Fiber reinforced ceramic pin hole edge thermal strength analysis method and related device
By adopting a progressive damage model analysis method in the fiber-reinforced ceramic structure, the problem of low accuracy in determining the hole edge structure of fiber-reinforced ceramic pins in the prior art is solved, and higher analysis accuracy and accuracy are achieved.
Patent Information
- Application Number
- CN202510008046.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2025-05-30
AI Technical Summary
In the prior art, the method of determining the failure of the hole edge structure of the fiber-reinforced ceramic pin by the hole edge stress level is largely different from the test results, and the calculation accuracy is low.
Using an analytical method based on the progressive damage model, the thermal strength analysis of fiber-reinforced ceramic materials is carried out through finite element modeling, fabric degradation model and progressive damage degradation model, and the loading is used to solve it using implicit algorithms and arc length method to determine whether the local structure is invalid.
The accuracy of thermal strength analysis of fiber-reinforced ceramic structures is greatly improved, and the failure of the local structure of the pin hole edge is accurately determined, avoiding the problem of low calculation accuracy in the prior art.
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Figure CN120068501A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of structural strength, and particularly relates to a method for analyzing the thermal strength of the edge of a fiber-reinforced ceramic pin hole and related devices. Background Art
[0002] At present, stress concentration is likely to occur at the edge of a fiber-reinforced ceramic pin hole. Currently, the structural failure is usually determined by the stress level at the hole edge. This method of determining structural failure by the stress level at the hole edge deviates greatly from the test results, and the calculation accuracy is low. Summary of the Invention
[0003] The present invention provides a method for analyzing the thermal strength of the edge of a fiber-reinforced ceramic pin hole and related devices, which can solve the technical problem that the method of determining structural failure by the stress level at the hole edge in the prior art deviates greatly from the test results and the calculation accuracy is low.
[0004] According to one aspect of the present invention, a method for analyzing the thermal strength at the edge of a pin hole in a fiber-reinforced ceramic based on a progressive damage model is provided. The method for analyzing the thermal strength at the edge of a pin hole in a fiber-reinforced ceramic includes: Step 1, performing finite element modeling on the structure; Step 2, taking the structural finite element model constructed in Step 1 as the input, adopting a fabric degradation model, and setting a progressive damage failure criterion for the fiber-reinforced ceramic material; Step 3, taking the progressive damage failure criterion set in Step 2 as the input, setting a progressive damage degradation model for the fiber-reinforced ceramic material, setting the degradation factor λ to 0.15, and when the structural stress level triggers the failure criterion, degrading the material stiffness in the corresponding direction; Step 4, taking the structural finite element model constructed in Step 1, the progressive damage failure criterion set in Step 2, and the progressive damage degradation model set in Step 3 as the input, applying a mechanical load and a thermal load, and using an implicit algorithm with large deformation enabled to solve for the mechanical load thermal strength. During the solution process, call the progressive damage failure criterion set in Step 2 to determine whether the fiber-reinforced ceramic material fails. For the failed part, call the progressive damage degradation model set in Step 3 to degrade the fiber-reinforced ceramic material; Step 5, taking the structural finite element model constructed in Step 1, the progressive damage failure criterion set in Step 2, the progressive damage degradation model set in Step 3, and the mechanical load thermal strength in Step 4 as the input, continue to apply the design mechanical load, and use the arc-length method with large deformation enabled to solve for the design mechanical load thermal strength. During the solution process, call the progressive damage failure criterion set in Step 2 to determine whether the fiber-reinforced ceramic material fails. For the failed part, call the progressive damage degradation model set in Step 3 to degrade the fiber-reinforced ceramic material, and calculate until the applied load reaches the design mechanical load, or the arc-length method automatically unloads; Step 6, taking the design mechanical load thermal strength obtained in Step 5 as the input, when the calculation in Step 5 reaches the design mechanical load, if the single tensile failure range at the edge of the pin hole in the fiber-reinforced ceramic structure is less than the area of the pin hole and does not reach the structure edge, and the tensile failure ranges at the edges of adjacent pin holes do not form a connection, it is determined that the local structure at the edge of the pin hole does not fail, otherwise it is considered to have failed; if the arc-length method automatically unloads, it is considered to have failed.
