In-situ fiber extraction method and system for si c / si c composite material preform
Patent Information
- Application Number
- CN202311110726.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-08-31
- Publication Date
- 2026-09-18
- Estimated Expiration
- 2043-08-31
AI Technical Summary
但这些方法均是针对原始纤维开展强度测试，无法获取编织复合材料原位纤维性能
[0042] This invention provides a method and system for in-situ fiber extraction from SiC/SiC composite preforms. The method includes: dividing the braided SiC/SiC composite preform into sub-regions based on fiber damage patterns; determining the boundary positions of each sub-region based on the bending degree and thickness variation of each type of yarn; marking the sub-region boundaries of each type of yarn; extracting multiple fiber bundles with a length greater than the test gauge length from the braided SiC/SiC composite preform; and extracting fibers from different sub-regions based on the marked sub-region boundaries of each type of yarn and the multiple fiber bundles. This invention enables the acquisition of in-situ regional fiber properties of composite materials, providing an effective method for obtaining material parameters for composite mechanical property methods that consider in-situ fiber properties.
Smart Images
Figure CN117288575B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of performance testing technology for braided composite materials, and particularly relates to a method and system for in-situ fiber extraction from SiC / SiC composite preforms. Background Technology
[0002] SiC / SiC composites are considered important materials for high-temperature components in aero-engines due to their high-temperature performance and low density. The tensile strength of this composite is significantly affected by the tensile strength of its individual filaments. Studying the tensile strength of SiC fibers is crucial for the application of SiC / SiC composites. Similar to most brittle materials, fibers contain randomly distributed defects, leading to randomness in fiber strength. Therefore, obtaining the strength distribution of individual filaments in SiC / SiC composites is key to conducting micromechanical analysis of the composite.
[0003] Currently, researchers both domestically and internationally primarily employ methods based on monofilament tensile strength testing (ISO 19630 standard) and composite tow fiber tensile strength testing (ISO 22459 standard) to obtain the strength distribution of fibers in the original fiber bundle (Yoshito Ik et al., Direct comparison between monofilament and multifilament tow testing for evaluating the tensile strength distribution of SiC fibers, Journal of the European Ceramic Society, 2022). Other researchers have used monofilament tensile testing to obtain the strength distribution of fibers after high-temperature heat treatment (Sheng Z., Prediction of strength and constitutive response of SiC / SiC composites considering fiber failure, Composites Part B, 2019). However, these methods all target the strength of the original fibers and cannot obtain the in-situ fiber properties of the woven composite material. Friction between fibers and between fibers and tools during the preform weaving process causes significant regional differences in the in-situ fiber strength of the woven composite material, necessitating the extraction and strength testing of in-situ fibers from different regions.
[0004] Therefore, there is an urgent need for an in-situ fiber extraction method for woven composite preforms to extract in-situ fibers from different regions inside the woven composite material in order to obtain the in-situ fiber strength distribution of the woven composite material. Summary of the Invention
[0005] This invention addresses the shortcomings of existing technologies by providing a method and system for in-situ fiber extraction from SiC / SiC composite preforms.
[0006] In a first aspect, the present invention provides a method for in-situ fiber extraction from SiC / SiC composite preforms, comprising:
[0007] Based on the fiber damage mode, different types of yarns in the braided SiC / SiC composite preform are divided into sub-regions;
[0008] The boundary positions of each sub-region are determined based on the degree of bending and thickness variation of each type of yarn.
[0009] Mark the boundaries of sub-regions for each type of yarn;
[0010] Multiple fiber bundles with a length greater than the test gauge length were extracted from the braided SiC / SiC composite preform;
[0011] Separate the fiber bundles according to the sub-region boundaries of the marked yarn types to extract fibers from different sub-regions.
[0012] Furthermore, the sub-regional division of different types of yarns within the braided SiC / SiC composite preform based on fiber damage patterns includes:
[0013] The bonding yarn is divided into a first transverse outer sub-region, a first longitudinal outer sub-region, and a first inner sub-region along the cross section; wherein the bonding yarn is subjected to friction from the outer warp yarn at the longitudinal boundary and to friction from the outer weft yarn at the transverse boundary.
