Testing device for high-temperature linear expansion coefficient of fiber material
By combining the tensile device and the high-temperature heating device, the problem of difficult to test the high-temperature linear expansion coefficient of fiber materials is solved, and efficient and accurate measurement of linear expansion coefficient is achieved, which simplifies the test process and reduces costs.
Patent Information
- Application Number
- CN202421378943.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-17
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-06-17
AI Technical Summary
The prior art is difficult to efficiently test the linear expansion coefficient of fiber materials at high temperatures, resulting in the lack of important basic data in the design of fiber reinforced metal matrix composite materials and the calculation of residual stress of composite components.
A test device including a tensile device and a high-temperature heating device is designed. By combining a tensile machine and a high-temperature heating furnace, the high-temperature expansion of the fiber sample is monitored in real time, the load-displacement curve is obtained and the linear expansion coefficient is calculated.
It achieves rapid and accurate acquisition of the linear expansion coefficient of the fiber material at high temperatures, improves work efficiency and saves test costs.
Smart Images
Figure CN223154902U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of evaluation of physical properties of fiber materials, and particularly to a test device for the linear expansion coefficient of fiber materials at high temperatures. Background Art
[0002] The coefficient of thermal expansion is the expansion and contraction phenomenon of materials due to temperature changes. It is an important indicator to measure the thermal stability of materials. In actual work, the linear expansion coefficient of materials is generally measured. Therefore, for ordinary materials, especially objects approximately regarded as one-dimensional, the so-called expansion coefficient usually refers to the linear expansion coefficient. In the design of fiber-reinforced metal matrix composites and the calculation of residual stresses in composite components, the linear expansion coefficient of fibers is a very important basic data. Therefore, the measurement of the linear expansion coefficient of fibers at different temperatures is indispensable. There are many methods for measuring the linear expansion coefficient, including the dial gauge method, the optical thermomechanical method, the electromagnetic induction thermomechanical method, etc. Their common feature is that the specimen expands when heated in a heating furnace, and the expansion is transmitted to the detection system through a push rod. Content of the Utility Model
[0003] The purpose of the utility model is to provide a test device for the linear expansion coefficient of fiber materials at high temperatures, which can measure the linear expansion coefficient of fibers at high temperatures.
[0004] In order to achieve the above purpose, the technical solution of the utility model is as follows:
[0005] A test device for the linear expansion coefficient of fiber materials at high temperatures includes a stretching device and a high-temperature heating device. The specific structure is as follows: The stretching device includes a stretching machine and a computer for collecting data, and they are connected by a data cable; the high-temperature heating device includes a high-temperature heating furnace with a bracket at the bottom and a temperature control box, and they are connected by an electric wire. The furnace body of the high-temperature heating furnace is composed of two split furnace doors. Among them: The rear sides of the two furnace doors are hinged by a vertical fixed shaft. The lower end of the fixed shaft of the high-temperature heating furnace is connected to the bracket, and the high-temperature heating furnace is fixed in the stretching machine through the bracket; the front sides of the two furnace doors are locked and connected by a buckle. Semi-cylindrical through holes are relatively arranged vertically in the middle of the inner sides of the two furnace doors, and the two semi-cylindrical through holes are butted to form a cylindrical furnace cavity, and the fiber specimen penetrates through the furnace cavity of the high-temperature heating furnace.
[0006] In the test device for the linear expansion coefficient of fiber materials at high temperatures, a resistance wire is arranged in the high-temperature heating furnace. The resistance wire is located on the inner wall of the high-temperature heating furnace, and the resistance wire is connected to the temperature control box through an electric wire.
[0007] In the test device for the linear expansion coefficient of fiber materials at high temperatures, heat-insulating cotton is arranged in the high-temperature heating furnace. The heat-insulating cotton is located on the inner surface of the high-temperature heating furnace.
[0008] For the testing device of the high-temperature linear expansion coefficient of the fiber material, a thermocouple is provided inside the high-temperature heating furnace. The thermocouple is located in the furnace cavity. The temperature control box sets the temperature required for the test and monitors the temperature inside the high-temperature heating furnace in real time by connecting with the thermocouple.
