Composite material actuator cylinder health monitoring sensor and actuator cylinder manufacturing method

Abstract

The invention relates to the technical field of composite material and structure health monitoring, in particular to a composite material actuator cylinder health monitoring sensor and an actuator cylinder manufacturing method. Comprising a first fiber bragg grating sensor and a second fiber bragg grating sensor which is subjected to strain insensitive packaging; the first fiber grating sensor and the second fiber grating sensor are arranged at the same measuring point; the first fiber grating sensor comprises a first optical fiber, and a first grating is inscribed on the first optical fiber; the periphery of the first optical fiber is coated with a first high-temperature-resistant layer; the second fiber grating sensor comprises a second optical fiber and a sleeve, and a second grating is inscribed on the second optical fiber; the periphery of the second optical fiber is coated with a second high-temperature-resistant layer; the sleeve is sleeved on the second optical fiber; a gap is formed between the part, located in the sleeve, of the second optical fiber and the inner wall of the sleeve. According to the invention, decoupling and in-situ measurement of strain and temperature can be realized on the premise that the original state in the structure is not changed.

Description

Technical Field

[0001] The present disclosure relates to the technical field of composite materials and structural health monitoring, and in particular to a composite material actuator health monitoring sensor and an actuator manufacturing method. Background Art

[0002] In modern industry, composite actuators are widely used in aerospace, automotive and industrial automation fields due to their light weight, high strength and corrosion resistance. However, since the composite structure of composite materials and metal linings is prone to damage such as delamination, cracks and fiber breakage under complex loads and long-term use, these damages are difficult to detect early through traditional detection methods. Therefore, structural health monitoring (SHM) technology is particularly important in the application of composite actuators, which is used to monitor and evaluate the structural status in real time to ensure the safety and reliability of the actuator.

[0003] At present, the mainstream methods for monitoring the structural health of composite materials include ultrasonic testing, acoustic emission, fiber optic sensors, external sensors, etc. Ultrasonic testing is a contact non-destructive testing method that detects damage and defects in materials based on the difference in reflection, attenuation and resonance of ultrasonic waves in composite materials in damaged defect areas and intact areas. Acoustic emission technology is also a relatively mature non-destructive testing technology. Its essence is to passively detect elastic waves generated when defects are formed or developed, and it can realize real-time online dynamic monitoring of composite material damage. The fiber optic sensing method is to bury the fiber grating inside the composite material and detect the structural changes of the composite material by measuring the incident spectrum, transmission spectrum and reflection spectrum.

[0004] There are also some external sensors such as resistance strain gauges, displacement gauges and piezoelectric sensors installed on the surface of composite structures to form a sensor network to monitor external impacts on the structure, structural strain and possible damage within the structure.

[0005] Ultrasonic detection is a point measurement method, and the approximate location of the damage must be known in advance. Acoustic emission technology is easily affected by environmental noise. The external sensor is relatively independent of the structure itself. The large number of sensors increases the weight of the structure and the difficulty of installation, which limits the signal processing. In addition, the monitoring capability in actual working conditions is insufficient, and it is impossible to conduct long-term health monitoring of the structure. As for the fiber optic sensing method, since the fiber grating is sensitive to both temperature and strain, and the bare optical fiber is relatively fragile, there are also problems such as how to decouple the measurement of temperature and strain cross-sensitivity and how to protect the buried optical fiber. Summary of the invention

[0006] The present disclosure is proposed in view of the above problems. The present disclosure provides a composite material actuator health monitoring sensor and an actuator manufacturing method.

