CN105021468A - High-temperature creep fatigue test system - Google Patents

Abstract

A high-temperature creep fatigue test system is composed of a fatigue testing machine, a sample fixture, a high-temperature furnace, a sample, a high-temperature extensometer, a cooling machine and a main control computer. The upper and lower sample fixtures are connected to the sample through threads, which can ensure uniform axial loading of the sample; the sample fixture is connected to the fatigue testing machine; the high-temperature extensometer is connected to the sample through claws; the high-temperature furnace installed on the fatigue testing machine After moving to the corresponding position, wrap the sample inside; the cooling machine is connected to the upper and lower sample fixtures respectively through the inlet and outlet pipes; the fatigue testing machine and the high-temperature extensometer are connected to the main control computer, and the main control computer reads The high temperature extensometer measures the strain in real time and controls the fatigue testing machine, so that the strain controlled high temperature creep fatigue test can be carried out. The beneficial effect of the invention is that it can measure the deformation of the material in the high-temperature creep fatigue test, and has the characteristics of convenient operation and high measurement accuracy.

Description

A High Temperature Creep Fatigue Test System

technical field

The invention relates to a high-temperature creep fatigue test system, which belongs to the technical field of test and test.

Background technique

Engineering materials and structures, especially aero-engine materials, are often used in high-temperature environments. At present, the testing of high-temperature performance of materials at home and abroad is mainly the testing of high-temperature creep performance and stress-controlled high-temperature fatigue performance. For high-temperature creep, fatigue There is still a lack of an effective test system for testing material properties under interaction. For this reason, the present invention integrates conventional fatigue testing machine, sample fixture, high temperature extensometer, high temperature furnace, chiller, sample and main control computer into a kind of high temperature creep fatigue test system, which can be used for materials under high temperature environment based on Strain-controlled creep fatigue performance test, the test results have important engineering application value for structural fatigue life assessment.

Contents of the invention

1. Purpose: The purpose of the present invention is to provide a high-temperature creep fatigue test system for testing the creep fatigue performance of materials in high-temperature environments.

2. Technical solution: a high-temperature creep fatigue test system of the present invention is composed of a fatigue testing machine, a sample fixture, a high-temperature extensometer, a high-temperature furnace, a cooling machine, a sample and a main control computer. The position connection relationship between them is as follows: the sample fixture is installed on the fatigue testing machine; the cooling machine is connected to the sample fixture through the inlet and outlet pipes, and the sample is installed in the sample fixture; the high temperature extensometer is connected to the sample through the jaws ; The high-temperature furnace wraps the sample inside; the fatigue testing machine and the high-temperature extensometer are connected with the main control computer.

The fatigue testing machine is a conventional low-frequency fatigue testing machine, which is used to apply alternating fatigue loads to the sample. The load range of the fatigue testing machine needs to be greater than the test load of the sample, and can be conventional fatigue testing machines such as MTS and INSTRON. Or self-made fatigue testing machine.

The sample is a bar fatigue sample of various materials and types. The sample is a dumbbell-shaped round bar with threads at both ends. The threads at both ends of the sample can be matched with the threads of the sample holder, and Apply alternating fatigue loads. The size and shape of the sample can be designed according to the standards in the "Metal High Temperature Tensile Creep Test Method" (HB5151-96).

The sample fixture is a combination of a cylinder with an external thread and a cylinder with an internal thread, which is used to install and clamp the sample. There are two cooling holes for installing the cooling water pipe. It needs to be clamped according to the sample The shape and dimensions of the ends are designed and manufactured to securely clamp the specimen and apply alternating fatigue loads.

The high temperature extensometer is a mechanical lead rod high temperature extensometer, which can measure the strain of the sample under high temperature in real time.

The high-temperature furnace is a high-temperature resistance wire heating furnace, which is in the shape of a split cylinder. The heating function of the resistance wire can be used to realize the high-temperature environment of the furnace core, and its temperature range must meet the test requirements.

The cooler is connected with the upper and lower fixtures through the water inlet and outlet pipes, and the pure water is circulated by the water pump to cool the sample fixtures.

The main control computer is a conventional electronic computer, which can read the data of the high temperature extensometer and control the fatigue testing machine by installing the corresponding program.

After all devices are connected and debugged according to the test requirements, the high temperature creep fatigue test can be completed according to the specific test requirements.

3. Advantages and effects: the beneficial effect of the present invention is that it can measure the deformation of materials in the high-temperature creep fatigue test, and has the characteristics of convenient operation and high measurement accuracy.

Description of drawings

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

Figure 1 is a schematic diagram of a sample used in a high temperature creep fatigue test.

Figure 2 is a schematic diagram of the sample fixture.

Figure 3 is a schematic diagram of a high temperature extensometer.

Figure 4 is a schematic diagram of a high temperature furnace.

Figure 5 is a schematic diagram of the cooling machine.

Fig. 6 is a schematic diagram of a fatigue testing machine.

