Force-induced luminescence test platform with switchable friction-stretching double excitation modes

Abstract

The invention provides a force-induced luminescence test platform with switchable friction-stretching double excitation modes, which is used for solving the problems of single excitation mode, transient discontinuous excitation process, difficulty in quantitative regulation and control of mechanical excitation parameters, easiness in shielding of light signal acquisition, interference of ambient light and the like in the existing force-induced luminescence test. According to the platform, continuous friction excitation between a sample and a transparent loading component is realized through a rotary friction excitation device, a normal load applying and monitoring device is used for applying normal load to the surface of the sample and monitoring the normal load in real time, and a tensile excitation device is used for applying controllable tensile strain to a mechanoluminescent film; the optical isolation device is used for shielding ambient light interference, and the mechanoluminescence signal acquisition and analysis device is used for carrying out acquisition and data analysis on luminescence signals. According to the invention, independent regulation and switchable testing of two mechanoluminescence modes of friction excitation and tensile excitation are realized, and the method is suitable for performance characterization of the mechanoluminescence film under different excitation mechanisms.

Description

Technical Field

[0001] This invention relates to the field of material performance testing technology, specifically to a mechanoluminescence testing platform with switchable friction-tension dual excitation modes. Background Technology

[0002] Mechanoluminescence refers to the luminescence phenomenon produced by materials when subjected to mechanical forces (including impact, friction, tension, or bending). Because its luminescence behavior is closely related to the loading method, the magnitude of the applied load, and the process of action, mechanoluminescent materials have broad application prospects in stress sensing, structural health monitoring, information visualization, and energy conversion. Therefore, how to conduct stable and repeatable performance tests on mechanoluminescent materials under different mechanical conditions during mechanoluminescence signal acquisition is a key issue in mechanoluminescence performance testing.

[0003] However, existing mechanoluminescence testing devices still have significant shortcomings: First, the mechanical excitation mode is relatively simple, usually only able to apply a single form of mechanical excitation to the material, making it difficult to compare and test the mechanoluminescence behavior under different excitation mechanisms within the same testing platform; Second, existing testing processes mostly employ impact, instantaneous loading, or discontinuous force application methods, resulting in transient and discontinuous excitation characteristics, making it difficult to achieve continuous excitation and stable acquisition of mechanoluminescence signals; Third, the mechanical excitation parameters lack unified and reliable quantitative control and real-time monitoring methods, making it difficult to accurately characterize the actual stress state of the material; Fourth, in some existing devices, the force-bearing end structure is opaque or has a large volume, which can easily block the luminescent area of ​​the material, reducing the light signal acquisition efficiency. At the same time, the testing process is easily affected by ambient light interference, affecting the signal-to-noise ratio of the spectral signal and the repeatability of the test. Summary of the Invention

[0004] This invention proposes a switchable triboelectric-tensile dual-excitation mode mechanoluminescence testing platform, which enables continuous and stable mechanical excitation and real-time monitoring of applied loads. It also possesses efficient continuous optical signal acquisition and ambient light isolation capabilities, overcoming the problems of existing technologies such as single excitation mode, transient discontinuity in the excitation process, difficulty in quantitatively controlling mechanical excitation parameters, and poor stability of optical signal acquisition. The technical solution provided by this invention is as follows:

[0005] A mechanoluminescence testing platform with switchable friction-tension dual excitation modes includes a rotary friction excitation device, a tension excitation device, a normal load application and monitoring device, and a mechanoluminescence signal acquisition and analysis device.

[0006] The rotary friction excitation device includes a first rotary drive device (1) and a fixed stretchable device (3) fixedly connected to its rotary axis. The fixed stretchable device (3) is used to carry and fix the force-luminescent film (301). The first rotary drive device (1) is used to drive the fixed stretchable device (3) to rotate around a preset rotary axis.

