DOI: 10.18503/1995-2732-2022-20-4-120-128
Abstract
Problem Statement (Relevance). One of the most complicated elements in the plane design is large-size outer mold line panels and shell. Manufacturing complexity is attributed to a peculiar spatial outline, namely a combination of zones of fluctuating double curvature and large size (length of such parts may be 30 m) and low stiffness. An efficient approach to manufacturing a double curvature shape is surface plastic deformation methods, namely shot peening and local treatment (flattening-out and fitting of edges). Most methods used to determine mode parameters of the processes are based on experimental studies on curvature and elongation of samples during treatment, and elasticity theory in studies on residual stresses. Objectives. The research is aimed at improving the methods used to calculate mode parameters of metal forming by surface plastic deformation. Methods Applied. finite element modeling of the surface plastic deformation process using shot peening as an example. Originality. It lies in using a concept of initial stresses, being a source of bending strain and extensional strain, to describe a shot peening processes. Results. The authors developed methods for determining the distributions of the initial stress-strain state of the surface layer of element sections of parts, and for integrating the initial stress-strain state into the surface layer of full-scale parts in order to obtain the predicted curvature of the parts in the required direction. The simulation results were compared with the available results of experimental studies on the processing of plate samples by the shot peening method. Practical Relevance. An approach of initial stresses applied to describe the shot peening process contributes to calculating mode parameters of the processes, showing no need for a large number of experimental studies. Computer simulation methods were applied to settle a range of issues aimed at increasing efficiency and quality of manufacturing outer mold line parts of a complicated shape by finding patterns of forming the stress-strain state, when processing parts.
Keywords
surface plastic deformation, metal forming, residual stresses, initial stresses, stress-strain state
For citation
Pashkov A.E., Pashkov A.A., Samoylenko O.V. Development of Initial Stresses During Shot Peening. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2022, vol. 20, no. 4, pp. 120-128. https://doi.org/10.18503/1995-2732-2022-20-4-120-128
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