Three-point bending test apparatus for simulated deep sea high-pressure corrosion fatigue

Abstract

A three-point bending test apparatus for simulated deep sea high-pressure corrosion fatigue belongs to the field of metal material corrosion technology studying. The apparatus is composed of a water circulating system, a sample fixing device, a pressure head executing mechanism, a fixing rack, a temperature control box and a control main engine; and the circulating device is characterized in thatseawater in a water storage box is connected with the inlet of a booster pump through a water conveying pipeline, the outlet of the booster pump is connected with the water inlet of the kettle body through a water conveying pipeline, and a water outlet at the bottom of the kettle body of the high pressure kettle is connected with the water storage box through a water conveying pipeline. The apparatus can perform three-point bending corrosion fatigue test on a material in the simulated deep sea high-hydrostatic pressure environment, and can perform fatigue loading on a sample by adopting various waveforms (sine wave, square wave and triangular wave) through regulating the motion speed and the motion mode of a pressure head by the control main engine. The apparatus adopts a partial pressureplate to reduce the load of a bearing shaft, and the partial pressure and the high pressure kettle body are fixed to improve the reliability of the test apparatus. The apparatus has the advantages oflow cost and convenience in operation.

Description

technical field [0001] The invention belongs to the technical research field of metal material corrosion, and relates to a three-point bending test device for simulating deep-sea environment corrosion fatigue. Background technique [0002] Many marine engineering structures and equipment, such as offshore drilling platforms, submarine pipelines, ships, deep submersibles, and underwater robots, are mostly made of metal materials. In the marine environment, due to the mechanical load caused by ocean current movement, deep sea pressure and equipment operation, metal structural parts are also affected by alternating stress while being eroded by seawater. Under the synergy of corrosive media and alternating loads, corrosion fatigue is the main failure mode of marine metal structural parts. If it is not controlled, it will easily lead to major accidents and cause huge economic losses to the country and society. At present, most of the domestic and foreign researches on the three-...

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Problems solved by technology

Under the synergy of corrosive media and alternating loads, corrosion fatigue is the main failure mode of marine metal structural parts. If it is not controlled, it will easily lead to major accidents and cause huge economic losses to the country and society.

At present, most of the domestic and foreign researches on the three-point bending corrosion fatigue of metal materials in the marine environment are concentrated in the normal pressure environment. They can only study the influence of shallow sea environmental factors on the corrosion fatigue behavior of metals, and cannot comprehensively consider the impact of deep sea pressure and temperature on metal corrosion fatigue. The role of corrosion fatigue

The prediction of the corrosion fatigue strength of metal structural parts may lead to premature damage of deep-sea equipment, resulting in economic waste, and even casualties in severe cases

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