A high-strength metal - SiC f / SiC Heteroclad Tube Structure and Design Method

Abstract

This invention discloses a high-strength metal-SiC f This invention relates to a SiC heterogeneous cladding tube structure and its design method. The heterogeneous cladding tube comprises a refractory metal liner and a multi-layered SiC fiber preform with braiding angles ranging from 0° to 45°. The design method includes: A. Establishing a geometric model of the multi-layered heterogeneous cladding tube; B. Meshing the geometric model into a solid mesh; C. Establishing a curvilinear coordinate system; D. Setting boundary conditions for the geometric model; E. Defining the mechanical damage criteria for each component of the geometric model; F. Calculating the stress-strain curves of the multi-layered heterogeneous cladding tube; G. Determining the structural design of the high-strength multi-layered heterogeneous cladding tube. The multi-layered heterogeneous cladding tube designed in this invention exhibits excellent axial and circumferential tensile strength. Furthermore, the use of the finite element method in the structural design reduces the time cycle from material design to application, thereby enabling rapid optimization of accident-tolerant fuel cladding structures.

Description

Technical Field

[0001] This invention relates to the field of nuclear fuel composite cladding tubes, specifically providing a high-strength metal-SiC... f / SiC heteroclad tube structure and its design method. Background Technology

[0002] Accident-Tolerant Fuel Cladding Material (ATFM) is used to clad nuclear fuel cores, which are highly radioactive. The primary function of the cladding tubes covering the fuel core is to protect it from coolant corrosion while preventing the escape of radioactive nuclear fission products. The harsh operating environment subjectes the cladding tubes to the dual pressures of internal nuclear fission gas products and external coolant, as well as intense radiation, corrosion, and thermal shock. Therefore, the cladding material must possess properties such as a small neutron absorption cross-section, high mechanical stability, dimensional stability under irradiation, inertness to fission products, resistance to water corrosion, and low creep rate. The selection, design, and reliability of this material are crucial for the advancement, economy, and safety of nuclear power.

[0003] SiC f SiC composite materials possess excellent high-temperature mechanical properties, as well as corrosion and radiation resistance, making them suitable for use in light water reactors. However, due to limitations in current fabrication processes, SiC... f The relatively high porosity (10%–15%) of SiC composites limits their further development in the nuclear energy field. Refractory metals, on the other hand, can achieve 100% density, particularly molybdenum, which exhibits similar properties to SiC. f The good high-temperature chemical compatibility and physical matching of SiC composite materials make metal-SiC f / SiC heterocladding tubes have become one of the candidate materials for next-generation accident-tolerant fuel cladding, but there is currently little research on their mechanical properties, especially how the structural design of heterocladding tubes affects their axial tensile strength and circumferential tensile strength, which remains an unsolved problem.

[0004] Therefore, the present invention aims to provide a high-strength metal-SiC f / SiC Heteroclad Tube Structure and Design Method: The designed heteroclad tube consists of an inner refractory metal and an outer SiC layer. f It is composed of SiC composite material, with an inner refractory metal layer having a thickness of 0.3–0.5 mm and an outer SiC layer. fThe SiC composite material consists of 3-5 layers of SiC fiber preforms, each with a weaving angle of 0°–45° and a thickness of 0.3 mm. The heterogeneous cladding tube with this structure exhibits an axial tensile strength of 225 MPa and a circumferential tensile strength of 183 MPa–190 MPa, demonstrating good axial and circumferential tensile strength. Furthermore, the stress-strain curves of heterogeneous cladding tubes with different two-dimensional fiber weaving angles were calculated using finite element analysis. The axial and circumferential tensile strengths of different heterogeneous cladding tubes were analyzed and compared, leading to the selection of a high-strength heterogeneous cladding tube structural design. The finite element method was used to study the metal-SiC composite material. f Structural design using SiC heterocladding tubes can reduce the cost of material development and testing, providing a practical and effective method for designing novel accident-tolerant fuel cladding. Summary of the Invention

