International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

This study investigates the influence of distance and relative orientation of semi-elliptical twin surface cracks in cylindrical bars under tensile loading on the stress intensity factors (SIF). Finite element analysis was used to analyze the interactions between two identical cracks with different spacing (5-20 mm) and rotation angles (0°-180°). The results show that the crack orientation has a significant effect on the stress distribution patterns and stress intensity factor values, with a 45° rotation producing the highest SIF values, while a parallel orientation has a favorable shielding effect with significantly lower values. All configurations gradually converge to the reference value for a single crack at larger distances (20 mm), indicating decreasing interaction effects. These results can provide insights for the assessment of structural integrity, especially for components with multiple closely spaced defects, and provide a basis for the development of more accurate predictive models for fracture behavior in engineering applications.

It was analyzed the methods of constructions the matter with maximal of packing coefficient when the objects consist of the particles with forms either spheres or rods or plates. It was calculated the relations the partial size for relating of maximal packing coefficient. As examples of objects with coefficient of packing theirs particles we look on abrasive materials and products of the powder metallurgy and solid fuel etc.

The article considers theuse of manufacturing schemes of thermomechanical processing for production of various machine parts. Schemes of machines for wire and the sized steel introduced on the industrial enterprises are given. Machineswere developed by research teamheaded by Professor Oleg .I. Shavrin at Kalashnikov Izhevsk State Technical University. Comparison of the reached parameters for the developed technologies with basis technologies of thermal processing (typical for the given details) was presented.