Cyclic loading fatigue experiment device for bending moment of pipeline

Abstract

The embodiment of the invention discloses a cyclic loading fatigue experiment device for the bending moment of a pipeline. The cyclic loading fatigue experiment device comprises a pipeline end fixing structure, a bending moment loading structure and a water pressure loading structure; the pipeline end fixing structure comprises a transfer cavity, a universal ball and a connecting structure, and the transfer cavity, the universal ball and the connecting structure are matched to form a through liquid channel; the water pressure loading structure comprises a high-pressure water supply mechanism and a high-pressure water pipe; and the bending moment loading structure comprises a counter-force frame, a rotating ball and a driving part, the side, facing the pipeline end fixing structure, of the rotating ball is connected with a connecting rod assembly, and an included angle is formed between the axis of the connecting rod assembly and the connecting line between the universal ball and the connecting point on the rotating ball. One end is rotatably fixed through the pipeline end fixing structure, and the bending moment loading structure is arranged at the other end, so that high-frequency and pure bending moment cyclic loading is realized, meanwhile, integral bending moment recording can be realized, and the defects of a conventional four-point bending loading device are avoided.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of pipeline bending moment loading devices, in particular to a cyclic loading fatigue experiment device for pipeline bending moments. Background technique [0002] With the development of marine resources, not only traditional industries such as deep-sea aquaculture have received greater attention, deep-sea mining and deep-sea oil fields have also been studied by countries all over the world. As a reliable and cheap transportation method, marine risers are widely used in marine engineering. The riser is usually connected to the offshore drilling platform and the submarine pipeline. The offshore drilling platform is affected by the ocean environment such as waves, wind loads, and internal waves, and will reciprocate on the sea surface. The pulling force of the tube is usually within a safe range. However, as time goes by, under the long-term cyclic load of the pipeline, the internal sm...

AI Technical Summary

Problems solved by technology

Most of the existing bending moment fatigue devices are four-point bending loading devices, the stress concentration at the bending position is relatively large, and the main influencing factors cannot be effectively judged

At the same time, most of the existing loading devices use hydraulic cylinders for loading, and the bending moment loading stroke is limited, and due to the overheating of the cylinders, the frequency cannot be increased, and the test time is long

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