[0005] The purpose of this invention is to provide a high-strength metal-SiC f / SiC heteroclad tube structure and its design method, aiming to improve metal-SiC f The axial tensile strength and circumferential tensile strength of SiC heteroclad tubes, shortening the metal-SiC... f / Design time for SiC heteroclad tubes.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A high-strength metal - SiC f / SiC heteroclad tube structure, including an inner metal liner and an outer SiC layer f / SiC composite material, with an inner metal lining of refractory metal and an outer SiC layer. f / SiC composite material is a SiC fiber preform consisting of 3 to 5 layers with the same weave angle. f and SiC fiber preform f The SiC matrix is ​​composed of SiC fibers in each preform layer, which are present in a two-dimensional braided manner, and the braiding angle is in the range of 0° to 45°. The braiding angle is the angle between the axis of the SiC fiber and the axis of the heterogeneous cladding tube.

[0008] Furthermore, the refractory metal is one of rhenium, zirconium, molybdenum, tantalum, and niobium.

[0009] Furthermore, the thickness of the refractory metal is 0.3 mm to 0.4 mm, SiC fThe thickness of the SiC composite material is 0.9mm to 1.5mm, the volume fraction of SiC fiber is not less than 30%, the inner diameter of the heterogeneous cladding tube is 10.0mm to 11.0mm, the axial tensile strength of the heterogeneous cladding tube is not less than 200MPa, and the circumferential tensile strength is 183MPa to 190MPa.

[0010] This invention also provides a high-strength metal-SiC f The design method for SiC heteroclad tube structures includes the following steps:

[0011] A. Establishing a geometric model of a multi-layer heterogeneous cladding tube: Based on images obtained from a scanning electron microscope, the geometric dimensions of SiC fibers, SiC matrix, and metal liner are recorded. Three sets of single-layer prefabricated models with different weaving angles are constructed in COMSOL Multiphysics software. The weaving angle of each single-layer prefabricated model is 0° to 45°. The overlap and gaps in the single-layer prefabricated models are removed by modifying the relative tolerance value of the single-layer prefabricated models. Then, the single-layer prefabricated models are combined into a geometric model of a multi-layer heterogeneous cladding tube.

[0012] B. Solid mesh generation of the multilayer heterogeneous cladding tube geometric model: Based on the multilayer heterogeneous cladding tube geometric model established in step a, tetrahedral mesh generation is performed on each component of the model, namely SiC matrix, SiC fiber, and metal liner.

[0013] C. Establishing a curvilinear coordinate system: The three basis vectors of SiC fibers are defined by solving the Laplace equation, and the three basis vectors of the SiC matrix and the metal liner are defined by vector operations, thus completing the establishment of a curvilinear coordinate system for the SiC matrix, SiC fibers, and metal liner.

[0014] D. Set boundary conditions for the geometric model of the multilayer heterogeneous cladding tube: Set an increasing displacement sequence on a specified surface of the geometric model of the multilayer heterogeneous cladding tube to simulate the process of the heterogeneous cladding tube being subjected to axial tension and radial compression.

[0015] E. Define the mechanical damage criteria for each component of the geometric model of the multilayer heterogeneous cladding tube: the Hashin criterion is adopted for SiC fibers, the first strength theory criterion is adopted for SiC matrix, and the fourth strength theory criterion is adopted for metal liner, thus completing the establishment of the finite element model of the multilayer heterogeneous cladding tube.

[0016] F. Calculate the stress-strain curves of the multilayer heterogeneous clad tube: Based on the finite element model of the multilayer heterogeneous clad tube established in step e, select the Newton iteration method to solve the stress-strain curves of the heterogeneous clad tube, and complete the plotting of the axial stress-strain curves and circumferential stress-strain curves of the heterogeneous clad tube.