[0014] The warp yarns are divided into a second transverse outer sub-region and a second inner sub-region; wherein the warp yarns are subjected to lateral friction from the knotting yarns;
[0015] The weft yarn is divided into a second longitudinal outer sub-region and a third inner sub-region; in which the weft yarn is subjected to longitudinal friction from the knotting yarn.
[0016] Furthermore, the marking of sub-region boundaries for each type of yarn includes:
[0017] A steel needle soaked in ink is aligned with a pre-marked point and inserted into the target type of yarn along the fiber direction. The pre-marked point is the boundary separation insertion point determined based on the degree of yarn curvature and the degree of yarn size variation.
[0018] Pull the steel needle out of the target type yarn, leaving an uninked area in the middle of the needle insertion position as the boundary of the sub-region of the target type yarn.
[0019] Further, the step of separating each fiber bundle according to the sub-region boundaries of the marked yarn types to extract fibers from different sub-regions includes:
[0020] Insert a steel needle into the target type yarn at the solidified section of the target type yarn, along the boundary of the marked sub-region;
[0021] Cut the sub-region fiber bundles that have been peeled off with steel needles;
[0022] Fibers are extracted from the fiber bundles in the sub-region to obtain the sub-region fibers.
[0023] Secondly, the present invention provides an in-situ fiber extraction system for SiC / SiC composite preforms, comprising:
[0024] The sub-region division module is used to divide different types of yarns in the braided SiC / SiC composite preform into sub-regions based on the fiber damage mode.
[0025] The sub-region boundary determination module is used to determine the boundary position of each sub-region based on the degree of curvature and thickness variation of each type of yarn.
[0026] The sub-region boundary marking module is used to mark the sub-region boundaries of various types of yarn;
[0027] The fiber bundle extraction module is used to extract multiple fiber bundles with a length greater than the test gauge length from a braided SiC / SiC composite preform.
[0028] The sub-region fiber extraction module is used to separate fiber bundles according to the marked sub-region boundaries of various types of yarn in order to extract fibers from different sub-regions.
[0029] Furthermore, the sub-region division module includes:
[0030] The first dividing unit is used to divide the bonding yarn along the cross section into a first transverse outer sub-region, a first longitudinal outer sub-region, and a first inner sub-region; wherein the bonding yarn is subjected to friction from the outer warp yarn at the longitudinal boundary and to friction from the outer weft yarn at the transverse boundary.
[0031] The second dividing unit is used to divide the warp yarn into a second transverse outer sub-region and a second inner sub-region; wherein the warp yarn is subjected to lateral friction from the knotting yarn;
[0032] The third dividing unit is used to divide the weft yarn into a second longitudinal outer sub-region and a third inner sub-region; wherein the weft yarn is subjected to longitudinal friction from the knotting yarn.
[0033] Furthermore, the sub-region boundary marking module includes:
[0034] The first steel needle insertion unit is used to insert a steel needle soaked in ink into the target type yarn along the fiber direction, with the pre-marked point being a boundary separation insertion point determined based on the yarn's curvature and size variation.
[0035] The steel needle extraction unit is used to extract the steel needle from the target type yarn, leaving an un-inked area in the middle of the steel needle insertion position as the boundary of the sub-region of the target type yarn.
[0036] Furthermore, the sub-region fiber extraction module includes:
[0037] The second steel needle insertion unit is used to insert a steel needle into the target type yarn at the solidified section of the target type yarn along the boundary of the marked sub-region;
[0038] Fiber bundle cutting unit, used to cut sub-region fiber bundles stripped by steel needles;
[0039] The fiber extraction unit is used to extract fibers from the fiber bundles in the sub-region to obtain the fibers in the sub-region.
[0040] Thirdly, the present invention provides a computer device including a processor and a memory; wherein, when the processor executes a computer program stored in the memory, it implements the steps of the in-situ fiber extraction method for SiC / SiC composite preforms described in the first aspect.
[0041] Fourthly, the present invention provides a computer-readable storage medium for storing a computer program; when the computer program is executed by a processor, it implements the steps of the in-situ fiber extraction method for SiC / SiC composite preforms described in the first aspect.
