CN203908892U - Mechanical stress-corrosion coupling fatigue test device - Google Patents

Abstract

The utility model discloses a mechanical stress-corrosion coupling fatigue test device, which comprises a base, a bracket, a motor, a reducer, a connecting rod, a pressure head, a test piece and a closed corrosion medium box, the base is provided with a bracket, and the center of the top of the bracket is A motor is provided, and the motor is connected to the connecting rod through a reducer. An indenter is arranged at the end of the connecting rod, and the indenter is in contact with the test piece. on the base; the pressure head is a pressure head with a pressure sensor; the liquid corrosion medium or gas corrosion medium is inside the sealed corrosion medium box. The utility model has the following beneficial effects: 1. The types of corrosive media in the test are expanded, and the test environment of various media can be simulated; 2. The equipment has a temperature control function, and can perform tests in the temperature range of 0-80°C ± 2°C; 3. .The thermal insulation system of the box makes the test temperature fluctuation small and the precision high.

Description

A Mechanical Stress-Corrosion Coupling Fatigue Test Device

technical field

The utility model relates to a fatigue test device, in particular to a mechanical stress-corrosion coupling fatigue test device.

Background technique

Reinforced concrete structures are usually mainly subjected to static loads, but in actual engineering, there are many structures such as bridges, crane beams, etc., in addition to bearing static loads, fatigue damage occurs due to repeated cyclic loads. The fatigue characteristics of structures are very complex. It is of great significance to the overall safety of structures to accurately identify whether structures or components are damaged, determine the location and degree of damage, and predict their fatigue life. So far, the research on multiaxial fatigue of concrete is not extensive and in-depth. There are only cyclic compression fatigue on one side and the other side, biaxial compression fatigue, triaxial fatigue of cylinder under confining pressure and axial compression, and cylinder fatigue. Compression-shear fatigue, and several other situations, and basically constant-amplitude fatigue, there are few studies on variable-amplitude fatigue, and there is no research on biaxial and triaxial tensile fatigue. Dalian University of Technology is conducting experimental research on the fatigue performance of concrete in multiaxial wave tension and wave tension compression. The main reason for less research on concrete multiaxial fatigue tests is that concrete multiaxial fatigue tests are relatively difficult. On the one hand, the development of multiaxial fatigue test systems is difficult and expensive. On the other hand, there are several key points in the test technical problem.

There are still some problems in the mechanical stress-corrosion coupling fatigue test device currently on the market: the test environment is relatively single, and cannot adapt to the test environment of various media, and its temperature environment is also difficult to control, the test temperature fluctuates greatly, and the accuracy is low.

Utility model content

Aiming at the deficiencies in the prior art, the purpose of this utility model is to provide a mechanical stress-corrosion coupling fatigue test device, which has a simple structure and a wide range of test environments, and can be applied to test environments of various media. The equipment has temperature control Function, and the box insulation system makes the test temperature fluctuation small, greatly improving the accuracy of the test results.

In order to achieve the above object, the utility model is realized through the following technical scheme: a mechanical stress-corrosion coupling fatigue test device, including a base, a bracket, a motor, a reducer, a connecting rod, a pressure head, a test piece and a sealed corrosion The medium box is equipped with a bracket on the base, and a motor is installed in the center of the top of the bracket. The motor is connected to the connecting rod through a reducer. In the closed corrosion medium box, the closed corrosion medium box is arranged on the base; the pressure head is a pressure head with a pressure sensor; the liquid corrosion medium or gas corrosion medium is in the closed corrosion medium box.

Preferably, the airtight corrosive medium box is connected with a heating fan, and the fan has a temperature control function (0-80°C ± 2°C). The fan is connected with external air or gas cylinders (nitrogen, carbon dioxide, etc.).

Preferably, the outer wall of the corrosive medium box is covered with an insulation layer and a heating belt, and the heating belt is arranged between the corrosive medium box and the insulation layer to ensure a constant temperature of the box.

The utility model has the following beneficial effects: 1. The types of corrosive media in the test are expanded, and the test environment of various media can be simulated;

2. The equipment has a temperature control function and can conduct tests in the temperature range of 0-80°C ± 2°C;

3. The thermal insulation system of the box makes the test temperature fluctuation small and the accuracy high.

Description of drawings

The utility model is described in detail below in conjunction with accompanying drawing and specific embodiment;

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a structural schematic diagram of the sealed corrosive medium box of the present invention.

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the utility model easy to understand, the utility model will be further elaborated below in conjunction with specific embodiments.

Referring to Fig. 1-2, this specific embodiment adopts the following technical solutions: a mechanical stress-corrosion coupling fatigue test device, including a base 1, a bracket 2, a motor 3, a reducer 4, a connecting rod 5, an indenter 6, a test part 7 and a closed corrosion medium box 8, the base 1 is provided with a support 2, the center of the top of the support 2 is provided with a motor 3, the motor 3 is connected with the connecting rod 5 through the reducer 4, and the end of the connecting rod 5 is provided with a pressure head 6, The head 6 is in contact with the test piece 7, and both the indenter 6 and the test piece 7 are set in a closed corrosion medium box 8, and the closed corrosive medium box 8 is set on the base 1; the indenter 6 is a pressure sensor with a pressure sensor. head; the sealed corrosion medium box 8 is a liquid corrosion medium or a gas corrosion medium.

It is worth noting that the airtight corrosive medium box 8 is connected to the heating fan 9, and the fan has a temperature control function (0-80°C ± 2°C). The fan is connected to external air or gas cylinders (nitrogen, carbon dioxide, etc.).

In addition, the outer wall of the corrosive medium box 10 is covered with heat-insulating materials and heating tapes to ensure a constant temperature of the box.

The working principle of this specific embodiment: a very high rigidity four-column structure bracket is adopted, the loading bracket is chrome-plated, the hydraulic piston is hardened and has a high surface processing accuracy to ensure the highest performance of the testing machine, and this specific embodiment The types of corrosive media in the test have been expanded, and the test environment of various media can be simulated; the equipment has a temperature control function, and the test can be carried out in the temperature range of 0-80 °C ± 2 °C; the box insulation system makes the test temperature fluctuation small and the accuracy is high.

The basic principles and main features of the present utility model and the advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (3)

1. A mechanical stress-corrosion coupling fatigue test device is characterized in that it comprises a base (1), a support (2), a motor (3), a reducer (4), a connecting rod (5), a pressure head (6 ), a test piece (7) and a closed corrosion medium box (8), the base (1) is provided with a support (2), the center of the top of the support (2) is provided with a motor (3), and the motor (3) passes through the reducer (4 ) is connected with the connecting rod (5), the end of the connecting rod (5) is provided with an indenter (6), the indenter (6) is in contact with the test piece (7), and the indenter (6) and the test piece (7) are both Set in the closed corrosion medium box (8), the closed corrosion medium box (8) is set on the base (1); the pressure head (6) is a pressure head with a pressure sensor; the closed corrosion medium box (8) Inside is liquid corrosive medium or gas corrosive medium. 2. A mechanical stress-corrosion coupled fatigue test device according to claim 1, characterized in that the sealed corrosion medium box (8) is connected to a heating fan (9). 3. A kind of mechanical stress-corrosion coupling fatigue test device according to claim 1, characterized in that, the outer wall of the corrosive medium casing (8) is covered with an insulating layer (11) and a heating band (10), The heating belt (10) is arranged between the corrosive medium box (8) and the insulation layer (11).