembles). The model is proposed for explanation of 2-dimensional rectangular "tweed" and 3-dimensional rhombic "pullover" pattern formations which are related to cooperative arrangement of crystal structure defects.

Abstract: Surface analysis of the aluminum thin plates plastically deformed under constrained cyclic deformation was performed by Fourier, morphology and fractal techniques. The plates are used for estimation of deformation damage and fracture in places with a priori known homogeneous and heterogeneous strain distribution. Advantages and disadvantages of Fourier, morphology and fractal techniques for characterization of the intersections and projections are discussed in the context of its applicability to investigation of plastic deformation and fracture (persistent strain planes and directions, strain localization angles and places, etc.).