[0042] This invention provides a method and system for in-situ fiber extraction from SiC / SiC composite preforms. The method includes: dividing the braided SiC / SiC composite preform into sub-regions based on fiber damage patterns; determining the boundary positions of each sub-region based on the bending degree and thickness variation of each type of yarn; marking the sub-region boundaries of each type of yarn; extracting multiple fiber bundles with a length greater than the test gauge length from the braided SiC / SiC composite preform; and extracting fibers from different sub-regions based on the marked sub-region boundaries of each type of yarn and the multiple fiber bundles. This invention enables the acquisition of in-situ regional fiber properties of composite materials, providing an effective method for obtaining material parameters for composite mechanical property methods that consider in-situ fiber properties. Attached Figure Description
[0043] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0044] Figure 1 The three-dimensional orthogonal SiC preform provided in the embodiments of the present invention;
[0045] Figure 2 This is a schematic diagram illustrating the regional division of various types of yarns in a three-dimensional orthogonal SiC preform provided in an embodiment of the present invention;
[0046] Figure 3 This is a schematic diagram of a three-dimensional orthogonal SiC region boundary marking method provided in an embodiment of the present invention;
[0047] Figure 4 This is a schematic diagram of the monofilament stretching liner structure provided in an embodiment of the present invention;
[0048] Figure 5 The ln[-ln(1-p)]-lnσ diagram of fiber strength distribution in each sub-region provided in the embodiments of the present invention;
[0049] Figure 6 A flowchart illustrating an in-situ fiber extraction method for SiC / SiC composite preforms provided in this embodiment of the invention;
[0050] Figure 7 This is a schematic diagram of the structure of an in-situ fiber extraction system for SiC / SiC composite preforms provided in an embodiment of the present invention. Detailed Implementation
[0051] 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0052] like Figure 1 As shown, the embodiment of the present invention takes a three-dimensional orthogonal SiC preform as an example.
[0053] In one embodiment, such as Figure 6 As shown, this embodiment of the invention provides a method for in-situ fiber extraction from SiC / SiC composite preforms, comprising:
[0054] Step 101: Based on the fiber damage mode, divide the different types of yarns in the braided SiC / SiC composite preform into sub-regions.
[0055] like Figure 2 As shown in Figure 2(a), the bonding yarn is subjected to friction from the outer warp yarn at the longitudinal boundary and from the outer weft yarn at the transverse boundary. Therefore, the bonding yarn is divided into three sub-regions along the cross-section as shown in Figure 2(a): the first transverse outer sub-region a), the first longitudinal outer sub-region b), and the first inner sub-region c).
[0056] like Figure 2 As shown in (a), the warp yarn is mainly subjected to lateral friction from the knotting yarn, thus dividing the warp yarn into a second transverse outer sub-region (d) and a second inner sub-region (e).
[0057] like Figure 2 As shown in (a), the weft yarn is mainly subjected to longitudinal friction from the knotting yarn, thus dividing the weft yarn into a second longitudinal outer sub-region (f) and a third inner sub-region (g).
[0058] Step 102: Determine the boundary position of each sub-region based on the degree of bending and thickness variation of each type of yarn.
[0059] During the weaving process, the lateral compression of the outer warp yarns reduces the width of the yarn segment entering the preform. Therefore, the width variation of the knotting yarn is used as the basis for dividing the first lateral outer sub-region a), i.e., selecting... Figure 2 Point A in (b) is used as the target point for region division.
[0060] like Figure 2 As shown in (b) and (c), during the weaving process, the interlacing of the bonding yarn and the weft yarn causes the outermost segment of the bonding yarn to have a flat and smooth geometry. The thickness of the bonding yarn varies significantly along its extension direction. However, since most of the bonding yarn segment is inside the preform, the variation in yarn thickness cannot be used as a basis for region division. Therefore, in this embodiment of the invention, the longitudinal outer region of the bonding yarn, which accounts for one-quarter of the thickness, is designated as the first longitudinal outer sub-region (b).
[0061] Once the first horizontal outer subregion a) and the first vertical outer subregion b) are determined, the first internal subregion c) can be determined.
[0062] like Figure 2 As shown in (b) and (c), due to the lateral compression of the knotting yarn, the warp yarns experience lateral bending and local compression. The local deflection and compression degree of the warp yarns are used as the basis for dividing the second lateral outer sub-region d), therefore, [the region is selected]. Figure 2 Point B in (b) is used as the target point for dividing the second horizontal outer sub-region d).
