One-way hydraulically driven fully cracked pipeline fracture simulation experimental device and experimental method

A driving type, pipeline technology, applied in measuring devices, using stable tension/pressure test material strength, instruments, etc., can solve the problems of difficult preparation, high risk and high cost of pipeline fracture test specimens, and reduce work Risk, cost reduction, effect of reducing dimensional errors

Active Publication Date: 2019-07-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the existing technical defects, the present invention provides a device and an experimental method for directly performing a fracture simulation experiment on a pipe section. By using the device, the fracture experiment can be safely performed on the pipe section, and the crack growth can be observed in real time. To solve the problems of difficult preparation of conventional pipeline fracture test specimens, large errors, high cost, high risk, etc., and the structure is simple and easy to use

Method used

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  • One-way hydraulically driven fully cracked pipeline fracture simulation experimental device and experimental method
  • One-way hydraulically driven fully cracked pipeline fracture simulation experimental device and experimental method
  • One-way hydraulically driven fully cracked pipeline fracture simulation experimental device and experimental method

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Embodiment 1

[0021] Such as Figure 1 to Figure 6 As shown, the unidirectional hydraulically driven full-crack pipeline fracture simulation experiment device includes: pipeline support system 15, pipeline expansion system 14, pull rod 3, DIC test system 19; The crack 9 and the prefabricated crack 9 are symmetrical about the axial middle plane of the test pipe section 4; the pipe support system 15 supports both ends of the test pipe section 4; the pipe expansion system 14 is located inside the test pipe section 4; 3 traction for simulation experiments; DIC test system 19 for real-time observation of the fracture process of the experimental pipe section 4.

[0022] Pipe support system 17 includes: left upper collar 16A, left lower collar 17A, right upper collar 16B, right lower collar 17B, rubber collar 18; left upper collar 16A, left lower collar 17A are located The ring 16A is the upper left rubber ring 6A and the upper left metal ring 10A from the inside to the outside, and the lower lef...

Embodiment 2

[0033] Such as Figure 7 As shown, the difference between embodiment two and embodiment one is: eight first fan-shaped blocks 7A are combined to form a cylinder whose inner wall is a tapered through hole, and the inner end surface of the cylinder is located on the middle surface of the experimental pipe section 4; The outer wall of the tube is in close contact with the inner wall of the experimental pipe section 4; the inward end of the tapered through hole has a small diameter, and the outward end has a large diameter. The first tapered block 1A passes through the tapered through hole along the central axis, and the first tapered block The length of 1A is less than the length of the tapered through hole; the first tapered block 1A is a circular truncated, and the inner end surface is a small-diameter end; the first tapered block 1A matches the shape of the tapered through hole. Eight second fan-shaped blocks 7B are combined to form a cylinder whose inner wall is a tapered thr...

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Abstract

The invention relates to a unidirectional hydraulic drive type full crack pipeline fracture simulation experimental facility, which comprises a pipeline support system, a pipeline extension system, a pull bar, and a DIC test system. The lateral wall of an experimental pipeline section is provided with an axially penetrated prefabricated crack, which is symmetric relative to axial middle surface of the experimental pipeline section. The pipeline support system supports two ends of the experimental pipeline section. The pipeline extension system is pulled by the pull bar to carry out a simulation experiment. The DIC test system monitors the fracture process of the experimental pipeline section in real time. The adopted full size pipeline sample is directed taken from a pipeline, the error is reduced, and the data reliability is guaranteed. A hydraulic driven device is adopted, and the risk and cost are reduced. The expansion speed of a sector block is controlled by controlling the moving rate of the pull bar, at the same time, the expansion speed of the crack is controlled, and the data accuracy is ensured. The sector block has an enough length, so during the expansion process, the sector block evenly contacts with the pipeline wall, and the stable expansion of the crack during the experiment process is guaranteed.

Description

technical field [0001] The invention belongs to the field of pipeline design and manufacture, and in particular relates to a unidirectional hydraulically driven full-crack pipeline fracture simulation experiment device and an experiment method. Background technique [0002] Pipeline fracture experiments have an important application in determining the fracture characteristics of pipelines. At present, pipeline fracture experiments can be divided into small laboratory experiments, large laboratory experiments and actual structural experiments. Small-scale laboratory experiments include: three-point bending test, compact tensile test and drop weight test, etc. Small-scale laboratory experiments use small specimens to study fracture characteristics. There are dimensional errors and constraint errors between pipe specimens and actual pipes, which affect Judgment and understanding of pipeline fracture characteristics; large-scale laboratory experiments such as wide-plate tests re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/12
CPCG01N3/12G01N2203/0019G01N2203/0066
Inventor 衣海娇甄莹曹宇光孙永泰黄小光李云鹏
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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