[0005] Further, in Step 1, the fiber-reinforced ceramic structure and the pin structure are modeled using hexahedral solid elements, and other components are modeled using hexahedral or high-order tetrahedral solid elements. The number of elements around the pin hole is greater than or equal to 16, and a sliding contact is set between the pin hole and the pin.
[0006] Further, other components include a connecting ring.
[0007] Further, the specific expression of the progressive damage failure criterion is:
[0008] where σ 11is the tensile stress in the 1 direction, τ 12 is the shear stress in the 1-2 direction, τ 13 is the shear stress in the 1-3 direction, X T is the allowable tensile stress in the 1 direction, S 12 is the allowable shear stress in the 1-2 direction, S 13 is the allowable shear stress in the 1-3 direction, X C is the allowable compressive stress in the 1 direction, σ 22 is the tensile stress in the 2 direction, τ 23 is the shear stress in the 2-3 direction, Y T is the allowable tensile stress in the 2 direction, S 23 is the allowable shear stress in the 2-3 direction, Y C is the allowable compressive stress in the 2 direction, σ 33 is the tensile stress in the 3 direction, Z T is the allowable tensile stress in the 3 direction, Z C is the allowable compressive stress in the 3 direction.
[0009] Furthermore, the specific expression of the progressive damage failure criterion is:
[0010] Among them, is the degraded tensile modulus in the 1 direction, is the initial tensile modulus in the 1 direction, is the degraded shear modulus in the 1-2 direction, is the initial shear modulus in the 1-2 direction, is the degraded shear modulus in the 1-3 direction, is the initial shear modulus in the 1-3 direction, is the degraded Poisson's ratio in the 1-2 direction, is the initial Poisson's ratio in the 1-2 direction, is the degraded Poisson's ratio in the 1-3 direction, is the initial Poisson's ratio in the 1-3 direction, is the degraded tensile modulus in the 2 direction, is the initial tensile modulus in the 2 direction, is the degraded shear modulus in the 2-3 direction, is the initial shear modulus in the 2-3 direction, is the degraded Poisson's ratio in the 2-3 direction, is the initial Poisson's ratio in the 2-3 direction, is the degraded tensile modulus in the 3 direction, is the initial tensile modulus in the 3 direction.
[0011] Furthermore, in step four, both the initial increment step and the maximum increment step are set to 0.1.
[0012] Further, in Step Five, both the initial increment step and the maximum increment step are set to 0.1.
[0013] According to another aspect of the present invention, there is provided a fiber-reinforced ceramic pin-hole edge thermal strength analysis system based on a progressive damage model. The fiber-reinforced ceramic pin-hole edge thermal strength analysis system uses the fiber-reinforced ceramic pin-hole edge thermal strength analysis method as described above to perform fiber-reinforced ceramic pin-hole edge thermal strength analysis.
[0014] According to yet another aspect of the present invention, there is provided a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the computer program to implement the steps of the fiber-reinforced ceramic pin-hole edge thermal strength analysis method based on a progressive damage model as described above.
[0015] According to still another aspect of the present invention, there is provided a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, it implements the steps of a fiber-reinforced ceramic pin-hole edge thermal strength analysis method based on a progressive damage model as described above.
[0016] Applying the technical solution of the present invention, there is provided a fiber-reinforced ceramic pin-hole edge thermal strength analysis method based on a progressive damage model. This method introduces the composite material progressive damage model into the thermal strength analysis of fiber-reinforced ceramic structures, uses the progressive damage model to carry out the thermal strength analysis of fiber-reinforced ceramic structures, simulates the development process of material failure for the local structure of the pin-hole edge where stress concentration is likely to occur, and determines whether the local structure fails based on the range of material failure, greatly improving the analysis accuracy. It is a practical new fiber-reinforced ceramic structure thermal strength analysis method. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The accompanying drawings included are used to provide a further understanding of the embodiments of the present invention, which form a part of the specification, illustrate the embodiments of the present invention, and together with the written description are used to explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings without creative efforts based on these drawings.
