Two-way hydraulic expansion pipe fracture simulation experimental device and experimental method

Abstract

The invention relates to a bidirectional hydraulic hole-expanding type pipeline break simulation experiment device. The experiment device comprises a pipeline support system, a pipeline expanding and supporting system, an oil inlet pipe and a DIC (density indicating controller) testing system, wherein an axial penetrating precrack is formed in the side wall of an experiment pipe section, and is symmetric to the axial center surface of the experiment pipeline section; the pipeline support system is used for supporting both ends of the experiment pipeline section; the pipeline expanding and supporting system is positioned in the experiment pipeline section, and the oil from the oil inlet pipe is used for providing hydraulic power for the pipeline expanding and supporting system; the pipeline expanding and supporting system is used for expanding and supporting the experiment pipeline section, and the precrack is expanded in two directions; the DIC testing system is used for observing the breaking process of the experiment pipeline section in real time. The experiment device has the advantages that the experiment sampling adopts the full-size pipeline sampling, a sample is directly cut from a pipeline, the size error, constraint error and the like are reduced, and the data reliability is guaranteed; by adopting a hydraulic driving device in an experiment, the working risk is decreased, and the cost is reduced; the DIC testing device is used for observing the expanding condition of the crack in real time, and the required data is conveniently obtained.

Description

technical field [0001] The invention belongs to the technical field of pipeline design and manufacture, and in particular relates to a bidirectional hydraulic expansion diameter 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 te...

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

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