Modeling Fracture of Nanostructured Bioactive Coatings on Ti-based Materials under Contact Loading

Abstract

Modeling deformation and fracture of bioactive coating on Ti-based material is performed using movable cellular automaton (MCA) method. MCA is a new efficient numerical method in particle mechanics, which assumes that any material is composed of a certain amount of elementary objects interacting among each other according to many-particle forces. The mechanical properties of the model coating correspond to multifunctional bioactive nanostructured film (TiCCaPON) and the properties of the substrate correspond to nanostructured titanium. First, MCA method is applied to modeling nanoindentation of the coating. Indentations of diamond Berkovich tip for different depth of penetration are studied. The second testing technique which is considered for simulation using MCA method is a scratch test, in which an indenter moves across the surface after penetration. The third technique is an impact loading test. This test assumes periodic penetration of spherical counter-body into a coating with velocity about 10 m/s which leads to fracture of the coating. The calculation results are compared with available experimental data.