Composite material and preparation method thereof as well as health condition detection method and device

Abstract

The invention relates to a composite material and a preparation method thereof, and a health condition detection method and device. The composite material comprises a basalt fiber grid; the plurality of fiber bragg grating sensors are embedded in the basalt fiber grid, the plurality of fiber bragg grating sensors are arranged in a single row or a plurality of rows, and the row direction is parallel to the fiber radial direction of the basalt fiber grid; and the plurality of fiber bragg grating sensors are used for detecting the health condition of the basalt fiber grid.

Description

Technical Field

[0001] This disclosure relates to the field of materials technology, and in particular to a composite material and its preparation method, as well as a health status detection method and apparatus. Background Technology

[0002] Basalt fiber mesh is widely used in civil engineering reinforcement due to its lightweight, high strength, and corrosion resistance. However, existing monitoring methods struggle to achieve real-time, non-destructive monitoring of its internal condition, resulting in a lag in structural safety assessment. Summary of the Invention

[0003] This disclosure provides a composite material and its preparation method, a health status detection method and apparatus, to address the shortcomings of related technologies.

[0004] According to a first aspect of the present disclosure, a composite material is provided, comprising:

[0005] Basalt fiber mesh;

[0006] Multiple fiber Bragg grating sensors are embedded in the basalt fiber mesh. The multiple fiber Bragg grating sensors are arranged in a single column or multiple columns, and the column direction is parallel to the radial direction of the fibers of the basalt fiber mesh. The multiple fiber Bragg grating sensors are used to detect the health status of the basalt fiber mesh.

[0007] Optionally, multiple fiber Bragg grating sensors are arranged at equal intervals in the column direction.

[0008] Optionally, multiple fiber Bragg grating sensors are arranged in a multi-row, multi-column array.

[0009] According to a second aspect of the present disclosure, a method for preparing a composite material is provided, applicable to the composite material described in any of the foregoing embodiments, the preparation method comprising:

[0010] Fiber Bragg grating sensors are embedded in uncured basalt fiber mesh;

[0011] The composite material is obtained by curing an uncured basalt fiber mesh embedded with the fiber Bragg grating sensor.

[0012] Optionally, the curing treatment of the uncured basalt fiber mesh to obtain the composite material includes:

[0013] An uncured basalt fiber mesh embedded with the fiber Bragg grating sensor is immersed in a styrene-acrylic emulsion;

[0014] Vacuum-assisted forming process is used to eliminate air bubbles;

[0015] The composite material is cured in a constant temperature chamber for a preset time to form a three-dimensional mesh.

[0016] Optional, also includes:

[0017] A polyurethane protective layer is coated on the surface of the cured composite material.

[0018] According to a second aspect of the present disclosure, a method for detecting the health status of a composite material is provided, applied to the composite material as described in any of the foregoing embodiments, wherein the area where the plurality of fiber Bragg grating sensors are located is divided into a plurality of location regions, each location region is provided with at least two fiber Bragg grating sensors, and adjacent location regions do not have overlapping areas.

[0019] The health status detection method includes:

[0020] The wavelength offset output by multiple fiber Bragg grating sensors set in the same location area is obtained, and the multiple fiber Bragg grating sensors in the same location area are in the same strain field and temperature field.

[0021] The strain of the basalt fiber mesh in the same location region is obtained based on multiple wavelength offsets, temperature sensitivity coefficients, and strain sensitivity coefficients.

[0022] The health status of the composite material is determined based on the strain.

[0023] Optionally, the temperature sensitivity coefficients and / or strain sensitivity coefficients of multiple fiber Bragg grating sensors located in the same area may be at least partially different.

[0024] The method of obtaining the strain of the basalt fiber mesh in the same location region based on multiple wavelength offsets, temperature sensitivity coefficients, and strain sensitivity coefficients includes:

[0025] For each fiber Bragg grating sensor in any location region, establish a linear equation between wavelength offset, temperature sensitivity coefficient, strain sensitivity coefficient, strain, and temperature change, where strain and temperature change are unknowns.

[0026] The strain of the corresponding region of the basalt fiber mesh is solved by combining multiple linear equations.