[0007] According to one aspect of the present disclosure, a composite material actuator health monitoring sensor is provided, which includes a first fiber grating sensor and a second fiber grating sensor that is strain-insensitively packaged;

[0008] The first fiber grating sensor and the second fiber grating sensor are used to be arranged at the same measuring point; the second fiber grating sensor is used to measure the temperature compensation amount at the measuring point;

[0009] The first fiber grating sensor comprises a first optical fiber, on which a first grating is engraved; the outer periphery of the first optical fiber is coated with a first high temperature resistant layer;

[0010] The second fiber grating sensor comprises a second optical fiber and a sleeve, a second grating is engraved on the second optical fiber; the outer periphery of the second optical fiber is coated with a second high temperature resistant layer;

[0011] The sleeve is sleeved on the second optical fiber, and the area of ​​the second optical fiber having the second grating is located in the sleeve; there is a gap between the part of the second optical fiber located in the sleeve and the inner wall of the sleeve, so that the part of the second optical fiber located in the sleeve is not affected by external stress.

[0012] The composite actuator health monitoring sensor as described above, wherein, optionally, the sleeve is a stainless steel capillary.

[0013] The composite actuator health monitoring sensor as described above, wherein, optionally, both ends of the sleeve are sealed by DG-4 two-component epoxy glue.

[0014] The composite actuator health monitoring sensor as described above, wherein, optionally, decoupling of strain and stress is achieved by separating the center wavelength drift detected by the first fiber grating sensor from the center wavelength drift detected by the second fiber grating sensor.

[0015] The composite actuator health monitoring sensor as described above, wherein, optionally, the sleeve has a wall thickness of 0.1 to 0.3 mm, an outer diameter of 0.6 to 0.8 mm, and a length of 9 to 11 mm.

[0016] The composite material actuator health monitoring sensor as described above, wherein, optionally, the first optical fiber has the same parameters as the second optical fiber. The present disclosure proposes a composite material actuator manufacturing method, wherein the method comprises the following steps:

[0017] S1, continuously writing a fiber grating sensor array into a first optical fiber and a second optical fiber having the same parameters to form a first grating and a second grating respectively;

[0018] S2, coating a high temperature resistant layer on the outer periphery of the first optical fiber and the second optical fiber, so that the high temperature resistant layer covers the first grating and the second grating respectively;

[0019] S3, performing strain-insensitive packaging on the second optical fiber;

[0020] S4, rough machining the metal lining surface of the actuator;

[0021] S5, cleaning the outer surface of the metal lining with an organic solvent and applying shear glue on the winding surface;

[0022] S6, installing a winding tool to wind a fiber tape on a winding surface of the metal lining;

[0023] S7, when the winding reaches the position where the first fiber grating sensor or the second fiber grating sensor is embedded, pausing the winding;

[0024] S8, after fixing the first fiber grating sensor and the second fiber grating sensor to a set position, continue the winding process;

[0025] S9, repeating step S7 and step S8 until all the first fiber grating sensors and the second fiber grating sensors are pre-buried;

[0026] S10, pressurizing, curing and surface treating the actuator.

[0027] In the manufacturing method of the composite material actuator as described above, optionally, in step S3, the method of strain-insensitively packaging the second optical fiber includes:

[0028] The second grating on the second optical fiber is encapsulated in a stainless steel capillary, and both ends of the stainless steel capillary are sealed.

[0029] The manufacturing method of the composite material actuator as described above, wherein, optionally, in step S4, when rough machining the metal lining surface of the actuator, a design margin of 1 mm is retained for solution treatment to improve its comprehensive mechanical properties, and sandblasting is performed to increase the roughness and enhance the physical connection performance with the composite material layer.

[0030] The manufacturing method of the composite material actuator as described above, wherein optionally, in step S6, the method of winding the fiber tape on the winding surface of the metal liner surface is to use a tensioned fiber tape to wet-wind along 90° or 45°, the 0° layup is laid using fiber prepreg cloth, and the layups at various angles are laid using alternating circumferential winding layers and longitudinal winding layers.

[0031] As will be described in detail below, according to the composite actuator health monitoring sensor of the embodiment of the present disclosure, by performing strain-insensitive packaging on the second fiber grating sensor, it is possible to use the second fiber grating sensor as temperature compensation to achieve decoupling of strain and temperature. It is possible to achieve decoupling and in-situ measurement of strain and temperature without changing the original state of the internal structure. It has a simple structure, high cost-effectiveness, and is easy to achieve long-term health monitoring of composite structural parts.