[0018] Figure 1 Shows an implementation flowchart of a fiber-reinforced ceramic pin-hole edge thermal strength analysis method based on a progressive damage model provided according to a specific embodiment of the present invention;
[0019] Figure 2 Shows a schematic diagram of the connection of the tensile failure ranges of adjacent pin-hole edges of a fiber-reinforced ceramic structure provided according to a specific embodiment of the present invention;
[0020] Figure 3 It shows a schematic diagram of the single tensile failure range at the edge of the pin hole of the fiber-reinforced ceramic structure provided according to a specific embodiment of the present invention being larger than the area of the pin hole. Detailed implementation manners
[0021] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.
[0022] It should be noted that the terms used herein are only for describing the specific implementation manners and are not intended to limit the exemplary implementation manners according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0023] Unless otherwise specifically stated, the relative arrangements of the components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.
[0024] As Figure 1As shown, according to a specific embodiment of the present invention, a method for analyzing the thermal strength of the edge of a fiber-reinforced ceramic pin hole based on a progressive damage model is provided. The method for analyzing the thermal strength of the edge of a fiber-reinforced ceramic pin hole includes: Step 1, performing finite element modeling on the structure; Step 2, taking the structural finite element model constructed in Step 1 as input, adopting a fabric degradation model, and setting a progressive damage failure criterion for the fiber-reinforced ceramic material; Step 3, taking the progressive damage failure criterion set in Step 2 as input, setting a progressive damage degradation model for the fiber-reinforced ceramic material, setting the degradation factor λ to 0.15, and when the structural stress level triggers the failure criterion, degrading the material stiffness in the corresponding direction; Step 4, taking the structural finite element model constructed in Step 1, the progressive damage failure criterion set in Step 2, and the progressive damage degradation model set in Step 3 as input, applying a force load and a thermal load, using an implicit algorithm with large deformation enabled to solve for the thermal strength of the force load, and calling the progressive damage failure criterion set in Step 2 during the solution process to determine whether the fiber-reinforced ceramic material fails. For the failed part, calling the progressive damage degradation model set in Step 3 to degrade the fiber-reinforced ceramic material; Step 5, taking the structural finite element model constructed in Step 1, the progressive damage failure criterion set in Step 2, the progressive damage degradation model set in Step 3, and the thermal strength of the force load in Step 4 as input, continuing to apply the design force load, using the arc-length method with large deformation enabled to solve for the thermal strength of the design force load, and calling the progressive damage failure criterion set in Step 2 during the solution process to determine whether the fiber-reinforced ceramic material fails. For the failed part, calling the progressive damage degradation model set in Step 3 to degrade the fiber-reinforced ceramic material, and calculating until the applied force load reaches the design force load, or the arc-length method automatically unloads; Step 6, taking the thermal strength of the design force load obtained in Step 5 as input, when the calculation in Step 5 reaches the design force load, if the single tensile failure range at the edge of the pin hole of the fiber-reinforced ceramic structure is less than the area of the pin hole and does not reach the structural edge, and the tensile failure ranges at the edges of adjacent pin holes do not form a connection, it is determined that the local structure at the edge of the pin hole does not fail, otherwise it is considered to have failed; if the arc-length method automatically unloads, it is considered to have failed.
[0025] Applying this configuration method, a method for analyzing the thermal strength of the edge of a fiber-reinforced ceramic pin hole based on a progressive damage model is provided. This method introduces the composite material progressive damage model into the thermal strength analysis of fiber-reinforced ceramic structures, uses the progressive damage model to carry out the thermal strength analysis of fiber-reinforced ceramic structures, simulates the development process of material failure for the local structure at the edge of the pin hole where stress concentration is likely to occur, and determines whether the local structure fails based on the material failure range, greatly improving the analysis accuracy. It is a practical new method for analyzing the thermal strength of fiber-reinforced ceramic structures.
[0026] Specifically, in Step 1, the fiber-reinforced ceramic structure and the pin structure are modeled using hexahedral solid elements, and other components are modeled using hexahedral or high-order tetrahedral solid elements. The number of elements around the pin hole is greater than or equal to 16, and a sliding contact is set between the pin hole and the pin. As a specific embodiment of the present invention, the other components include a connecting ring.
