Plate shell fatigue testing device under high-temperature and high-humidity environment

Abstract

The invention relates to the technical field of fatigue testing, and discloses a plate shell fatigue testing device in a high-temperature and high-humidity environment, which comprises an environment simulation system used for providing a testing environment for a tested sample; the environment simulation system comprises a closed test cabin, and a temperature simulation module, a humidity simulation module and a circulating fan which are arranged in the closed test cabin, the temperature simulation module is used for simulating a temperature environment, the humidity simulation module is used for simulating a humidity environment, and the circulating fan is used for circulating air in the closed test cabin; the loading and clamping system is used for clamping and loading the tested sample; and the data monitoring system is used for monitoring the fatigue test data of the tested sample, so that a high-temperature and high-humidity severe environment in which the tested sample is located can be simulated, the authenticity of the fatigue test can be improved, and the reliability of the fatigue test data of the tested sample can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fatigue test, in particular to a plate shell fatigue test device under high temperature and high humidity environment. BACKGROUND

[0002] Composite plate shells have been widely used in aerospace, rail transportation and high-end equipment manufacturing due to their lightweight, high strength, corrosion resistance and excellent mechanical properties. Such structures are often subjected to complex alternating loads during actual service and are in harsh environments such as high temperature and high humidity, which are prone to fatigue damage and micro-crack propagation. Therefore, it is of great significance to carry out bending vibration fatigue test under high temperature and high humidity conditions for the design optimization and service life evaluation of composite plate shells. Existing plate shell fatigue test devices under high temperature and high humidity environment mainly focus on mechanical property research under normal temperature conditions, and the environmental simulation function is limited, which makes it difficult to truly reproduce the complex working conditions of composite plate shells in service environment, thereby affecting the reliability of fatigue test data. SUMMARY

[0003] The purpose of the present application is to provide a plate shell fatigue test device under high temperature and high humidity environment to improve the reliability of fatigue test data of the test sample.

[0004] To achieve the above-mentioned purpose, the present application provides the following scheme: A plate shell fatigue test device under high temperature and high humidity environment, comprising: An environment simulation system for providing a test environment for a test sample; the environment simulation system comprises a sealed test cabin, a temperature simulation module, a humidity simulation module and a circulating fan arranged in the sealed test cabin, the temperature simulation module is used for simulating temperature environment, the humidity simulation module is used for simulating humidity environment, and the circulating fan is used for circulating air in the sealed test cabin; A loading and clamping system for clamping and loading the test sample; A data monitoring system for monitoring fatigue test data of the test sample.

[0005] Further, the temperature simulation module comprises a heater, a refrigeration unit, a temperature sensor and a controller; the temperature sensor is used for monitoring the air temperature in the sealed test cabin; the heater is used for heating the air in the sealed test cabin; the refrigeration unit is used for refrigerating the air in the sealed test cabin; the heater, the refrigeration unit and the temperature sensor are electrically connected with the controller to control the air temperature in the sealed test cabin.

[0006] Further, the humidity simulation module comprises a humidity sensor, a humidifier, a dehumidifier and the controller; the humidity sensor is used for monitoring the air humidity in the closed test cabin; the humidifier is used for increasing the humidity of the air in the closed test cabin; the dehumidifier is used for dehumidifying the air in the closed test cabin; the humidity sensor, the humidifier and the dehumidifier are electrically connected with the controller to control the air humidity in the closed test cabin.

[0007] Further, the loading and clamping system comprises a clamping assembly, a rack and a bending vibration loading assembly arranged on the rack, the clamping assembly is used for clamping the test sample, and the bending vibration loading assembly is used for loading periodic bending vibration load on the clamped test sample.

[0008] Further, the bending vibration loading assembly comprises a driving device, a transmission shaft, an eccentric wheel and a connecting rod, the driving device is arranged on the rack, an output end of the driving device is connected with one end of the transmission shaft through a shaft coupling, the eccentric wheel is arranged on the transmission shaft, the eccentric wheel is connected with one end of the connecting rod, and the other end of the connecting rod is connected with the clamping assembly to load periodic bending vibration on the test sample clamped by the clamping assembly.

[0009] Further, the number of the eccentric wheels is two, and the two eccentric wheels are arranged at intervals.

[0010] Further, the clamping assembly comprises a bottom plate, a cross beam, a slide rail and a movable clamping seat, the other end of the connecting rod is connected with the bottom of the bottom plate, two cross beams are arranged at intervals on the bottom plate, the two cross beams are connected through two slide rails arranged at intervals, the movable clamping seat is sleeved on the slide rail, and the movable clamping seat is used for clamping the test sample.

