Method and device for monitoring multi-level fatigue damage evolution of woven ceramic matrix composites
Through the combination of fracture mechanics and interface slip mechanism, the fatigue peak stress and unloading reverse slip length of braided ceramic matrix composite materials were analyzed, which solved the problem that the existing technology could not accurately monitor the damage evolution under multi-stage fatigue loads, and realized the problem of Accurate monitoring of damage evolution of woven ceramic matrix composites improves its safety and reliability.
Patent Information
- Application Number
- CN202410969094.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2044-07-19
AI Technical Summary
The prior art cannot accurately monitor the evolution of damage of woven ceramic matrix composites under multi-stage fatigue loads, affecting their use reliability and safety.
The interface debonding length and unloading reverse slip length of fatigue peak stress were obtained by fracture mechanics. Combined with the interface slip mechanism and shear hysteresis model, the fiber unloading and reloading stress distribution was analyzed, the reciprocal of the phase-cutting modulus was calculated, and the multi-stage was determined. Fatigue damage evolution under load.
It can accurately monitor the damage evolution of braided ceramic matrix composites under multi-stage fatigue loads, and improve its reliability and safety.
Smart Images
Figure CN118501039B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of structural strength detection, and in particular to a method and a device for monitoring the evolution of multi-stage fatigue damage of a woven ceramic matrix composite material. Background Art
[0002] Ceramic-based composites have the advantages of high temperature resistance, corrosion resistance, low density, high specific strength, and high specific modulus. Compared with high-temperature alloys, they can withstand higher temperatures, reduce cooling airflow, and improve turbine efficiency. They have been used in aircraft engine combustion chambers, turbine guide blades, turbine blade disks, tail nozzles, etc. The Leading Edge Aviation Propulsion (LEAP) series of engines developed by CFM uses woven ceramic-based composite components in the high-pressure turbine. The woven ceramic-based composite structure is subjected to multi-level fatigue loads under actual working conditions. Monitoring its multi-level fatigue damage is a prerequisite for ensuring its reliability and safety. However, existing technologies cannot accurately monitor the damage evolution of woven ceramic-based composites under multi-level fatigue loads. Summary of the invention
[0003] The purpose of the present invention is to provide a method and device for monitoring the multi-stage fatigue damage evolution of a woven ceramic matrix composite material, which can accurately monitor the damage evolution of the woven ceramic matrix composite material under multi-stage fatigue loads.
[0004] To achieve the above object, the present invention provides a method for monitoring the evolution of multi-level fatigue damage of a woven ceramic matrix composite material, comprising:
[0005] The fracture mechanics method is used to obtain the cycle-dependent interface debonding length of the first-level fatigue peak stress and the cycle-dependent interface debonding length of the second-level fatigue peak stress of the woven ceramic matrix composite material;
[0006] Based on the interface slip mechanism and the cycle-dependent interface debonding length of the second-level fatigue peak stress, the cycle-dependent unloading interface reverse slip length of the second-level fatigue peak stress is determined by using the fracture mechanics method;
[0007] Based on the cycle-dependent interface debonding length and unloading interface reverse slip length of the second-level fatigue peak stress, the shear lag model is used to analyze the fiber unloading axial stress distribution of the second-level fatigue peak stress, and the unloading strain of the braided ceramic matrix composite is obtained;
[0008] Based on the interface slip mechanism and the cycle-dependent interface debonding length of the second-level fatigue peak stress, the new reloading interface slip length of the cycle-dependent second-level fatigue peak stress is determined by using the fracture mechanics method;
[0009] Based on the cycle-dependent interface debonding length of the second-level fatigue peak stress, the shear lag model is used to analyze the fiber reloading axial stress distribution of the second-level fatigue peak stress, and the reloading strain of the braided ceramic matrix composite is obtained;
[0010] Based on the cycle-dependent interface debonding length and unloading interface reverse slip length of the second-level fatigue peak stress, the inverse of the tangent modulus during unloading and reloading is calculated to determine the fatigue damage evolution of the woven ceramic matrix composite under multi-level loading.
[0011] To achieve the above objectives, the present invention also provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above method for monitoring the evolution of multi-stage fatigue damage of woven ceramic matrix composite materials.