[0032] It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the technology as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and other purposes, features and advantages of the present disclosure will become more apparent by describing the embodiments of the present disclosure in more detail in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the present disclosure and do not constitute a limitation of the present disclosure. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0034] Figure 1 A schematic diagram of the structure of the first fiber Bragg grating sensor proposed in the present disclosure;

[0035] Figure 2 A schematic diagram of the structure of a second fiber Bragg grating sensor proposed in the present disclosure;

[0036] Figure 3 A schematic diagram of the structure of the second fiber grating sensor embedded in the actuator cylinder proposed in the present disclosure;

[0037] Figure 4 The present invention provides a flowchart of the steps of the composite material actuator manufacturing method.

[0038] Description of reference numerals:

[0039] 1-first fiber grating sensor, 2-second fiber grating sensor, 3-actuator;

[0040] 11-first optical fiber, 12-first grating, 13-first high temperature resistant layer;

[0041] 21 - second optical fiber, 22 - sleeve, 23 - second grating, 24 - second high temperature resistant layer. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present disclosure more obvious, the exemplary embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments of the present disclosure, and it should be understood that the present disclosure is not limited to the exemplary embodiments described here.

[0043] In view of the problems raised in the background technology, the present disclosure proposes the following implementation methods:

[0044] According to some embodiments of the present disclosure, a composite material actuator health monitoring sensor is proposed. Figure 1 and Figure 2 , including a first fiber Bragg grating sensor 1 and a second fiber Bragg grating sensor 2 that has been subjected to a strain-insensitive package. The first fiber Bragg grating sensor 1 has not been subjected to a strain-insensitive package, and its detection result is affected by both strain and temperature. The second fiber Bragg grating sensor 2 has been subjected to a strain-insensitive package, and its detection result is only affected by strain. Therefore, through the detection results of the first fiber Bragg grating sensor 1 and the detection results of the second fiber Bragg grating sensor 2, the decoupling of temperature and strain can be achieved, making the detection result more accurate.

[0045] The first fiber grating sensor 1 and the second fiber grating sensor 2 are used to be arranged at the same measuring point; the second fiber grating sensor 2 is used to measure the temperature compensation at the measuring point; in this way, it is easy to decouple strain and temperature and realize in-situ measurement, which is easy to realize long-term health monitoring of composite material structures.

[0046] In a specific implementation, the first fiber grating sensor 1 includes a first optical fiber 11, on which a first grating 12 is engraved; the periphery of the first optical fiber 11 is coated with a first high temperature resistant layer 13. The first high temperature resistant layer 13 is coated with polyimide to meet the requirements of long-term high temperature monitoring. In a specific implementation, the grating area length of the first grating 12 is 2mm, the interval between adjacent gratings is 20mm, the interval between adjacent grating wavelengths is 6nm, the reflectivity is 85%, and the central wavelength is 1550nm. In a specific implementation, the size and central wavelength can be designed according to actual needs.

[0047] The second fiber grating sensor 2 includes a second optical fiber 21 and a sleeve 22. The second optical fiber 21 is engraved with a second grating 23. The outer periphery of the second optical fiber 21 is coated with a second high temperature resistant layer 24. The second high temperature resistant layer 24 is made of polyimide coating to meet the requirements of long-term high temperature monitoring. In specific implementation, the grating area length of the second grating 23 is 2mm, the interval between adjacent gratings is 20mm, the interval between adjacent grating wavelengths is 6nm, the reflectivity is 85%, and the central wavelength is 1550nm. In specific implementation, the size and central wavelength can be designed according to actual needs.

[0048] The sleeve 22 is sleeved on the second optical fiber 21, and the area of ​​the second optical fiber 21 having the second grating 23 is located in the sleeve 22; there is a gap between the portion of the second optical fiber 21 located in the sleeve 22 and the inner wall of the sleeve 22, so that the portion of the second optical fiber 21 located in the sleeve 22 is not affected by external stress. The sleeve 22 is used for packaging to prevent the detection structure of the second grating 23 of the second optical fiber 21 from being affected by stress.

