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Method for computing stress relaxation numerical values and resilience of titanium alloy

A technology of stress relaxation and calculation method, which is applied in the field of material thermal processing, can solve the problems of creep relaxation research difficulty and stress relaxation complexity, and achieve the effect of low cost and accurate calculation

Active Publication Date: 2014-04-23
BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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Problems solved by technology

However, the stress relaxation of titanium alloy materials has the characteristics of time correlation, instantaneous micro-variation, and high nonlinearity, which lead to extremely complicated creep and stress relaxation.
Therefore, the study of creep relaxation becomes very difficult

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  • Method for computing stress relaxation numerical values and resilience of titanium alloy
  • Method for computing stress relaxation numerical values and resilience of titanium alloy
  • Method for computing stress relaxation numerical values and resilience of titanium alloy

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Embodiment Construction

[0023] Attached below Figure 1-10 The present invention is described in detail with specific examples.

[0024] The invention provides a method for calculating the stress relaxation value and springback of a titanium alloy, the process of which is as follows figure 1 shown. The steps of the present invention are as follows:

[0025] Step 1. Select TC4 titanium alloy material with a thickness of 1.5mm. Referring to the GB / T10120-1996 metal stress relaxation test method, the titanium alloy material is made into a round bar, plate or other shape sample. The tensile test was carried out on a material testing machine, and the tensile speed was controlled to be 5mm / min. When the pre-stretching amount is 4%, the stress relaxation test is carried out, and the test data is recorded.

[0026] Step 2, draw the stress relaxation curve of TC4 titanium alloy according to the stress relaxation test data with the aid of drawing software Origin, see figure 2 , where the abscissa repres...

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Abstract

The invention provides a method for computing stress relaxation numerical values and resilience of titanium alloy. The method includes steps of (1), performing thermal stress relaxation tests on titanium alloy materials on material testing machines; (2), drawing stress relaxation curves of the titanium alloy and analyzing features of the curves; (3), selecting proper creep constitutive functions according to a principle that stress relaxation is essentially creep, and determining material parameters of the titanium alloy by a trial and error process; (4), substituting the parameters determined in the step (3) into creep analysis modules on the basis of finite element software ABAQUS and analyzing creep relaxation of workpieces by a static implicit algorithm; (5), determining resilience unloading initial states according to creep relaxation data, analyzing resilience of the workpieces and determining the magnitude of resilience of the workpieces after the workpieces resile from creep. The method has the advantages that as shown by analysis results, the resilience of components is greatly reduced after the titanium alloy is relaxed from stress, and the forming precision can be improved; proper relaxation time is selected, so that the titanium alloy components can be precisely formed.

Description

technical field [0001] The invention relates to a titanium alloy stress relaxation value and springback calculation method, in particular to a stress relaxation test of a titanium alloy material, material constitutive modeling, engineering numerical analysis and springback calculation, and belongs to the technical field of material thermal processing. Background technique [0002] Titanium alloy materials have many advantages such as high specific strength, low density, high strength, high temperature resistance, corrosion resistance, and no galvanic corrosion with composite materials, so they are increasingly used in the aerospace industry. However, due to the close-packed hexagonal crystal structure of titanium alloy, there are few slip systems, the plastic formability at room temperature is very poor, and it is difficult to process by cold forming, which greatly limits its application in structure. In this regard, most titanium alloys are manufactured by hot forming. Tit...

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Application Information

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IPC IPC(8): G06F19/00G06F17/50
Inventor 肖军杰李东升续明进程光耀李宏峰
Owner BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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