CN104034599A

CN104034599A - Experiment system for testing super-high temperature fatigue S-N curve of engine material

Info

Publication number: CN104034599A
Application number: CN201410212071.8A
Authority: CN
Inventors: 熊峻江; 满孜郁; 吕志阳
Original assignee: 北京航空航天大学
Priority date: 2014-05-20
Filing date: 2014-05-20
Publication date: 2014-09-10

Abstract

The invention discloses an experiment system for testing a super-high temperature fatigue S-N curve of an engine material. The experiment system consists of a fatigue experiment machine, an upper test sample clamp, a lower test sample clamp, a cooling machine, a high-temperature furnace and a test sample, wherein the upper test sample clamp and the lower test sample clamp are in threaded connection with the test sample, and then uniform axial loading of the test sample is ensured; the upper test sample clamp and the lower test sample clamp are connected with the experiment machine; the cooling machine is connected with the upper test sample clamp and the lower test sample clamp through a water inlet tube and a water outlet tube; after being moved to a corresponding position, the high-temperature furnace mounted on the fatigue experiment machine wraps the test sample; after the equipment and the devices are integrally abutted, the fatigue experiment testing system of the engine material in a super-high temperature environment is formed. The experiment system is simple in structure, is convenient to operate and is applied to S-N testing on the engine material in the super-high temperature environment, and the testing result has significant engineering application values for structure fatigue service life evaluation.

Description

The pilot system of the tired S-N curve of a kind of test engine material very high temperature

Technical field

The pilot system that the present invention relates to the tired S-N curve of a kind of test engine material very high temperature, belongs to experimental test technical field.

Background technology

Construction material and structure in use, are all being born alternate load, and fatigure failure can occur, and for ensureing its security, need to test its fatigue behaviour, through technical development for many years, have already formed perfect fatigue property test standard; But materials for aeroengines is usually on active service and is used under very high temperature environment, therefore, must measure the tired S-N curve under its very high temperature environment, for assessment of fatigue lifetime.At present, material at high temperature fatigue property test both domestic and external, be mainly for the 350 °～croop property of 650 DEG C of high temperature and the test of low cycle fatigue property, and for the very high temperature environment more than 1000 DEG C, still lack in effectively test, the pilot system of long life fatigue performance.For this reason, plain fatigue testing machine, specimen holder, cooler, high temperature furnace and sample are integrated into the tired S-N curve test macro under very high temperature environment by the present invention,, long life fatigue S-N curve lower for test engine material very high temperature environment, for structure fatigue life, evaluation has important engineering using value to test result.

Summary of the invention

1, object: the object of the present invention is to provide a kind of fatigue test system of test engine material very high temperature S-N curve, the tired S-N curve for test engine material under very high temperature environment.

2, technical scheme: the pilot system of the tired S-N curve of a kind of test engine material of the present invention very high temperature, is made up of fatigue tester, upper and lower specimen holder, cooler, high temperature furnace and sample.Position annexation between them is as follows: specimen holder is arranged on fatigue tester, and cooler is connected with upper and lower specimen holder by inlet tube and outlet tube, and sample is arranged in upper and lower specimen holder; Sample is wrapped in the inside by high temperature furnace.Wherein, fatigue tester, upper and lower specimen holder, cooler and sample link together by series sequence:

Fatigue tester → upper specimen holder → cooler → sample → lower specimen holder → cooler → fatigue tester

Described fatigue tester is routine HF fatigue testing machine, in order to sample is applied to alternation fatigue load, the load range of fatigue tester need be greater than the test load of sample, can be the conventional fatigue tester such as MTS, INSTRON 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 can be together with the threaded engagement of specimen holder, and applies alternation fatigue load.The size and dimension of sample can the standard in (GB3075-82) design with reference to " metal axial fatigue test method ".

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

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

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

All devices, according to after testing requirements connection and debugging, just can complete the torture test under very high temperature environment according to concrete testing requirements.This cover system efficiently solves the tired S-N curve test problem under engine material very high temperature environment.

3, advantage and effect: the invention has the beneficial effects as follows and can complete the torture test test of engine material under very high temperature environment, and this system has the easy to operate and high feature of measuring accuracy.