[0027] Optionally, in the first fiber Bragg grating sensor and the second fiber Bragg grating sensor set in the same location area, the first fiber Bragg grating sensor only detects the amount of temperature change;

[0028] The method of obtaining the strain of the basalt fiber mesh in the same location region based on multiple wavelength offsets, temperature sensitivity coefficients, and strain sensitivity coefficients includes:

[0029] For each second fiber Bragg grating sensor in any location region, a linear equation is established between wavelength offset, temperature sensitivity coefficient, strain sensitivity coefficient, strain, and temperature change, where strain and temperature change are unknowns.

[0030] Obtain the temperature change detected by the first fiber Bragg grating sensor;

[0031] Based on the temperature change and the linear equation, the strain of the corresponding region of the basalt fiber mesh is solved.

[0032] Optionally, at least one temperature sensor is provided in each of the aforementioned location areas;

[0033] The method of obtaining the strain of the basalt fiber mesh in the same location region based on multiple wavelength offsets, temperature sensitivity coefficients, and strain sensitivity coefficients includes:

[0034] For each fiber Bragg grating sensor based on the location region, a linear equation is established between wavelength offset, temperature sensitivity coefficient, strain sensitivity coefficient, strain, and temperature change, where strain and temperature change are unknowns.

[0035] The temperature change is obtained based on the temperature sensor.

[0036] Based on the temperature change and the linear equation, the strain of the corresponding region of the basalt fiber mesh is solved.

[0037] Optionally, determining the health status of the composite material based on the strain variable includes:

[0038] Compare the dependent variable with the baseline value;

[0039] When the difference between the dependent variable and the baseline value is greater than or equal to a set threshold, the health condition of the composite material is determined to be damaged.

[0040] The damage location of the composite material is located based on the location region corresponding to the strain.

[0041] Optionally, determining the health status of the composite material based on the strain variable includes:

[0042] A two-dimensional strain image between the strain and the location parameters is constructed based on the location parameters and strain in multiple location regions.

[0043] Based on the two-dimensional strain image, the health status of the composite material is determined;

[0044] When the health condition of the composite material is determined to be damaged, the damage location is located based on the two-dimensional strain image.

[0045] Optional, also includes:

[0046] Acquire the location region where the health status is damaged;

[0047] Based on the location region in the damaged state, the damage length of the composite material in the radial direction of the fiber is obtained according to the spacing between adjacent fiber Bragg grating sensors in the radial direction of the composite material fiber and the number of fiber Bragg grating sensors; and / or, the damage length of the composite material in the direction perpendicular to the radial direction of the fiber is obtained according to the spacing between adjacent fiber Bragg grating sensors in the direction perpendicular to the radial direction of the composite material fiber and the number of fiber Bragg grating sensors.

[0048] Optional, also includes:

[0049] When the health status of the composite material is determined to be damaged based on the strain variable, the damage type of the location area corresponding to the strain variable is located based on the change characteristics of the strain variable within a set time period.

[0050] Optionally, the damage type for locating the location region corresponding to the strain based on the variation characteristics of the strain within a set time period includes at least one of the following:

[0051] When the strain change characteristic is a drastic change in strain in a single location area, and no further strain change can be detected, the damage type of the location area corresponding to the strain is determined to be fiber breakage.

[0052] The strain variation characteristics are multi-location region strain weakening, and the damage type of the multi-location region is determined to be fiber delamination;

[0053] The strain variation characteristic is a jittery strain variation, and the damage type of the location area corresponding to the strain is determined to be fiber microcracks.

[0054] The characteristic of the strain change is a decrease in the strain change rate, and the damage type of the location area corresponding to the strain is determined to be uneven colloid distribution.

[0055] According to a third aspect of the present disclosure, a health status detection device for composite materials is provided, which is applied to the composite material as described in any of the foregoing embodiments, wherein the area where the plurality of fiber Bragg grating sensors are located is divided into a plurality of location regions, each location region is provided with at least two fiber Bragg grating sensors, and adjacent location regions do not have overlapping areas.

[0056] The health status detection device includes:

[0057] The first acquisition module acquires the wavelength offset output by multiple fiber Bragg grating sensors set in the same location area, wherein the multiple fiber Bragg grating sensors in the same location area are in the same strain field and temperature field.

[0058] The second acquisition module acquires the strain of the basalt fiber mesh in the same location area based on multiple wavelength offsets, temperature sensitivity coefficients, and strain sensitivity coefficients.

[0059] The determination module determines the health status of the composite material based on the strain variable.

[0060] According to a fourth aspect of the present disclosure, a computer-readable storage medium is provided that stores computer instructions thereon, which, when executed by a processor, implement the steps of the method as described in any of the foregoing embodiments.