[0011] Further, the movable clamping seat comprises a fixed part, a clamping part and a connecting piece, the fixed part is sleeved on the slide rail, one end of the clamping part is fixedly connected with the fixed part, an arc-shaped clamping surface is arranged on the clamping part, a flexible buffer layer is arranged on the arc-shaped clamping surface, and the number of the clamping parts is two, which are arranged in correspondence with each other, and the two clamping parts arranged in correspondence with each other are detachably connected through the connecting piece to clamp the test sample.

[0012] Further, the data monitoring system comprises a strain gauge and a displacement sensor, the strain gauge is arranged on a key stress area of the surface of the test sample to monitor the stress / strain of the test sample, and the displacement sensor is arranged at the other end of the connecting rod to monitor the bending vibration loading amplitude.

[0013] Further, the data monitoring system further comprises an acoustic emission sensor arranged on the surface of the test sample for capturing acoustic signals of the crack initiation and propagation process.

[0014] According to the above description, the present application has the following technical effects: The present application provides a kind of high temperature and high humidity environment under plate shell fatigue testing device, by environment simulation system, for providing test environment for test sample;Environment simulation system includes sealed test cabin, and temperature simulation module, humidity simulation module and circulating fan arranged in sealed test cabin, temperature simulation module is used to simulate temperature environment, humidity simulation module is used to simulate humidity environment, circulating fan is used to circulate air in sealed test cabin;Loading clamping system is used to clamp and load test sample;Data monitoring system is used to monitor the fatigue test data of test sample, compared with prior art, environment simulation system can simulate the harsh environment of high temperature and high humidity where test sample is located, it is favorable to improve the authenticity of fatigue test, in turn, it is favorable to improve the reliability of fatigue test data of test sample. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 The high temperature and high humidity environment under plate shell fatigue testing device provided by the embodiment of the present application is shown in the axial view. Figure 2 The loading clamping system provided by the embodiment of the present application is shown in the axial view. Figure 3 The clamping assembly provided by the embodiment of the present application is shown in the axial view. Wherein, 1-environment simulation system;2-loading clamping system;3-clamping assembly;4-excentric wheel;5-connecting rod;6-transmission shaft;7-servo motor;8-moving clamp holder;9-slideway;10-bolt;11-test sample;12-rack. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0018] The embodiment of the present specification provides a plate shell fatigue test device under high temperature and high humidity environment, which comprises: Figure 1 As shown in the figure, it comprises: an environment simulation system 1 for providing a test environment for the test sample 11; the environment simulation system 1 comprises a sealed test cabin, the sealed test cabin adopts a stainless steel double-layer heat preservation structure, an outer layer is covered with a heat insulation layer, the sealed test cabin is used for providing a sealed environment for the test sample 11, and a temperature simulation module, a humidity simulation module and a circulating fan arranged in the sealed test cabin, the temperature simulation module is used for simulating a temperature environment, the humidity simulation module is used for simulating a humidity environment, and the circulating fan is used for circulating air in the sealed test cabin; a loading and clamping system 2 for clamping and loading the test sample 11, the loading mode is mainly periodic bending vibration loading; a data monitoring system for monitoring fatigue test data of the test sample 11. In the embodiment of the present specification, the test sample 11 is a composite material plate shell, and the environment simulation system 1 can simulate the harsh environment of high temperature and high humidity in which the test sample 11 is located, which is beneficial to improve the authenticity of the fatigue test, and further beneficial to improve the reliability of the fatigue test data of the test sample 11.

[0019] The temperature simulation module comprises: a heater, a refrigeration unit, a temperature sensor and a controller; the temperature sensor is used for monitoring the air temperature in the sealed test cabin; the heater is used for heating the air in the sealed test cabin; the refrigeration unit is used for refrigerating the air in the sealed test cabin; the heater, the refrigeration unit and the temperature sensor are all electrically connected with the controller to control the air temperature in the sealed test cabin. The controller controls whether to start the heater or the refrigeration unit according to the temperature monitoring value of the temperature sensor, so as to ensure that the air temperature in the sealed test cabin is at 40-80℃. The refrigeration unit can adopt a refrigeration device widely used in the prior art, and the heater can adopt a heating device widely used in the prior art, so as to simulate the temperature environment of the fatigue test of the test sample 11 (composite material plate shell).