[0063] Once the second horizontal outer subregion d) is determined, the second internal subregion e) can be determined.
[0064] like Figure 2 As shown in (e), the interlacing of the knotted yarns causes localized pressure on the weft yarn. The thickness change caused by this localized pressure on the weft yarn is used as the basis for dividing the second longitudinal outer sub-region (f). Figure 2 As shown in (e), point C is selected as the target point for dividing the third internal sub-region (f).
[0065] Step 103: Mark the boundaries of sub-regions for each type of yarn.
[0066] This step uses the first transverse outer sub-region a) of the yarn splicing as an example to illustrate the implementation scheme of sub-region boundary marking.
[0067] like Figure 3 As shown in (b), a 0.1 mm steel needle is dipped in white ink.
[0068] like Figure 3 As shown in (b), a steel needle dipped in white ink is inserted into the splicing yarn along the fiber direction, with the pre-marked point being the boundary separation insertion point determined based on the degree of yarn curvature and the degree of yarn size variation.
[0069] like Figure 3 As shown in (c), when the steel needle is pulled out of the target yarn, ink will remain on both sides of the insertion position of the steel needle, leaving an area in the middle that is not stained with ink. The area in the middle that is not stained with ink is used as the boundary of the first horizontal outer sub-region a).
[0070] The same method is used to mark the boundaries of other sub-regions, which will not be elaborated here.
[0071] Step 104: Extract multiple fiber bundles with a length greater than the test gauge length from the braided SiC / SiC composite preform.
[0072] To prevent fiber loosening from affecting the accuracy of subsequent sub-region fiber separation, epoxy resin was used to... Figure 2 The bi-1, wa-1 and we-1 sections shown in (a) are cured.
[0073] Cut off the remaining yarn around the target yarn segment and remove the target yarn segment.
[0074] Step 105: Separate each fiber bundle according to the marked sub-region boundaries of each type of yarn to extract fibers from different sub-regions.
[0075] For example, a 0.1 mm steel needle is inserted into the yarn at the cured section of the target yarn along the boundary of the marked sub-region.
[0076] Use fiber shears to cut the sub-region fiber bundles that have been peeled off with steel needles.
[0077] Fibers are extracted from the fiber bundles in the sub-region to obtain the sub-region fibers.
[0078] In this step, the obtained sub-region fibers are used as samples, and the samples are adhered to such a substrate. Figure 4 The sample was placed on a substrate. Single-filament strength tests were performed on the fibers in each sub-region to determine the strength distribution of each sub-region. The probability value p corresponding to each strength value σ was calculated using the median rank method, and a linear fitting image between ln[-ln(1-p)] and lnσ was obtained using the two-parameter Weibull distribution method as an example. Figure 5 In the middle, (a), (b), and (c) are linear fitting diagrams of the fiber strength distribution in each sub-region of the knotted yarn, warp yarn, and weft yarn, respectively. Figure 5 In the middle (d), the linear fitting diagram of the fiber strength distribution in the complete region of the three yarns is shown.
[0079] This invention can obtain the in-situ regional fiber properties of composite materials, providing an effective method for obtaining material parameters for composite material mechanical property methods that consider the in-situ properties of fibers.
[0080] Based on the same inventive concept, this invention also provides an in-situ fiber extraction system for SiC / SiC composite preforms. Since the principle of this system in solving the problem is similar to the aforementioned in-situ fiber extraction method for SiC / SiC composite preforms, the implementation of this system can refer to the implementation of the in-situ fiber extraction method for SiC / SiC composite preforms, and the repeated parts will not be described again.
[0081] In another embodiment, the in-situ fiber extraction system for SiC / SiC composite preforms provided in this invention, such as... Figure 7 As shown, it includes:
[0082] The sub-region division module 10 is used to divide different types of yarns in the braided SiC / SiC composite preform into sub-regions according to the fiber damage mode.
[0083] The sub-region boundary determination module 20 is used to determine the boundary position of each sub-region based on the degree of curvature and thickness variation of each type of yarn.
