The article presents the results of experimental studies of the ripping resistance force on a tracked bulldozer-ripper manufactured by the Chelyabinsk Tractor Plant. The experiment covers three ripping depths and eight angles. It has been experimentally established that the dependence of the ripping resistance force on each of these parameters is quadratic. The authors propose the use of a complex parameter which is equal to the product of the ripping depth by the angle when studying the ripping process. The use of the complex parameter for two-factor analysis allowed them to reduce the degree of the studied dependence while preserving the required accuracy. The complex parameter reflects the relationship between the design parameters of the ripper tooth, the ripping depth, and angle.

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In this paper, we propose one of the approaches to assess the load-bearing capacity of metal structures for an arbitrary type of failure based on the use of interpolation-type criteria based on the principle of boundary interpolation. This approach allows for the standardization of defects taking into account their location, sharpness at the top, as well as the properties of the base metal or welded joints. The use of the calculated calculated ratios that have been experimentally confirmed during the testing of welded joints with surface defects allows us to estimate the range of their admissible sizes that do not lead to a decrease in operating loads acting on welded metal structures during their operation, proceeding from ensuring the required level of allowable stresses. This range of permissible defect sizes is determined by a number of parameters characterizing the type of defect, the mechanical properties of the weld metal, the type, stiffness and concentration of the stressed state, the thickness of the metal structures, the operating conditions (temperature T), and the accepted safety factor.

The paper deals with a method of controlling stretching reactive stresses in reinforced concrete constructions. These deformations are caused by pool welding with forced weld formation in fabricated forms. This method does not require precise measuring and labour-intensive preparatory efforts and experiments. Reactive stresses are experimentally determined after welding the protruding bars of rigid reinforced constructions. The concentrator is used outside the heat-affected area (i.e. far from the welded joint). Reactive strains are determined on the basis of the calculated connection between the level of reactive stresses σw and the limiting cut depth lc. This method is used to determine the level of reactive stresses in the protruding bars of reinforced concrete constructions after certain modes of welding and to establish the optimum welding conditions to obtain the required values of reactive stresses σw.