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

In this article, is to develop a physical and mathematical model of the process under complex asymmetric loading in conditions of single-area and two-area deformation zone during plastic processing of medium-thickness strips. The stress state in case of loss of stability during rolling of strips of medium thickness was investigated. The patterns of changes in the stress state of the strip under conditions of reach of the limiting deformation zone, as well as the effects of plastic shaping determined by a decrease in contact stresses under conditions of increasing deformation loading, are revealed. The described method is a visual approach to assessing the stress state of a plastic medium under conditions of complex interaction and asymmetric loading.

The technology of work in some industrial enterprises involves the using of the heavy lifting machines moving on a special railway track. The type and dimensions of the gantry crane and the crane track are in accordance to the size and weight of the processed loads and the final product. The gantry cranes and the crane tracks usually work outdoors in all weather conditions and aggressive environmental influences. Most of these facilities were built 30 ÷ 40 years ago. During this period the regulations and requirements for their operation have been changed. Digital technologies now allow more precise modeling and calculation of the structure of the crane track, as well as inspection the impact of individual elements on the stress state of the structure as a whole.
The effect of the present study will have the greatest impact on loading and unloading platforms in railway stations, harbors and intermodal terminals.

The paper presents a review of the most important triaxial testing machines and triaxial specimens from literature. It also includes a finite element analysis of a triaxial specimen. The main feature that is studied refers to the geometry of the specimen so that it is obtained a state of stress as favourable as possible for the fracture to occur.