[0084] The sub-region boundary marking module 30 is used to mark the sub-region boundaries of various types of yarn.
[0085] The fiber bundle extraction module 40 is used to extract multiple fiber bundles with a length greater than the test gauge length from the braided SiC / SiC composite preform.
[0086] The sub-region fiber extraction module 50 is used to separate each fiber bundle according to the marked sub-region boundaries of each type of yarn in order to extract fibers from different sub-regions.
[0087] For example, the sub-region division module includes:
[0088] The first dividing unit is used to divide the bonding yarn along the cross section into a first transverse outer sub-region, a first longitudinal outer sub-region, and a first inner sub-region; wherein the bonding yarn is subjected to friction from the outer warp yarn at the longitudinal boundary and to friction from the outer weft yarn at the transverse boundary.
[0089] The second dividing unit is used to divide the warp yarn into a second transverse outer sub-region and a second inner sub-region; wherein the warp yarn is subjected to lateral friction from the knotting yarn;
[0090] The third dividing unit is used to divide the weft yarn into a second longitudinal outer sub-region and a third inner sub-region; wherein the weft yarn is subjected to longitudinal friction from the knotting yarn.
[0091] For example, the sub-region boundary marking module includes:
[0092] The first steel needle insertion unit is used to insert a steel needle soaked in ink into the target type yarn along the fiber direction, with the pre-marked point being a boundary separation insertion point determined based on the yarn's curvature and size variation.
[0093] The steel needle extraction unit is used to extract the steel needle from the target type yarn, leaving an un-inked area in the middle of the steel needle insertion position as the boundary of the sub-region of the target type yarn.
[0094] For example, the sub-region fiber extraction module includes:
[0095] The second steel needle insertion unit is used to insert a steel needle into the target type yarn at the solidified section of the target type yarn along the boundary of the marked sub-region;
[0096] Fiber bundle cutting unit, used to cut sub-region fiber bundles stripped by steel needles;
[0097] The fiber extraction unit is used to extract fibers from the fiber bundles in the sub-region to obtain the fibers in the sub-region.
[0098] For more detailed information on the working process of each of the above modules, please refer to the relevant content disclosed in the foregoing embodiments, which will not be repeated here.
[0099] In another embodiment, the present invention provides a computer device including a processor and a memory; wherein the processor executes a computer program stored in the memory to implement the steps of the above-described in-situ fiber extraction method for SiC / SiC composite preforms.
[0100] For a more detailed explanation of the above method, please refer to the relevant content disclosed in the foregoing embodiments, which will not be repeated here.
[0101] In another embodiment, the present invention provides a computer-readable storage medium for storing a computer program; when the computer program is executed by a processor, it implements the steps of the above-described in-situ fiber extraction method for SiC / SiC composite preforms.
[0102] For a more detailed explanation of the above method, please refer to the relevant content disclosed in the foregoing embodiments, which will not be repeated here.
[0103] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The systems, devices, and storage media disclosed in the embodiments are described simply because they correspond to the methods disclosed in the embodiments; relevant details can be found in the method section.
[0104] Those skilled in the art will clearly understand that the techniques in the embodiments of the present invention can be implemented using software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solutions in the embodiments of the present invention, or the parts that contribute to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or certain parts of the embodiments of the present invention.
[0105] The present invention has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present invention. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and embodiments of the present invention without departing from the spirit and scope of the invention, and all such modifications and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.
Claims
1. A method for in-situ fiber extraction from SiC / SiC composite preforms, characterized in that, include: Based on the fiber damage mode, different types of yarns within the braided SiC / SiC composite preform are divided into sub-regions. Specifically, the bonding yarn is divided along the cross-section into a first transverse outer sub-region, a first longitudinal outer sub-region, and a first inner sub-region; wherein the bonding yarn is subjected to friction from the outer warp yarn at the longitudinal boundary and friction from the outer weft yarn at the transverse boundary; the warp yarn is divided into a second transverse outer sub-region and a second inner sub-region; wherein the warp yarn is subjected to lateral friction from the knotting yarn; the weft yarn is divided into a second longitudinal outer sub-region and a third inner sub-region; wherein the weft yarn is subjected to longitudinal friction from the knotting yarn. The boundary positions of each sub-region are determined based on the degree of bending and thickness variation of each type of yarn. Mark the boundaries of sub-regions for each type of yarn; Multiple fiber bundles with a length greater than the test gauge length were extracted from the braided SiC / SiC composite preform; Separate the fiber bundles according to the sub-region boundaries of the marked yarn types to extract fibers from different sub-regions.
