 Research Interests S.G. Psakhie were multifaceted and covered problems of an unusually wide range.Being an outstanding material scientist he significantly contributed to development the methods of discrete mechanics and tribology, to study the laws of the processes of deformation and destruction of heterogeneous materials and nanostructures.Well-known practically important results of the work of Sergey Psakhie on obtaining special materials for space applications, on friction welding and on the study of the behavior of geological media under dynamic effects.