[0027] Further, in the present invention, the specific expression of the progressive damage failure criterion is:
[0028] where σ 11 is the tensile stress in the 1 direction, τ 12 is the shear stress in the 12 direction, τ 13 is the shear stress in the 13 direction, X T is the allowable tensile stress in the 1 direction, S 12 is the allowable shear stress in the 12 direction, S 13 is the allowable shear stress in the 13 direction, X C is the allowable compressive stress in the 1 direction, σ 22 is the tensile stress in the 2 direction, τ 23 is the shear stress in the 23 direction, Y T is the allowable tensile stress in the 2 direction, S 23 is the allowable shear stress in the 23 direction, Y C is the allowable compressive stress in the 2 direction, σ 33 is the tensile stress in the 3 direction, Z T is the allowable tensile stress in the 3 direction, Z C is the allowable compressive stress in the 3 direction.
[0029] In the present invention, the specific expression of the progressive damage failure criterion is:
[0030] where, is the degraded tensile modulus in the 1 direction, is the initial tensile modulus in the 1 direction, is the degraded shear modulus in the 12 direction, is the initial shear modulus in the 12 direction, is the degraded shear modulus in the 13 direction, is the initial shear modulus in the 13 direction, is the degraded Poisson's ratio in the 12 direction, is the initial Poisson's ratio in the 12 direction, is the degraded Poisson's ratio in the 13 direction, is the initial Poisson's ratio in the 13 direction, is the degraded tensile modulus in the 2 direction, is the initial tensile modulus in the 2 direction, is the shear modulus in the 2-3 direction after degradation, is the initial shear modulus in the 2-3 direction, is the Poisson's ratio in the 2-3 direction after degradation, is the initial Poisson's ratio in the 2-3 direction, is the tensile modulus in the 3 direction after degradation, is the initial tensile modulus in the 3 direction.
[0031] In addition, in the present invention, in step four, taking the structural finite element model constructed in step one, the progressive damage failure criterion set in step two, and the progressive damage degradation model set in step three as inputs, applying force loads and thermal loads, using an implicit algorithm with large deformation enabled to solve for the thermal strength under force loads. During the solution process, the progressive damage failure criterion set in step two is called to determine whether the fiber-reinforced ceramic material fails. For the failed part, the progressive damage degradation model set in step three is called to degrade the fiber-reinforced ceramic material. Both the initial increment step and the maximum increment step are set to 0.1. Loading the force loads and thermal loads synchronously in this way is to avoid the change in the stress form at the hole edge caused by the separate application of force and thermal loads.
[0032] In step five, taking the structural finite element model constructed in step one, the progressive damage failure criterion set in step two, the progressive damage degradation model set in step three, and the thermal strength under force loads in step four as inputs, continue to apply the designed force load, using the arc-length method with large deformation enabled to solve for the thermal strength under the designed force load. During the solution process, the progressive damage failure criterion set in step two is called to determine whether the fiber-reinforced ceramic material fails. For the failed part, the progressive damage degradation model set in step three is called to degrade the fiber-reinforced ceramic material, and calculate until the applied force load reaches the designed force load, or the arc-length method automatically unloads. Both the initial increment step and the maximum increment step are set to 0.1. In the present invention, using the arc-length method to solve for the designed force load improves the solution accuracy of the failure point.
[0033] According to another aspect of the present invention, there is provided a fiber-reinforced ceramic pin hole edge thermal strength analysis system based on a progressive damage model. This fiber-reinforced ceramic pin hole edge thermal strength analysis system uses the fiber-reinforced ceramic pin hole edge thermal strength analysis method as described above to analyze the thermal strength at the edge of the fiber-reinforced ceramic pin hole.
[0034] By applying this configuration method, a thermal strength analysis system for the edge of a pin hole in a fiber-reinforced ceramic based on a progressive damage model is provided. This system introduces the composite material progressive damage model into the thermal strength analysis of fiber-reinforced ceramic structures, and uses the progressive damage model to carry out the thermal strength analysis of fiber-reinforced ceramic structures. For the local structure of the pin hole edge where stress concentration is likely to occur, it simulates the development process of material failure, and determines whether the local structure fails based on the range of material failure, greatly improving the analysis accuracy. It is a practical new method for thermal strength analysis of fiber-reinforced ceramic structures.
