Method, device and equipment for testing interlayer fracture toughness of part and storage medium

Abstract

The invention discloses a part interlayer fracture toughness test method, device and equipment and a storage medium, and the method comprises the steps: applying different loading forces to a standard test part based on a mechanical test system, and obtaining test data of each test point at different test moments through a digital image correlation technology DIC; performing top-hat transformation processing on the test image of each test point to obtain a processed test image, and obtaining the size of the precrack according to the processed test image; and calculating according to the precrack size and the loading force of each test point at different test moments to obtain the interlayer fracture toughness of the standard test part. The method comprises the following steps: on the basis of acquiring crack opening displacement and angle of a fiber reinforced composite material I-type interlayer fracture toughness test piece through DIC, synchronizing the dynamic change process of the length of a prefabricated crack extending along with loading of a load at different moments with a real-time load, and meanwhile, optimizing an acquired test image by combining a Top-hat technology, so as to obtain a test result of the I-type interlayer fracture toughness of the fiber reinforced composite material I-type interlayer fracture toughness of the fiber reinforced composite material I-type interlayer fracture toughness test piece. And the measurement precision of the interlayer fracture toughness is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of data processing, and in particular to a part interlaminar fracture toughness testing method, device, equipment and storage medium. BACKGROUND

[0002] I-type interlaminar fracture toughness is generally used to characterize the interlaminar tensile delamination capacity of composite materials, and is an important input parameter for the study of composite material delamination propagation and failure mechanism. At present, the crack propagation length and load-displacement response curve can be obtained by experiment to obtain the fracture toughness value.

[0003] The I-type crack propagation of fiber-reinforced composite materials theoretically includes two modes, namely stable propagation and unstable propagation. Generally, the crack length of unstable propagation presents a stepwise increase. In order to ensure real-time correspondence with load and displacement, researchers usually stop the test in the middle when crack propagation occurs each time in the traditional measurement method, and then measure the crack length at this moment with the naked eye. Although this method can meet the measurement requirements, it will have a potential impact on the propagation of crack stable propagation, thereby causing measurement errors. On the other hand, the crack length of stable propagation presents a steady and slow growth, that is, the crack length changes all the time. If the traditional test method and recording method are still used, not only will the crack propagation process be disturbed, but also the measurement requirements of the crack length changing all the time cannot be met, which puts higher requirements on the test recording process. SUMMARY

[0004] The present application provides a part interlaminar fracture toughness testing method to accurately measure the interlaminar fracture toughness of the part.

[0005] According to a first aspect of the present application, a part interlaminar fracture toughness testing method is provided, comprising: obtaining a standard test part marked with a speckle, wherein the test part is a fiber-reinforced composite material including a pre-crack;

[0006] Applying different load forces to the standard test part based on a mechanical testing system, and obtaining test data of each test point at different test times by digital image correlation technology DIC, wherein the test data includes test images and load forces;

[0007] Performing top-hat transformation processing on the test images of each test point to obtain processed test images, and obtaining a pre-crack size according to the processed test images;

[0008] According to the pre-crack size and the load force of each test point at different test times, the interlaminar fracture toughness of the standard test part is calculated.

[0009] According to another aspect of the present application, there is provided an interlaminar fracture toughness testing device for a part, comprising:

[0010] a standard testing part acquisition module configured to acquire a standard testing part marked with speckles, wherein the testing part is a fiber-reinforced composite material including a pre-existing crack;

[0011] a testing data acquisition module configured to acquire testing data of each testing point at different testing times by using a digital image correlation (DIC) technique based on the application of different load forces on the standard testing part by a mechanical testing system, wherein the testing data includes testing images and load forces;

[0012] a pre-existing crack size acquisition module configured to perform top-hat transformation processing on the testing images of each testing point to obtain processed testing images, and to acquire pre-existing crack sizes according to the processed testing images;

[0013] an interlaminar fracture toughness calculation module configured to calculate the pre-existing crack sizes of each testing point at different testing times and the load forces to obtain the interlaminar fracture toughness of the standard testing part.

[0014] According to another aspect of the present application, there is provided an electronic device, comprising:

[0015] at least one processor; and

[0016] a memory communicatively connected to the at least one processor; wherein

[0017] the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to perform the method according to any one of the embodiments of the present application.

[0018] According to another aspect of the present application, there is provided a computer readable storage medium storing computer instructions for enabling a processor to implement the method according to any one of the embodiments of the present application when executed by the processor.

[0019] The technical solution of the embodiments of the present application acquires the crack opening displacement and angle of the I-type interlaminar fracture toughness testing piece of the fiber-reinforced composite material by using the DIC technique, synchronizes the dynamic change process of the length of the pre-existing crack at different times with the real-time load, and optimizes the collected testing images by using the Top-hat technique, thereby effectively reducing the influence of factors that may cause inaccurate crack identification, such as the relatively small number of speckle points in the DIC measurement of the slender structure and the bridging of the crack tip by the adhesive film.

