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The method of judging the plastic index of materials in rapid deformation by using dwtt test

A plastic index, fast technology, applied in the field of machining, to achieve the effect of convenient use and low implementation cost

Inactive Publication Date: 2018-03-09
BEIJING LONGSHINE OIL TUBULAR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of method that adopts DWTT test to judge the plasticity index when material obtains rapid deformation, thus solves the aforementioned problems existing in the prior art

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  • The method of judging the plastic index of materials in rapid deformation by using dwtt test

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Embodiment

[0029] The method described in this embodiment adopts the DWTT test to evaluate the material to obtain the method of plastic index when rapidly deforming, and the method is realized according to the following steps:

[0030] S1, first obtain the original thickness t of the sample to be subjected to the DWTT test 0 , according to the formula (1) to calculate from the notch root of the sample to the hammering edge minus a sample wall thickness t 0 The original area S of the assessment area 0 ;

[0031] S 0 = t 0 ×(71-t 0 ) (1);

[0032] S2, conduct the DWTT test, measure and record the minimum thickness t of the specimen fracture min and the maximum fracture thickness t max , and the envelope area S of the fracture contour in the assessment area;

[0033] S3, calculating the plasticity index of the sample during rapid deformation; the plasticity index includes: narrowing rate τ, widening rate β, deformation rate λ and area reduction rate δ.

[0034] Calculate the narrow...

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Abstract

The invention discloses a method for obtaining the plasticity index during rapid deformation by using the DWTT test to judge the material. The method is realized according to the following steps: S1, first obtain the original thickness t0 of the sample to be subjected to the DWTT test, and calculate from the root of the notch of the sample to the Subtract the original area S0 of the evaluation area of ​​a sample wall thickness t0 from the hammering side; S2, carry out the DWTT test, measure and record the minimum thickness tmin and maximum thickness tmax of the specimen fracture, and the envelope area of ​​the fracture contour line in the evaluation area S; S3, calculate the plasticity index of the sample during rapid deformation. The invention solves the problem of how to judge the plasticity index when the material breaks under high-speed loading, and provides a basis for the crack arrest research of oil and gas pipelines. The invention adopts the DWTT test method to obtain the plasticity index of the material during rapid deformation by judging the fracture of the test sample. The method is convenient to use and low in implementation cost.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a method for evaluating the plasticity index of a material during rapid deformation by using a DWTT experiment. Background technique [0002] In the process of natural gas pipeline transportation, due to the compressibility of gas, once the natural gas pipeline cracks, the pressure in the pipeline cannot be completely released instantly, and there is a problem of whether the crack can be stopped after the crack is opened. For traditional lower steel grades (up to X70 in API SPEC5L), the Charpy impact energy value determined by Battele hyperbolic prediction is more accurate. However, when using higher steel grades (such as X80 or higher in API SPEC 5L) to use the Battele hyperbola to predict the Charpy impact energy value of crack arrest, its accuracy decreases. The reason for this problem can be considered to be that when the steel grade is low, because the low ste...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/303
Inventor 李记科杨红兵何小东王高峰聂向晖李富强马飞
Owner BEIJING LONGSHINE OIL TUBULAR TECH
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