[0035] According to another aspect of the present invention, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the computer program to implement the steps of the above-mentioned thermal strength analysis method for the edge of a pin hole in a fiber-reinforced ceramic based on a progressive damage model.
[0036] According to still another aspect of the present invention, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program, and is characterized in that when the computer program is executed by a processor, it implements the steps of the above-mentioned thermal strength analysis method for the edge of a pin hole in a fiber-reinforced ceramic based on a progressive damage model.
[0037] For a further understanding of the present invention, the following combines Figures 1 to 3 to elaborate in detail on the thermal strength analysis method for the edge of a pin hole in a fiber-reinforced ceramic provided by the present invention.
[0038] As Figures 1 to 3 shown, according to a specific embodiment of the present invention, a thermal strength analysis method for the edge of a pin hole in a fiber-reinforced ceramic based on a progressive damage model is provided. The purpose of the present invention is to improve the calculation accuracy of the local structure of the pin hole edge in the thermal strength analysis of fiber-reinforced ceramic structures.
[0039] The purpose of the present invention is achieved through the following technical solutions:
[0040] Step 1: Structural finite element modeling.
[0041] First, divide the mesh of the structure. The fiber-reinforced ceramic structure (i.e., the radome) and the pin structure are modeled using hexahedral solid elements, and other components (such as: the connecting ring) are modeled using hexahedral or high-order tetrahedral solid elements. The number of elements around the pin hole (i.e., the pin and the pin hole) is not less than 16, and a sliding contact is set between the pin hole and the pin.
[0042] Step 2: Set the progressive damage failure criterion.
[0043] Taking the structural finite element model constructed in Step 1 as the input, a fabric degradation model is adopted, and a progressive damage failure criterion is set for the fiber-reinforced ceramic material. The specific expression is as follows:
[0044] Failure in the mother direction under tension (σ 11 > 0):
[0045] Failure in the mother direction under compression (σ 11 < 0):
[0046] Failure in the circumferential direction under tension (σ 22 > 0):
[0047] Failure in the circumferential direction under compression (σ 22 < 0):
[0048] Failure in the interlaminar direction under tension (σ 33 > 0):
[0049] Failure in the interlaminar direction under compression (σ 33 < 0):
[0050] Among them, σ 11 is the tensile stress in the 1 direction, τ 12 is the shear stress in the 12 direction, τ 13 is the shear stress in the 13 direction, X T is the allowable tensile stress in the 1 direction, S 12 is the allowable shear stress in the 12 direction, S 13 is the allowable shear stress in the 13 direction, X C is the allowable compressive stress in the 1 direction, σ 22 is the tensile stress in the 2 direction, τ 23 is the shear stress in the 23 direction, Y T is the allowable tensile stress in the 2 direction, S 23 is the allowable shear stress in the 23 direction, Y C is the allowable compressive stress in the 2 direction, σ 33 is the tensile stress in the 3 direction, Z T is the allowable tensile stress in the 3 direction, Z C is the allowable compressive stress in the 3 direction.
[0051] Step 3. Setting the progressive damage degradation model.
[0052] Taking the progressive damage failure criterion set in Step 2 as the input, a progressive damage degradation model is set for the fiber-reinforced ceramic material, and the degradation factor λ is set to 0.15. When the stress level of the fiber-reinforced ceramic structure triggers the failure criterion, the material stiffness in the corresponding direction of degradation is as follows:
[0053] Longitudinal tension and / or compression failure: Circumferential tension and compression failure: Interlaminar tension and compression failure:
[0054] Step 4: Calculate the thermal strength under force load.
[0055] Taking the structural finite element model constructed in Step 1 and the progressive damage model (the progressive damage model includes the progressive damage failure criterion and the progressive damage degradation model) set in Steps 2 and 3 as inputs, apply the force load and thermal load, and solve using the implicit algorithm with large deformation enabled. During the solution process, call the progressive damage failure criterion to determine whether the fiber ceramic material fails. For the failed parts, call the progressive damage degradation model to degrade the fiber-reinforced ceramic material. Both the initial increment step and the maximum increment step are set to 0.1. In Step 4, performing force-thermal loading synchronously can avoid the change in the force form at the hole edge caused by loading the force load and thermal load separately.
