Establishment method and establishment equipment of nondestructive testing acceptance criterion for composite material OGV and computer readable storage medium

Abstract

The invention relates to an establishment method and establishment equipment for a nondestructive testing acceptance criterion for a composite material OGV and a computer readable storage medium. The establishment method comprises the following steps: S1, determining structural partitions according to structural characteristics of the composite material OGV; s2, performing manufacturing defect statistics on the basis of the determined structure partitions, and determining defect types allowed by the structure partitions on the basis of a manufacturing defect statistics result; s3, defect information statistics is carried out based on the allowed defect types; s4, determining a part to be subjected to the test based on a defect information statistical result; s5, carrying out experimental verification; and S6, establishing an acceptance criterion. The invention provides an establishment method and establishment equipment for a nondestructive testing acceptance criterion of a composite material OGV and a computer readable storage medium. The nondestructive testing acceptance criterion can be established so as to accurately evaluate the internal quality of the composite material OGV.

Description

Technical Field

[0001] The present invention relates to the technical field of nondestructive testing of aircraft engines, and in particular to a method for establishing a nondestructive testing acceptance criterion for composite material OGVs, an establishing device and a computer-readable storage medium. Background Art

[0002] In order to improve the fuel economy and environmental friendliness of modern civil aviation engines, modern turbofan aircraft engines are developing in the direction of high bypass ratio, high thrust, low fuel consumption, low noise, high safety, and high reliability. The increase in bypass ratio means that fan components need to use larger parts, which makes the weight of the engine fan section account for a continuously increasing proportion of the total weight of the engine. Traditional metal materials can no longer meet the performance requirements of high bypass ratio turbofan engines, especially the outlet guide vanes (OGV), which have become key components in the process of engine weight reduction and efficiency improvement due to their large number and large weight. OGVs made of resin-based composite materials can achieve effective weight reduction, while improving the aeroelastic properties of the outer duct and improving engine performance.

[0003] my country has widely used composite materials in aircraft, and the technology has become mature. However, the research and development of engine resin-based composite OGV started late, and the foundation for non-destructive testing of composite OGV is also very weak, with almost no reference data. The structure of resin-based composite OGV is complex, divided into blade body, upper edge plate, lower edge plate, OGV metal edging. Compared with conventional composite parts, the overall structure is more complex, including not only variable thickness, variable curvature ply area, transition fillet filling area, but also composite material and metal bonding area. The existence of many features makes it impossible to perform effective full coverage detection with a single method. The existence of different structural features will lead to different types of internal defects in the processing and manufacturing process. How to form a reasonable defect acceptance criterion has become a key issue that needs to be solved in non-destructive testing. Summary of the invention

[0004] In view of the above problems in the prior art, the present invention proposes a method, an establishment device and a computer-readable storage medium for establishing non-destructive testing acceptance criteria for composite material OGV, which can establish non-destructive acceptance criteria to accurately evaluate the internal quality of composite material OGV.

[0005] Specifically, the present invention proposes a method for establishing non-destructive testing acceptance criteria for composite material OGV, comprising the steps of:

[0006] S1, determine the structural partition according to the structural characteristics of the composite material OGV;

[0007] S2, conducting manufacturing defect statistics based on the determined structural partitions, and determining the defect types allowed for each structural partition based on the manufacturing defect statistics results;

[0008] S3, conduct defect information statistics based on the allowed defect types;

[0009] S4, determine the parts to be tested based on the statistical results of defect information;

[0010] S5, conduct test verification;

[0011] S6. Establish acceptance criteria.

[0012] According to one embodiment of the present invention, the structural partition includes four areas, namely, the blade body, the upper edge plate, the lower edge plate and the leading edge metal reinforcement edge.

[0013] According to an embodiment of the present invention, in step S2, if the occurrence probability of different defect types in each of the structural partitions is greater than the set allowable occurrence probability, the defect type is used as the defect type allowed in the corresponding structural partition.

[0014] According to an embodiment of the present invention, in step S3, the defect size and defect position corresponding to the allowed defect type are recorded.

[0015] According to one embodiment of the present invention, the defect size includes defect length and width, diameter or porosity.

[0016] According to an embodiment of the present invention, in step S4, when determining the part to be tested, a single variable should be controlled.

[0017] According to one embodiment of the present invention, the test verification process includes:

[0018] A static strength test is first carried out. If N1 test pieces pass the static strength test, a vibration fatigue test is then carried out. If N2 test pieces pass the vibration fatigue test, the test verification is determined to have passed.