[0012] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects: the present invention adopts a fracture mechanics method to obtain the cyclically dependent interface debonding length of the first-level fatigue peak stress and the cyclically dependent interface debonding length of the second-level fatigue peak stress of the woven ceramic matrix composite material, and then based on the interface slip mechanism, adopts a fracture mechanics method to determine the cyclically dependent unloading interface reverse slip length of the second-level fatigue peak stress, adopts a shear lag model to analyze the fiber unloading axial stress distribution of the second-level fatigue peak stress, and obtains the unloading strain of the woven ceramic matrix composite material, and based on the interface slip mechanism, adopts a fracture mechanics method to determine the cyclically dependent reloading interface new slip length of the second-level fatigue peak stress, and then adopts a shear lag model to analyze the fiber reloading axial stress distribution of the second-level fatigue peak stress, and obtains the reloading strain of the woven ceramic matrix composite material, and finally calculates the inverse of the tangent phase modulus during the unloading and reloading process to determine the fatigue damage evolution of the woven ceramic matrix composite material under multi-level loads, and can accurately monitor the damage evolution of the woven ceramic matrix composite material under multi-level fatigue loads. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0014] Figure 1 A flow chart of a method for monitoring the evolution of multi-stage fatigue damage of a woven ceramic matrix composite material provided by the present invention.
[0015] Figure 2Reloading fatigue damage parameters of two-dimensional woven SiC / SiC composites under multi-level loading Stress variation curve with reloading.
[0016] Figure 3 This is a diagram of the internal structure of a computer device. DETAILED DESCRIPTION
[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0019] like Figure 1 As shown, the method for monitoring the evolution of multi-level fatigue damage of a woven ceramic matrix composite material provided by the present invention includes steps 1 to 6.
[0020] Step 1: Using fracture mechanics method, obtain the cycle-dependent interface debonding length of the first-order fatigue peak stress and the cycle-dependent interface debonding length of the second-order fatigue peak stress of the woven ceramic matrix composite material, wherein the woven ceramic matrix composite material is composed of fiber and matrix.
[0021] Specifically, the fracture mechanics interface debonding criterion is: .
[0022] in, is the interfacial debonding energy, F The fibers in the matrix crack plane bear the load. is the fiber radius of the woven ceramic matrix composite, is the fiber axial displacement in the matrix crack plane, is the interface debonding length, is the interface shear stress, is the displacement of the fiber relative to the matrix.
[0023] The cycle-dependent interfacial debonding length of the first-order fatigue peak stress is obtained using the following formula.
[0024] .
[0025] in, is the cycle-dependent interfacial debonding length of the first-stage fatigue peak stress, is the first level fatigue peak stress,N is the number of cycles, is the fiber radius of the woven ceramic matrix composite, is the volume content of the matrix of the woven ceramic matrix composite, is the fiber volume content of the woven ceramic matrix composite, is the matrix elastic modulus of the woven ceramic matrix composite, is the fiber elastic modulus of the woven ceramic matrix composite, is the elastic modulus of the woven ceramic matrix composite, is the cycle-dependent interfacial shear stress, is the shear lag model parameter, is the interface debonding energy.
[0026] The cycle-dependent interfacial debonding length of the second-stage fatigue peak stress is obtained using the following formula.
[0027] .
[0028] in, is the cycle-dependent interfacial debonding length of the second-stage fatigue peak stress, is the second level fatigue peak stress, is the steady-state interface shear stress, is the interface debonding length of the first level fatigue peak stress.
[0029] Step 2: Based on the interface slip mechanism and the cyclic-dependent interface debonding length of the second-level fatigue peak stress, the fracture mechanics method is used to determine the cyclic-dependent unloading interface reverse slip length of the second-level fatigue peak stress. The interface slip mechanism is the slip mechanism of the fiber relative to the matrix at the interface during unloading and reloading.
[0030] Specifically, the cycle-dependent unloading interface reverse slip length of the second-level fatigue peak stress is determined using the following formula.
[0031] .
[0032] in, is the cycle-dependent reverse slip length of the unloading interface for the second-stage fatigue peak stress, To unload stress.
[0033] Step 3: Based on the cycle-dependent interface debonding length and unloading interface reverse slip length of the second-level fatigue peak stress, the shear lag model is used to analyze the fiber unloading axial stress distribution of the second-level fatigue peak stress to obtain the unloading strain of the woven ceramic matrix composite material.
[0034] Specifically, the unloading strain of the woven ceramic matrix composite is obtained using the following formula.
[0035] .