[0061] According to a fifth aspect of the present disclosure, an electronic device is provided, comprising:

[0062] processor;

[0063] A fiber Bragg grating demodulator, wherein the fiber Bragg grating demodulator is electrically connected to the fiber Bragg grating sensor of the composite material described in any of the foregoing embodiments, and the fiber Bragg grating demodulator is electrically connected to the processor;

[0064] Memory used to store processor-executable instructions;

[0065] The processor is configured to perform the steps described in any of the foregoing embodiments of the method when executing.

[0066] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0067] As can be seen from the above embodiments, this disclosure achieves the integrated setup of the fiber Bragg grating sensor and the basalt fiber mesh by embedding the fiber Bragg grating sensor. Subsequently, the fiber Bragg grating sensor can be used to perform non-destructive health monitoring of composite materials in real time. The fiber Bragg grating sensor is not subject to electromagnetic interference, which can improve the application scenarios of composite materials and broaden their engineering applicability.

[0068] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0069] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0070] Figure 1This is a schematic diagram of a three-dimensional fiber mesh of a composite material according to an exemplary embodiment.

[0071] Figure 2 This is a schematic diagram illustrating the position of a fiber and fiber Bragg grating sensor of a composite material according to an exemplary embodiment.

[0072] Figure 3 This is a method for preparing a composite material according to an exemplary embodiment.

[0073] Figure 4 This is a flowchart illustrating a method for detecting the health status of a composite material according to an exemplary embodiment.

[0074] Figure 5 This is a schematic diagram illustrating the division of a location area according to an exemplary embodiment.

[0075] Figure 6 This is a block diagram illustrating a health status detection device for composite materials according to an exemplary embodiment. Detailed Implementation

[0076] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0077] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0078] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0079] Figure 1This is a schematic diagram of a three-dimensional fiber mesh of a composite material according to an exemplary embodiment. Figure 2 This is a schematic diagram illustrating the position of fibers and a fiber Bragg grating sensor made of a composite material according to an exemplary embodiment. Figure 1 and Figure 2 As shown, the composite material includes a basalt fiber mesh 1 and a fiber Bragg grating sensor 2. The composite material may include multiple fiber Bragg grating sensors 2, and the fiber Bragg grating sensors 2 are embedded in the basalt fiber mesh 1, realizing the integrated setting of the fiber Bragg grating sensors 2 and the basalt fiber mesh 1.

[0080] The multiple fiber Bragg grating sensors 2 are arranged in a single or multiple columns, and the column direction of the fiber Bragg grating sensors 2 is parallel to the radial direction of the basalt fiber mesh, avoiding cross-twisting between the fiber Bragg grating sensors 2 and facilitating the distributed layout of the monitoring network. These multiple fiber Bragg grating sensors 2 can be used to detect the health status of the basalt fiber mesh 1.

[0081] This configuration, through the embedding of the fiber Bragg grating sensor 2, achieves integrated setup with the basalt fiber mesh 1. Subsequently, the fiber Bragg grating sensor 2 can be used for real-time, non-destructive health monitoring of the composite material. The fiber Bragg grating sensor 2 is unaffected by electromagnetic interference, expanding the application scenarios of the composite material and broadening its engineering applicability. Furthermore, the fiber Bragg grating sensor 2 enables simultaneous monitoring of multiple parameters with an accuracy of ±1με and a temperature resolution of 0.1℃.

[0082] In some embodiments, multiple fiber Bragg grating sensors 2 are arranged at equal intervals in the column direction. For example, in the radial direction of the basalt fiber mesh 1, in the column direction of the multiple fiber Bragg grating sensors 2, the spacing between two adjacent fiber Bragg grating sensors 2 is 10cm, or 5cm, 20cm, etc., and can be designed as needed.

[0083] In some other embodiments, to broaden the health monitoring range of the composite material, the multiple fiber Bragg grating sensors 2 can be arranged in a multi-row, multi-column array to form a distributed monitoring network for health monitoring of various regions of the composite material.

[0084] Based on the composite materials in the foregoing embodiments, this disclosure also provides a method for preparing a composite material, which can be applied to the composite materials described in any of the foregoing embodiments. For example... Figure 3 As shown, the preparation method may include the following steps:

[0085] In step 301, the fiber Bragg grating sensor is embedded in the uncured basalt fiber mesh.

