A Method for Determining Vibration Parameters of Fatigue Damage Repair Under Unconstrained Vibration Treatment

A vibration processing and vibration parameter technology, applied in the processing of detected response signals, instruments, measuring devices, etc., can solve problems such as casualties and economic losses, and achieve the effects of improving fatigue life, improving microstructure, and eliminating fatigue damage.

Active Publication Date: 2022-03-29
BEIJING UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] According to statistics, 80% of mechanical fracture accidents are caused by metal fatigue, often causing serious economic losses and casualties

Method used

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  • A Method for Determining Vibration Parameters of Fatigue Damage Repair Under Unconstrained Vibration Treatment
  • A Method for Determining Vibration Parameters of Fatigue Damage Repair Under Unconstrained Vibration Treatment
  • A Method for Determining Vibration Parameters of Fatigue Damage Repair Under Unconstrained Vibration Treatment

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Embodiment Construction

[0025] The specific operation process of the present invention will be further illustrated by way of examples below in conjunction with the accompanying drawings.

[0026] Step 1): Select figure 1 For the copper thin film specimen shown, an external load of 9N is applied, and a fatigue test is carried out on a micro-fatigue testing machine to obtain a damaged specimen whose damage degree is 0.5 times of the original life. According to the stress of the test piece and the material constant of copper, the number of dislocations in the internal dislocation accumulation of the material is determined. For the copper thin film specimen subjected to an external load of 9N, the number of dislocations accumulated in the grains inside the material is 37;

[0027] Step 2): When n is large enough, obtain an approximate solution x of the distance between dislocations i ,Calculated as follows;

[0028]

[0029] Step 3): According to the distance between dislocations obtained in step 2...

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Abstract

The invention discloses a method for determining vibration parameters of fatigue damage repair under unconstrained vibration treatment. The number n of dislocations in the intragranular dislocation plug product; step (2) when n is large enough, obtain the approximate solution x of the distance between each dislocation and the dislocation source i ; Step (3) calculates the back stress τ suffered by the dislocations in the plugging product according to the distance between dislocations obtained in step (2) Back and mirror stress τ Image ; Step (4) carries out modal analysis to the test piece, obtains the natural frequencies and mode shapes corresponding to different orders of the test piece, and determines the frequency range required for repair; step (5) carries out harmonic response analysis to the test piece, and obtains different Elastic force τ generated by unconstrained vibration treatment under vibration parameters E ; Step (6) when the superposition of the elastic force, the back stress and the mirror image force exceeds the Paine force τ P‑N , the dislocation starts to move, and the appropriate vibration parameters can be selected according to the elastic force obtained in step (5). This method can better select the repair parameters for unconstrained vibration treatment.

Description

technical field [0001] The invention belongs to the field of mechanical manufacturing and fatigue damage repair, and relates to a method for determining vibration parameters of fatigue damage repair under unconstrained vibration processing. Background technique [0002] According to statistics, 80% of mechanical fracture accidents are caused by metal fatigue, often causing serious economic losses and casualties. Therefore, it is of great significance to repair the fatigue damage of materials. Unconstrained vibration repair treatment is an emerging method for healing material fatigue damage. Through unconstrained vibration treatment, material fatigue damage can be repaired, the microstructure of materials can be improved, and the fatigue life can be increased. At the same time, the vibration parameters have a great influence on the repair effect, and the selection of the vibration parameters determines the quality of the repair effect, so it is particularly important to prop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04G01N29/44
CPCG01N29/04G01N29/4409G01N2291/0234G01N2291/0258
Inventor 尚德广张海萌刘小冬张宇郭一二
Owner BEIJING UNIV OF TECH
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