Titanium alloy thin-walled workpiece residual stress distribution reverse identification method based on deformation test

Abstract

The invention discloses a titanium alloy thin-walled workpiece residual stress distribution reverse identification method based on a deformation test. The method comprises steps of 1, an end milling residual stress hyperbolic tangent function model being established; enabling the end milling parameters to correspond to the end milling residual stress hyperbolic tangent function model, and establishing a mapping relation between the end milling parameters and the end milling residual stress hyperbolic tangent function model; 2, according to the end milling residual stress hyperbolic tangent function model in the step 1, an induced bending moment model of the end milling residual stress of the thin-walled part being established so that the theoretical deformation deflection of the end milling residual stress is derived, and the corresponding relation between the end milling residual stress hyperbolic tangent function model and the theoretical deformation deflection being established; and3, measuring the residual stress of one point of the end-milled surface and the deformation deflection in different feed directions, and establishing a reverse identification algorithm of the millingresidual stress by combining the mapping relationship obtained in the step 1 and the corresponding relationship obtained in the step 2. The method is advantaged in that a problem that an existing residual stress polynomial representation model is difficult in practical application is solved.

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...

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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

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