System for testing fatigue crack propagation in corrosion environment

Abstract

A system for testing fatigue crack propagation in a corrosion environment comprises a fatigue testing machine, a medium box, a solution circulating pump, a filter, a flow control valve, a solution tank, a clamp, a crack observing system and a test sample, wherein the test sample is mounted on the clamp, the clamp is connected with the fatigue testing machine, the medium box is arranged on the test sample in a sleeving manner, so that the liquid level of the solution is higher than the to-be-observed part of the test sample, the solution circulating pump conveys an etchant solution filtered by the filter to the medium box from the solution tank, the solution in the medium flows back to the solution tank after the flow speed of the solution is controlled by the flow control valve, and the crack observing system with a microscope records the crack propagation condition through a computer. The system for testing the fatigue crack propagation in the corrosion environment is scientific in conception, simple in structure and convenient in operation and can be used to test the fatigue crack propagation property in the corrosion environment, and the test result has a great important engineering application value for assessing the damage tolerance of a material and a structure in the corrosion environment.

Description

technical field [0001] The invention relates to a fatigue crack growth test system in a corrosive environment, which belongs to the technical field of test and test. Background technique [0002] Engineering materials and structures are subjected to alternating loads during use, and fatigue damage may occur. In order to ensure their safety, it is necessary to test their fatigue performance. After years of technological development, a complete fatigue performance testing standard has been formed; engineering materials and Structures are also often used in corrosive environments. For example, aircraft and ships serving in coastal or offshore environments are corroded by seawater and salt spray for a long time. Therefore, their corrosion fatigue crack growth performance must be measured to evaluate their corrosion fatigue cracks. Extended life. At present, the test of crack growth performance at home and abroad mainly relies on manual observation and recording through magnifyi...

AI Technical Summary

Problems solved by technology

At present, the test of crack growth performance at home and abroad mainly relies on manual observation and recording through magnifying glass marking. The accuracy is low and it is difficult to test the fatigue crack growth performance in a corrosive environment. That is to say, there is still a lack of effective crack growth in a corrosive environment. Performance test test system

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