Finite element and discrete element coupled shot peening strengthening numerical simulation method considering surface roughness

Abstract

The invention relates to a shot peening strengthening numerical simulation method considering coupling of a finite element and a discrete element of surface roughness, which comprises the following steps: (1) establishing an autocorrelation function based on Gaussian distribution to represent the real surface roughness of a part, and extracting data information of the surface roughness by using MATLAB mathematical software; (2) importing the data information of the surface roughness into PROE three-dimensional modeling software, carrying out surface smoothing treatment through fitting, and establishing a three-dimensional shell model for representing the surface roughness of the part; (3) importing the three-dimensional shell model into ABAQUS finite element software, and establishing a part finite element model considering the surface roughness on an ABAQUS / CAE platform; (4) by modifying the inp file of the ABAQUS, creating a particle generator, establishing a discrete element model of the shot flow in the shot peening strengthening process, and controlling related parameters of the shot flow according to actual shot peening working conditions; and (5) utilizing an ABAQUS / Expressexplicit dynamics algorithm to carry out shot peening numerical simulation calculation considering coupling of a finite element and a discrete element of the surface roughness in the shot peening process of the part.

Description

technical field [0001] The present invention is a numerical simulation method of shot peening intensification considering surface roughness coupled with finite element and discrete element, which not only considers the effect of target surface roughness on the residual stress of shot peening, but also considers the impact of random discrete projectiles on Effects of shot peening, belonging to the field of aerospace surface engineering. Background technique [0002] The structure and working conditions of aerospace components are complex, especially aeroengine blades, transmission beams, compressor discs and blades are prone to fatigue fracture and wear failure. Shot peening is a surface strengthening technology widely used in the aviation industry at home and abroad, which can be used to improve the fatigue performance and life of materials. After shot peening, the surface of the material will be plastically deformed, and high residual stress will be formed on the surface. ...

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Problems solved by technology

[0003] Existing literature "Ahmad A S, Wu Y, Gong H. Coupled finite and discrete elementshot peening simulation based on Johnson–Cook material model [J]. Proceedings of the Institution of Mechanical Engineers Part L Journal of Materials Design and Applications, 2020(5): 146442072092121." Based on ABAQUS software, the coupling shot peening of finite element and discrete element was established, but the target surface roughness was not established, so its influence on residual stress was not considered; "LechunXie, Jiong Zhang, CenboXiong, Lihong Wu, Chuanhai Jiang , WeijieLu. Investigation on experiments and numerical modeling of the residual stress distribution in deformed surface layer of Ti-6Al-4V after shot peening[J].Materials and Design, 2012, 41." Based on ABAQUS software to establish finite element shot peening, through The position of the projectile and the target is directly established, so the influence of the randomness of the projectile on the residual stress is not considered

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