[0056] Step 5: Calculate the thermal strength under design force load.
[0057] Taking the structural finite element model constructed in Step 1, the progressive damage model set in Steps 2 and 3, and the analysis result obtained in Step 4 (i.e., the thermal strength under force load) as inputs, continue to apply the design force load and solve using the arc-length method with large deformation enabled. During the solution process, call the progressive damage model to degrade the fiber-reinforced ceramic material. Both the initial increment step and the maximum increment step are set to 0.1. Calculate until the applied force load reaches the design force load, or the arc-length method automatically unloads. In Step 5, using the arc-length method to solve the design force load improves the solution accuracy of the failure point.
[0058] Step 6: Interpret the calculation results.
[0059] Taking the thermal strength under design force load obtained in Step 5 as the input, when in Step 5 the calculation reaches the point where the applied force load reaches the design force load, if the single tensile failure range at the edge of the pin hole in the fiber-reinforced ceramic structure is less than the area of the pin hole and does not reach the structure edge, and the tensile failure ranges at the edges of adjacent pin holes do not form a connection, it is determined that the local structure at the pin hole edge has not failed; otherwise, it is considered to have failed. If the arc-length method automatically unloads, it is considered to have failed.
[0060] In summary, the present invention proposes a novel method for thermal strength analysis of the pin hole edge of a fiber-reinforced ceramic structure. The progressive damage model can be used to carry out the thermal strength analysis of the fiber-reinforced ceramic structure. The connectivity and area of the material failure range at the pin hole edge are used as the local structure failure criterion. This method introduces the composite material progressive damage model into the thermal strength analysis of the fiber-reinforced ceramic structure, and uses the progressive damage model to carry out the thermal strength analysis of the fiber-reinforced ceramic structure. For the local structure of the pin hole edge where stress concentration is likely to occur, the development process of material failure is simulated, and whether the local structure fails is determined based on the material failure range, greatly improving the analysis accuracy. It is a practical new method for thermal strength analysis of the fiber-reinforced ceramic structure.
[0061] For ease of description, spatial relative terms, such as "above", "on top of", "on the upper surface", "above", etc., may be used herein to describe the spatial positional relationship of one device or feature to another device or feature as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, the device described as "above" or "on top of" another device or structure will then be positioned "below" or "beneath" the other device or structure. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations), and the corresponding explanations for the spatial relative descriptions used herein will be made accordingly.
[0062] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without further statement, the above terms have no special meaning, and thus should not be construed as limiting the protection scope of the present invention.
[0063] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A thermal strength analysis method for fiber reinforced ceramic pin hole edge based on progressive damage model, characterized in that: The fiber reinforced ceramic pin hole edge thermal strength analysis method comprises: Step 1: finite element modeling of the structure; Step 2, using the structural finite element model constructed in step 1 as input, using a fabric degradation model, and setting a progressive damage failure criterion for the fiber-reinforced ceramic material; Step 3, using the progressive damage failure criterion set in step 2 as input, setting a progressive damage degradation model for the fiber reinforced ceramic material, setting the degradation factor λ to 0.15, and degrading the material stiffness in the corresponding direction when the structural stress level triggers the failure criterion; Step 4: using the structural finite element model constructed in the step 1, the progressive damage failure criterion set in the step 2, and the progressive damage degradation model set in the step 3 as input, loading the use force load and the thermal load, using the implicit algorithm with large deformation enabled to solve and calculate the use force load thermal intensity, calling the progressive damage failure criterion set in the step 2 during the solution process to determine whether the fiber reinforced ceramic material has failed, and for the failed part, calling the progressive damage degradation model set in the step 3 to degrade the fiber reinforced ceramic material; Step 5: Using the structural finite element model constructed in the step 1, the progressive damage failure criterion set in the step 2, the progressive damage degradation model set in the step 3, and the use force load thermal intensity in the step 4 as input, continue to load the design force load, use the arc length method with large deformation turned on to solve the design force load thermal intensity, call the progressive damage failure criterion set in the step 2 during the solution process to determine whether the fiber reinforced ceramic material has failed, and for the failed part, call the progressive damage degradation model set in the step 3 to degrade the fiber reinforced ceramic material, and calculate until the loaded force load reaches the design force load, or the arc length method is automatically unloaded; Step six, taking the design force load thermal strength obtained in step five as input, when step five calculates that the loading force load reaches the design force load, the single tensile failure range of the pin hole edge of the fiber reinforced ceramic structure is smaller than the pin hole area and does not reach the edge of the structure, and the tensile failure ranges of adjacent pin hole edges are not connected, it is determined that the local structure of the pin hole edge has not failed, otherwise it is considered that failure has occurred; if the arc length method automatically unloads, it is considered that failure has occurred.
