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Abstract. The mechanical condition and residual stresses (RS) research and computational algorithms creation in complex types of loading on the product lifecycle stages relevance is shown. The mechanical state and RS forming finite element model at surface plastic deformation strengthening machining, including technological inheritance effect, is presented. A model feature is the production previous stages obtained transformation properties consideration, as well as these properties evolution during metal particles displacement through the deformation space in the present loading step. IntroductionIt is known that the mechanical condition, such as deformation degree and first kind residual stresses (RS) -one of important metal condition parameters, which largely determines product operational life, especially in different types of alternating loads [1].However, accurate stress-strain calculation, acting in a particular part of the workpiece, it is not always possible, most of the computational methods and algorithms, as a rule, cover only simple (one-, two-axle) loading types and don't allow to perform calculations in the complex power and thermal loading types, taking place in manufacturing and operation stages processes [2].Along with it, the technological inheritance (TI) phenomenon significantly affects to the mechanical condition formation and transformation, because the workpiece stress-strain condition (SSC), obtained at the previous loading stages, influence to the flow of the processes at each subsequent stage.

Technologies of surface plastic deformation (SPD) provide a hardening effect and create compressive residual stresses in the surface layer of mining machine parts. This leads to a significant increase in the limit of endurance and fatigue cyclic life, increases the life in fretting conditions, improves the quality of assembly joints fit, etc. Very complex are both the physical nature of the occurrence and the estimation of residual stresses, since the machining processes are related to complex nonmonotonic types of loading. The study shows the relevance of the development of computational methods for determining residual stresses in the processes of hardening treatment of critical surfaces of mining machine parts. At the same time, the design and development of experimental nondestructive express methods based on the determination of various physical parameters (acoustic, magnetic noise, coercive force, etc.) are relevant and promising. A model of the process is developed and numerical calculations of the residual stresses arising during the SPD treatment are carried out. The results of the calculations are in good agreement with the experimental data.