A corrosion fatigue crack growth test device

Abstract

The invention relates to the field of corrosion fatigue crack measurement, in particular to a corrosion fatigue crack growth test device, which is suitable for measuring the corrosion fatigue crack growth rate and threshold value of materials by the flexibility method, and solves the problem of the fatigue test when the sample is clamped in the prior art. The loading direction of the machine has special requirements, or the parameters of the flexibility formula need to be modified during the clamping extension timing, and the solution is easy to leak. The device includes a load application system, a crack detection system and a temperature control system. The device of the present invention is easy to operate, install and use, and the conventional vertical fatigue testing machine can be used to load the CT sample in the solution, which effectively avoids the leakage of the solution, does not need to modify the flexibility formula, and is suitable for the calculation of the flexibility method at room temperature or high temperature solution Testing of corrosion fatigue crack growth rate and threshold value of materials. Its temperature control is accurate, and it can measure the corrosion fatigue crack growth rate and threshold value of materials under normal temperature solution and high temperature solution, and it is easy to observe the corrosion state of the sample in real time.

Description

technical field [0001] The invention relates to the field of corrosion fatigue crack measurement, in particular to a corrosion fatigue crack growth test device, which is suitable for measuring the corrosion fatigue crack growth rate and threshold value of materials by a flexibility method. Background technique [0002] The measurement of fatigue cracks has always been one of the concerns of fatigue fracture researchers. Usually, visual inspection, potential drop method and flexibility method are used to measure fatigue cracks. Among them, the visual method requires the test personnel to observe and record the length of the crack in real time, and the workload is relatively large. In a corrosive environment, visual observation of the crack length is prone to large errors. For fatigue tests in corrosive media, the drop-of-potential method needs to consider the insulation between the sample and the clamping system and the insulation between the wire and the sample welding point...

AI Technical Summary

Problems solved by technology

[0005] In view of the problems existing in the prior art, the main purpose of the present invention is to provide a corrosion fatigue crack growth test device, which solves the special requirements of the fatigue testing machine in the prior art, the need to modify the flexibility coefficient and the easy solution of the clamping extension timing. In case of leakage, the device can accurately measure the corrosion fatigue crack length and control the heating temperature of the solution

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