Fig. 7 is a schematic diagram of a high temperature creep fatigue test system of the present invention.

In Fig. 7: 1. fatigue testing machine, 2. sample fixture, 3. high temperature furnace, 4. sample, 5. high temperature extensometer, 6. cooling machine.

Detailed ways

Specific Embodiment 1: A specific embodiment of the present invention will be described with reference to FIG. 1 to FIG. 7 . A high-temperature creep fatigue test system of the present invention is composed of a fatigue testing machine 1, a sample fixture 2, a high-temperature furnace 3, a sample 4, a high-temperature extensometer 5, a cooling machine 6 and a main control computer. In Fig. 7, the upper and lower sample fixtures 2 and the sample 4 are connected by threads to ensure uniform axial loading of the sample 4; the sample fixture 2 is connected to the fatigue testing machine 1; the high temperature extensometer 5 is connected to the test The high temperature furnace 3 installed on the fatigue testing machine 1 is moved to the corresponding position, and the sample 4 is wrapped inside; the cooling machine 6 is connected with the upper and lower sample fixtures 2 respectively through the inlet and outlet pipes; the fatigue testing machine 1 and the high-temperature extensometer 5 are connected to the main control computer, and the main control computer reads the strain measured by the high-temperature extensometer in real time and controls the fatigue testing machine, so that the strain-controlled high-temperature creep fatigue test can be performed.

In the high temperature creep fatigue test, the design of sample 4 is very critical, and it must be able to ensure that the axial alternating load is applied uniformly. Figure 1 specifically shows a bar sample used in the extreme high temperature fatigue test. Threads are designed at both ends, which cooperate with the threads of the fixture to play a positioning role. The schematic diagram of sample fixture 2 is shown in Figure 2, which has a threaded sample mounting hole and two cooling holes, which are used to connect cooling water pipes. The schematic diagram of the high-temperature extensometer 5 is shown in Figure 3. The displacement can be converted into an electrical signal by connecting the jaws to the sample, so as to measure the strain of the sample in a high-temperature environment in real time. The schematic diagram of the high-temperature furnace 3 is shown in Figure 4. It is a high-temperature resistance wire heating furnace in the shape of a split cylinder. The heating function of the resistance wire can be used to realize the high-temperature environment of the furnace core, and its temperature range must meet the test requirements. As the fatigue testing machine 1 is shown in FIG. 6 , a commercial fatigue testing machine such as MTS and INSTRON or a self-made fatigue testing machine can be used. Connect and position the sample 1 with the sample holder 2, connect the sample holder 2 with the fatigue testing machine 1 equipped with a high temperature furnace 3, connect the high temperature extensometer 5 with the sample, connect the cooling water pipe on the cooling machine 6 with the The cooling holes on the sample fixture 2 are connected, and then the fatigue testing machine and the high temperature extensometer are connected to the main control computer. After all the devices are connected and debugged according to the test requirements, the high temperature creep fatigue test of the material can be completed according to the specific test requirements.

Claims (1)

1. a high-temerature creep fatigue test system, is characterized in that: it is made up of fatigue tester, specimen holder, high-temperature extensometer, high temperature furnace, cooler, sample and main control computer.Position annexation between them is as follows: specimen holder is arranged on fatigue tester; Cooler is connected with specimen holder by inlet tube and outlet tube, and sample is arranged in specimen holder; High-temperature extensometer is connected with sample by claw; Sample is wrapped in the inside by high temperature furnace; Fatigue tester is all connected with main control computer with high-temperature extensometer.

Described fatigue tester is routine low-frequency fatigue test machine, in order to apply reversed fatigue load to sample, the load range of fatigue tester need be greater than the test load of sample, can be the fatigue testers such as MTS, INSTRON of routine or self-control fatigue tester.

Described sample is the bar fatigue testing specimen of various different materials and type, and this sample is dumbbell shaped pole, and there is screw thread at two ends, and the screw thread at sample two ends together with the threaded engagement of specimen holder, and can apply reversed fatigue load.The size and dimension of sample can design with reference to the standard in " metallic high temperature tensile test method " (HB5151-96).

Described specimen holder is combined into one by the externally threaded cylinder of band and tapped cylinder, in order to install clamping sample, there are two Cooling Holes, for installing cooling water pipe, need according to the shape and size Design and manufacture of sample holder end, sample firm grip can be applied reversed fatigue load.

Described high-temperature extensometer is that a kind of mechanical type draws bar high-temperature extensometer, can measure sample strain at high temperature in real time.

Described high temperature furnace is high temperature resistance silk heating furnace, and in splitting tubular, the heating function of resistance wire can be utilized to realize the hot environment of the stove heart, and its temperature range will meet testing requirements.

Described cooler is connected with upper lower clamp by inlet tube and outlet tube, carries pure water to circulate, to freeze to specimen holder by water pump.

Described main control computer is conventional robot calculator, by installing corresponding program, can read the data of high-temperature extensometer and controlling fatigue tester.