[0017] G. Determine the structural design of the high-strength multilayer heterogeneous cladding tube: Based on the two stress-strain curves calculated in step f, find the stress value corresponding to the highest point of the two stress-strain curves. This stress value is the axial tensile strength and circumferential tensile strength of the multilayer heterogeneous cladding tube. The model structure corresponding to this axial tensile strength and circumferential tensile strength is the designed high-strength heterogeneous cladding tube structure.

[0018] Further, the geometric dimensional information includes the thicknesses of the SiC matrix, SiC fibers, and metal liner, which are 0.30–0.40 mm, 0.21–0.27 mm, and 0.9–1.0 mm, respectively; the heterogeneous cladding tube has a height of 31.45 mm, an inner diameter of 10.0–11.0 mm, and an outer diameter of 13.0–15.0 mm. The weaving path of the SiC fibers is controlled by two parametric equations, which are:

[0019]

[0020]

[0021] In the formula, R is the radius of the braided tube (mm); T is the thickness of the fiber braid (mm); w is the braiding angular velocity (rad / s); t is the time (s); and v is the braiding linear velocity (mm / s).

[0022] Furthermore, the aforementioned multi-layer heterogeneous cladding tube geometric model is formed by combining single-layer prefabricated models with the same braiding angle according to their inner diameter and arranged from the inner layer to the outer layer.

[0023] Furthermore, the three basis vectors of the SiC fiber are:

[0024]

[0025] In the formula, e1, e2, and e3 are the first, second, and third basis vectors of the SiC fiber, respectively; u2 is the basis vector of the z-axis in the Cartesian coordinate system.

[0026] u is a vector field. It is the Hamiltonian operator, t is the harmonic function, and i and j are the unit basis vectors of the x-axis and y-axis in the Cartesian coordinate system, respectively.

[0027] Furthermore, the three basis vectors of the SiC matrix and the metal liner are:

[0028]

[0029] v Z =v z

[0030]

[0031] In the formula, v x v y v z These are the first, second, and third basis vectors of the SiC matrix and the metal liner, respectively, in Cartesian coordinates. θ v Z v r These represent the first, second, and third basis vectors of the SiC matrix and the metal liner in cylindrical coordinates, respectively.

[0032] Furthermore, the stepwise incrementing displacement sequence set on the designated surface of the multilayer heterogeneous cladding tube geometric model is as follows: an axial incrementing displacement sequence is set on the upper surface of the heterogeneous cladding tube, and a radial incrementing displacement sequence is set on the inner surface of the heterogeneous cladding tube. The former is set along the axial direction of the heterogeneous cladding tube, starting from 0 mm and incrementing by 3 × 10. -3 mm is an incrementing sequence with a step size of 0.3 mm and a termination value of 0.3 mm; the latter is a 5×10 sequence set along the radial direction of the heterogeneous cladding tube, starting at 0 mm. -4 mm is the step size, and 0.015 mm is the incrementing sequence of the final value.

[0033] Furthermore, the termination criterion method of the Newton iteration method is that the maximum number of iterations is 20 and the maximum relative error is 0.005.

[0034] By adopting the above technical solution, the advantages and beneficial effects of the present invention are as follows:

[0035] The multilayer heterogeneous cladding tube of the present invention consists of an inner refractory metal and an outer SiC layer. f It is composed of SiC composite material, with an inner refractory metal layer having a thickness of 0.3–0.4 mm and an outer SiC layer. f The SiC composite material consists of 3 to 5 layers of SiC fiber preforms, with each layer having a braiding angle of 0° to 45°. The axial tensile strength of this multilayer heterogeneous cladding tube can reach 225 MPa, which is 17% to 28% higher than other two-dimensional braided multilayer heterogeneous tubes. Simultaneously, the circumferential tensile strength of this multilayer heterogeneous cladding tube is 183 MPa to 190 MPa, indicating that this structure also possesses good circumferential tensile strength.

[0036] Using the finite element method for structural design of multilayer heterogeneous clad tubes can not only reduce the cost of material development and testing, but also obtain the influence law of different structures on the strength of heterogeneous clad tubes by analyzing the stress-strain curves: the axial tensile strength decreases with the increase of the braiding angle, while the circumferential tensile strength mainly depends on the strength of the inner lining metal.

