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A Judgment Method for Load Fatigue Failure of Titanium Alloy Based on Fatigue Fracture Analysis

A technology of load-holding fatigue and fatigue fracture, which is applied to the analysis of materials, material analysis through optical means, and material analysis using wave/particle radiation. It can solve problems such as failure process and complex form, and achieve accurate and reliable judgment results. The effect of strong operability and clear process

Active Publication Date: 2022-05-17
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

However, since titanium alloy parts usually undergo a relatively complicated service process during their service, their final failure process and form are also relatively complicated. How to accurately judge the load fatigue failure behavior of titanium alloy parts has an Analysis and traceability are of great value

Method used

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  • A Judgment Method for Load Fatigue Failure of Titanium Alloy Based on Fatigue Fracture Analysis
  • A Judgment Method for Load Fatigue Failure of Titanium Alloy Based on Fatigue Fracture Analysis
  • A Judgment Method for Load Fatigue Failure of Titanium Alloy Based on Fatigue Fracture Analysis

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preparation example Construction

[0031] (1) Preparation and cleaning treatment of fatigue failure fracture specimens;

[0032] The fatigue failure fracture specimen is cut to ensure that the intercepted specimen meets the size requirements of the stereo microscope and scanning electron microscope, and at the same time, it is required to retain all potential crack initiation and extension areas and some transient areas. Use acetone or alcohol to ultrasonically clean the cut fracture sample for 2 to 5 minutes to ensure that the fracture surface is clean and free from oil, impurities and foreign substances.

[0033] (2) Preliminarily judge the fatigue crack initiation position on the fracture sample, observe the fracture morphology under a macroscopic and stereoscopic microscope, and judge whether the fatigue crack initiation position on the fracture is the surface, when the fan-shaped fatigue bands near the fracture converge In terms of shape, the fatigue crack initiation position on the fracture surface is pre...

Embodiment 1

[0038] Taking the fatigue failure fracture evaluation of Ti6242 titanium alloy as an example, there are 4 fatigue failure fracture samples, such as Figure 1 to Figure 4 As shown, the load fatigue failure judging method designed by the present invention is as follows:

[0039] (1) Cut 4 fatigue fracture samples so that the height of the sample is about 20-40mm, and the length and width directions are Ф10mm to meet the shape requirements of the stereoscopic microscope and scanning electron microscope for the observation sample, and all the cut samples are kept Potential crack initiation and propagation area and partial transient area. Use acetone to ultrasonically clean the cut sample for 2 to 5 minutes to ensure that the fracture surface is clean and free from oil stains, impurities and foreign substances.

[0040] (2) Use a stereo microscope to preliminarily observe the fracture morphology of the four fatigue samples, and judge whether the fatigue crack initiation position o...

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Abstract

The invention discloses a titanium alloy load-holding fatigue failure judgment method based on fatigue fracture analysis, which belongs to the technical field of metal material failure analysis. The present invention judges whether the failure of the titanium alloy is caused by the load fatigue effect through the macro judgment and micro analysis of the fatigue failure fracture, combined with the evaluation of the failure fracture characteristics of the titanium alloy under the load load, and evaluates the load fatigue by quantifying the fracture characteristic area The strength of the effect. The invention can judge whether it is the load-holding fatigue failure of the titanium alloy material and parts through the analysis of the fatigue failure fracture under the condition of unknown fatigue load history, and has the advantages of simple method and strong implementability.

Description

technical field [0001] The invention discloses a titanium alloy load-holding fatigue failure judgment method based on fatigue fracture analysis, relates to a titanium alloy load-holding fatigue failure judgment method, and belongs to the technical field of metal material failure analysis. Background technique [0002] Titanium alloy materials generally have the characteristics of high strength, low density, excellent corrosion resistance and good fatigue resistance. As a lightweight metal structural material with excellent comprehensive mechanical properties, titanium alloys are widely used in aerospace and automobile manufacturing. Titanium alloys have been widely used in fields such as marine and marine vessels, especially in the field of aero-engines. The high comprehensive mechanical properties and low alloy density of titanium alloys make them have obvious advantages in the competition with other metal structural materials. During the development and application of tita...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/84G01N23/2251
CPCG01N21/84G01N23/2251
Inventor 张明达曹京霞黄旭
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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