[0019] According to one embodiment of the present invention, N1≥3, N2≥3, and N1 and N2 are integers.

[0020] According to one embodiment of the present invention, in step S6, acceptance criteria are established based on the defect types and defect sizes of different regions of the composite material OGV determined in step S5.

[0021] The present invention also provides a device for establishing non-destructive testing acceptance criteria for composite material OGVs, comprising a memory, 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 of the method for establishing non-destructive testing acceptance criteria for composite material OGVs as described in any of the aforementioned items are implemented.

[0022] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps of the method for establishing acceptance criteria for non-destructive testing of composite material OGV as described in any of the above items are implemented.

[0023] The present invention provides a method for establishing nondestructive testing acceptance criteria for composite material OGV, an establishment device and a computer-readable storage medium. The structural partitions are determined according to the structural characteristics of the composite material OGV, and manufacturing defect statistics are carried out based on the structural partitions. Then, the defect types are determined, and defect information statistics are carried out. Acceptance criteria are established through experimental verification. The established nondestructive acceptance criteria can accurately evaluate the internal quality of the composite material OGV.

[0024] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are included to provide further explanation of the present invention, and are incorporated into and constitute a part of this application. The accompanying drawings illustrate embodiments of the present invention and together with the description serve to explain the principle of the present invention.

[0026] In the attached figure:

[0027] Figure 1 A flowchart of a method for establishing non-destructive testing acceptance criteria for composite material OGV according to an embodiment of the present invention is shown.

[0028] Figure 2 A schematic diagram of the structural partitioning of a composite material OGV according to an embodiment of the present invention is shown.

[0029] Figure 3A Schematic diagram showing a single defect of a composite material OGV according to an embodiment of the present invention Figure 1 .

[0030] Figure 3B Schematic diagram showing multiple defects of a composite material OGV according to an embodiment of the present invention Figure 2 .

[0031] Figure 4A A schematic diagram showing slightly dense pores on the surface of a composite material OGV according to an embodiment of the present invention.

[0032] Figure 4B A schematic diagram showing moderately dense pores on the surface of a composite material OGV according to an embodiment of the present invention.

[0033] Figure 4C A schematic diagram showing heavily dense pores on the surface of a composite material OGV according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments 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, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0037] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0038] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0039] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0040] Figure 1 A flowchart of a method for establishing a non-destructive testing acceptance criterion for composite material OGV according to an embodiment of the present invention is shown. As shown in the figure, a method for establishing a non-destructive testing acceptance criterion for composite material OGV applicable to aircraft engines comprises the following steps:

[0041] S1, determine the structural partition according to the structural characteristics of the composite material OGV;

[0042] S2, conducting manufacturing defect statistics based on the determined structural partitions, and determining the defect types allowed for each structural partition based on the manufacturing defect statistics results;

[0043] S3, conduct defect information statistics based on the allowed defect types;

[0044] S4, determine the parts to be tested based on the statistical results of defect information;

[0045] S5, conduct test verification;

[0046] S6. Establish acceptance criteria.

[0047] Figure 2 The schematic diagram of the structural partition of the composite material OGV of one embodiment of the present invention is shown. As shown in the figure, preferably, the structural partition is determined to be 4 according to the structural characteristics of the composite material OGV, namely the blade body, the upper edge plate, the lower edge plate and the leading edge metal reinforcement edge.

[0048] Preferably, in step S2, if the occurrence probability of different defect types in each structural partition is greater than the set allowable occurrence probability, then the defect type is used as the defect type allowed in the corresponding structural partition. Specifically, in one embodiment, the result of conducting manufacturing defect statistics for each structural partition is:

[0049] Blade body: defects include dense holes, wrinkles, pits, poor glue, rich glue, and delamination on the surface, among which wrinkles, pits, poor glue, and rich glue are less likely to appear;

[0050] Upper edge plate: defects include pores, air holes, delamination, and wrinkles, among which delamination and wrinkles are less likely to occur;

[0051] Lower edge plate: defects include pores, air holes, delamination, and wrinkles, among which delamination and wrinkles are less likely to occur;

[0052] Leading edge metal reinforcement: Defects include debonding and pores, among which pores are less likely to occur.

[0053] The allowed probability of defects in each structural partition is set to exclude defects with a low probability of occurrence. Because defects with a low probability of occurrence can be eliminated through product / part manufacturing process control, such defects are not allowed to exist. Therefore, the allowed defect types for each structural partition are determined as follows:

[0054] Blade body: dense holes and layers on the surface;

[0055] Upper edge plate: pores, pores;

[0056] Lower edge plate: pores, pores;

[0057] Leading edge metal reinforcement: debonding.

