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tc4 welded component life n f Forecasting and reliability analysis methods

A technology of welding components and analysis methods, applied in the direction of applying repetitive force/pulsation force to test the strength of materials, etc., can solve problems such as short life, reduced economic benefits, production costs and waste of use, and achieve the effect of large-scale engineering application value

Inactive Publication Date: 2016-10-26
NINGDE VOCATIONAL & TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The life predicted by the linear damage model is conservative, which will cause waste in production cost and use
For example, the life predicted by the linear damage model at 250MPa is less than 10% of the real life, which greatly reduces its economic benefits

Method used

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  • tc4 welded component life n <sub>f</sub> Forecasting and reliability analysis methods
  • tc4 welded component life n <sub>f</sub> Forecasting and reliability analysis methods
  • tc4 welded component life n <sub>f</sub> Forecasting and reliability analysis methods

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Experimental program
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Effect test

Embodiment

[0030] The present invention will be further elaborated below in conjunction with the drawings.

[0031] figure 1 It is a flow chart of predicting the service life and reliability of TC4 weldment in the present invention.

[0032] In the pretreatment stage of the weldment, the TC4 sample is first cleaned and soaked in a diluted NaOH+alcohol solution, and then the sample is soaked in HF+HNO at room temperature 3 + water solution, rinse with cold water and acetone respectively.

[0033] The argon arc welding adopts symmetrical welding, and the front and back of the high temperature zone of the weld are protected by an argon gas drag cover. The weld quality of the TC4 components after argon arc welding meets the requirements of the first-class weld quality in GJB1718A. The fatigue test of the TC4 welded specimen is carried out on the Instron-1341 testing machine, and the fatigue test is carried out in accordance with the national standard GB / T3051982 "Metal Axial Fatigue Test M...

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Abstract

The present invention relates to TC4 welded component life N f Prediction and reliability R analysis method, that is, the American brand Ti 6 Al 4 V welded component life N f Prediction and analysis of reliability R, characterized in that: wherein the lifetime N f The prediction includes the following steps: (1) Pretreatment of the TC4 sample; (2) Argon arc welding of the sample; (3) Fatigue test of the sample; (4) Determination of the initial damage Do value of the material, (5) Determination of the stress value σ of the sample 1 , σ 2 and σ 3 , the σ 1 , σ 2 and σ 3 It is to measure the normal stress on the three main planes of the same point; use a stress tester or a hardness tester to measure the stress; (6) then according to the formula Calculate the service life of the component under the set temperature T and stress σ.

Description

technical field [0001] The invention relates to a life prediction and reliability analysis method of a welded component, in particular to a TC4 alloy life prediction and reliability analysis method. technical background [0002] TC4 titanium alloy, that is, the American brand of Ti 6 Al 4 V welded components have the characteristics of low density, good toughness, high specific strength, corrosion resistance and good medium and low temperature performance. Therefore, among many titanium alloys, TC4 is the most widely used, and its consumption exceeds 50% of the total titanium alloys in the world. TC4 is an important material in aviation, aerospace, shipbuilding, military and other fields. For example, in the field of ships and ships, it can be applied to many aspects such as hull structure, propulsion system, power system, electronic information system and special equipment. [0003] With the increase in the use of TC4 titanium alloy and the increasingly complex shape of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/32
Inventor 林有智傅高升廖萍潘玉成李宗文高平生魏炜宋莉莉刘珍珠
Owner NINGDE VOCATIONAL & TECHN COLLEGE