[0086] In this embodiment, an uncured basalt fiber mesh 1 is selected, for example, a basalt fiber mesh 1 with a basis weight of 300 g / m² can be selected. The fiber Bragg grating sensor 2 is embedded based on this uncured basalt fiber mesh 1. The flexibility of the uncured basalt fiber mesh 1 enables the non-destructive embedding of the fiber Bragg grating sensor 2, avoiding damage to the composite material caused by traditional drilling or adhesive methods.

[0087] For uncured basalt fiber mesh 1, after determining the fiber radial direction, multiple fiber Bragg grating sensors 2 can be arranged side by side with equal spacing along the fiber radial direction. The number of fiber Bragg grating sensors 2 in each column can be adaptively designed according to the fiber length and spacing.

[0088] In step 302, the basalt fiber mesh embedded with the fiber Bragg grating sensor and which is not cured is cured to obtain the composite material.

[0089] In this embodiment, since the fiber Bragg grating sensor 2 is embedded during the curing process of the uncured basalt fiber mesh 1, the curing process can achieve the integration of the fiber Bragg grating sensor 2 and the basalt fiber mesh 1, thus enabling the composite material to perform both reinforcement and health monitoring functions.

[0090] For the curing process, the uncured basalt fiber mesh 1, embedded with a fiber Bragg grating sensor 2, is immersed in a styrene-acrylic emulsion to ensure uniform penetration of the emulsion into the interfiber spaces of the basalt fiber mesh 1. Then, a vacuum-assisted molding process is used to remove air bubbles, followed by curing in a constant temperature chamber to form a three-dimensional mesh of the composite material. The vacuum level in the vacuum-assisted molding process can be -0.1 MPa, and the curing time in the constant temperature chamber can be 24 hours or longer.

[0091] In some other embodiments, a polyurethane protective layer can be coated onto the surface of the cured composite material to protect it. For example, a polyurethane protective layer with a thickness of 0.3 mm, 0.5 mm, or 0.8 mm can be coated to enhance the environmental durability and corrosion resistance of the composite material.

[0092] Based on the technical solution of this disclosure, a method for detecting the health status of composite materials is also provided. This detection method can be applied to any of the aforementioned composite materials. Furthermore, the area where multiple fiber Bragg grating sensors 2 are located can be divided into multiple location regions. Each location region is provided with at least two fiber Bragg grating sensors 2. The number of fiber Bragg grating sensors 2 in different location regions can be equal or unequal, and adjacent location regions do not have overlapping areas.

[0093] like Figure 4 As shown, this health status detection method may include the following steps:

[0094] In step 401, the wavelength offset outputs of multiple fiber Bragg grating sensors located in the same area are obtained, and the multiple fiber Bragg grating sensors in the same area are in the same strain field and temperature field.

[0095] In this embodiment, such as Figure 5 As shown, the fiber Bragg grating sensors 2 in the composite material are arranged in multiple rows and columns, and the area where the multiple fiber Bragg grating sensors 2 are located can be divided into 9 position regions, each of which is shown in the dashed box. Adjacent position regions do not overlap. Multiple fiber Bragg grating sensors 2 are set in each position region, and the fiber Bragg grating sensors 2 in the same position region are in the same strain field and the same temperature field.

[0096] In other words, the following relationship is established based on the wavelength offset of any fiber Bragg grating sensor 2:

[0097] Δλ=K ε ·ε+K T ·ΔT;

[0098] Where Δλ is the wavelength shift of fiber Bragg grating sensor 2;

[0099] K ε Let be the strain sensitivity coefficient, and be a constant.

[0100] K T Here, is the temperature sensitivity coefficient, and is a constant.

[0101] ε is the strain of the composite material, which is an unknown quantity;

[0102] ΔT is the temperature change of the composite material, which is an unknown quantity.

[0103] The fact that fiber Bragg grating sensors 2 in the same location area are in the same strain field and the same temperature field can be understood as the fiber Bragg grating sensors 2 in the same location area satisfying the above relationship and having the same unknown parameters. Figure 5Taking the example of setting the same number of fiber Bragg grating sensors 2 in multiple location areas, in other embodiments, the number of fiber Bragg grating sensors 2 set in multiple location areas may be different or partially different.

[0104] In step 402, the strain of the basalt fiber mesh in the same location area is obtained based on multiple wavelength offsets, temperature sensitivity coefficients, and strain sensitivity coefficients.

