Deep sea pipeline stress corrosion complex loading test device

Abstract

The invention relates to a complicated loading test apparatus for stress corrosion of a deep-sea pipeline. The complicated loading test apparatus for the stress corrosion of the deep-sea pipeline comprises a fixed framework 1 with a cross member in the middle, a corrosion water tank 2, a constant displacement tension and compression loading module, a constant torsion-load loading module and a constant-load tension and compression load loading module, wherein a test pipe fitting 9 penetrates through a hole to be connected with the corrosion water tank 2 in a sealing manner; an axial constant displacement tension and compression loading mechanism comprises a displacement loading crossbeam 6 capable of sliding along the fixed framework 1, a tension and compression loading bolt 24, a first jack 5, a second jack 7, a first nut 25 and a second nut 26; an axial constant-load loading mechanism comprises a tension and compression loading disc 9, a grooved supporting seat 10 for supporting the tension and compression loading disc 9, a fixed supporting seat 3, a weight 18, a first pulley 16, a first suspension rope 12, a pressurizing support column 11 and a compression load transition disc 14; and a constant-load torsion loading mechanism comprises a second pulley 23, a second suspension rope 22, a pulley fixing support 20 and a third pulley 8 for transferring a torque.

Description

technical field [0001] The invention relates to a stress corrosion test device under complex loads of a laboratory submarine pipeline. The device can be used to simulate the tension-torsion coupling and compression-torsion coupling stress conditions of the submarine pipeline, wherein the tension and compression loads can realize constant load loading and constant load respectively. Displacement loading to meet different test requirements. For deep-sea pipelines, due to the huge external pressure, the pipe fittings mainly bear compressive loads, so the compressive stress loading function of this device is the core of deep-sea pipeline stress corrosion research. Background technique [0002] Corrosion exists widely in metal materials. For steel machinery equipment and oil and gas pipelines exposed to corrosive environments for a long time, corrosion has undoubtedly become the most important factor for structural failure. Onshore oil and gas pipelines are mainly subjected to i...

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Problems solved by technology

[0003] 1. The structure and function are single and not targeted. For example, most of them can only apply tensile stress, such as the test devices with application numbers CN201610030544.1 and CN201510296350.1. .2 test device, there are fewer devices that can realize combined loading, and currently only see the application number CN201510874287.5 that can realize combined loading

[0004] 2. The loading mechanism is complex, involving more electronic numerical control equipment, and the equipment is expensive

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