Reverse identification method of residual stress distribution of titanium alloy thin-walled parts based on deformation test

Abstract

The invention discloses a method for reverse identification of residual stress distribution of titanium alloy thin-walled parts based on deformation test: step 1, establishing an end milling residual stress hyperbolic tangent function model; corresponding end milling parameters to the end milling residual stress hyperbolic In the tangent function model, the mapping relationship between the two is established; step 2, according to the hyperbolic tangent function model of the end milling residual stress in step 1, the induced bending moment model of the end milling residual stress of thin-walled parts is established, thereby deriving the end milling Theoretical deformation deflection of residual stress, establish the corresponding relationship between the end milling residual stress hyperbolic tangent function model and the theoretical deformation deflection; The mapping relationship obtained in step 1 and the corresponding relationship obtained in step 2 establish a reverse identification algorithm for milling residual stress. It solves the problem that the existing residual stress polynomial characterization model is difficult in practical application.

Description

technical field [0001] The invention belongs to the field of residual stress deformation control of titanium alloy cutting, and in particular relates to a reverse identification method of residual stress distribution of titanium alloy thin-walled parts based on deformation test. Background technique [0002] Due to the advantages of good comprehensive mechanical properties and process properties, titanium alloys are mainly used to make special load-bearing parts with large loads and high temperatures in aircraft structures, such as engine load-bearing frames, pylons, and landing gear compartment frames. Under the joint action of various factors, residual stress will inevitably be generated when titanium alloy is processed and applied. The formation of processing residual stress is the plastic deformation of the internal part of the material under the joint action of mechanical force and thermal effect. Due to the uncoordinated change in the volume of the metallographic struc...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a reverse identification method of residual stress distribution of titanium alloy thin-walled parts based on deformation test, so as to solve the problem that the existing polynomial representation model of residual stress is difficult in practical application

Images