[0105] In this embodiment, for each fiber Bragg grating sensor 2, the above-mentioned relationship can be established based on its own temperature sensitivity coefficient and strain sensitivity coefficient. Then, the strain of the basalt fiber mesh 1 in the location area can be solved by combining the equation, so as to separate the temperature change and the strain and understand the health status of the composite material.

[0106] For example, in some embodiments, the temperature sensitivity coefficients of multiple fiber Bragg grating sensors 2 located in the same area are partially different, and the strain null coefficients of the multiple fiber Bragg grating sensors 2 are partially different. Based on this, a linear equation can be established for each fiber Bragg grating sensor 2 in any area, relating wavelength offset, temperature sensitivity coefficient, strain sensitivity coefficient, strain, and temperature change. That is, the aforementioned relationship can be established. Furthermore, the strain in any area of ​​the basalt fiber mesh 1 can be solved jointly based on multiple linear equations.

[0107] For example, assuming that any location region has two fiber Bragg grating sensors 2, and that the strain sensitivity coefficients and temperature sensitivity coefficients of these two fiber Bragg grating sensors 2 are different, the following equation can be established:

[0108]

[0109] Based on this equation, the strain and temperature change in this location region can be obtained.

[0110] It is understood that when three or more fiber Bragg grating sensors 2 are set in any location area, multiple quadratic equations can be established to solve for the strain of that location area. Subsequently, the average of the multiple strains obtained can be used as the strain of that location area. In some other embodiments, the above-mentioned quadratic equations can also be established based on different temperature sensitivity coefficients and the same strain sensitivity coefficient, or they can be established based on different strain sensitivity coefficients and the same temperature sensitivity coefficient. This disclosure does not impose any limitations on this.

[0111] In other embodiments, a first fiber Bragg grating sensor and a second fiber Bragg grating sensor can be positioned in the same location area, wherein the first fiber Bragg grating sensor detects only the temperature change. Based on this, a linear equation can be established for each second fiber Bragg grating sensor, relating wavelength shift, temperature sensitivity coefficient, strain sensitivity coefficient, strain, and temperature change. Furthermore, using the temperature change detected by the first fiber Bragg grating sensor, the strain in any location area of ​​the basalt fiber mesh can be solved based on the linear equation and the temperature change detected by the first fiber Bragg grating sensor.

[0112] It is understandable that, based on the setup of multiple second fiber Bragg grating sensors, multiple strain variables can be calculated, and the health status of the composite material can then be evaluated by taking the average of these multiple strain variables.

[0113] In some other embodiments, at least one temperature sensor is provided in each location region. Subsequently, based on each fiber Bragg grating sensor in the location region, a linear equation is established between wavelength offset, temperature sensitivity coefficient, strain sensitivity coefficient, strain, and temperature change, where the strain and temperature change are unknowns. The temperature change is obtained based on the temperature sensor, and then the strain of the corresponding location region of the basalt fiber mesh 1 is solved according to the linear equation and the temperature change.

[0114] It is understandable that by setting up multiple fiber Bragg grating sensors in the same location area, multiple strain variables can be calculated, and the health status of the composite material can be evaluated by taking the average of these multiple strain variables.

[0115] In step 403, the health status of the composite material is determined based on the strain.

[0116] In this embodiment, the determination of whether the composite material is damaged can be based on the strain variable, thereby achieving health monitoring of the radiation material.

[0117] For example, in some embodiments, the strain variable can be compared with a baseline value. When the difference between the strain variable and the baseline value is greater than or equal to a set threshold, the health status of the composite material is determined to be damaged. Furthermore, the location of the damage in the composite material can be located based on the location area corresponding to the strain variable. In this way, the damage location can be accurately located, which is beneficial for subsequent treatment of the damage location, such as repair or removal.

[0118] In other embodiments, a two-dimensional strain image can be constructed based on the location parameters and strain of multiple location regions. Based on this two-dimensional strain image, the health condition of the composite material can be determined, and when the health condition of the composite material is determined to be damaged, the damage location can be located based on the two-dimensional strain image. For example, taking a rectangular composite material as an example, the horizontal and vertical coordinates of the two-dimensional strain image represent the length and width dimensions of the rectangle, and the strain value is represented by grayscale, thus creating the two-dimensional strain image.