[0007] The stretching excitation device includes a second rotary drive device (21), a reciprocating device (22), a first metal clamp (19), and a second metal clamp (20). The first metal clamp (19) is connected to a fourth metal bar (23), which is fixed to a fourth cross clamp (18). The first metal clamp (19) is used to clamp and fix the left side of the stretchable device (3) and keep its position fixed. The second metal clamp (20) is connected to the reciprocating device (22) and is used to clamp and fix the right side of the stretchable device (3), and generates reciprocating displacement under the drive of the reciprocating device (22). The reciprocating device (22) is driven by the second rotary drive device (21).

[0008] The normal load application and monitoring device includes a transparent loading member (7) and a pressure sensor (8). The pressure sensor (8) is rigidly connected to the transparent loading member (7) and is used to monitor the normal load applied by the transparent loading member (7) to the surface of the mechanoluminescent film (301) in real time. The pressure sensor (8) is connected to the third metal bar (14), which is fixed to the second cross-shaped fixing clamp (16). The third cross-shaped fixing clamp (17) is connected to the second metal bar (13) and is used to adjust the height of the transparent loading member (7). The second metal bar (13) is fixed to the first cross-shaped fixing clamp (15).

[0009] The fourth cross-shaped fixing clip (18), the first cross-shaped fixing clip (15), and the second cross-shaped fixing clip (16) are arranged and fixed from bottom to top on the first metal bar (12), and their installation positions can be adjusted in the vertical direction.

[0010] The mechanoluminescence signal acquisition and analysis device includes an optical fiber probe (4) and a spectrometer and data analysis system (6). The optical fiber probe (4) is located inside the transparent loading member (7) and at its bottom. The mechanoluminescence signal acquired by the optical fiber probe (4) is transmitted to the spectrometer and data analysis system (6) via optical fiber.

[0011] Preferably, the first rotary drive device (1) is a rotary stepper motor, which is fixedly installed on the optical table (11) and controlled by a driver and a microcontroller (2).

[0012] Preferably, the fixed stretchable device (3) includes a sample support plate (304), an insert plate (306) disposed on the right side of the sample support plate (304), and a fixing plate (305) respectively located on the upper left side of the sample support plate (304) and on the upper left side of the insert plate (306). The mechanoluminescent film (301) is disposed on the sample support plate (304), with its left end clamped and fixed by the sample support plate (304) and the fixing plate (305) on the upper left side, and its right end clamped and fixed by the insert plate (306) and the corresponding fixing plate (305).

[0013] Preferably, the fixing plate (305) is combined with the sample carrier plate (304) or the insert plate (306) by M6 screws (302) and matching nuts (307) to clamp and fix the mechanoluminescent film (301).

[0014] Preferably, the insert plate (306) is disposed in the guide structure on the right side of the sample support plate (304) and can slide relative to the sample support plate (304) in the horizontal direction; in the rotational friction excitation mode, the insert plate (306) is fully inserted into the guide structure and fixedly connected to the sample support plate (304) by the M4 screw (303) to restrict relative sliding; in the tensile excitation mode, the M4 screw (303) is in the loose state, so that the insert plate (306) can slide relative to the guide structure under the external tensile driving action.

[0015] Preferably, the pressure sensor (8) outputs a load signal in real time during the test and transmits the load signal to the spectrometer and data analysis system (6) to realize the synchronous acquisition and analysis of normal load data and mechanoluminescence optical signal.

[0016] Preferably, a rubber plug (5) is fitted on the outside of the fiber optic probe (4), and the rubber plug (5) is fixedly installed inside the transparent loading member (7) to limit the displacement of the fiber optic probe (4) in the axial and radial directions.