[0020] The humidity simulation module comprises: a humidity sensor, a humidifier, a dehumidifier and a controller; the humidity sensor is used for monitoring the air humidity in the sealed test cabin; the humidifier is used for increasing the humidity of the air in the sealed test cabin; the dehumidifier is used for dehumidifying the air in the sealed test cabin; the humidity sensor, the humidifier and the dehumidifier are all electrically connected with the controller to control the air humidity in the sealed test cabin. The controller controls whether to start the humidifier and the dehumidifier according to the humidity value monitored by the humidity sensor, so as to ensure that the air humidity in the cabin is in a relatively stable environment of 60%-90% RH, so as to ensure that the test sample is tested under the real service working condition, thereby being beneficial to improve the reliability of the test data.

[0021] As shown in the figure, Figure 2As shown, the loading and clamping system 2 comprises a clamping assembly 3 for clamping the test sample 11, a rack 12, and a bending vibration loading assembly arranged on the rack 12 for loading the clamped test sample 11 with periodic bending vibration load. The bending vibration loading assembly can stably load in the frequency range of 0.1-20 Hz, and the loading amplitude is adjustable to simulate various working conditions, which is beneficial to improve the accuracy of fatigue test.

[0022] The bending vibration loading assembly comprises a driving device, a transmission shaft 6, an eccentric wheel 4, and a connecting rod 5. The driving device is arranged on the rack 12, the output end of the driving device is connected with one end of the transmission shaft 6 through a shaft coupling, the eccentric wheel 4 is arranged on the transmission shaft 6, the eccentric wheel 4 is connected with one end of the connecting rod 5, and the other end of the connecting rod 5 is connected with the clamping assembly 3 to perform periodic bending vibration loading on the test sample 11 clamped by the clamping assembly 3. The driving device is a servo motor 7. After the servo motor 7 drives the eccentric wheel 4 to rotate, the connecting rod 5 is driven to reciprocate, thereby performing periodic bending vibration loading on the test sample 11.

[0023] The number of eccentric wheels 4 is two, and the two eccentric wheels 4 are arranged at intervals. The number of eccentric wheels 4 can be changed according to the size and shape of the test sample 11, and can be one or more, which can be set according to the actual situation and the testing requirements of the device.

[0024] As shown in the figure, Figure 3 The clamping assembly 3 comprises a base plate, a cross beam, a slide rail 9, and a movable clamp seat 8. The other end of the connecting rod 5 is connected with the bottom of the base plate, two cross beams are arranged at intervals on the base plate, the two cross beams are connected through two slide rails 9 arranged at intervals, and the movable clamp seat 8 is sleeved on the slide rail 9. In this way, the position of the movable clamp seat 8 on the same slide rail 9 can be adjusted according to the size of the test sample 11, and the movable clamp seat 8 is used for clamping the test sample 11.

[0025] The movable clamp seat 8 comprises a fixed part, a clamping part, and a connecting piece. The fixed part is sleeved on the slide rail 9, one end of the clamping part is fixedly connected with the fixed part, an arc-shaped clamping surface is arranged on the clamping part, a flexible buffer layer is arranged on the arc-shaped clamping surface, and the flexible buffer layer is preferably a rubber buffer layer. The design of flexible clamping surface + arc-shaped contact + rubber buffer layer can keep uniform stress during the vibration loading process, and avoid local stress concentration to cause damage to the test sample, compared with the traditional rigid clamp. The number of clamping parts is two, and the two clamping parts are arranged in correspondence. The two clamping parts arranged in correspondence are detachably connected through the connecting piece to clamp the test sample 11. The connecting piece is preferably a bolt 10 and a nut, and the test sample 11 is fixed on the movable clamp seat 8 through the bolt 10 and the nut, and the movable clamp seat 8 is fixed on the slide rail 9.

[0026] The data monitoring system comprises a strain gauge and a displacement sensor, the strain gauge is arranged on the key stress area of the surface of the test sample, and is used for monitoring the stress / strain of the test sample; the displacement sensor is arranged on the other end of the connecting rod 5, and is used for monitoring the bending vibration loading amplitude; the data monitoring system further comprises an acoustic emission sensor, the acoustic emission sensor is arranged on the surface of the test sample, and is used for capturing the acoustic signals in the crack initiation and expansion process, so that the comprehensive real-time monitoring of the multiple physical quantities is realized, and the accuracy of the monitoring data is improved. In addition, the controller of the present application can realize unified time base and linkage calibration, so that the environmental parameters and the mechanical responses are recorded and adjusted in the same acquisition and control framework, thereby realizing the causal correlation and traceable analysis of the environment-load-damage signals, and helping to establish a more reliable fatigue life model in service.