[0119] In this two-dimensional strain image, the strain changes in each location region can be understood based on the global situation, thereby determining the strain of the location region in the healthy state. When the strain of any location region is greater than the strain of the location region in the healthy state, that location region can be determined to be in a damaged state. Furthermore, when the health status of any location region of the composite material is determined to be in a damaged state, the damage location can be located based on the two-dimensional strain image.

[0120] In the above embodiments, the location region where the health condition is damaged can also be obtained. Based on this location region where the health condition is damaged, the spacing between adjacent fiber Bragg grating sensors in the radial direction of the composite fiber, the number of fiber Bragg grating sensors 2, and the damage length of the composite material in the radial direction of the fiber can be obtained. For example,

[0121] L damage =(N damage -1)·Δ x

[0122] Among them, L damage The length of the damage;

[0123] N damage The number of fiber Bragg grating sensors 2 in the radial direction of the fiber is based on the location region in the damaged state.

[0124] Δ x The spacing is the distance between the fiber Bragg grating sensors 2 when they are equidistantly arranged in the radial direction of the fiber.

[0125] Similarly, based on the location region where the health condition is damaged, the spacing between adjacent fiber Bragg grating sensors in the direction perpendicular to the fiber radial direction of the composite material, the number of fiber Bragg grating sensors 2, and the damage length of the composite material in the direction perpendicular to the fiber radial direction can be obtained.

[0126] In some embodiments, when the health status of the composite material is determined to be in a damaged state based on the strain variable, the method can also locate the damage type of the location area corresponding to the strain variable based on the change characteristics of the strain variable within a set time period. Alternatively, the damage types of multiple location areas corresponding to multiple strain variables can be located through the change characteristics of multiple strain variables, thereby facilitating designers to repair or adjust the composite material according to the strain type.

[0127] For example, when the strain change characteristic is a large change in strain in a single location area, and no further strain change can be detected, the damage type of the corresponding location area can be determined as fiber fracture, and the reinforcement capacity of the composite material can be determined accordingly. As another example, when the strain change characteristic is strain weakening in multiple locations, i.e., abrupt changes in strain occur in multiple adjacent locations, the damage type of these multiple locations can be determined as fiber micro-delamination, i.e., debonding of the composite material, requiring immediate attention to the composite material type. As yet another example, when the strain change characteristic is a fluctuating strain change, the damage type of the corresponding location area can be determined as fiber micro-cracks; this fluctuating change can be understood as a vibration-like change in strain. As yet another example, when the strain change characteristic is a decreasing amount of strain change, and the strain change gradually slows down, the damage type of the corresponding location area can be determined as uneven colloid distribution, and designers need to consider the reliability of the composite material.

[0128] Corresponding to the aforementioned embodiments of the composite material health status detection method, this disclosure also provides embodiments of a composite material health status detection device.

[0129] Figure 6 This is a block diagram illustrating a health status detection device for a composite material according to an exemplary embodiment. The health status detection device is applied to the composite material described in any of the foregoing embodiments. The area where the plurality of fiber Bragg grating sensors are located is divided into multiple location regions, each location region having at least two fiber Bragg grating sensors, and adjacent location regions do not overlap. (Refer to...) Figure 6 The device includes a first acquisition module 61, a second acquisition module 62, and a determination module 63, wherein:

[0130] The first acquisition module 61 acquires the wavelength offset output by multiple fiber Bragg grating sensors set in the same location area, wherein the multiple fiber Bragg grating sensors in the same location area are in the same strain field and temperature field.

[0131] The second acquisition module 62 acquires the strain of the basalt fiber mesh in the same location area based on multiple wavelength offsets, temperature sensitivity coefficients, and strain sensitivity coefficients.

[0132] The determination module 63 determines the health status of the composite material based on the strain variable.

[0133] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0134] For the device embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to in the description of the method embodiments. The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this disclosure according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0135] Accordingly, this disclosure also provides a health status detection device applied to the composite material described in any of the foregoing embodiments. The area where the plurality of fiber Bragg grating sensors are located is divided into multiple location regions, each location region having at least two fiber Bragg grating sensors, and adjacent location regions do not overlap. The health status detection device includes: a processor, a fiber Bragg grating demodulator, and a memory for storing processor-executable instructions; wherein the processor is configured to: acquire the wavelength offset output by the plurality of fiber Bragg grating sensors located in the same location region, wherein the plurality of fiber Bragg grating sensors in the same location region are in the same strain field and temperature field; acquire the strain of the basalt fiber mesh in the same location region based on the plurality of wavelength offsets, temperature sensitivity coefficient, and strain sensitivity coefficient; and determine the health status of the composite material based on the strain.

