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One-way driven semi-crack pipe fracture simulation experiment device and 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: 2017-07-04
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 p

Method used

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  • One-way driven semi-crack pipe fracture simulation experiment device and method
  • One-way driven semi-crack pipe fracture simulation experiment device and method
  • One-way driven semi-crack pipe fracture simulation experiment device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as Figure 1 to Figure 7 As shown, the unidirectional hydraulically driven semi-cracked pipeline fracture simulation experiment device includes: pipeline support system 17, pipeline expansion system 16, tie rod 3, DIC test system 15; The crack 10, the prefabricated crack 10 is symmetrical about the axial mid-plane 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 mid-plane of the experimental pipe section 4 The pipe expansion system 16 is pulled by the pull rod 3 to expand the side wall of the experimental pipe section 4, causing the experimental pipe section 4 to break;

[0028] Pipe support system 17, including: left upper collar 18A, left lower collar 19A, right upper collar 18B, right lower collar 19B, rubber collar 9; left upper collar 18A, left lower collar 19A are located The collar 18A includes the upper left ru...

Embodiment 2

[0038] Such as Figure 8As shown, the difference between Embodiment 2 and Embodiment 1 is that eight fan-shaped blocks 7 are combined to form a cylinder whose inner wall is a tapered through hole. ; The tapered block 1 passes through the tapered through hole along the central axis, and the length of the tapered block 1 is less than the length of the tapered through hole; the tapered block 1 is a circular platform, and the inner end surface is a small diameter end; The shapes of the through holes match each other; the pull rod 3 passes through the conical block 1 along the central axis, the pull rod 3 is fixed on the conical block 1 through the first fixing nut 2A and the second fixing nut 2B, and the outer end of the pull rod 3 is connected with the hydraulic device. The traction of the hydraulic device moves the pipeline expansion system 16; the rubber collar 9 is installed on the left end of the pipeline expansion system 16, and is fixed on the inner wall of the experimental...

Embodiment 3

[0041] Such as Figure 9 to Figure 12 As shown, the difference between the unidirectional motor-driven semi-crack pipeline fracture simulation experiment device and the second embodiment is that the lead screw 23 is used to replace the pull rod 3, and the motor 22 is used as the power device; the lead screw 23 and the tapered block 1 rely on the thread connect.

[0042] Experimental methods for pipeline fracture simulation experiments, such as Figure 11 to Figure 12 As shown, the above-mentioned unidirectional motor-driven semi-crack pipeline fracture simulation experimental device is different from Embodiment 2 in that during the experiment, the motor 22 provides power to control the screw 23 to rotate around the axial direction, and then the screw The bar 23 converts the rotary motion into the axial rotary motion of the conical block 1 and the linear motion to the left along the axial direction. At the same time, the fan-shaped block 7 expands radially outward due to the e...

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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 in particular relates to a unidirectional driving semi-cracked 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 require extre...

Claims

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Application Information

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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)