2. The method for in-situ fiber extraction from SiC / SiC composite preforms according to claim 1, characterized in that, The marking of sub-region boundaries for each type of yarn includes: A steel needle soaked in ink is aligned with a pre-marked point and inserted into the target type of yarn along the fiber direction. The pre-marked point is the boundary separation insertion point determined based on the degree of yarn curvature and the degree of yarn size variation. Pull the steel needle out of the target type yarn, leaving an uninked area in the middle of the needle insertion position as the boundary of the sub-region of the target type yarn.
3. The method for in-situ fiber extraction from SiC / SiC composite preforms according to claim 1, characterized in that, The step of separating fiber bundles according to the sub-region boundaries of marked yarn types to extract fibers from different sub-regions includes: Insert a steel needle into the target type yarn at the solidified section of the target type yarn, along the boundary of the marked sub-region; Cut the sub-region fiber bundles that have been peeled off with steel needles; Fibers are extracted from the fiber bundles in the sub-region to obtain the sub-region fibers.
4. A system for in-situ fiber extraction from SiC / SiC composite preforms, characterized in that, include: The sub-region division module is used to divide different types of yarns in the braided SiC / SiC composite preform into sub-regions based on the fiber damage mode. The sub-region boundary determination module is used to determine the boundary position of each sub-region based on the degree of curvature and thickness variation of each type of yarn. The sub-region boundary marking module is used to mark the sub-region boundaries of various types of yarn; The fiber bundle extraction module is used to extract multiple fiber bundles with a length greater than the test gauge length from a braided SiC / SiC composite preform. The sub-region fiber extraction module is used to separate fiber bundles according to the marked sub-region boundaries of various types of yarn in order to extract fibers from different sub-regions. The sub-region division module includes: The first dividing unit is used to divide the bonding yarn along the cross section into a first transverse outer sub-region, a first longitudinal outer sub-region, and a first inner sub-region; wherein the bonding yarn is subjected to friction from the outer warp yarn at the longitudinal boundary and to friction from the outer weft yarn at the transverse boundary. The second dividing unit is used to divide the warp yarn into a second transverse outer sub-region and a second inner sub-region; wherein the warp yarn is subjected to lateral friction from the knotting yarn; The third dividing unit is used to divide the weft yarn into a second longitudinal outer sub-region and a third inner sub-region; wherein the weft yarn is subjected to longitudinal friction from the knotting yarn.
5. The in-situ fiber extraction system for SiC / SiC composite preforms according to claim 4, characterized in that, The sub-region boundary marking module includes: The first steel needle insertion unit is used to insert a steel needle soaked in ink into the target type yarn along the fiber direction, with the pre-marked point being a boundary separation insertion point determined based on the yarn's curvature and size variation. The steel needle extraction unit is used to extract the steel needle from the target type yarn, leaving an un-inked area in the middle of the steel needle insertion position as the boundary of the sub-region of the target type yarn.
6. The in-situ fiber extraction system for SiC / SiC composite preforms according to claim 4, characterized in that, The sub-region fiber extraction module includes: The second steel needle insertion unit is used to insert a steel needle into the target type yarn at the solidified section of the target type yarn along the boundary of the marked sub-region; Fiber bundle cutting unit, used to cut sub-region fiber bundles stripped by steel needles; The fiber extraction unit is used to extract fibers from the fiber bundles in the sub-region to obtain the fibers in the sub-region.
7. A computer device, characterized in that, It includes a processor and a memory; wherein, when the processor executes the computer program stored in the memory, it implements the steps of the in-situ fiber extraction method for SiC / SiC composite preforms as described in any one of claims 1-3.
8. A computer-readable storage medium, characterized in that, Used to store computer programs; when executed by a processor, the computer programs implement the steps of the in-situ fiber extraction method for SiC / SiC composite preforms as described in any one of claims 1-3.