[0037] In addition, structural design using the finite element method can reduce the time cycle from material design to application, thereby enabling rapid optimization of accident-tolerant fuel cladding structures. Attached Figure Description

[0038] Figure 1 This is a flowchart illustrating the structural design of an embodiment of the present invention;

[0039] Figure 2 (a) is Mo-SiC f / SiC heteroclad tube, with an inner Mo metal liner and an outer SiC layer. f The SiC composite material consists of three layers of SiC fiber preforms with a braiding angle of 30°. The SiC fiber preforms include SiC fibers and SiC... f and SiC coated fibers f (a) SiC matrix; (b) Nb-SiC f / SiC heteroclad tube, with an inner Nb metal liner and an outer SiC layer. f The SiC composite material consists of three layers of SiC fiber preforms with a braiding angle of 45°. The SiC fiber preforms include SiC fibers and SiC... f and SiC coated fibers f SiC matrix;

[0040] Figure 3 The axial stress-strain curve is calculated for an embodiment of the present invention;

[0041] Figure 4 This is a diagram of the circumferential stress-strain curve calculated for an embodiment of the present invention. Detailed Implementation

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0043] High-strength metal-SiC in the embodiments of the present invention f The inner layer of the SiC heteroclad tube structure is a refractory metal, and the outer layer is SiC. f / SiC composite materials, the design method is described in Figure 1 .

[0044] Example 1

[0045] In this embodiment, metal-SiC f The inner layer of the SiC heteroclad tube is a layer of refractory molybdenum, and the outer layer is three layers of SiC. f / SiC composite material, with a weaving angle of 30°, such as Figure 2 As shown in (a);

[0046] The specific design method is as follows:

[0047] Step 1: Establish the geometric model of the multilayer heterogeneous cladding tube: Based on images obtained from scanning electron microscopy, record the geometric dimensions of the SiC fibers, SiC matrix, and metal liner, including the thicknesses of the SiC matrix, SiC fibers, and metal liner, which are 0.30 mm, 0.21 mm, and 0.4 mm, respectively; the height of the heterogeneous cladding tube is 31.45 mm, the inner diameter is 10.0 mm, and the outer diameter is 12.6 mm. The weaving path of the SiC fibers is controlled by two parametric equations, which are:

[0048]

[0049]

[0050] In the formula, R is the radius of the braided tube, mm; T is the thickness of the fiber braid, mm; w is the braiding angular velocity, rad / s; t is time, s; and v is the braiding linear velocity, mm / s.

[0051] In COMSOL Multiphysics software, three sets of single-layer prefabricated models with different weaving angles were constructed. The weaving angle of each set of single-layer prefabricated models was 30°. The overlap and gaps in the single-layer prefabricated models were removed by modifying the relative tolerance value of the single-layer prefabricated models. Then, the single-layer prefabricated models were combined into a multi-layer heterogeneous shell tube geometric model.

[0052] Step 2: Perform solid mesh generation on the geometric model of the multilayer heterogeneous cladding tube: Based on the geometric model of the multilayer heterogeneous cladding tube established in Step 1, perform tetrahedral mesh generation on each component of the model, namely SiC matrix, SiC fiber and metal liner.

[0053] Step 3, Establish a curvilinear coordinate system: Define the three basis vectors of the SiC fiber by solving the Laplace equation:

[0054]

[0055] In the formula, e1, e2, and e3 are the first, second, and third basis vectors of the SiC fiber, respectively; u2 is the basis vector of the z-axis in the Cartesian coordinate system.

[0056] The three basis vectors of the SiC matrix and the metal liner are defined using vector operations:

[0057]

[0058] v Z =v z

[0059]

[0060] In the formula, v x v y v z These are the first, second, and third basis vectors of the SiC matrix and the metal liner, respectively, in Cartesian coordinates. θ v Z v r These represent the first, second, and third basis vectors of the SiC matrix and the metal liner in cylindrical coordinates, respectively.