[0058] Preferably, in step S3, the defect size and defect position corresponding to the allowed defect type are recorded. More preferably, the defect size includes defect length and width, diameter or porosity. Figure 3A Schematic diagram showing a single defect of a composite material OGV according to an embodiment of the present invention Figure 1 As shown in the figure, Y is the maximum projection width of the defect delamination, porosity or debonding. X is the defect projection length perpendicular to the Y direction, which is the defect width Y and length X recorded in the defect size. Figure 3B Schematic diagram showing multiple defects of a composite material OGV according to an embodiment of the present invention Figure 2. As shown in the figure, when two or more scattered defects are very close, the defect center line is determined according to the maximum sensitivity of the defect measuring instrument, and the center lines of the two defects are connected. The distance K between the connecting lines is the defect dispersion distance. It can be defined that defects with a dispersion distance K less than the Z value are counted as the same defect, and defects with a dispersion distance K greater than the Z value are counted as a single defect. Wherein, Z = (X+Y) / 2. For porosity defects, record the porosity %. The defect size can also include defined defect levels, such as heavily dense holes, moderately dense holes, or slightly dense holes. Table 1 is a statistical table of defect information for each structural partition.

[0059] Table 1 Defect information statistics

[0060]

[0061]

[0062] Preferably, in step S4, the parts (composite material OGV) to be tested are determined from the parts for which defect information statistics have been performed, and a single variable should be controlled. Controlling a single variable means that the defects mainly exist in the structural partition to be tested. For example, when verifying the surface dense hole defect limit of the blade body, it is necessary to ensure that other types of defects do not exist in the remaining structural partitions as much as possible. When the manufacturing process cannot guarantee the above conditions, it should be carefully analyzed after the test whether the failure area is the test area.

[0063] Preferably, in step S5, carrying out the test verification process includes:

[0064] First, conduct a static strength test. If the N1 test piece passes the static strength test, conduct a vibration fatigue test. If the N2 test piece passes the vibration fatigue test, the test verification is determined to have passed. Since the OGV operating conditions of different engines are different, the corresponding criteria for passing the strength test and vibration fatigue test are also different, and are determined according to the operating conditions of the OGV.

[0065] Preferably, N1≥3, N2≥3, and N1 and N2 are integers. Preferably, N1=N2=3, that is, if three test pieces pass the static strength test, the vibration fatigue test is carried out, and if three test pieces pass the vibration fatigue test, the test piece is determined to have passed the test verification.

[0066] Preferably, in step S6, acceptance criteria are established based on the defect types and defect sizes of different regions of the composite material OGV determined in step S5. Figure 4A A schematic diagram showing slightly dense pores on the surface of a composite material OGV according to an embodiment of the present invention. Figure 4B A schematic diagram showing moderately dense pores on the surface of a composite material OGV according to an embodiment of the present invention. Figure 4CA schematic diagram of the surface heavy dense holes of a composite material OGV according to an embodiment of the present invention is shown. In one embodiment, the acceptance criteria are established as follows:

[0067] Blade body: Surface dense hole defects not exceeding moderate (reference Figure 4B ), delamination defects with a diameter not exceeding Φ6mm are allowed;

[0068] Upper edge plate: Porosity less than 1.7% and pore defects with a diameter not greater than Φ6mm are allowed; Lower edge plate: Porosity less than 1.7% and pore defects with a diameter not greater than Φ6mm are allowed; Front edge metal reinforcement: The bonding surface is allowed to have a debonding defect of less than 15%.

[0069] The nondestructive testing acceptance criteria for composite material OGV established by the establishment method provided by the present invention can accurately evaluate the internal quality of the composite material OGV, avoid overly strict acceptance criteria, which leads to a lower part qualification rate and waste of costs; and avoid overly loose acceptance criteria, which leads to possible use risks of parts.

[0070] The present invention also provides a device for establishing non-destructive testing acceptance criteria for composite material OGVs, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of any of the aforementioned methods for establishing non-destructive testing acceptance criteria for composite material OGVs are implemented.

[0071] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the aforementioned methods for establishing non-destructive testing acceptance criteria for composite material OGVs.

[0072] Among them, the specific implementation methods and technical effects of the device for establishing non-destructive testing acceptance criteria for composite material OGV and the computer-readable storage medium can all be referred to the embodiment of the method for establishing non-destructive testing acceptance criteria for composite material OGV provided by the above-mentioned present invention, and will not be repeated here.