[0049] By encapsulating the second fiber grating sensor 2 as strain-insensitive and measuring the measuring points together with the first fiber grating sensor 1, the result measured by the first fiber grating sensor 1 is the result measured by the first fiber grating sensor 1 under the condition of temperature and force causing strain, while the second fiber grating sensor 2 is located in the casing 22 and is not affected by the strain. The detection result of the first fiber grating sensor 1 is subtracted from the detection result of the second fiber grating sensor 2, which can decouple the strain and temperature, thereby realizing long-term and accurate health monitoring of composite material structures.

[0050] In a specific implementation, the sleeve 22 is a stainless steel capillary, and there is a certain gap between the portion of the second optical fiber 21 located inside the sleeve 22 and the inner wall of the sleeve 22, so that when the sleeve 22 is subjected to force and deforms to a certain extent, the second optical fiber 21 inside it is not subjected to force, that is, during the measurement process, the second optical fiber 21 does not deform, so that the second fiber grating sensor 2 is insensitive to strain. Specifically, the decoupling of strain and stress is achieved by separating the center wavelength drift detected by the first fiber grating sensor 1 and the center wavelength drift detected by the second fiber grating sensor 2.

[0051] In the specific implementation, in order to create a loose environment for the second optical fiber 21 in the sleeve 22 and prevent it from being strained by stress, the two ends of the sleeve 22 are sealed by DG-4 two-component epoxy glue. In this way, on the one hand, other substances are prevented from entering the sleeve 22 and squeezing the second optical fiber 21 inside the sleeve 22; on the other hand, support is formed at both ends of the sleeve 22 to prevent the sleeve 22 from being flattened and squeezing the second optical fiber 21.

[0052] In the specific implementation, in order to reduce the impact on the internal structure of the actuator 3, when the sleeve 22 is provided, the size of the sleeve 22 is further designed. Specifically, the sleeve 22 has a wall thickness of 0.1 to 0.3 mm, an outer diameter of 0.6 to 0.8 mm, and a length of 9 to 11 mm. Specifically, the sleeve 22 has a wall thickness of 0.2 mm, an outer diameter of 0.7 mm, and a length of 10 mm.

[0053] In practical applications, for the convenience of calculation, the first optical fiber 11 has the same parameters as the second optical fiber 21. The parameters include grating length, adjacent grating interval, reflectivity, and adjacent grating wavelength. In a preferred embodiment, the grating length is 2 mm, the adjacent grating interval is 20 mm, the adjacent grating wavelength interval is 6 nm, and the reflectivity is 85%.

[0054] According to some other embodiments of the present disclosure, a composite material actuator manufacturing method is proposed, please refer to Figure 3 and Figure 4 , which includes the following steps:

[0055] S1, continuously write the fiber Bragg grating sensor array in the first optical fiber 11 and the second optical fiber 21 with the same parameters to form the first grating 12 and the second grating 23 respectively. In the specific implementation, the first optical fiber 11 and the second optical fiber 21 have the same size, and in practical applications, the reflectivity and other parameters of the first optical fiber 11 and the second optical fiber 21 are also the same.

[0056] S2, coating a high temperature resistant layer on the outer periphery of the first optical fiber 11 and the second optical fiber 21, so that the high temperature resistant layer covers the first grating 12 and the second grating 23 respectively.

[0057] S3, perform strain-insensitive packaging on the second optical fiber 21; in specific implementation, in this step, the second grating 23 on the second optical fiber 21 is packaged in a stainless steel capillary, and both ends of the stainless steel capillary are sealed. The size of the stainless steel capillary and the specific structure after packaging can refer to the composite actuator health monitoring sensor in the above embodiment.

[0058] S4, rough machining the metal lining surface of the actuator 3; in specific implementation, when rough machining the metal lining surface of the actuator 3, retain a design margin of 1 mm for solid solution treatment to improve its comprehensive mechanical properties, and perform sandblasting to increase the roughness and enhance the physical connection performance with the composite material layer.