[0061] Step 4: Set the boundary conditions for the geometric model of the multi-layer heterogeneous clad tube: Set an axially increasing displacement sequence on the upper surface of the heterogeneous clad tube and a radially increasing displacement sequence on the inner surface of the heterogeneous clad tube. The former is along the axial direction of the heterogeneous clad tube, set with a starting value of 0 mm and a value of 3 × 10. -3 mm is an incrementing sequence with a step size of 0.3 mm and a termination value of 0.3 mm; the latter is a 5×10 sequence set along the radial direction of the heterogeneous cladding tube, starting at 0 mm. -4 An incremental sequence of mm as the step size and 0.015 mm as the termination value is used to simulate the process of heterogeneous clad tubes being subjected to axial tension and radial compression.

[0062] Step 5: Define the mechanical damage criteria for each component of the geometric model of the multilayer heterogeneous cladding tube: SiC fibers adopt the Hashin criterion (Equation 1), SiC matrix adopts the first strength theory criterion (Equation 2), and metal liner adopts the fourth strength theory criterion (Equation 3).

[0063] Formula 1:

[0064]

[0065] In the formula, σ 11 For tensile stress, τ is the tensile strength, α is the contribution factor of shear stress, and τ is the tensile strength. 12 For shear stress, This represents the shear strength.

[0066] Formula 2:

[0067] σ 11θ ≥σ t ,σ 11θ >0

[0068] In the formula, σ 11θ For tensile stress, σ t This refers to tensile strength.

[0069] Formula 3:

[0070] (σ1-σ2) 2 +(σ2-σ3) 2+(σ3-σ1) 2 ≥2σ s 2

[0071] In the formula, σ1, σ2, and σ3 are the first, second, and third principal stresses, respectively, and σ s This represents the shear strength.

[0072] Step 6: Calculate the stress-strain curves of the multilayer heterogeneous clad tube: Based on the finite element model of the multilayer heterogeneous clad tube established in Step 5, the Newton-Raphson iteration method is selected to solve for the stress-strain curves of the heterogeneous clad tube. The termination criterion for the Newton-Raphson iteration method is that the maximum number of iterations is 20, and the maximum relative error is 0.005. The calculation results are then processed to complete the plotting of the axial stress-strain curves and circumferential stress-strain curves of the heterogeneous clad tube, as shown below. Figure 3 and Figure 4 As shown in the figure: Figure 3 The axial stress value corresponding to the highest point of the Type I and Type II curves is not less than 200 MPa, indicating that Mo-SiC with a weaving angle of 30° and 45° has a structure. f / SiC heteroclad tubes have good axial tensile strength; Figure 4 The circumferential stress values ​​corresponding to the highest points of the Type I and Type II curves are not less than 183 MPa, indicating that Mo-SiC with weaving angles of 30° and 45° has a structure. f / SiC heteroclad tubes have good circumferential tensile strength.

[0073] Step 7: Determine the structural design of the high-strength multilayer heterogeneous cladding tube: Based on the two stress-strain curves calculated in Step 6, find the stress value corresponding to the highest point of the two stress-strain curves. This stress value is the axial tensile strength and circumferential tensile strength of the multilayer heterogeneous cladding tube. Figure 3 ZhongIhe Figure 4 As shown in Figure III, a three-layer Mo-SiC with a weaving angle of 30°. f The axial tensile strength of the / SiC heteroclad tube is 225MPa, and the circumferential tensile strength is 183MPa.

