Predicting method of titanium alloy shot peening strengthening remnant stress field

Abstract

The invention relates to a predicting method of a titanium alloy shot peening strengthening remnant stress field. According to the method, the titanium alloy shot peening strengthening remnant stress field is predicted based on a characteristic parameter and a cosine attenuation function. The method mainly comprises the first step of determining a characteristic parameter model of the shot peening strengthening remnant stress field; the second step of determining a cosine attenuation function model of the shot peening strengthening remnant stress field; the third step of determining controlling factors of the remnant stress field and a shot peening strengthening technological parameter relational model; the fourth step of selecting a technological parameter of the shot peening strengthening and conducting coding; the fifth step of designing a testing scheme and conducting a shot peening strengthening test; the sixth step of testing the remnant stress field; the seventh step of solving the characteristic parameter model of the remnant stress field; the eighth step of solving the controlling factors of the remnant stress field and the like. According to the predicting method of the titanium alloy shot peening strengthening remnant stress field, the technological parameter of the shot peening strengthening is adopted as an input condition, solution is conducted through a model coefficient, and then the depth distribution condition along subsurface of the remnant stress under the technological parameter of the shot peening strengthening can be obtained; the predicting method is simple and reliable, the predicting speed is fast, the accuracy is high, a large number of complicated tests are omitted, difficulties of a finite element method and a physical analytical method are avoided, and the method is applicable to extensive engineering and technical staff.

Description

Technical field [0001] The invention belongs to the technical field of shot peening strengthening of metal material surfaces, and specifically relates to a method for predicting the residual stress field of TC17 titanium alloy shot peening strengthening based on characteristic parameters and cosine decay function. Background technique [0002] Fatigue is the most extensive and representative failure mode of aviation and other weapon equipment components. Because fatigue failure has the characteristics of low stress and no macroscopic deformation, it is more dangerous than static failure, and it is a failure mode that threatens the safe use of aviation weapons and equipment. The greatest advantage of high-strength alloys is that they have high strength and high inherent fatigue strength, but its prominent weakness is that fatigue performance is sensitive to stress concentration, and the higher the strength, the greater the sensitivity. In order to improve the fatigue performance ...

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Problems solved by technology

[0008] The present invention aims at the problems of difficulty in controlling the residual stress field, heavy testing workload, and poor prediction accuracy in the above-mentioned existing shot peening technology, and proposes a titanium alloy shot peening residual stress field based on characteristic parameters and cosine attenuation function Prediction method to realize the prediction of the residual stress field of titanium alloy shot peening, and then guide the selection of titanium alloy shot peening process parameters

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