A Seawater Circulation System for Corrosion Fatigue Tests on Metal Materials

Abstract

A seawater circulation system for performing corrosion fatigue tests on metal materials consists of a seawater container 1, a micro-pump 2, a rubber conduit 3, a water flow control valve 4, a double-layer anti-leakage corrosion device 5, a sample fixing end 6, and a sample surface crack end 7. Low cycle fatigue test sample end 8, sample loading end 9, conduit 10, and filter box 11. The seawater container is inserted into the micro-pump, and the rubber conduit connects the micro-pump and the water flow control valve and communicates with the double-layer anti-leakage corrosion device. The fixed end of the sample, the crack end of the sample surface, and the low-cycle fatigue test can be fixed on the double-layer anti-leakage corrosion device. The sample end, the sample loading end, and the other end of the double-layer anti-leakage corrosion device communicate with the filter box through a conduit, and return to the seawater container after filtration. The low-cycle corrosion fatigue test under the cantilever bending loading mode can be carried out, which changes the previous status of using air fatigue performance data instead of seawater fatigue performance data for metal verification, and increases the safety, reliability and service life of the ship.

Description

technical field [0001] The invention belongs to the technical field of material testing, and more precisely relates to a seawater circulation system for carrying out corrosion fatigue tests on metal materials. Background technique [0002] When the fatigue crack growth rate test of metal materials is carried out in corrosive media, GB / T6398-2000 "Metallic Materials Fatigue Crack Growth Rate Test Method" recommends the use of standard M(T) specimens and standard C(T) specimens. Schematic diagram of the design of the corrosion solution circulation system during the test. For the standard M(T) sample, only a simple schematic diagram is given in the standard, and the figure does not further explain how to prevent the leakage of corrosive liquid. From the schematic diagram, with the periodic reciprocating movement of the sample, the corrosion solution will inevitably leak into the testing machine (the testing machines used by many domestic units are expensive imported equipment)...

AI Technical Summary

Problems solved by technology

[0003] Some literatures have mentioned the materials and production ideas used in the design of the solution circulation system, but they are basically aimed at axial loading (this loading mode is relatively easy to design and manufacture) standard specimens, and few literatures mention it. Design and fabrication methods of circulation systems under non-axial loading modes such as rotational bending loading and cantilever bending loading

Moreover, there is little mention of how to ensure that the corrosive liquid does not leak into the testing machine, that is, there are few detailed written instructions on the sealing methods of each link of the circulation system

[0004] In conclusion, no successful design examples of seawater circulation systems for low cycle corrosion fatigue testing in cantilever bending loading mode have been reported

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