Metal pipe fracture toughness detection method and system

A fracture toughness, metal pipe technology, applied in the direction of using a single impact force to test the strength of materials, measuring devices, analyzing materials, etc., can solve the problems of large errors and long detection periods, and achieve small measurement errors, few parameters, and calculation process. simple effect

Inactive Publication Date: 2019-01-15
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for detecting the fracture toughness of metal pipes, so as to solve the problems of long detection period and lar...

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  • Metal pipe fracture toughness detection method and system
  • Metal pipe fracture toughness detection method and system
  • Metal pipe fracture toughness detection method and system

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experiment example

[0082] Double cantilever beam sample DCB is currently recognized as the most accurate fracture toughness test sample for metal pipes. Therefore, this experimental example adopts double cantilever beam sample DCB to test the fracture toughness to verify the data of the present invention, specifically including the following steps:

[0083] 1. Select the same section of metal pipe in the embodiment, and make a double cantilever beam sample DCB for testing the fracture toughness according to the standard NACE 0177-2005.

[0084] 2. Use the MTS810 material testing machine to automatically record the load F and the displacement q of the force application point under tensile loading, referring to the provisions in the standard GB / T 4161-2007, for the F-q curve of the double cantilever beam sample DCB, take FQ=F5( The slope of the linear segment decreases by 5% and the intersection point of the F-q curve).

[0085] Double cantilever beam specimen DCB fracture toughness K IC The calc...

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Abstract

The present invention relates to a metal pipe fracture toughness detection method and system, and relates to the technical field of fracture toughness testing. The method has following steps: according to crack propagation characteristics of the Charpy V-type sample in the dynamic impact test, making a metal pipe to be tested into a Charpy V-shaped sample, establishing a corresponding relationshipbetween load of force point and displacement of force point during the crack propagation process of the Charpy V-shaped sample, combined with the crack propagation characteristics of three-point bending standard sample SEB in the static impact test, establishing corresponding relationship between load of force point and actual crack length during the crack propagation process of the Charpy V-shaped sample, and then determining corresponding relationship between stress intensity factor and the actual crack length during the crack propagation process, and finally determining fracture toughnessvalue of the metal pipe. The method can obtain detection results consistent with results of a DCB test with double cantilever beam sample, and adopts mathematical model processing method of loop iteration for the whole detection process, requires less parameters, and has simple calculation process and small measurement deviation.

Description

technical field [0001] The invention relates to a method and system for detecting fracture toughness of metal pipes, belonging to the technical field of fracture toughness testing. Background technique [0002] In industrial production, a large number of metal pipes are used as the transmission channel of the flowing medium. With the increase of service time, the safety risks faced by metal pipes gradually increase. Among them, the safety hazards caused by the cracking of metal pipes gradually appear, especially involving high-sulfur natural gas, etc. Once the metal pipe for hazardous medium transmission cracks, it may cause serious safety accidents. Therefore, it is necessary to study the crack resistance of metal pipes, which will help to clarify the operating status of metal pipes and lay a solid foundation for subsequent risk analysis and research. [0003] One defect in engineering structures is the crack, which is a crack of a certain length and its endpoint is extreme...

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Application Information

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IPC IPC(8): G01N3/30
CPCG01N3/30G01N2203/0067
Inventor 郭西水商剑锋黄雪松刘晓敏李楹王振华赵国瑜伍丹丹
Owner CHINA PETROLEUM & CHEM CORP
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