[0073] Those skilled in the art will further appreciate that the various illustrative logic blocks, modules, circuits, and algorithm steps described in conjunction with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or a combination of the two. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. The technician may implement the described functionality in different ways for each specific application, but such implementation decisions should not be interpreted as resulting in a departure from the scope of the present invention.

[0074] The various illustrative logic modules and circuits described in conjunction with the embodiments disclosed herein may be implemented or executed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in cooperation with a DSP core, or any other such configuration.

[0075] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software module may reside in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor so that the processor can read and write information from / to the storage medium. In an alternative, a storage medium may be integrated into a processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In an alternative, the processor and the storage medium may reside in a user terminal as discrete components.

[0076] In one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented as a computer program product in software, each function may be stored on or transmitted by a computer-readable medium as one or more instructions or codes. Computer-readable media include both computer storage media and communication media, including any medium that facilitates the transfer of a computer program from one place to another. Storage media may be any available medium that can be accessed by a computer. As an example and not limitation, such a computer-readable medium may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of an instruction or data structure and can be accessed by a computer. Any connection is also properly referred to as a computer-readable medium. For example, if the software is transmitted from a website, a server, or other remote source using a coaxial cable, a fiber optic cable, a twisted pair, a digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwaves, the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwaves are included in the definition of the medium. Disk and disc as used herein include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, wherein disk often reproduces data magnetically, while disc reproduces data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0077] It will be apparent to those skilled in the art that various modifications and variations may be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention covers modifications and variations of the present invention that fall within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A method for establishing non-destructive testing acceptance criteria for composite material OGV, comprising the steps of: S1, determine the structural partition according to the structural characteristics of the composite material OGV; S2, conducting manufacturing defect statistics based on the determined structural partitions, and determining the defect types allowed for each structural partition based on the manufacturing defect statistics results; S3, conduct defect information statistics based on the allowed defect types; S4, determine the parts to be tested based on the statistical results of defect information; S5, conduct test verification; S6. Establish acceptance criteria.

2. The method for establishing acceptance criteria for non-destructive testing of composite material OGV as claimed in claim 1, It is characterized in that The structural partition includes four areas, namely, the blade body, the upper edge plate, the lower edge plate and the leading edge metal reinforcement edge.

3. The method for establishing acceptance criteria for non-destructive testing of composite material OGV as claimed in claim 1, It is characterized in that In step S2, if the occurrence probability of different defect types in each of the structural partitions is greater than the set allowable occurrence probability, the defect type is used as the allowable defect type for the corresponding structural partition.

4. The method for establishing acceptance criteria for non-destructive testing of composite material OGV as claimed in claim 1, It is characterized in that In step S3, the defect size and defect position corresponding to the allowed defect type are recorded.

5. The method for establishing acceptance criteria for non-destructive testing of composite material OGV as claimed in claim 4, It is characterized in that The defect size includes defect length and width, diameter or porosity.

6. The method for establishing acceptance criteria for non-destructive testing of composite material OGV as claimed in claim 1, It is characterized in that In step S4, when determining the parts to be tested, a single variable should be controlled.

7. The method for establishing acceptance criteria for non-destructive testing of composite material OGV as claimed in claim 1, It is characterized in that In step S5, the test verification process includes: A static strength test is first carried out. If N1 test pieces pass the static strength test, a vibration fatigue test is then carried out. If N2 test pieces pass the vibration fatigue test, the test verification is determined to have passed.

8. The method for establishing acceptance criteria for non-destructive testing of composite material OGV as claimed in claim 7, It is characterized in that N1≥3, N2≥3, and N1 and N2 are integers.

9. The method for establishing acceptance criteria for non-destructive testing of composite material OGV as claimed in claim 7, It is characterized in that In step S6, acceptance criteria are established based on the defect types and defect sizes of different regions of the composite material OGV determined in step S5.

10. A device for establishing acceptance criteria for non-destructive testing of composite material OGVs, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, It is characterized in that When the processor executes the computer program, the processor implements the steps of the method for establishing non-destructive testing acceptance criteria for composite material OGV according to any one of claims 1 to 9.

11. A computer-readable storage medium having a computer program stored thereon, It is characterized in that When the computer program is executed by a processor, the steps of the method for establishing non-destructive testing acceptance criteria for composite material OGVs according to any one of claims 1 to 9 are implemented.

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