Bi-metal composite pipe bending test device

Abstract

The invention discloses a bi-metal composite pipe bending test device. The bi-metal composite pipe bending test device comprises a base, wherein two bending force loading mechanisms, two axial force loading mechanisms and a twisting force loading mechanism are installed on the base, a strain gauge is bonded to the outer wall of a to-be-tested bi-metal composite pipe, a camera is arranged in the to-be-tested bi-metal composite pipe, the to-be-test bi-metal composite pipe is arranged above the base, the twisting force loading mechanism is arranged in the middle part of the to-be-tested bi-metal composite pipe, and two axial force loading mechanisms are symmetrically arranged on two ends of the to-be-tested bi-metal composite pipe, the two bending force loading mechanisms are symmetrically arranged on the left side and the right side of the twisting force loading mechanism, and the bending force loading mechanisms are arranged between the two axial force loading mechanisms. By adopting the bi-metal composite pipe bending test device, the bending force, the axial force and the twisting force can be loaded onto the bi-metal composite pipe, the single-stress bending test can be carried out, the arbitrary combined stress bending test also can be realized, and the situation in the bi-metal composite pipe can be monitored.

Description

technical field [0001] The invention relates to a bending test device, in particular to a bimetal composite pipe bending test device. Background technique [0002] In recent years, bimetallic composite pipes have been widely used in petroleum and chemical industries due to their excellent performance such as high pressure resistance and corrosion resistance. Due to its superior cost performance, bimetallic composite pipes have been widely used in land oil and gas exploration environments, and when pipelines are laid, they are equipped with corresponding pipe fittings, and the pipes have less or no bending. Therefore, bimetallic composite pipes are used in onshore petroleum The natural gas industry has a good application effect. With the exploitation of offshore oil and gas, bimetallic composite pipes have also begun to be used in the environment of offshore oil and gas exploitation. However, bimetallic composite pipes must meet certain bending properties when they are used ...

AI Technical Summary

Problems solved by technology

The test device has the following disadvantages: (1) It can only simulate the upward bending loading of the metal composite pipe, that is, it can only simulate the bending loading of the metal composite pipe in one direction, and cannot simulate the repeated bending and cyclic loading of the metal composite pipe in the up and down direction. Therefore, the test The device cannot obtain the bending resistance of the metal composite pipe under repeated bending and cyclic loading; (2) the two ends of the metal composite pipe cannot be loaded with axial force and twisting force when bending, but in the actual working environment, the metal composite pipe Bending is often accompanied by axial force or twisting force at both ends. Therefore, the test results of this test device cannot truly reflect the bending resistance of the metal composite pipe; (3) When the test is carried out, the test device can only collect Therefore, the test device cannot detect the integrity of the corrosion-resistant alloy layer lining the metal composite pipe during bending, and cannot obtain the inner lining of the metal composite pipe. Bending resistance of corrosion-resistant alloy layer

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