[0017] Preferably, it also includes an optical isolation device, which includes a platform (9) and a light-shielding kit (10). The light-shielding kit (10) is disposed above the platform (9), and its top is provided with a through hole for installing a transparent loading member (7), and its side is provided with a through hole for metal clamps and metal bars to pass through, so as to achieve light-shielding isolation of the test area without affecting the friction excitation and tensile excitation process.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0019] This invention introduces a rotary friction excitation device and a tensile excitation device, enabling independent control and switchable testing of two force-induced emission modes, friction excitation and tensile excitation, on the same platform, effectively overcoming the problem of the single excitation mode in existing testing devices.

[0020] This invention enables the mechanoluminescent material to obtain continuous or periodic mechanical excitation during the stress process by using rotational friction excitation and reciprocating tensile excitation methods. This avoids the problem of discontinuous excitation caused by instantaneous loading and is conducive to the stable acquisition and analysis of luminescent signals.

[0021] This invention, through quantitative control and real-time monitoring of normal load and tensile strain, facilitates the establishment of a reliable correspondence between mechanoluminescence response and mechanical excitation parameters.

[0022] This invention employs a transparent loading component, a light-shielding kit, and a fiber optic probe stabilization structure. This ensures effective transmission of mechanical excitation while avoiding obstruction of the light-emitting area and effectively isolates ambient light interference, significantly improving optical signal acquisition efficiency, signal-to-noise ratio, and test repeatability. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0024] Figure 1 This is a schematic diagram of the overall structure of the mechanoluminescence testing platform proposed in this invention;

[0025] Figure 2 This is a schematic diagram of the fixed stretchable device proposed in this invention;

[0026] Figure 3 This is an embodiment of the invention, showing the mechanoluminescence spectrum of a mechanoluminescent thin film under different normal load conditions in a friction excitation mode;

[0027] Figure 4 This is an embodiment of the invention, showing the mechanoluminescence spectrum of a mechanoluminescent thin film under different strain conditions in a tensile excitation mode.

[0028] List of components and reference numerals: 1. First rotary drive device; 2. Driver and microcontroller; 3. Fixed stretchable device; 4. Fiber optic probe; 5. Rubber plug; 6. Spectrometer and data analysis system; 7. Transparent loading member; 8. Pressure sensor; 9. Loading platform; 10. Light-shielding kit; 11. Optical table; 12. First metal bar; 13. Second metal bar; 14. Third metal bar; 15. First cross clamp; 16. Second cross clamp; 17. Third cross clamp; 18. Fourth cross clamp; 19. First metal clamp; 20. Second metal clamp; 21. Second rotary drive device; 22. Reciprocating device; 23. Fourth metal bar; 301. Methluminescent film; 302. M6 screw; 303. M4 screw; 304. Sample support plate; 305. Fixing plate; 306. Insert plate; 307. Nut. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] To make the above-mentioned objectives, features and effects of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1 As shown, in this embodiment, a mechanical luminescence testing platform with switchable friction-tension dual excitation mode is installed on an optical table (11) to ensure the mechanical stability of the system during the testing process.

[0032] The first rotary drive device (1) is fixedly mounted on the optical table (11), and its output shaft is arranged in the vertical direction. The first rotary drive device (1) is preferably a rotary stepper motor, and is controlled by a driver and a microcontroller (2) to achieve precise setting of the rotation speed and stable output.

[0033] The fixed stretchable device (3) is installed on the output shaft end of the first rotary drive device (1) and can rotate synchronously with the first rotary drive device (1). The fixed stretchable device (3) is used to support and fix the mechanoluminescent film (301) and is a common sample clamping structure in both friction excitation mode and stretch excitation mode.

[0034] like Figure 2As shown, the fixed stretchable device (3) includes a sample support plate (304), an insert plate (306) disposed on the right side of the sample support plate (304), and a fixing plate (305) above it. The sample support plate (304) is an integral structure, and no insert plate is provided on its left side, which is used to form a fixed end during the tensile excitation process.