[0027] The various embodiments are described in a progressive manner in the specification, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. For the system disclosed by the embodiments, since it corresponds to the method disclosed by the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0028] The principles and implementation manners of the present application are described by using specific examples in the specification, and the above embodiment description is only used to help understand the method of the present application and its core idea; meanwhile, for the general technical personnel in the art, according to the idea of the present application, the specific implementation manner and application range will be changed. In summary, the content of the specification should not be understood as the limitation of the present application.

Claims

1. A high-temperature high-humidity environment plate shell fatigue test device, characterized in that, The application relates to an environmental simulation system for providing a test environment for a test sample, comprising a closed test cabin, a temperature simulation module, a humidity simulation module and a circulating fan arranged in the closed test cabin, the temperature simulation module being used for simulating a temperature environment, the humidity simulation module being used for simulating a humidity environment, and the circulating fan being used for circulating air in the closed test cabin. The application also relates to a loading and clamping system for clamping and loading the test sample. The application also relates to a data monitoring system for monitoring fatigue test data of the test sample. The temperature simulation module comprises a heater, a refrigeration unit, a temperature sensor and a controller, the temperature sensor being used for monitoring air temperature in the closed test cabin, the heater being used for heating air in the closed test cabin, the refrigeration unit being used for refrigerating air in the closed test cabin, and the heater, the refrigeration unit and the temperature sensor being electrically connected with the controller to control air temperature in the closed test cabin.

2. The apparatus according to claim 1, wherein The humidity simulation module comprises a humidity sensor, a humidifier, a dehumidifier and the controller, the humidity sensor being used for monitoring air humidity in the closed test cabin, the humidifier being used for increasing humidity of air in the closed test cabin, the dehumidifier being used for dehumidifying air in the closed test cabin, and the humidity sensor, the humidifier and the dehumidifier being electrically connected with the controller to control air humidity in the closed test cabin.

3. The apparatus according to claim 2, wherein The loading and clamping system comprises a clamping assembly, a rack and a bending vibration loading assembly arranged on the rack, the clamping assembly being used for clamping the test sample, and the bending vibration loading assembly being used for loading the clamped test sample with periodic bending vibration load.

4. The apparatus according to claim 1, wherein The bending vibration loading assembly comprises a driving device, a transmission shaft, an eccentric wheel and a connecting rod, the driving device being arranged on the rack, an output end of the driving device being connected with one end of the transmission shaft through a shaft coupling, the eccentric wheel being arranged on the transmission shaft, the eccentric wheel being connected with one end of the connecting rod, and the other end of the connecting rod being connected with the clamping assembly to load the clamped test sample with periodic bending vibration.

5. The apparatus according to claim 4, wherein The number of the eccentric wheels is two, and the two eccentric wheels are arranged at intervals.

6. The high temperature high humidity environment under panel fatigue test apparatus according to claim 5, wherein The clamping assembly comprises a bottom plate, a cross beam, a slide rail and a movable clamping seat, the other end of the connecting rod is connected with the bottom plate, two cross beams are arranged at intervals on the bottom plate, the two cross beams are connected through two slide rails arranged at intervals, the movable clamping seat is sleeved on the slide rail, and the movable clamping seat is used for clamping the test sample.

7. The apparatus according to claim 4, wherein The movable clamping seat comprises a fixed part, a clamping part and a connecting piece, the fixed part is sleeved on the slide rail, one end of the clamping part is fixedly connected with the fixed part, an arc-shaped clamping surface is arranged on the clamping part, a flexible buffer layer is arranged on the arc-shaped clamping surface, the number of the clamping parts is two, the two clamping parts are arranged in correspondence with each other, and the two clamping parts arranged in correspondence with each other are detachably connected through the connecting piece to clamp the test sample.

8. The high temperature high humidity environment under panel fatigue test apparatus according to claim 7, wherein ​ 9. The high temperature high humidity environment plate shell fatigue testing device according to any one of claims 5-8, characterized in that, The data monitoring system comprises a strain gauge and a displacement sensor, the strain gauge is arranged on a key stress area of the surface of the test sample to monitor stress and strain of the test sample, and the displacement sensor is arranged on the other end of the connecting rod to monitor the amplitude of the bending vibration load.

10. The high temperature high humidity environment under panel fatigue test apparatus according to claim 9, wherein, The data monitoring system further comprises an acoustic emission sensor arranged on the surface of the test sample to capture acoustic signals of the crack initiation and propagation process.

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