Fatigue experiment device for deepwater stand pipe

Abstract

The invention relates to a fatigue experiment device for a deepwater stand pipe, which is characterized by comprising a main cylinder barrel, an axial loading cylinder, a stand pipe test piece assembly, transverse servo loading cylinders and soil action servo loading cylinders, wherein the top of the main cylinder barrel is provided with an external pressure joint and an air vent valve; two ends of the main cylinder barrel are respectively connected with the axial loading cylinder with an axial force joint; two ends of the stand pipe test piece assembly are respectively hinged on a piston of the axial loading cylinder on the corresponding side; the stand pipe test piece assembly comprises a test piece body and a connecting rod, wherein simulated soil is arranged below the test piece body,two ends of the test piece body are respectively provided with an internal pressure joint, and the test piece body is provided with a plurality of sensors; a test lead of each sensor penetrates out of the main cylinder barrel to be connected with the test instrument; each transverse servo loading cylinder and the soil action servo loading cylinders are all arranged on the main cylinder barrel; the pistons of two transverse servo loading cylinders are supported on the top of the test piece body; the piston of the other transverse servo loading cylinder is supported on the bottom of the junction of the test piece body and the connecting rod; and the piston of each soil action servo loading cylinder is supported on the bottom of the simulated soil.

Description

technical field [0001] The invention relates to a fatigue test device, in particular to a deep water standpipe fatigue test device which can simulate the seabed contact effect. Background technique [0002] Generally, the stress of deep water risers is more complicated, such as figure 1 As shown, the force types generally include external pressure of seawater, internal pressure of fluid in the pipe, buoyancy of underwater riser, and dynamic alternating tension, compression and bending caused by factors such as waves and currents. The pipe-soil dynamic alternation. From the perspective of stress state, the deepwater riser is in a complex three-way alternating stress state, which is very prone to fatigue failure, and it is very different from fatigue failure under one-way (tension, compression, bending) stress state. [0003] As far as the current situation is concerned, there are no literatures at home and abroad on the fatigue test device and method for simulating the comp...

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Problems solved by technology

[0003] As far as the current situation is concerned, there are no literatures at home and abroad on the fatigue test device and method for simulating the complex stress state of deepwater risers under the conditions of internal and external pressure, axial force, bending moment, and joint action of pipe and soil.

In general, conventional tension-compression and bending fatigue test machines are used to carry out fatigue experimental research on the unidirectional stress state of deepwater riser materials or structures, which deviates greatly from the stress state of deepwater riser pipes

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