[0074] Example 2:

[0075] In this embodiment, metal-SiC f The inner layer of the SiC heteroclad tube is a layer of refractory metal niobium, and the outer layer is three layers of SiC. f / SiC composite material, with a weaving angle of 45°, such as Figure 2 As shown in (b);

[0076] The specific design method is as follows:

[0077] Step 1: Establish the geometric model of the multilayer heterogeneous cladding tube: Based on images obtained from scanning electron microscopy, record the geometric dimensions of the SiC fibers, SiC matrix, and metal liner, including the thicknesses of the SiC matrix, SiC fibers, and metal liner, which are 0.40 mm, 0.27 mm, and 0.3 mm, respectively. The height of the heterogeneous cladding tube is 31.45 mm, the inner diameter is 11.0 mm, and the outer diameter is 14.0 mm. The weaving path of the SiC fibers is controlled by two parametric equations, which are:

[0078]

[0079]

[0080] In the formula, R is the radius of the braided tube, mm; T is the thickness of the fiber braid, mm; w is the braiding angular velocity, rad / s; t is time, s; and v is the braiding linear velocity, mm / s.

[0081] In COMSOL Multiphysics software, three sets of single-layer prefabricated models with different weaving angles were constructed. The weaving angle of each set of single-layer prefabricated models was 45°. The overlap and gaps in the single-layer prefabricated models were removed by modifying the relative tolerance value of the single-layer prefabricated models. Then, the single-layer prefabricated models were combined into a multi-layer heterogeneous shell tube geometric model.

[0082] Step 2: Perform solid mesh generation on the geometric model of the multilayer heterogeneous cladding tube: Based on the geometric model of the multilayer heterogeneous cladding tube established in Step 1, perform tetrahedral mesh generation on each component of the model, namely SiC matrix, SiC fiber and metal liner.

[0083] Step 3, Establish a curvilinear coordinate system: Define the three basis vectors of the SiC fiber by solving the Laplace equation:

[0084]

[0085] In the formula, e1, e2, and e3 are the first, second, and third basis vectors of the SiC fiber, respectively; u2 is the basis vector of the z-axis in the Cartesian coordinate system.

[0086] The three basis vectors of the SiC matrix and the metal liner are defined using vector operations:

[0087]

[0088] v Z =v z

[0089]

[0090] In the formula, vx v y v z These are the first, second, and third basis vectors of the SiC matrix and the metal liner, respectively, in Cartesian coordinates. θ v Z v r These represent the first, second, and third basis vectors of the SiC matrix and the metal liner in cylindrical coordinates, respectively.

[0091] Step 4: Set the boundary conditions for the geometric model of the multi-layer heterogeneous clad tube: Set an axially increasing displacement sequence on the upper surface of the heterogeneous clad tube and a radially increasing displacement sequence on the inner surface of the heterogeneous clad tube. The former is along the axial direction of the heterogeneous clad tube, set with a starting value of 0 mm and a value of 3 × 10. -3 mm is an incrementing sequence with a step size of 0.3 mm and a termination value of 0.3 mm; the latter is a 5×10 sequence set along the radial direction of the heterogeneous cladding tube, starting at 0 mm. -4 An incremental sequence of mm as the step size and 0.015 mm as the termination value is used to simulate the process of heterogeneous clad tubes being subjected to axial tension and radial compression.

[0092] Step 5: Define the mechanical damage criteria for each component of the geometric model of the multilayer heterogeneous cladding tube: SiC fibers adopt the Hashin criterion (Equation 1), SiC matrix adopts the first strength theory criterion (Equation 2), and metal liner adopts the fourth strength theory criterion (Equation 3).

[0093] Formula 1:

[0094]

[0095] In the formula, σ 11 For tensile stress, τ is the tensile strength, α is the contribution factor of shear stress, and τ is the tensile strength. 12 For shear stress, This represents the shear strength.

[0096] Formula 2:

[0097] σ 11θ ≥σ t ,σ 11θ >0

[0098] In the formula, σ 11θ For tensile stress, σ t This refers to tensile strength.

[0099] Formula 3:

[0100] (σ1-σ2) 2 +(σ2-σ3) 2 +(σ3-σ1) 2 ≥2σs 2

[0101] In the formula, σ1, σ2, and σ3 are the first, second, and third principal stresses, respectively, and σ s This represents the shear strength.