[0009] The advantages and beneficial effects of the present utility model are as follows:
[0010] 1. The testing device of the present utility model includes a tensile testing machine device and a high-temperature heating device. The tensile testing machine includes a tensile machine main body and a computer for data acquisition. The furnace body of the high-temperature heating device is composed of two split furnace doors. The furnace doors are provided with semi-cylindrical through holes axially opposite to form a cylindrical furnace cavity. During operation, the fiber wire is placed in the cylindrical furnace cavity of the high-temperature heating furnace for heating.
[0011] 2. The present utility model obtains the tensile load-displacement curve at high temperature through relevant data in the high-temperature tensile test, further obtains the linear expansion elongation at this temperature, and calculates the linear expansion coefficient through a formula, which is convenient, fast and saves test costs.
[0012] 3. The present utility model provides a testing device for the high-temperature linear expansion coefficient of the fiber material, obtains the linear expansion elongation required for calculating the linear expansion coefficient while obtaining the high-temperature tensile performance curve, shortens the test cycle and saves test costs, and is simple and easy to operate. Description of the Drawings
[0013] Figure 1 is the structural schematic diagram of the present utility model;
[0014] Figure 2 is the schematic diagram of the high-temperature heating furnace in the present utility model;
[0015] Reference Numerals: 1 - tensile machine, 2 - high-temperature heating furnace, 3 - tensile chuck, 4 - electric wire, 5 - data line, 6 - temperature control box, 7 - computer, 8 - workbench, 9 - buckle, 10 - resistance wire, 11 - support, 12 - thermocouple, 13 - furnace door, 14 - fixed shaft, 15 - semi-cylindrical through hole. Detailed Description of the Invention
[0016] Next, a testing device for the high-temperature linear expansion coefficient of the fiber material will be described in detail with reference to the drawings.
[0017] As Figure 1 - Figure 2 shown, a testing device for the high-temperature linear expansion coefficient of the fiber material includes a tensile device and a high-temperature heating device, and the specific structure is as follows:
[0018] The stretching device includes a stretching machine 1 and a computer 7 for collecting data, which are connected by a data line 5. During the stretching operation, data is collected in real time by the computer 7 and finally plotted into a load-displacement curve. The high-temperature heating device includes a high-temperature heating furnace 2 with a bracket 11 at the bottom and a temperature control box 6, which are connected by an electric wire 4. The furnace body of the high-temperature heating furnace 2 is composed of two split furnace doors 13. Among them: the rear sides of the two furnace doors 13 are hinged by a vertical fixed shaft 14, the lower end of the fixed shaft 14 of the high-temperature heating furnace 2 is connected to the bracket 11, and the high-temperature heating furnace 2 is fixed in the stretching machine 1 through the bracket 11; the front sides of the two furnace doors 13 are locked and connected by a buckle 9. Semi-cylindrical through holes 15 are arranged opposite to each other vertically in the middle of the inner sides of the two furnace doors 13, and the two semi-cylindrical through holes 15 are butted to form a cylindrical furnace cavity, which can ensure that the fiber specimen passes through the furnace cavity of the high-temperature heating furnace 2. A resistance wire 10, heat-insulating cotton and a thermocouple 12 are arranged in the high-temperature heating furnace 2. The resistance wire 10 is located on the inner wall of the high-temperature heating furnace 2, the heat-insulating cotton is located on the inner surface of the high-temperature heating furnace 2, the thermocouple 12 is located in the furnace cavity, and the temperature control box 6 can set the temperature required for the test and monitor the temperature in the high-temperature heating furnace 2 in real time by connecting with the thermocouple 12. The resistance wire 10 of the high-temperature heating furnace 2 is connected to the temperature control box 6 through an electric wire 4, which is convenient for heating the fiber specimen and can heat it evenly. In addition, the computer 7 and the temperature control box 6 are arranged on the workbench 8.