[0035] Before testing, the mechanoluminescent film (301) is placed on the surface of the sample carrier plate (304). Its left end is clamped and fixed by the sample carrier plate (304) and the corresponding fixing plate (305) through M6 screws (302) and nuts (307), and its right end is clamped and fixed by the insert plate (306) and the corresponding fixing plate (305) through M6 screws (302) and nuts (307), thereby achieving reliable clamping of both ends of the mechanoluminescent film (301).

[0036] The insert plate (306) is located in the guide structure on the right side of the sample support plate (304) and can slide relative to the sample support plate (304) in the horizontal direction, thereby providing displacement freedom for the tensile excitation mode.

[0037] In the friction excitation mode, the insert plate (306) is fully inserted into the corresponding position of the sample support plate (304), and the insert plate (306) and the sample support plate (304) are fixedly connected by M4 screws (303), while keeping all M6 screws (302) and nuts (307) in a tightened state. At this time, the sample support plate (304) and the insert plate (306) maintain structural balance relative to the rotation axis of the first rotary drive device (1) after assembly, which helps to reduce the off-center load or vibration generated during the rotational friction process.

[0038] After the first rotary drive device (1) is started, the fixed stretchable device (3) rotates stably around its rotation axis. The rotation speed is set by the driver and the microcontroller (2) to ensure the continuity and stability of the friction excitation process and to provide controllable mechanical excitation conditions for the mechanoluminescence performance test.

[0039] The normal load application and monitoring device includes a transparent loading member (7) and a pressure sensor (8). The pressure sensor (8) and the transparent loading member (7) are rigidly connected by a threaded structure to monitor the normal load applied to the surface of the mechanoluminescent film (301) in real time.

[0040] The transparent loading member (7) is arranged vertically, with its lower end being the loading end face, and it is in direct contact with the surface of the mechanoluminescent film (301). Under the drive of the first rotation drive device (1), a continuous and controllable relative frictional motion is formed between the mechanoluminescent film (301) and the transparent loading member (7), thereby realizing the mechanoluminescence test under the friction excitation mode.

[0041] By adjusting the installation position of the second cross clamp (16) along the vertical direction of the first metal bar (12), the magnitude of the normal load applied by the pressure sensor (8) to the transparent loading member (7) is adjusted.

[0042] The pressure sensor (8) outputs a load signal in real time during the test and transmits the signal to the spectrometer and data analysis system (6) to achieve synchronous acquisition and analysis of normal load data and mechanoluminescence optical signal.

[0043] In the tensile excitation mode, the first rotary drive device (1) is in a stopped state, and the clamping end on the left side, which is composed of the sample support plate (304) and the fixing plate (305), is fixed by the first metal clamp (19) and remains in the same position. At this time, the M4 screw (303) on the right side is removed so that the insert plate (306) can slide freely relative to the sample support plate (304) in the horizontal direction.

[0044] The tensile excitation device includes a second rotary drive device (21), a reciprocating device (22), a first metal clamp (19), and a second metal clamp (20). The first metal clamp (19) is fixed to the fourth cross clamp (18) by a fourth metal bar (23) and is used to clamp the fixed end on the left side of the sample support plate (304) and keep that side from displacing during the tensile process.

[0045] The second metal clamp (20) is connected to the reciprocating device (22) and is used to clamp the insert plate (306) and its corresponding fixing plate (305). Driven by the second rotary drive device (21), the reciprocating device (22) drives the second metal clamp (20) to move back and forth periodically in the horizontal direction, thereby applying a tensile excitation to the mechanoluminescent film (301).

[0046] The reciprocating device (22) is driven by the second rotary drive device (21) through a rotary-reciprocating conversion mechanism, and its eccentricity is adjustable. By adjusting the eccentricity of the reciprocating device (22), the reciprocating displacement amplitude of the insert plate (306) is controlled, thereby using the strain degree of the mechanoluminescent film (301) as the control variable under the tensile excitation mode.

[0047] In the tensile excitation mode, the height of the transparent loading member (7) is adjusted by the third cross clamp (17) to raise it and avoid contact with the mechanoluminescent film (301), thereby preventing the interference of normal load and friction on the tensile excitation process.

