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One-way driving semi-cracked pipeline fracture simulation experimental device and experimental method

A simulated experimental device and driving technology, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of difficult, dangerous, and large errors in the preparation of test pieces for pipeline fracture experiments, and achieve reduced work risks, convenient acquisition, and The effect of reducing size error

Active Publication Date: 2019-08-16
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 driving semi-cracked pipeline fracture simulation experimental device and experimental method
  • One-way driving semi-cracked pipeline fracture simulation experimental device and experimental method
  • One-way driving semi-cracked pipeline fracture simulation experimental device and experimental method

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Experimental program
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Effect test

Embodiment 1

[0027] Such as Figure 1 to Figure 7 As shown, the unidirectional hydraulically driven half-crack pipeline fracture simulation experimental device includes: pipeline support system 17, pipeline expansion system 16, tie rod 3, DIC test system 15; the side wall of experimental pipe section 4 is provided with axial penetration prefabricated Crack 10, pre-crack 10 is symmetric about the axial midplane of the experimental pipe section 4; the pipe support system 17 supports both ends of the experimental pipe section 4; the inner end surface of the pipe expansion system 16 coincides with the axial midplane of the experimental pipe section 4 ; The pipeline expansion system 16 is pulled by the tie rod 3 to expand the sidewall of the experimental pipe section 4, causing the experimental pipe section 4 to fracture; the DIC testing system 15 conducts real-time observation of the fracture process of the experimental pipe section 4.

[0028] Pipe support system 17, including: left upper clamp r...

Embodiment 2

[0038] Such as Figure 8 As shown, the difference between the second embodiment and the first embodiment is that the eight sector blocks 7 are combined to form a cylindrical body with a tapered through hole on the inner wall. The inward end of the tapered through hole has a smaller diameter and the outward end has a larger diameter. Conical block 1 passes through the conical through hole along the central axis, the length of the conical block 1 is less than the length of the conical through hole; the conical block 1 is a truncated cone, the inner end surface is a small diameter end; the conical block 1 and the cone The shape of the through holes are matched with each other; the tie rod 3 passes through the conical block 1 along the central axis, and the tie rod 3 is fixed on the conical block 1 through the first fixing nut 2A and the second fixing nut 2B. The outer end of the tie rod 3 is connected with the hydraulic device. The hydraulic device pulls the pipeline expansion syst...

Embodiment 3

[0041] Such as Figure 9 to Figure 12 As shown, the difference between the unidirectional motor-driven half-crack pipeline fracture simulation experimental device and the second embodiment is that the screw 23 is used instead of the tie rod 3, and the electric motor 22 is used as the power device; the screw 23 and the tapered block 1 rely on threads connection.

[0042] Experimental methods for pipe fracture simulation experiments, such as Figure 11 to Figure 12 As shown, the above-mentioned unidirectional motor-driven half-crack pipeline fracture simulation experimental device is different from the second embodiment in that: during the experiment, the motor 22 provides power to control the screw 23 to rotate around the axial direction, and then the wire The bar 23 converts the rotational movement into the axial rotation movement of the cone block 1 and the linear movement to the left along the axial direction. At the same time, the sector block 7 slowly expands radially outward...

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Abstract

The invention relates to a one-way driven semi-crack pipe fracture simulation experiment device. The device comprises a pipe support system, a pipe expansion system and a DIC test system. The pipe support system supports both ends of an experimental pipe section. The inner end face of the pipe expansion system coincides with the axial midface of the experimental pipe section. The pipe expansion system extends the experimental pipe section through pull rod or screw driving so that the experimental pipe section is broken. The DIC test system realizes real-time observation of the breaking process of the experimental pipe section. Compared with the prior art, the device utilizes a full-size pipe sample as an experimental specimen directly captured from the pipe, reduces and limits the size error, and ensures the reliability of the data. The experiment uses the hydraulic cylinder or the electric motor driving device, reduces a work risk and reduces a cost. In the experimental process, by controlling the movement speed of the pull rod and screw, a fan-shaped block expanding rate can be controlled, a crack expansion rate can be controlled and the accuracy of the data is guaranteed.

Description

Technical field [0001] The invention belongs to the field of pipeline design and manufacture, and specifically relates to a unidirectional drive type half-crack pipeline fracture simulation experiment device and an experiment method. Background technique [0002] Pipeline fracture experiments have important applications in determining the fracture characteristics of pipelines. The pipeline fracture experiments at this stage 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. Small-scale laboratory experiments use small specimens to study the fracture characteristics. There are dimensional errors and constraint errors between the pipe specimens and the actual pipes, which affect Judgment and understanding of pipeline fracture characteristics; large-scale laboratory experiments such as wide-plate tests require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0032G01N2203/0067
Inventor 甄莹衣海娇曹宇光张士华张立松聂文俊刘畅
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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