Cyclic hydrodynamic pipeline fracture simulation experiment apparatus and cyclic hydrodynamic pipeline fracture simulation experiment method

Abstract

The invention relates to a cyclic hydrodynamic pipeline fracture simulation experiment apparatus, which comprises an experiment pipe section, a left side connecting pipe section, a rear side connecting pipe section, a right side connecting pipe section, an electric circulation pump, a pressurizing system and a DIC test system, wherein the experiment pipe section, the left side connecting pipe section, the electric circulation pump, the rear side connecting pipe section and the right side connecting pipe section are sequentially connected through flanges in a head-to-tail connection manner, thepressurizing system is arranged on the right side of the right side connecting pipe section, and the DIC test system is placed on the front side of the experiment pipe section. Compared to the apparatus in the prior art, the apparatus of the present invention has the following advantages that the expansion condition of the pipeline crack under the action of the internal fluid can be completely reproduced, the internal pressure and the crack tip state are the same as the actual working conditions, the size error is reduced, the reliability of the data is ensured, the flow rates of different fluids are changed by using the electric circulation pump in the experiment so as to achieve the research on the influence of the flow rate on the pipeline crack expansion, and the fluid pressure is changed by using the electric booster pump in the experiment so as to achieve the research on the influence of the pressure on the pipeline crack expansion.

Description

technical field [0001] The invention belongs to the field of pipeline design and manufacture, and in particular relates to a circulating hydrodynamic pipeline fracture simulation experiment device and an experiment method. Background technique [0002] Fracture toughness is a necessary material parameter to evaluate the structural integrity of pipelines, and its value is often obtained from pipeline fracture experiments. Piping fracture experiments can be divided into small laboratory experiments, large laboratory experiments and actual structural experiments. The small-scale laboratory experiments are based on standard small-scale test pieces, including: three-point bending test pieces, compact tensile test pieces, etc., but because these test pieces are different from the actual pipeline constraints, the measured results are used for pipelines. error; large-scale laboratory experiments mainly include wide-plate tests, which require extremely high loading capacity of the t...

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Problems solved by technology

The small-scale laboratory experiments are based on standard small-scale test pieces, including: three-point bending test pieces, compact tensile test pieces, etc., but because these test pieces are different from the actual pipeline constraints, the measured results are used for pipelines. error; large-scale laboratory experiments mainly include wide-plate tests, which require extremely high loading capacity of the test machine, so the cost is high; actual structural experiments such as full-scale blasting tests have high experimental accuracy, but the operation process is complicated and consumes a lot of money manpower and material resources, and the experiment process is extremely dangerous

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