Fracture Performance of Progressively Drawn Pearlitic Steel under Triaxial Stress States

We study fracture processes in specimens with axially symmetric notches made of prestressed steels with various degrees of cold drawing of the wire. For this purpose, we use steel samples drawn to the required degrees. The intensity of drawing or the level of strains (characterized by the yield limit) is used as the main parameter of the technological treatment of the material. In specimens with notches of various shapes, we analyze the role of triaxiality of stresses. Special attention is given to the behavior of the sensitivity of the wire to notches as a function of triaxiality of stresses and the yield limit. The changes caused by the anisotropy of strength formed as a result of cold drawing are studied on the microscopic level.