[0036] in, is the unloading strain of the woven ceramic matrix composite, is the second level fatigue peak stress The matrix crack spacing, is the fiber axial stress in the interface bonding zone, is the axial stress of the matrix in the interface bonding area, is the matrix crack spacing, is the interface debonding ratio, is the thermal residual strain.
[0037] Step 4: Based on the interface slip mechanism and the cyclic-dependent interface debonding length of the second-level fatigue peak stress, the fracture mechanics method is used to determine the cyclic-dependent reloading interface new slip length of the second-level fatigue peak stress.
[0038] Specifically, the cycle-dependent new slip length of the reloading interface of the second-level fatigue peak stress is determined using the following formula.
[0039] .
[0040] in, is the new slip length of the reloaded interface for the cycle-dependent second-stage fatigue peak stress, is the second level fatigue peak stress The unloading interface sliding length at To reload stress.
[0041] Step 5: Based on the cycle-dependent interface debonding length of the second-level fatigue peak stress, the shear lag model is used to analyze the fiber reloading axial stress distribution of the second-level fatigue peak stress to obtain the reloading strain of the woven ceramic matrix composite material.
[0042] Specifically, the reloading strain of the woven ceramic matrix composite was obtained using the following formula.
[0043] .
[0044] in, The reloading strain of the woven ceramic matrix composite is To reload stress The new slip length of the interface at is the reverse sliding length of the unloading interface.
[0045] Step 6: Based on the cyclically dependent interface debonding length and unloading interface reverse slip length of the second-level fatigue peak stress, the inverse of the tangent modulus during unloading and reloading is calculated to determine the fatigue damage evolution of the woven ceramic matrix composite under multi-level loading.
[0046] Specifically, the following formula is used to determine the fatigue damage evolution of woven ceramic matrix composites under multi-level loading.
[0047] .
[0048] .
[0049] .
[0050] .
[0051] in, is the second level fatigue peak stress Unloading fatigue damage parameters, is the second level fatigue peak stress Reload fatigue damage parameters, is the second level fatigue peak stress Unloading strain difference, is the second level fatigue peak stress Reload strain difference, To unload stress The corresponding strain difference is, To reload stress The corresponding strain difference is, is the fatigue peak stress.
[0052] like Figure 2 The reloading fatigue damage parameters of two-dimensional woven SiC / SiC composites under multi-level loading are shown in Stress variation curve with reloading.
[0053] The present invention adopts a fracture mechanics method to obtain the cyclically dependent interface debonding length of the first-level fatigue peak stress and the cyclically dependent interface debonding length of the second-level fatigue peak stress of the woven ceramic matrix composite material, and then based on the interface slip mechanism, adopts a fracture mechanics method to determine the cyclically dependent unloading interface reverse slip length of the second-level fatigue peak stress, adopts a shear lag model to analyze the fiber unloading axial stress distribution of the second-level fatigue peak stress, and obtains the unloading strain of the woven ceramic matrix composite material, and based on the interface slip mechanism, adopts a fracture mechanics method to determine the cyclically dependent reloading interface new slip length of the second-level fatigue peak stress, and then adopts a shear lag model to analyze the fiber reloading axial stress distribution of the second-level fatigue peak stress, and obtains the reloading strain of the woven ceramic matrix composite material, and finally calculates the inverse of the tangent phase modulus during the unloading and reloading process to determine the fatigue damage evolution of the woven ceramic matrix composite material under multi-level loads, and can accurately monitor the damage evolution of the woven ceramic matrix composite material under multi-level fatigue loads.
[0054] In one embodiment, a computer device is provided. The computer device may be a database, and its internal structure diagram may be as follows: Figure 3 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store pending transactions. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for monitoring the evolution of multi-level fatigue damage of a woven ceramic matrix composite material is implemented.
[0055] In one embodiment, a computer device is also provided, including a memory and a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps in the above-mentioned method for monitoring the evolution of multi-level fatigue damage of woven ceramic matrix composite materials are implemented.
[0056] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps in the above-mentioned method for monitoring the evolution of multi-stage fatigue damage of a woven ceramic matrix composite material are implemented.
[0057] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the steps in the above method for monitoring multi-level fatigue damage evolution of a woven ceramic matrix composite material.
[0058] It should be noted that the object information (including but not limited to object device information, object personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the object or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards.
[0059] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.
[0060] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0061] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.
