CN101221108A - A Rotary Bending Corrosion Fatigue Experimental Device - Google Patents

Abstract

The invention discloses a rotary bending fatigue test device, which comprises a rotary bending fatigue test device and a corrosive liquid supply system, wherein the rotary bending fatigue test device is used for clamping a test piece, and during the process of driving the test piece to rotate Apply a bending load to it, and realize the test of the fatigue data of the specimen; the corrosive liquid supply system includes a liquid storage tank, an infusion pump, a flow regulating valve and connecting pipes, and the corrosive liquid supply system supplies the test specimen under test in real time through its output port. Conveying corrosive liquid. On the basis of the existing rotary bending fatigue testing machine, the invention realizes the test of the medium, high cycle and super high cycle corrosion fatigue performance of materials by adding a corrosive liquid supply system. Since the design of the test device is close to the actual engineering, the measured results using this device have great reference value for engineering design. The corrosion fatigue experiment device of the present invention has simple structure and convenient operation, and can obtain standardized experiment results.

Description

A Rotary Bending Corrosion Fatigue Experimental Device

technical field

The invention relates to material fatigue test technology, in particular to a rotating bending corrosion fatigue test device.

Background technique

Corrosion fatigue of materials has always been a concern in the engineering and scientific communities. Many equipment and mechanisms in engineering are subjected to the dual effects of alternating loads and medium environments during their service period, that is, they are subject to corrosion fatigue. Therefore, how to test the corrosion fatigue performance of materials is an important issue in the research of material fatigue.

In the past, when people performed corrosion fatigue tests on materials, they usually completely immersed the material specimens in the corrosive solution, and applied pressure and tension alternately at both ends of the specimens, so as to obtain the corrosion fatigue data of the materials. Due to the different load application methods, this test method cannot truly reflect the working state of the material when it is subjected to alternating bending loads in a corrosive environment, so the obtained data cannot be used as the basis for engineering design.

Contents of the invention

For the problems existing in the prior art, the object of the present invention is to design a rotating bending corrosion fatigue experimental device capable of testing the alternating bending fatigue of materials in a corrosive environment on the basis of the existing rotating bending fatigue testing machine. The device can be used to test the fatigue performance of materials in different corrosive medium environments.

To achieve the above object, the technical solution of the present invention is:

A rotary bending fatigue test device, including a rotary bending fatigue test device and a corrosive liquid supply system, wherein the rotary bending fatigue test device is used for clamping a test piece, and applies a bending load to the test piece during the process of driving the test piece to rotate, And realize the test of the fatigue data of the specimen; the corrosive liquid supply system includes a liquid storage tank, an infusion pump, a flow regulating valve and connecting pipes, and the corrosive liquid supply system delivers the corrosive liquid to the specimen under test in real time through its output port.

Further, the liquid storage tank in the corrosive liquid supply system is arranged above the test piece mounted on the rotating bending fatigue test device, and the corrosive liquid in it is applied to the surface of the test piece by falling by its own gravity.

Further, the rotary bending fatigue test device is provided with a corrosive liquid recovery container under the clamping part of the test piece, and the container is connected to the input end of the infusion pump in the corrosive liquid supply system through a pipeline, so that The corrosive liquid supply system becomes a system capable of self-circulation.

Further, the recovery container is provided with a liquid level sensor, and the infusion pump automatically sends the corrosive liquid in the recovery container back to the liquid storage tank according to the detection signal of the liquid level sensor.

On the basis of the existing rotary bending fatigue testing machine, the invention realizes the test of the medium, high cycle and super high cycle corrosion fatigue performance of materials by adding a corrosive liquid supply system. Since the design of the test device is close to the actual engineering, the measured results using this device have great reference value for engineering design. The corrosion fatigue test device of the present invention is simple in structure, easy to operate, and can obtain standardized test results. The corrosion solution therein can also be recycled during the test process, and the flow rate of the test solution can be controlled.