[0019] In the present utility model, the high-temperature heating furnace 2 is designed with split furnace doors 13. After the fiber specimen is clamped by the upper and lower stretching chucks 3 of the stretching machine 1, the furnace doors 13 are opened, which is convenient for moving the fiber specimen into the high-temperature heating furnace 2 and adjusting its position, so that the fiber specimen passes through the entire furnace body through the cylindrical furnace cavity, and then the furnace doors 13 are closed and the furnace doors 13 are locked with the buckle 9.
[0020] During use, the prepared fiber specimen (with a gauge length of 100 mm) is clamped at both ends of the stretching chuck 3 of the stretching machine 1. After clamping, ensure that the fiber is in a straightened state. Then, wrap the furnace cavity of the high-temperature heating furnace 2 around the fiber and close the furnace doors 13. Turn on the power of the temperature control box 6, set the temperature required for the test and start heating. During the heating-up process, the temperature change in the high-temperature heating furnace 2 can be displayed in real time on the temperature control box 6; turn on the computer 7 to collect the data of the stretching test. After reaching the temperature, keep it at a constant temperature for 5 minutes and then start the stretching test. The load-displacement curve at the specified temperature is obtained through the high-temperature stretching test. Due to the influence of high temperature, the fiber expands, so there is a platform in the initial stage of the load-displacement curve, and the load corresponding to the platform is basically zero. The displacement corresponding to this platform is the linear expansion elongation ΔL of the fiber at this temperature. To obtain more accurate results, multiple stretching tests are carried out and the average value is taken. The average value of the obtained linear expansion elongation is calculated, and then it is substituted into the formula for calculation, and the linear expansion coefficient α at this temperature can be obtained. In the formula:
[0021] α - coefficient of linear expansion;
[0022] ΔT - ΔT = T - T0, where T is the test temperature and T0 is the room temperature, taking 20°C;
[0023] ΔL - linear expansion elongation at temperature T (mm);
[0024] L - gauge length of the test fiber specimen (mm).
[0025] The implementation results show that the structure of the utility model is simple and effective. While obtaining the high-temperature tensile curve, the coefficient of linear expansion can be obtained at the same time, greatly improving the working efficiency.
Claims
1. A testing device for the high-temperature linear expansion coefficient of a fiber material, characterized in that, It includes a stretching device and a high-temperature heating device, and the specific structure is as follows: The stretching device includes a stretching machine and a computer for collecting data, and they are connected by a data cable; The high-temperature heating device includes a high-temperature heating furnace with a bracket at the bottom and a temperature control box, and they are connected by an electric wire. The furnace body of the high-temperature heating furnace is composed of two split furnace doors. Among them: The rear sides of the two furnace doors are hinged by a vertical fixed shaft, the lower end of the fixed shaft of the high-temperature heating furnace is connected to the bracket, and the high-temperature heating furnace is fixed in the stretching machine through the bracket; The front sides of the two furnace doors are locked and connected by a buckle. Semi-cylindrical through holes are relatively arranged vertically in the middle of the inner sides of the two furnace doors, and the two semi-cylindrical through holes are butted to form a cylindrical furnace cavity, and the fiber specimen penetrates through the furnace cavity of the high-temperature heating furnace.
2. The test device for the high-temperature linear expansion coefficient of the fiber material according to claim 1, characterized in that There is a resistance wire in the high-temperature heating furnace. The resistance wire is located on the inner wall of the high-temperature heating furnace and is connected to the temperature control box by an electric wire.
3. The test device for the high-temperature linear expansion coefficient of the fiber material according to claim 1, characterized in that, There is heat preservation cotton in the high-temperature heating furnace. The heat preservation cotton is located on the inner surface of the high-temperature heating furnace.
4. The test device for the high-temperature linear expansion coefficient of the fiber material according to claim 1, characterized in that, There is a thermocouple in the high-temperature heating furnace. The thermocouple is located in the furnace cavity. The temperature control box sets the temperature required for the test and monitors the temperature in the high-temperature heating furnace in real time by connecting with the thermocouple.