Simulation of deformation and fracture processes in nanocomposites

Abstract

The paper studies the processes of deformation and fracture in nanocomposites. The study was carried out by the method of mathematical modeling. The behavior of the nanosystem was described by the molecular dynamics apparatus. A modified immersed atom method was used as a potential. Demonstrated theoretical approaches to the study of the mechanical properties of nanocosposites and the processes of their failure. Formulas for calculating the stress, strain tensors and displacement were given. To maintain a constant temperature in the nanosystem, a Nose-Hoover thermostat was used. The failure of nanocomposites was considered in the process of tension and shear deformation. Pure aluminum, a composite with an aluminum matrix and a filler in the form of spherical iron particles, and a composite with an aluminum matrix and a filler in the form of a cylindrical iron fiber were used as samples. After the filler was introduced into the nanocomposite, the sample was relaxed to ensure its more stable state. The simulation allowed us to establish the basic laws of changes in the atomic structure of the matrix and nanocomposite fillers during deformation and fracture. It is shown that the processes of deformation and failure of nanocomposites substantially depend both on the structure and types of loading of the material. The results of the research can be used to study the processes of deformation of nanocomposite materials with promising functional properties.

Molecular dynamics modeling of formation processes parameters influence on a superconducting spin valve structure and morphology

“…The aim of this work, as the development of previous studies of the authors on the modeling of various nanosystems [18][19][20], including for spintronics [21][22], was to study the influence of the main parameters of technological modes of the formation of layered nanosystems for spintronics: temperature, concentration and spatial distribution of deposited atoms over the surface of the nanosystem -on their structure and morphology.…”

Molecular dynamics modeling of the influence forming process parameters on the structure and morphology of a superconducting spin valve

“…This work presents the advancements in our previous studies on the modeling of various nanosystems [26][27][28][29], including spintronic studies [30][31][32], where the aim was to investigate the influence of selected technological parameters (substrate temperature, concentration and spatial distribution of the deposited atoms over the interface) on the structure and morphology of the layered nanosystem.…”