[0136] Accordingly, this disclosure also provides a terminal, the terminal including a memory and one or more programs, wherein one or more programs are stored in the memory and configured to be executed by one or more processors. The one or more programs include instructions for performing the following operations: acquiring wavelength offsets output by multiple fiber Bragg grating sensors located in the same area, wherein the multiple fiber Bragg grating sensors in the same area are in the same strain field and temperature field; acquiring the strain of the basalt fiber mesh in the same area based on the multiple wavelength offsets, temperature sensitivity coefficients, and strain sensitivity coefficients; and determining the health status of the composite material based on the strain.

[0137] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory including instructions that can be executed by the processor of the health status monitoring device to perform the above-described method. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0138] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0139] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A composite material, characterized in that, include: Basalt fiber mesh; Multiple fiber Bragg grating sensors are embedded in the basalt fiber mesh. The multiple fiber Bragg grating sensors are arranged in a single column or multiple columns, and the column direction is parallel to the radial direction of the fibers of the basalt fiber mesh. The multiple fiber Bragg grating sensors are used to detect the health status of the basalt fiber mesh.

2. The composite material according to claim 1, characterized in that, In the column direction, multiple fiber Bragg grating sensors are arranged at equal intervals.

3. The composite material according to claim 1, characterized in that, Multiple fiber Bragg grating sensors are arranged in a multi-row, multi-column array.

4. A method for preparing a composite material, characterized in that, The method of preparing the composite material as described in any one of claims 1 to 3 comprises: Fiber Bragg grating sensors are embedded in uncured basalt fiber mesh; The composite material is obtained by curing an uncured basalt fiber mesh embedded with the fiber Bragg grating sensor.

5. The preparation method according to claim 4, characterized in that, The uncured basalt fiber mesh is cured to obtain the composite material, which includes: An uncured basalt fiber mesh embedded with the fiber Bragg grating sensor is immersed in a styrene-acrylic emulsion; Vacuum-assisted forming process is used to eliminate air bubbles; The composite material is cured in a constant temperature chamber for a preset time to form a three-dimensional mesh.

6. The preparation method according to claim 4, characterized in that, Also includes: A polyurethane protective layer is coated on the surface of the cured composite material.

7. A method for detecting the health status of composite materials, characterized in that, In the composite material applied as described in any one of claims 1-3, the area where the plurality of fiber Bragg grating sensors are located is divided into a plurality of location regions, each location region is provided with at least two fiber Bragg grating sensors, and adjacent location regions do not have overlapping areas. The health status detection method includes: The wavelength offset output by multiple fiber Bragg grating sensors set in the same location area is obtained, and the multiple fiber Bragg grating sensors in the same location area are in the same strain field and temperature field. The strain of the basalt fiber mesh in the same location region is obtained based on multiple wavelength offsets, temperature sensitivity coefficients, and strain sensitivity coefficients. The health status of the composite material is determined based on the strain.

8. The health status detection method according to claim 7, characterized in that, The temperature sensitivity coefficients and / or strain sensitivity coefficients of multiple fiber Bragg grating sensors located in the same area are at least partially different; The method of obtaining the strain of the basalt fiber mesh in the same location region based on multiple wavelength offsets, temperature sensitivity coefficients, and strain sensitivity coefficients includes: For each fiber Bragg grating sensor in any location region, establish a linear equation between wavelength offset, temperature sensitivity coefficient, strain sensitivity coefficient, strain, and temperature change, where strain and temperature change are unknowns. The strain of the corresponding region of the basalt fiber mesh is solved by combining multiple linear equations.

9. The health status detection method according to claim 7, characterized in that, In the first and second fiber Bragg grating sensors located in the same area, the first fiber Bragg grating sensor only detects the amount of temperature change. The method of obtaining the strain of the basalt fiber mesh in the same location region based on multiple wavelength offsets, temperature sensitivity coefficients, and strain sensitivity coefficients includes: For each second fiber Bragg grating sensor in any location region, a linear equation is established between wavelength offset, temperature sensitivity coefficient, strain sensitivity coefficient, strain, and temperature change, where strain and temperature change are unknowns. Obtain the temperature change detected by the first fiber Bragg grating sensor; Based on the temperature change and the linear equation, the strain of the corresponding region of the basalt fiber mesh is solved.

