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Method for determining relationship between defects and fatigue performance based on nondestructive testing

A fatigue performance, non-destructive testing technology, applied in the direction of testing metals, measuring devices, strength characteristics, etc., to achieve the effect of improving accuracy, design avoidance, and high accuracy

Active Publication Date: 2020-02-07
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, for additive manufacturing parts, at present, only the non-destructive testing acceptance criteria of traditional forgings or castings can be copied

Method used

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  • Method for determining relationship between defects and fatigue performance based on nondestructive testing
  • Method for determining relationship between defects and fatigue performance based on nondestructive testing
  • Method for determining relationship between defects and fatigue performance based on nondestructive testing

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The titanium alloy laser additive manufacturing material with the brand name TC11 is formed by direct deposition process, and the determination method of the relationship between defects along the fusion deposition direction and fatigue performance is as follows:

[0040] Step 1. Collection of typical defect samples

[0041] For 3 pieces of laser additive manufacturing TC11 materials with a size of 200mm×150mm×180mm, a 10MHz water immersion focusing probe is used, and under the detection sensitivity of Φ0.4mm, the sound beams are vertically incident from 6 surfaces respectively, and the internal defects of the materials are detected. Detection, to obtain C-scan images in different detection directions, and mark the corresponding parts of the defect signal on the material at the same time;

[0042] According to the C-scan image obtained by scanning and combined with the defect equivalent and buried depth information, select defects of different sizes and positions and pr...

Embodiment 2

[0068] For a SiC particle-reinforced aluminum matrix (SiCp / Al) composite material with a SiC volume fraction of 15%, the method for determining the relationship between defects and fatigue properties is as follows:

[0069] Step 1. Collection of typical defect samples

[0070] For two pieces of SiCp / Al composite materials with a size of 800mm×300mm×80mm, a 10MHz water immersion focusing probe is used to detect the internal defects of the material by making the sound beam vertically incident from the upper and lower surfaces under the detection sensitivity of Φ0.4mm , get the C-scan image, and mark the part corresponding to the defect signal on the material at the same time;

[0071] According to the C-scan image obtained by scanning and combined with the defect equivalent and buried depth information, select defects of different sizes and positions and process a cuboid sample with a size of 25mm×25mm×100mm centered on the defect;

[0072] Using the longitudinal wave direct in...

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Abstract

The invention relates to a method for determining a relationship between defects and fatigue performance based on nondestructive testing. According to the method, through the steps of nondestructive testing accurate positioning, high-cycle fatigue performance testing, fracture analysis, defect characteristic statistics and the like of defects in the material, the relationship between the characteristics such as the types, sizes, positions and distribution of the defects and the fatigue performance is determined, and the direct data support is provided for the acceptance standard of nondestructive testing of existing materials and new material products. According to the method, the defects are accurately positioned by adopting various nondestructive testing methods, and then subsequent fatigue performance testing and analysis are carried out, so the designability of defect characteristics is realized, the randomness of results is avoided, the number of fatigue performance tests is reduced, and the time and economic costs are reduced. According to the method provided by the invention, comprehensive quantitative analysis can be carried out on multiple parameters such as defect sizes,positions, types and distribution, and compared with a traditional method which can only carry out qualitative analysis on a single parameter, the obtained information is richer and more comprehensive, and the practicability is higher.

Description

technical field [0001] The invention relates to a method for determining the relationship between defects and fatigue performance based on non-destructive testing, and belongs to the technical field of non-destructive testing. Background technique [0002] With the widespread use of a large number of high-performance metal parts in key fields such as aerospace, weapons, electronics, and automobiles, it is imperative to conduct safe and reliable quality evaluation on them. Non-destructive testing technology can evaluate the quality of the inspected part and make a judgment of whether it is qualified or not according to the acceptance criteria without damaging the inspected object. However, due to the lack of basic data on the impact of defects on material properties, the acceptance criteria for nondestructive testing of existing materials often refer to or directly copy foreign acceptance criteria. A large number of studies have shown that there are certain differences betwe...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01N29/06G01N23/2251G01N23/046G01N33/204G01N33/2045
CPCG01N29/048G01N29/0645G01N29/0654G01N23/2251G01N23/046G01N33/2045G01N33/204G01N2291/0234G01N2291/0289G01N3/00G01N2203/0073G01N2223/09G01N2223/102G01N2223/6462
Inventor 杨平华梁菁史亦韦王铮沙正骁
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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