[0048] The transparent loading component (7) is made of a highly transparent material, preferably a transparent quartz tube, which allows the light signal generated by the mechanoluminescent film (301) to be transmitted along its axis while ensuring the integrity of the mechanical structure.

[0049] The fiber optic probe (4) is located at the bottom inside the transparent loading member (7) and arranged along its optical axis to collect optical signals from the light-emitting area of ​​the mechanoluminescent film (301).

[0050] To improve the positioning stability of the fiber optic probe (4) during the test, a rubber plug (5) is fitted on the outside of the fiber optic probe (4). The rubber plug (5) is fixedly installed inside the transparent loading member (7) to limit the displacement of the fiber optic probe (4) in the axial and radial directions and prevent shaking or displacement caused by vibration.

[0051] The mechanoluminescence signal collected by the fiber optic probe (4) is transmitted to the spectrometer and data analysis system (6) via fiber optic cable. The spectrometer is used to perform real-time spectral analysis of the luminescence signal, and the data analysis system is used to process and analyze the spectral intensity, peak position and its relationship with normal load and tensile strain.

[0052] The platform (9) is set on the optical table (11) to support the light-shielding kit (10). The light-shielding kit (10) covers the area where the transparent loading member (7), the mechanoluminescent film (301) and the fiber optic probe (4) are located. It has a through hole on the top for the transparent loading member (7) to pass through, and through holes on the side for the metal clamp and metal bar to pass through, so as to achieve effective light shielding of the test area without affecting the friction excitation and tensile excitation.

[0053] like Figure 3 As shown, under the friction excitation mode, by adjusting the magnitude of the normal load applied to the mechanoluminescent film (301) by the transparent loading member (7), mechanoluminescence spectra were obtained under normal loads of 2N, 4N, 6N, and 8N. The test results show that as the normal load gradually increases, the luminescence intensity of the mechanoluminescent film 301 generally exhibits a monotonically increasing trend, and the emission peak position remains stable, indicating that this test platform can stably and reliably characterize the influence of the normal load on the mechanoluminescence performance under the friction excitation mode.

[0054] like Figure 4 As shown, under the tensile excitation mode, by adjusting the eccentricity of the reciprocating device (22), the mechanoluminescent film (301) was subjected to different tensile strain states of 5%, 10%, 15%, and 20%, respectively, and the mechanoluminescence spectra under the corresponding conditions were obtained. The results show that the mechanoluminescence intensity increases with the increase of tensile strain, indicating that the test platform can stably and reliably characterize the effect of tensile strain on mechanoluminescence performance under the tensile excitation mode.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mechanoluminescence testing platform with switchable friction-tension dual excitation modes, characterized in that, Includes a rotary friction excitation device, a tensile excitation device, a normal load application and monitoring device, and a mechanoluminescence signal acquisition and analysis device; The rotary friction excitation device includes a first rotary drive device (1) and a fixed stretchable device (3) fixedly connected to its rotary axis. The fixed stretchable device (3) is used to carry and fix the force-luminescent film (301). The first rotary drive device (1) is used to drive the fixed stretchable device (3) to rotate around a preset rotary axis. The stretching excitation device includes a second rotary drive device (21), a reciprocating device (22), a first metal clamp (19), and a second metal clamp (20). The first metal clamp (19) is connected to a fourth metal bar (23), which is fixed to a fourth cross clamp (18). The first metal clamp (19) is used to clamp and fix the left side of the stretchable device (3) and keep its position fixed. The second metal clamp (20) is connected to the reciprocating device (22) and is used to clamp and fix the right side of the stretchable device (3), and generates reciprocating displacement under the drive of the reciprocating device (22). The reciprocating device (22) is driven by the second rotary drive device (21). The normal load application and monitoring device includes a transparent loading member (7) and a pressure sensor (8). The pressure sensor (8) is rigidly connected to the transparent loading member (7) and is used to monitor the normal load applied by the transparent loading member (7) to the surface of the mechanoluminescent film (301) in real time. The pressure sensor (8) is connected to the third metal bar (14), which is fixed to the second cross-shaped fixing clamp (16). The third cross-shaped fixing clamp (17) is connected to the second metal bar (13) and is used to adjust the height of the transparent loading member (7). The second metal bar (13) is fixed to the first cross-shaped fixing clamp (15). The fourth cross-shaped fixing clip (18), the first cross-shaped fixing clip (15), and the second cross-shaped fixing clip (16) are arranged and fixed from bottom to top on the first metal bar (12), and their installation positions can be adjusted in the vertical direction. The mechanoluminescence signal acquisition and analysis device includes an optical fiber probe (4) and a spectrometer and data analysis system (6). The optical fiber probe (4) is located inside the transparent loading member (7) and at its bottom. The mechanoluminescence signal acquired by the optical fiber probe (4) is transmitted to the spectrometer and data analysis system (6) via optical fiber.