2. The thermal strength analysis method of fiber reinforced ceramic pin hole edge based on progressive damage model according to claim 1 is characterized in that: In step one, the fiber reinforced ceramic structure and the pin structure are modeled using hexahedral solid elements, and other components are modeled using hexahedral or high-order tetrahedral solid elements. The number of elements around the pin hole is greater than or equal to 16, and sliding contact is set between the pin hole and the pin.
3. The thermal strength analysis method of fiber reinforced ceramic pin hole edge based on progressive damage model according to claim 2 is characterized in that: The other components include a connecting ring.
4. The thermal strength analysis method for the hole edge of fiber reinforced ceramic pin based on the progressive damage model according to any one of claims 1 to 3, characterized in that: The specific expression of the progressive damage failure criterion is: Among them, σ 11 is the tensile stress in one direction, τ 12 is the shear stress in the 12-direction direction, τ 13 is the shear stress in the 13 direction, X T is the allowable tensile stress in direction 1, S 12 is the allowable shear stress in 12 directions, S 13 is the allowable shear stress in the 13 direction, X C is the allowable compressive stress in direction 1, σ 22 is the tensile stress in two directions, τ 23 is the shear stress in the 23 direction, Y T is the allowable tensile stress in two directions, S 23 is the allowable shear stress in the 23 direction, Y C is the allowable compressive stress in two directions, σ 33 is the tensile stress in three directions, Z T is the allowable tensile stress in three directions, Z C is the allowable compressive stress in three directions.
5. The thermal strength analysis method of fiber reinforced ceramic pin hole edge based on progressive damage model according to claim 4 is characterized in that: The specific expression of the progressive damage failure criterion is: in, is the tensile modulus in one direction after degradation, is the initial tensile modulus in 1 direction, is the shear modulus in 12 directions after degradation, is the initial 12-direction shear modulus, is the shear modulus in 13 directions after degradation, is the initial 13-direction shear modulus, is the Poisson's ratio in 12 directions after degradation, is the initial 12-direction Poisson’s ratio, is the Poisson's ratio in 13 directions after degradation, is the initial 13-direction Poisson’s ratio, is the tensile modulus in two directions after degradation, is the initial 2-direction tensile modulus, is the shear modulus in 23 directions after degradation, is the initial 23-direction shear modulus, is the Poisson's ratio in 23 directions after degradation, is the initial 23-direction Poisson’s ratio, is the tensile modulus in three directions after degradation, is the initial three-direction tensile modulus.
6. The thermal strength analysis method of fiber reinforced ceramic pin hole edge based on progressive damage model according to claim 1 is characterized in that: In step 4, the initial incremental step and the maximum incremental step are both set to 0.
1.
7. The thermal strength analysis method of fiber reinforced ceramic pin hole edge based on progressive damage model according to claim 1 is characterized in that: In step five, the initial incremental step and the maximum incremental step are both set to 0.
1.
8. A fiber-reinforced ceramic pin hole edge thermal strength analysis system based on a progressive damage model, characterized in that: The fiber-reinforced ceramic pin hole edge thermal strength analysis system uses the fiber-reinforced ceramic pin hole edge thermal strength analysis method as described in any one of claims 1 to 7 to perform fiber-reinforced ceramic pin hole edge thermal strength analysis.
9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: The processor executes the computer program to implement the steps of the thermal strength analysis method for the hole edge of a fiber-reinforced ceramic pin based on a progressive damage model according to any one of claims 1 to 7.
10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of a method for analyzing the thermal strength of a fiber reinforced ceramic pin hole edge based on a progressive damage model as described in any one of claims 1 to 7 are implemented.