Description of drawings

Fig. 1 is a structural schematic diagram of the first embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a second embodiment of the present invention;

Drawing description: 1 pipeline, 2 liquid storage tank, 3 flow regulating valve, 4 test piece, 5 infusion pump, 6 recovery tank, 7 loading weight, 8 rotating fatigue test device.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1:

The device shown in Figure 1 includes a corrosive liquid supply system composed of a liquid storage tank 2, a valve 3, an infusion pump 5, a pipeline 1, and a recovery tank 6, and a rotating fatigue test device 8, wherein the rotating fatigue test device 8 adopts an existing The experimental device that has, this experimental device is equipped with loading weight 7 by itself. The test piece 4 is mounted on the rotating fatigue test device 8, the liquid storage tank 2 and the corrosive liquid output port of the corrosive liquid supply system are set above the test piece 4, and the recovery tank 6 is set under the test piece 4.

During the experiment, the rotating fatigue test device 8 drives the test piece 4 to rotate, and uses the loading weight 7 to apply a bending load to it. At the same time, the corrosive test solution drips on the surface of the test piece 4 through the pipeline under the action of gravity, so that the test solution Continuously dripping onto the surface of the test piece 4, the surface of the test piece 4 is always covered by the corrosive liquid, thus realizing the test of the alternating bending fatigue performance of the material in a corrosive environment. During operation, the flow rate of the corrosive liquid can be adjusted through the valve 3; the frequency of the alternating bending load borne by the specimen 4 can be set by adjusting the speed of the driving motor in the experimental device. The test solution drips from the surface of the test piece 4 into the recovery tank 6. When the test solution in the recovery tank reaches a certain amount, the infusion pump 5 works to send the recovered corrosive solution back to the liquid storage tank 2 again. The experimental solution in the recovery tank 6 is transported to the liquid storage tank 2 through the infusion pump 5 through the pipeline 1, so that the recycling of the experimental solution is realized. In addition, a certain amount of experimental solution was drawn every 12 hours to detect the concentration, and the concentration of the experimental solution was adjusted to reach the set value.

The experimental device of this embodiment is suitable for testing the corrosion fatigue performance of materials in weakly volatile corrosive media.

Example 2:

FIG. 2 is a schematic diagram of the second embodiment of the present invention, and the settings of the infusion pipeline 1 and the valve 3 are the same as those in the first embodiment. However, in this embodiment, after the test solution drops into the recovery tank 5, it is not recycled and stored directly. It is suitable for testing the corrosion fatigue performance of materials in highly volatile media.

Claims (4)

1. A rotary bending fatigue test device, characterized in that it comprises a rotary bending fatigue test device and a corrosive liquid supply system, wherein the rotary bending fatigue test device is used for clamping of the test piece, and in the process of driving the test piece to rotate Apply a bending load to it, and realize the test of the fatigue data of the specimen; the corrosive liquid supply system includes a liquid storage tank, an infusion pump, a flow regulating valve and connecting pipes, and the corrosive liquid supply system supplies the test specimen under test in real time through its output port. Conveying corrosive liquid. 2. The rotary bending corrosion fatigue test device according to claim 1, wherein the liquid storage tank in the corrosive liquid supply system is arranged above the clamped test piece on the rotary bending fatigue test device , the corrosive solution in it is applied to the surface of the test piece by its own gravity. 3. The rotary bending corrosion fatigue test device as claimed in claim 2, characterized in that, on the rotary bending fatigue test device, a corrosive liquid recovery container is also provided under the clamping position of the test piece, and the container passes through the The pipeline is connected with the input end of the infusion pump in the corrosive liquid supply system, so that the corrosive liquid supply system becomes a self-circulating system. 4. The rotary bending corrosion fatigue test device according to claim 3, wherein a liquid level sensor is arranged in the recovery container, and the infusion pump automatically transfers the corrosive liquid in the recovery container to the liquid level according to the detection signal of the liquid level sensor. Return to the liquid storage tank.

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