One-way hydraulic expansion pipe fracture simulation experiment device and experiment method

Abstract

The invention relates to a one-way hydraulic diameter-expanding pipeline breakage simulation experiment device which comprises a pipeline supporting system, a pipeline expanding system, an oil incoming pipe and a DIC testing system. The pipeline supporting system supports two ends of an experimental pipe section, the side wall of the experimental pipe section is provided with axially-penetrating precracks which are symmetric according to an axial middle plane of the experimental pipe section, the inner end face of the pipeline expanding system is coincident with the axial middle plane of the experimental pipe section, incoming oil of the oil incoming pipe provides hydraulic power to the pipeline expanding system, and the DIC testing system observes the breakage process of the experimental pipe section in real time. A hydraulic driving device is adopted for an experiment, so that working risk is lowered, and cost is reduced; during the experiment, opening speed of a fan-shaped block and expanding speed of the cracks can be controlled by controlling moving speed of an extensible rod, so that accuracy of acquired data is ensured; the fan-shaped block is long enough and contacts with a pipe wall uniformly in the process of expanding, so that stable expanding of the cracks during the experiment is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of pipeline design and manufacture, and in particular relates to a one-way hydraulic expansion type pipeline fracture simulation experimental device and an experimental method. Background technique [0002] Pipeline fracture experiments have important applications in determining the characteristics of pipeline fractures. The current pipeline fracture experiments can be divided into small laboratory experiments, large laboratory experiments and actual structural experiments. Small laboratory experiments include: three-point bending test, compact tensile test and drop weight test, etc. Small laboratory experiments use small specimens to study fracture characteristics. There are dimensional errors and restraint errors between pipe specimens and actual pipes, which affect the Judgment and understanding of pipeline fracture characteristics; large-scale laboratory experiments such as wide-plate tests require extre...

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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