[0059] S5, the outer surface of the metal lining is cleaned with an organic solvent, and shear glue is applied on the winding surface; in the specific implementation, the outer surface of the entire metal lining is cleaned with an organic solvent before starting the winding, high-strength shear glue is applied on the winding surface, and a release agent is applied on the non-winding surface.

[0060] S6, installing the winding tooling, winding the fiber tape on the winding surface of the metal lining surface; the method of winding the fiber tape on the winding surface of the metal lining surface is to use the fiber tape with tension to wet-wind along 90° or 45°, the 0° ply is laid with fiber prepreg cloth, and the plies at various angles are laid in a manner of alternately winding the circumferential winding layer and the longitudinal winding layer.

[0061] S7, when the winding reaches the position where the first fiber grating sensor 1 or the second fiber grating sensor 2 is pre-buried, the winding is stopped.

[0062] S8, after fixing the first fiber grating sensor 1 and the second fiber grating sensor 2 to the set position, continue the winding process. Specifically, the two ends of the engraved fiber grating sensor array are pre-tensioned by the tension loading mechanism, the position of the grating area is determined and marked, the fiber grating sensor is laid at the position to be measured and the optical fiber is lightly pressed, and the viscosity of the composite material layer itself is used or some matrix resin of the composite material can be applied on the surface of the optical fiber to fix it.

[0063] S9, repeating steps S7 and S8 until all the first fiber grating sensors 1 and the second fiber grating sensors 2 are pre-buried. Control the optical fiber to pass through the winding interval, and fix the optical fiber lead wire with a high temperature resistant tape to keep it at a predetermined lead-out position.

[0064] S10, pressurize and cure the actuator 3 and perform surface treatment. After the processing is completed, remove the tooling, clean the residual glue, enter the curing furnace to complete the pressurized curing, and perform post-processing such as cutting, trimming, grinding, and surface treatment according to the design requirements, and pay attention to protecting the fiber grating. Arrange the optical fiber lead and connect it to the demodulator and computer; in addition, the parameters such as the center wavelength, reflectivity, grating area length, grating spacing, and adjacent grating wavelength spacing of the fiber grating sensor array are not fixed, and should be adjusted according to the specific composite material structure; in addition, the optical fiber lead-out method generally adopts surface lead-out or end face lead-out, which should be determined according to the structural characteristics or subsequent needs. Certain protection is required at the exit. Put the optical fiber lead into a Teflon protective sleeve, and seal the two ends of the sleeve with 703 silicone rubber to protect the optical fiber lead-out part so that it will not become brittle or break due to other external forces caused by the flow of resin during the component molding process.

[0065] The basic principles of the present disclosure are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present disclosure are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present disclosure. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, and are not limitations. The above details do not limit the present disclosure to the necessity of adopting the above specific details to be implemented.

[0066] The block diagrams of the devices, apparatuses, equipment, and systems involved in this disclosure are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including," "comprising," "having," and the like are open words, referring to "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or," and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0067] Additionally, as used herein, "or" used in a list of items beginning with "at least one" indicates a separate list, so that, for example, a list of "at least one of A, B, or C" means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). Furthermore, the word "exemplary" does not mean that the example described is preferred or better than other examples.

[0068] It should also be noted that in the system and method of the present disclosure, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present disclosure.

[0069] Various changes, substitutions, and modifications of the techniques described herein may be made without departing from the teachings defined by the appended claims. Furthermore, the scope of the claims of the present disclosure is not limited to the specific aspects of the processes, machines, manufactures, compositions of events, means, methods, and actions described above. Currently existing or later to be developed processes, machines, manufactures, compositions of events, means, methods, or actions that perform substantially the same functions or achieve substantially the same results as the corresponding aspects described herein may be utilized. Thus, the appended claims include such processes, machines, manufactures, compositions of events, means, methods, or actions within their scope.

