Stress corrosion test device for marine structures under alternating dry and wet conditions

Abstract

The invention relates to a stress corrosion test device for an ocean structure under alternation of wetting and drying environment, comprising a motor, a supporting system 2, a corrosion water tank 3-1 with a water inlet pipe and a water outlet pipe, a hub 4 and a transmission system 5, wherein an accelerating pulley 1-1 and a decelerating pulley 1-2 are connected with an output shaft of the motor; the supporting system comprises 2 booms erected on two sides of the corrosion water tank 3-1, a hub rotating shaft 2-2 and a transmission rotating shaft 2-3, and round slots for containing the two rotating shafts are opened respectively in the lower and upper parts of the two booms; the hub 4 comprises two discs 4-4 and 4-11 fixedly connected with the hub rotating shaft 2-2, and a sample can be fixed between the two discs or fixed on one disc; two transmission pulleys 5-1 and 5-2 with different radii are fixedly connected with the transmission rotating shaft 2-3, and two driven pulleys with different radii are fixedly connected with the hub rotating shaft 2-2.

Description

technical field [0001] The invention relates to a corrosion test device for marine structures under the conditions of dry-wet alternation and stress coupling. The device can be used to simulate the marine structures bearing tensile, compressive and bending loads in the splash zone and tidal range zone under the environment of alternating dry-wet conditions The device is suitable for laboratory simulation of small-sized samples under external loads (such as platform support pressure caused by self-weight and riser tensile stress caused by buoyancy) and seawater dry-wet alternation caused by peripheral immersion stress corrosion. Background technique [0002] Corrosion widely exists in metal materials. For steel mechanical equipment and offshore platforms exposed to corrosive environments for a long time, corrosion has undoubtedly become the most important factor for structural failure. For the offshore riser, the riser will bear tensile load in the axial direction due to the ...

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Problems solved by technology

[0004] 1. Single structure and function, lack of stress environment simulation function, complex dry and wet environment simulation mechanism, such as "a marine metal material cycle immersion stress corrosion test chamber" with application number CN201520411083.3, and application number CN201310686889.9 "Intermittent corrosion test method and equipment under constant tensile force";

[0005] 2. It can only simulate the alternation of dry and wet environments, ignoring the influence of mechanical factors, such as "an adjustable speed test device that can be used for seawater interleaving corrosion" with the application number CN200720187751.4;

[0006] 3. The equipment is huge and the loading mechanism is complex, such as the application number CN201610177838.7 "Method for simulating corrosion of weathering steel in high humidity and heat marine atmosphere"

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