Brief description of the drawings

Below in conjunction with drawings and Examples, the present invention is further described.

Fig. 1 is the sample schematic diagram for very high temperature torture test.

Fig. 2 is specimen holder schematic diagram.

Fig. 3 is cooler schematic diagram.

Fig. 4 is opposite opened high temperature furnace schematic diagram.

Fig. 5 is fatigue tester schematic diagram.

Fig. 6 is structural representation of the present invention.

In Fig. 6: 1. fatigue tester, 2. upper and lower specimen holder, 3. high temperature furnace, 4. sample, 5. cooler.

Embodiment

Embodiment one: the specific embodiment of the present invention is described in conjunction with Fig. 1 to Fig. 6.The pilot system of the tired S-N curve of a kind of test engine material of the present invention very high temperature, is made up of fatigue tester 1, upper and lower specimen holder 2, high temperature furnace 3, sample 4 and cooler 5.In Fig. 6, upper and lower specimen holder 2 is threaded connection with sample 4, can ensure that sample 4 evenly axially loads; Specimen holder 2 is connected with fatigue tester 1; The high temperature furnace 3 being arranged on fatigue tester 1 moves to behind relevant position, and sample 4 is wrapped in to the inside; Cooler 5 is connected with upper and lower specimen holder 2 respectively by inlet tube and outlet tube; After above equipment and the integrated docking of device, just form the torture test test macro under engine material very high temperature environment.

In very high temperature torture test, the design of sample 4 is very crucial, must be able to ensure evenly to apply axial alternate load, Fig. 1 has specifically provided a kind of bar sample for very high temperature torture test, design screw thread at sample 4 two ends, with the threaded engagement of upper and lower specimen holder 2, can play positioning action.The schematic diagram of upper and lower specimen holder 2 as shown in Figure 2, has a threaded sample mounting hole and two Cooling Holes, and Cooling Holes is used for connecting cooling water pipe.Fatigue tester as shown in Figure 5, can use the commercial fatigue tester such as MTS, INSTRON or self-control fatigue tester.Sample 4 is connected to location with upper and lower specimen holder 2, and upper and lower specimen holder 2 is connected with the fatigue tester 1 that is equipped with high temperature furnace 3, then the cooling water pipe on cooler 5 is connected with the Cooling Holes on upper and lower specimen holder 2.All devices, according to after testing requirements connection and debugging, just can complete the tired S-N curve test under engine material very high temperature environment according to concrete testing requirements.Fig. 3, Fig. 4 are cooler and open type high temperature furnace schematic diagram.

Claims

1. a pilot system for the tired S-N curve of test engine material very high temperature, is characterized in that: it is made up of fatigue tester, upper and lower specimen holder, cooler, high temperature furnace and sample; Specimen holder is arranged on fatigue tester, and cooler is connected with specimen holder by inlet tube and outlet tube, and sample is arranged in specimen holder; Sample is wrapped in the inside by high temperature furnace; Wherein, fatigue tester, upper and lower specimen holder, cooler and sample link together by series sequence:

Described fatigue tester is HF fatigue testing machine, and in order to sample is applied to alternation fatigue load, the load range of fatigue tester need be greater than the test load of sample, is conventional fatigue tester 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 can be together with the threaded engagement of specimen holder, and applies alternation fatigue load; The size and dimension of sample designs with reference to the standard in " metal axial fatigue test method ";

Described upper and lower specimen holder is by being with externally threaded cylinder and tapped cylinder to be combined into one, in order to clamping sample to be installed, there are two Cooling Holes, be used for installing cooling water pipe, need, according to the shape and size Design and manufacture of sample holder end, can and apply alternation fatigue load by sample firm grip;

Described cooler is connected with upper lower clamp by inlet tube and outlet tube, carries pure water to circulate, so that specimen holder is freezed by water pump;

Described high temperature furnace is high temperature resistance silk heating furnace, is and splits tubular, utilizes the heating function of resistance wire to realize the hot environment of the stove heart, and its temperature range will meet testing requirements;

All devices, according to after testing requirements connection and debugging, just can complete the torture test under very high temperature environment according to concrete testing requirements.