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Material initial damage evaluating method based on fracture quantitative retroestimation and data analysis

A technology of initial damage and quantitative analysis, applied in the direction of analyzing materials, testing the ductility of materials, measuring devices, etc., can solve problems such as unsatisfactory needs and large errors

Active Publication Date: 2014-03-26
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using smooth samples to carry out fatigue tests and evaluate their initial damage, directly using the traditional original fatigue quality evaluation method for structural details will produce large errors and cannot meet the needs

Method used

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  • Material initial damage evaluating method based on fracture quantitative retroestimation and data analysis
  • Material initial damage evaluating method based on fracture quantitative retroestimation and data analysis
  • Material initial damage evaluating method based on fracture quantitative retroestimation and data analysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0108] Taking the TA15 titanium alloy electron beam welding sample as an example, the evaluation process of the initial damage is given:

[0109] (1) Using a smooth fatigue sample, carry out a fatigue test under constant amplitude spectrum

[0110] Smooth bar-shaped sample, the middle section of the sample is electron beam welded. Test conditions: Stress ratio R=-1, the maximum stress is 500MPa, the fatigue test is carried out under the constant amplitude spectrum until the sample breaks, and the fatigue test fracture is obtained. The total life of the test is 114500 cycles.

[0111] (2) Using the fracture quantitative analysis method, the expression of the crack growth rate curve is obtained

[0112] The macroscopic morphology of the obtained fatigue fracture is shown in Figure 8 , the fatigue strips in the fatigue extension zone on the fracture see Figure 9 , on the fracture surface of the fatigue specimen, starting from the crack source area, along the main crack propa...

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PUM

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Abstract

The invention belongs to the technical field of material initial damage evaluating, and relates to an evaluating method for material initial damage, and specifically relates to a method for evaluating and characterizing material texture and initial damage of processing technology by utilizing a smooth sample for developing fatigue tests and utilizing fracture quantitative retroestimation and data analysis. According to the method, by utilizing the smooth sample, the influence of structural details is eliminated, so that the sample is easy to process, and the defects of a material or the processing technology effect can be directly evaluated; and additionally, by utilizing the fracture quantitative retroestimation method to obtain data for evaluating material initial damage, a monitoring process of crack expansion is not needed, so that the test process is convenient and practicable, and the test period and cost can be obviously saved. The problems are solved that a conventional structural detail initial fatigue quality evaluating method which is directly utilized for evaluating material initial damage is large in error or even infeasible, and the estimation precision on the material initial damage is improved.

Description

technical field [0001] The invention belongs to the technical field of initial damage evaluation of materials, and relates to an evaluation method for initial damage of materials, in particular to a method for evaluating and characterizing the material and properties of materials by using a smooth sample to conduct a fatigue test, and using fracture quantitative inversion and numerical analysis. Initial damage to the machining process. Background technique [0002] The initial damage of materials is similar to the original fatigue quality in damage tolerance design, but their connotations are different. [0003] There must be some microscopic defects (such as inclusions, pores, dislocations, etc.) and even macroscopic defects in the material; various surface or internal processing defects (such as scratches, knife marks, burns, etc.) will inevitably occur when the material is processed into components or samples. , welding defects, etc.). Material, process-related damage, ...

Claims

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Application Information

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IPC IPC(8): G01N3/00G01N3/28
Inventor 刘新灵刘春江赵凯陈星陶春虎
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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