[0070] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0071] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A composite material actuator health monitoring sensor, characterized in that: It comprises a first fiber grating sensor (1) and a second fiber grating sensor (2) which is subjected to strain-insensitive packaging; The first fiber grating sensor (1) and the second fiber grating sensor (2) are used to be arranged at the same measuring point; the second fiber grating sensor (2) is used to measure the temperature compensation amount at the measuring point; The first fiber grating sensor (1) comprises a first optical fiber (11), on which a first grating (12) is engraved; the outer periphery of the first optical fiber (11) is coated with a first high temperature resistant layer (13); The second fiber grating sensor (2) comprises a second optical fiber (21) and a sleeve (22); a second grating (23) is engraved on the second optical fiber (21); and the outer periphery of the second optical fiber (21) is coated with a second high temperature resistant layer (24); The sleeve (22) is sleeved on the second optical fiber (21); the area of ​​the second optical fiber (21) having the second grating (23) is located inside the sleeve (22); there is a gap between the part of the second optical fiber (21) located inside the sleeve (22) and the inner wall of the sleeve (22), so that the part of the second optical fiber (21) located inside the sleeve (22) is not affected by external stress.

2. The composite material actuator health monitoring sensor according to claim 1, characterized in that: The sleeve (22) is a stainless steel capillary tube.

3. The composite material actuator health monitoring sensor according to claim 1, characterized in that: Both ends of the sleeve (22) are sealed by DG-4 two-component epoxy glue.

4. The composite material actuator health monitoring sensor according to claim 1, characterized in that: Decoupling of strain and stress is achieved by combining the central wavelength drift detected by the first fiber grating sensor (1) with the central wavelength drift detected by the second fiber grating sensor (2).

5. The composite material actuator health monitoring sensor according to claim 1, characterized in that: The sleeve (22) has a wall thickness of 0.1 to 0.3 mm, an outer diameter of 0.6 to 0.8 mm, and a length of 9 to 11 mm.

6. The composite material actuator health monitoring sensor according to any one of claims 1 to 5, characterized in that: The first optical fiber (11) and the second optical fiber (21) have the same parameters.

7. A method for manufacturing a composite material actuator, characterized in that: The following steps are involved: S1, continuously writing a fiber grating sensor array into a first optical fiber (11) and a second optical fiber (21) having the same parameters, to form a first grating (12) and a second grating (23), respectively; S2, coating a high temperature resistant layer on the outer periphery of the first optical fiber (11) and the second optical fiber (21), so that the high temperature resistant layer covers the first grating (12) and the second grating (23) respectively; S3, performing strain-insensitive packaging on the second optical fiber (21); S4, rough machining the metal lining surface of the actuator (3); S5, cleaning the outer surface of the metal lining with an organic solvent and applying shear glue on the winding surface; S6, installing a winding tool to wind a fiber tape on a winding surface of the metal lining; S7, when the winding reaches the position where the first fiber grating sensor (1) or the second fiber grating sensor (2) is pre-buried, the winding is stopped; S8, after fixing the first fiber grating sensor (1) and the second fiber grating sensor (2) to a set position, continue the winding process; S9, repeating step S7 and step S8 until all the first fiber grating sensors (1) and the second fiber grating sensors (2) are pre-buried; S10, pressurizing, curing and surface treating the actuator (3).

8. The method for manufacturing a composite material actuator according to claim 7, characterized in that: In step S3, the method for performing strain-insensitive packaging on the second optical fiber (21) comprises: The second grating (23) on the second optical fiber (21) is encapsulated in a stainless steel capillary, and both ends of the stainless steel capillary are sealed.

9. The method for manufacturing a composite material actuator according to claim 7, characterized in that: In step S4, when the surface of the metal lining of the actuator (3) is rough-machined, a design margin of 1 mm is reserved for solution treatment to improve its comprehensive mechanical properties, and sandblasting is performed to increase the roughness and enhance the physical connection performance with the composite material layer.

10. The method for manufacturing a composite material actuator according to claim 7, characterized in that: In step S6, the method of winding the fiber tape on the winding surface of the metal lining surface is to use a tensioned fiber tape to wet-wind along 90° or 45°, 0° plying is done by fiber prepreg, and plying at each angle is done by alternating circumferential winding layers and longitudinal winding layers.

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