Claims
1. A method for monitoring the evolution of multi-stage fatigue damage in a woven ceramic matrix composite material, characterized in that: The method for monitoring the evolution of multi-stage fatigue damage of a woven ceramic matrix composite material comprises: The fracture mechanics method is used to obtain the cycle-dependent interface debonding length of the first-level fatigue peak stress and the cycle-dependent interface debonding length of the second-level fatigue peak stress of the woven ceramic matrix composite material; Based on the interface slip mechanism and the cycle-dependent interface debonding length of the second-level fatigue peak stress, the cycle-dependent unloading interface reverse slip length of the second-level fatigue peak stress is determined by using the fracture mechanics method; Based on the cycle-dependent interface debonding length and unloading interface reverse slip length of the second-level fatigue peak stress, the shear lag model is used to analyze the fiber unloading axial stress distribution of the second-level fatigue peak stress, and the unloading strain of the braided ceramic matrix composite is obtained; Based on the interface slip mechanism and the cycle-dependent interface debonding length of the second-level fatigue peak stress, the fracture mechanics method is used to determine the cycle-dependent reloading interface new slip length of the second-level fatigue peak stress: ； in, is the new slip length of the reloaded interface for the cycle-dependent second-stage fatigue peak stress, is the second level fatigue peak stress, N is the number of cycles, is the second level fatigue peak stress The unloading interface sliding length at is the cycle-dependent interfacial shear stress, is the steady-state interface shear stress, is the cycle-dependent interfacial debonding length of the second-stage fatigue peak stress, is the interface debonding length of the first level fatigue peak stress, is the first level fatigue peak stress, is the fiber radius of the woven ceramic matrix composite, is the volume content of the matrix of the woven ceramic matrix composite, is the fiber volume content of the woven ceramic matrix composite, is the matrix elastic modulus of the woven ceramic matrix composite, is the fiber elastic modulus of the woven ceramic matrix composite, is the elastic modulus of the woven ceramic matrix composite, is the shear lag model parameter, is the interfacial debonding energy, To reload stress; Based on the cycle-dependent interface debonding length of the second-level fatigue peak stress, the shear lag model is used to analyze the fiber reloading axial stress distribution of the second-level fatigue peak stress, and the reloading strain of the braided ceramic matrix composite is obtained: ； in, The reloading strain of the woven ceramic matrix composite is is the second level fatigue peak stress The corresponding matrix crack spacing, To reload stress The new slip length of the interface at is the reverse slip length of the unloading interface, is the fiber axial stress in the interface bonding zone, is the axial stress of the matrix in the interface bonding area, is the matrix crack spacing, is the interface debonding ratio, is the thermal residual strain; Based on the cycle-dependent interface debonding length and unloading interface reverse slip length of the second-level fatigue peak stress, the inverse of the tangent modulus during unloading and reloading is calculated to determine the fatigue damage evolution of the woven ceramic matrix composite under multi-level loading: ； ； ； ； in, is the second level fatigue peak stress Unloading fatigue damage parameters, is the second level fatigue peak stress Reload fatigue damage parameters, is the second level fatigue peak stress Unloading strain difference, is the second level fatigue peak stress Reload strain difference, To unload stress The corresponding strain difference is, To reload stress The corresponding strain difference is, To unload stress, is the fatigue peak stress, The reverse slip length of the unloading interface for the cycle dependence of the second-level fatigue peak stress.
2. The method for monitoring the evolution of multi-stage fatigue damage of a woven ceramic matrix composite material according to claim 1, characterized in that: The cycle-dependent interfacial debonding length of the first-order fatigue peak stress is obtained using the following formula: ； in, is the cycle-dependent interfacial debonding length of the first-order fatigue peak stress.
3. The method for monitoring the evolution of multi-stage fatigue damage of a woven ceramic matrix composite material according to claim 1, characterized in that: The cycle-dependent interfacial debonding length of the second-stage fatigue peak stress is obtained using the following formula: 。 4. The method for monitoring multi-stage fatigue damage evolution of woven ceramic matrix composite materials according to claim 1, characterized in that: The cycle-dependent unloading interface reverse slip length of the second-stage fatigue peak stress is determined by the following formula: 。 5. The method for monitoring multi-stage fatigue damage evolution of woven ceramic matrix composite materials according to claim 1, characterized in that: The unloading strain of the woven ceramic matrix composite is obtained using the following formula: ； in, is the unloading strain of the woven ceramic matrix composite.
6. 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 method for monitoring the evolution of multi-stage fatigue damage of a woven ceramic matrix composite material as described in any one of claims 1 to 5.