10. The health status detection method according to claim 7, characterized in that, At least one temperature sensor is provided in each of the aforementioned location areas; The method of obtaining the strain of the basalt fiber mesh in the same location region based on multiple wavelength offsets, temperature sensitivity coefficients, and strain sensitivity coefficients includes: For each fiber Bragg grating sensor based on the location region, a linear equation is established between wavelength offset, temperature sensitivity coefficient, strain sensitivity coefficient, strain, and temperature change, where strain and temperature change are unknowns. The temperature change is obtained based on the temperature sensor. Based on the temperature change and the linear equation, the strain of the corresponding region of the basalt fiber mesh is solved.

11. The health status detection method according to claim 7, characterized in that, The determination of the health status of the composite material based on the strain variable includes: Compare the dependent variable with the baseline value; When the difference between the dependent variable and the baseline value is greater than or equal to a set threshold, the health condition of the composite material is determined to be damaged. The damage location of the composite material is located based on the location region corresponding to the strain.

12. The health status detection method according to claim 7, characterized in that, The determination of the health status of the composite material based on the strain variable includes: A two-dimensional strain image between the strain and the location parameters is constructed based on the location parameters and strain in multiple location regions. Based on the two-dimensional strain image, the health status of the composite material is determined; When the health condition of the composite material is determined to be damaged, the damage location is located based on the two-dimensional strain image.

13. The health status detection method according to claim 7, characterized in that, Also includes: Acquire the location region where the health status is damaged; Based on the location region in the damaged state, the damage length of the composite material in the radial direction of the fiber is obtained according to the spacing between adjacent fiber Bragg grating sensors in the radial direction of the composite material fiber and the number of fiber Bragg grating sensors; and / or, the damage length of the composite material in the direction perpendicular to the radial direction of the fiber is obtained according to the spacing between adjacent fiber Bragg grating sensors in the direction perpendicular to the radial direction of the composite material fiber and the number of fiber Bragg grating sensors.

14. The health status detection method according to claim 7, characterized in that, Also includes: When the health status of the composite material is determined to be damaged based on the strain variable, the damage type of the location area corresponding to the strain variable is located based on the change characteristics of the strain variable within a set time period.

15. The health status detection method according to claim 14, characterized in that, The damage type for locating the location region corresponding to the strain variable based on the change characteristics of the strain variable within a set time period includes at least one of the following: When the strain change characteristic is a drastic change in strain in a single location area, and no further strain change can be detected, the damage type of the location area corresponding to the strain is determined to be fiber breakage. The strain variation characteristics are multi-location region strain weakening, and the damage type of the multi-location region is determined to be fiber delamination; The strain variation characteristic is a jittery strain variation, and the damage type of the location area corresponding to the strain is determined to be fiber microcracks. The characteristic of the strain change is a decrease in the rate of change of the strain, and the damage type of the location area corresponding to the strain is determined to be uneven colloid distribution.

16. A health status detection device for composite materials, characterized in that, In the composite material applied as described in any one of claims 1-3, the area where the plurality of fiber Bragg grating sensors are located is divided into a plurality of location regions, each location region is provided with at least two fiber Bragg grating sensors, and adjacent location regions do not have overlapping areas. The health status detection device includes: The first acquisition module acquires the wavelength offset output by multiple fiber Bragg grating sensors set in the same location area, wherein the multiple fiber Bragg grating sensors in the same location area are in the same strain field and temperature field. The second acquisition module acquires the strain of the basalt fiber mesh in the same location area based on multiple wavelength offsets, temperature sensitivity coefficients, and strain sensitivity coefficients. The determination module determines the health status of the composite material based on the strain variable.

17. A computer-readable storage medium storing computer instructions thereon, characterized in that, When executed by the processor, this instruction implements the steps of the method as described in any one of claims 7-15.

18. An electronic device, characterized in that, include: processor; A fiber Bragg grating demodulator, wherein the fiber Bragg grating demodulator is electrically connected to a fiber Bragg grating sensor of any composite material according to any one of claims 1-3, and the fiber Bragg grating demodulator is electrically connected to the processor; Memory used to store processor-executable instructions; The processor is configured to implement the steps of any one of the methods in claims 7-15 when executing.

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