[0102] Step 6: Calculate the stress-strain curves of the multilayer heterogeneous clad tube: Based on the finite element model of the multilayer heterogeneous clad tube established in Step 5, the Newton-Raphson iteration method is selected to solve for the stress-strain curves of the heterogeneous clad tube. The termination criterion for the Newton-Raphson iteration method is that the maximum number of iterations is 20, and the maximum relative error is 0.005. The calculation results are then processed to complete the plotting of the axial stress-strain curves and circumferential stress-strain curves of the heterogeneous clad tube, as shown below. Figure 3 and Figure 4 As shown.

[0103] Step 7: Determine the structural design of the high-strength multilayer heterogeneous cladding tube: Based on the two stress-strain curves calculated in Step 6, find the stress value corresponding to the highest point of the two stress-strain curves. This stress value is the axial tensile strength and circumferential tensile strength of the multilayer heterogeneous cladding tube. Figure 3 Medium II and Figure 4 As shown in Figure I, a three-layer Mo-SiC with a weaving angle of 45°. f The axial tensile strength of the / SiC heteroclad tube is 205 MPa, and the circumferential tensile strength is 190 MPa.

[0104] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A high-strength metal-SiC f / A design method for SiC heteroclad tube structures, wherein the heteroclad tube structure includes an inner metal liner and an outer SiC layer. f / SiC composite material, with an inner metal lining of refractory metal and an outer SiC layer. f / SiC composite material is a SiC fiber preform consisting of 3 to 5 layers with the same weave angle. f and SiC fiber preform f The structure consists of a SiC matrix, in which SiC fibers are present in a two-dimensional braided manner in each preform layer, with the braiding angle ranging from 0° to 45°. The braiding angle is the angle between the axis of the SiC fiber and the axis of the heterogeneous cladding tube; its characteristic is that... The design methodology includes the following steps: A. Establishing a geometric model of a multi-layer heterogeneous cladding tube: Based on images obtained from a scanning electron microscope, the geometric dimensions of SiC fibers, SiC matrix, and metal liner are recorded. Three sets of single-layer prefabricated models with different weaving angles are constructed in COMSOL Multiphysics software. The weaving angle of each single-layer prefabricated model is 0° to 45°. The overlap and gaps in the single-layer prefabricated models are removed by modifying the relative tolerance value of the single-layer prefabricated models. Then, the single-layer prefabricated models are combined into a geometric model of a multi-layer heterogeneous cladding tube. B. Solid mesh generation of the multilayer heterogeneous cladding tube geometric model: Based on the multilayer heterogeneous cladding tube geometric model established in step a, tetrahedral mesh generation is performed on each component of the model, namely SiC matrix, SiC fiber, and metal liner. C. Establishing a curvilinear coordinate system: The three basis vectors of SiC fibers are defined by solving the Laplace equation, and the three basis vectors of the SiC matrix and the metal liner are defined by vector operations, thus completing the establishment of a curvilinear coordinate system for the SiC matrix, SiC fibers, and metal liner. D. Set boundary conditions for the geometric model of the multilayer heterogeneous cladding tube: Set an increasing displacement sequence on a specified surface of the geometric model of the multilayer heterogeneous cladding tube to simulate the process of the heterogeneous cladding tube being subjected to axial tension and radial compression. E. Define the mechanical damage criteria for each component of the geometric model of the multilayer heterogeneous cladding tube: the Hashin criterion is adopted for SiC fibers, the first strength theory criterion is adopted for SiC matrix, and the fourth strength theory criterion is adopted for metal liner, thus completing the establishment of the finite element model of the multilayer heterogeneous cladding tube. F. Calculate the stress-strain curves of the multilayer heterogeneous clad tube: Based on the finite element model of the multilayer heterogeneous clad tube established in step e, select the Newton iteration method to solve the stress-strain curves of the heterogeneous clad tube, and complete the plotting of the axial stress-strain curves and circumferential stress-strain curves of the heterogeneous clad tube. G. Determine the structural design of the high-strength multilayer heterogeneous cladding tube: Based on the two stress-strain curves calculated in step f, find the stress value corresponding to the highest point of the two stress-strain curves. This stress value is the axial tensile strength and circumferential tensile strength of the multilayer heterogeneous cladding tube. The model structure corresponding to this axial tensile strength and circumferential tensile strength is the designed high-strength heterogeneous cladding tube structure.