2. The mechanoluminescence testing platform with switchable friction-tension dual excitation modes according to claim 1, characterized in that, The first rotary drive device (1) is a rotary stepper motor, which is fixedly installed on the optical table (11) and controlled by a driver and a microcontroller (2).

3. The mechanoluminescence testing platform with switchable friction-tension dual excitation modes according to claim 1, characterized in that, The fixed stretchable device (3) includes a sample support plate (304), an insert plate (306) disposed on the right side of the sample support plate (304), and a fixing plate (305) respectively located on the upper left side of the sample support plate (304) and above the insert plate (306). The mechanoluminescent film (301) is disposed on the sample support plate (304), and its left end is clamped and fixed by the sample support plate (304) and the fixing plate (305) on the upper left side, and its right end is clamped and fixed by the insert plate (306) and the corresponding fixing plate (305).

4. The mechanoluminescence testing platform with switchable friction-tension dual excitation modes according to claim 3, characterized in that, The fixing plate (305) is combined with the sample carrier plate (304) or the insert plate (306) by M6 screws (302) and their matching nuts (307) to clamp and fix the mechanoluminescent film (301).

5. The mechanoluminescence testing platform with switchable friction-tension dual excitation modes according to claim 4, characterized in that, The insert plate (306) is located in the guide structure on the right side of the sample support plate (304) and can slide relative to the sample support plate (304) in the horizontal direction. In the rotational friction excitation mode, the insert plate (306) is fully inserted into the guide structure and fixedly connected to the sample support plate (304) by the M4 screw (303), which restricts relative sliding. In the tensile excitation mode, the M4 screw (303) is in the loose state, so that the insert plate (306) can slide relative to the guide structure under the external tensile driving action.

6. The mechanoluminescence testing platform with switchable friction-tension dual excitation modes according to claim 1, characterized in that, The pressure sensor (8) outputs load signals in real time during the test and transmits the load signals to the spectrometer and data analysis system (6) to realize the synchronous acquisition and analysis of normal load data and mechanoluminescence optical signals.

7. The mechanoluminescence testing platform with switchable friction-tension dual excitation modes according to claim 1, characterized in that, A rubber plug (5) is fitted on the outside of the fiber optic probe (4). The rubber plug (5) is fixed inside the transparent loading member (7) to limit the displacement of the fiber optic probe (4) in the axial and radial directions.

8. A mechanoluminescence testing platform with switchable friction-tension dual excitation mode according to any one of claims 1-7, characterized in that, It also includes an optical isolation device, which includes a platform (9) and a light-shielding kit (10). The light-shielding kit (10) is located above the platform (9), with a through hole on its top for mounting a transparent loading member (7) and through holes on its side for inserting metal clamps and metal bars, so as to achieve light-shielding isolation of the test area without affecting the friction excitation and tensile excitation process.

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