2. A high-strength metal-SiC according to claim 1 f The design method for SiC heteroclad tube structures is characterized by... The heterogeneous cladding tube has a height of 31.45 mm, an inner diameter of 10.0–11.0 mm, and an outer diameter of 13.0–15.0 mm; the braiding path of the SiC fibers is controlled by two parametric equations, which are: In the formula, R is the radius of the braided tube (mm); T is the thickness of the fiber braid (mm); w is the braiding angular velocity (rad / s); t is the time (s); and v is the braiding linear velocity (mm / s).

3. A high-strength metal-SiC according to claim 1 f The design method for SiC heteroclad tube structures is characterized by... The multi-layer heterogeneous cladding tube geometric model mentioned in step A is formed by combining single-layer prefabricated models with the same braiding angle according to their inner diameter and in an arrangement from the inner layer to the outer layer.

4. A high-strength metal-SiC according to claim 1 f The design method for SiC heteroclad tube structures is characterized by... The three basis vectors of the SiC fiber mentioned in step C are: In the formula, e1, e2, and e3 are the first, second, and third basis vectors of the SiC fiber, respectively; u2 is the basis vector of the z-axis in the Cartesian coordinate system. u is a vector field. It is the Hamiltonian operator, t is the harmonic function, and i and j are the unit basis vectors of the x-axis and y-axis in the Cartesian coordinate system, respectively.

5. A high-strength metal-SiC according to claim 1 f The design method for SiC heteroclad tube structures is characterized by... The three basis vectors of the SiC matrix and metal liner mentioned in step C are: v Z =v z In the formula, v x v y v z These are the first, second, and third basis vectors of the SiC matrix and the metal liner, respectively, in Cartesian coordinates. θ v Z v r These represent the first, second, and third basis vectors of the SiC matrix and the metal liner in cylindrical coordinates, respectively.

6. A high-strength metal-SiC according to claim 1 f The design method for SiC heteroclad tube structures is characterized by... Step D, which involves setting an incremental displacement sequence on a designated surface of the multilayer heterogeneous cladding tube geometric model, comprises: setting an axial incremental displacement sequence on the upper surface of the heterogeneous cladding tube and setting a radial incremental displacement sequence on the inner surface of the heterogeneous cladding tube. The former is set along the axial direction of the heterogeneous cladding tube, starting at 0 mm and incrementing by 3 × 10⁻⁶. -3 mm is an incrementing sequence with a step size of 0.3 mm and a termination value of 0.3 mm; the latter is a 5×10 sequence set along the radial direction of the heterogeneous cladding tube, starting at 0 mm. -4 mm is the step size, and 0.015 mm is the incrementing sequence of the final value.

7. A high-strength metal-SiC according to claim 1 f The design method for SiC heteroclad tube structures is characterized by... The termination criterion for the Newton iteration method described in step f is that the maximum number of iterations is 20 and the maximum relative error is 0.

005.

8. A high-strength metal-SiC according to claim 1 f The design method for SiC heteroclad tube structures is characterized by... The refractory metal is one of rhenium, zirconium, molybdenum, tantalum, and niobium.

9. A high-strength metal-SiC according to claim 1 f The design method for SiC heteroclad tube structures is characterized by... The thickness of the inner metal liner is 0.3mm to 0.4mm, SiC f The thickness of the SiC composite material is 0.9mm to 1.5mm, the volume fraction of SiC fiber is not less than 30%, the inner diameter of the heterogeneous cladding tube is 10.0mm to 11.0mm, the axial tensile strength of the heterogeneous cladding tube is not less than 200MPa, and the circumferential tensile strength is 183MPa to 190MPa.

Images