[0020] It is to be understood that the details set forth herein do not limit the scope of the embodiments of the application to the specific embodiments described. Rather, the scope of the embodiments of the application is to be defined by the appended claims. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0022] Figure 1 is a flow chart of a part interlayer fracture toughness test method according to the first embodiment of the present application;

[0023] Figure 2 is a schematic diagram of a standard test part mechanism according to the first embodiment of the present application;

[0024] Figure 3 is a schematic diagram of a mechanical test system structure according to the first embodiment of the present application;

[0025] Figure 4 is a flow chart of a part interlayer fracture toughness test method according to the second embodiment of the present application;

[0026] Figure 5 is a schematic diagram of a part interlayer fracture toughness test device according to the third embodiment of the present application;

[0027] Figure 6 is a schematic diagram of an electronic device according to the fourth embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the technical personnel in the art better understand the present application scheme, the following will combine the drawings in the embodiments of the present application, and the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only some embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0029] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] Example 1

[0031] Figure 1 A flowchart of a method for testing interlaminar fracture toughness of a part is provided for the first embodiment of the present invention. This embodiment is applicable to the case of testing the fracture toughness of a part. The method can be performed by a device for testing interlaminar fracture toughness of a part, which can be implemented in the form of hardware and / or software. Figure 1 As shown, the method includes:

[0032] Step S101: obtaining a standard test part marked with speckles.

[0033] Optionally, a standard test part marked with speckles is obtained, including: manufacturing an original test piece for a fiber reinforced composite material mode I interlaminar fracture toughness test according to process specifications and test standards; spraying a layer of white paint on the side of the original test piece, and randomly marking black speckles on the side to obtain a standard test part.

[0034] Specifically, the standard test part is a fiber-reinforced composite material including prefabricated cracks. In this embodiment, the fiber-reinforced composite material is mainly subjected to a Type I interlaminar fracture toughness test, and the standard test part is specifically glued. This embodiment will carry out preparatory work before the test, specifically the preparation of standard test parts. In this embodiment, the original test piece will be manufactured with reference to the process specifications and test standards. After the original test piece is prepared, a layer of white paint will be evenly sprayed on the side of the prepared original test piece, that is, in the direction perpendicular to the bonding surface. According to the size of the field of view and the resolution of the image acquisition device, for example, the charge coupled device (CCD) camera, different specifications of molds are selected to complete the coating of black spot speckles to obtain standard test parts, and the black speckles can be sprayed in a uniformly distributed manner. The user can determine the example between different speckles based on the actual size of the standard test part, which is not limited in this embodiment. For example Figure 2As shown in the schematic diagram of the mechanism of the acquired standard test part, as shown in the figure Figure 2 As shown, the standard test part is a fiber-reinforced composite material connected by glue at one end, and the other end of the test part is an open prefabricated crack.

[0035] It should be noted that the reason why the speckle is sprayed on the standard test part in the embodiment is that the digital image correlation technology (DIC) is applied in the test process. The DIC technology obtains the displacement and strain of a pixel point by tracking the position change of the pixel point before and after the deformation of the object surface. Since the DIC technology does not need to finely mark the scale of the test piece, and more effective data can be obtained during post-processing, the application of the DIC technology in experimental mechanics testing is more and more.

[0036] In step S102, different load forces are applied to the standard test part based on the mechanical testing system, and the test data of each test point at different test times is obtained by the digital image correlation technology DIC.

[0037] Optionally, based on the mechanical testing system, different load forces are applied to the standard test part, and the test data of each test point at different test times is obtained by the digital image correlation technology DIC, including: installing the standard test part on the mechanical testing machine, and jointly debugging the light source and the image acquisition device; starting the test of the debugged mechanical testing system, and continuously increasing the size of the load force in the test process by the mechanical testing machine; based on the DIC, the test images containing different expansion progress of the prefabricated crack are collected for each test point by the image acquisition device.

[0038] Specifically, as shown in the figure Figure 3 As shown in the schematic diagram of the structure of the mechanical testing system, the mechanical testing system includes a mechanical testing machine, a light source, and a digital image acquisition device. The light source can be an LED lamp, and the image acquisition device can be a CCD camera. Of course, the embodiment is only an example and does not limit the specific types of the light source and the digital image acquisition device. The standard test part marked with speckles is installed on the mechanical testing system. Specifically, the end of the standard test part not glued is fixed by the clamping piece by using the mechanical testing machine, as shown in the figure Figure 2The upper and lower parts of the part shown as the end of the prefabricated crack are glued and clamped, and the light source test system and the image acquisition device are jointly debugged. The light intensity of the light source is mainly adjusted to achieve the best test light intensity. In addition, the digital image acquisition device is focused to capture the clearest test image. When the preparation work is completed and the mechanical test system receives the start instruction, the mechanical testing machine will continuously increase the load force applied to the standard test part by the clamping part to continuously increase the size of the prefabricated crack.

[0039] In this embodiment, different test points are selected on the standard test part, and for each test point, the test image of the prefabricated crack at different expansion stages is captured by the image acquisition device based on the DIC technology, and the load force applied by the mechanical testing machine at different test times is recorded by the mechanical testing system. Because the speckle is marked on the standard test part, when testing based on DIC, the position change of the same pixel point in the speckle image before and after the deformation of the standard part surface is tracked to obtain the displacement and strain of the pixel point. Physical information, without the need for fine size marking of the standard test part.

[0040] It should be noted that in the process of testing the standard test part based on the DIC technology in this embodiment, the prefabricated crack does not interrupt during expansion, and the image acquisition device is used to capture synchronously during the process of continuously applying load force, so that for unstable expansion, it does not have potential influence on the propagation of the prefabricated crack, and for stable expansion, it does not interfere with the propagation process of the prefabricated crack, thereby meeting the measurement requirement of the length of the prefabricated crack changing over time.

[0041] Step S103, performing top-hat transformation processing on the test image of each test point to obtain a processed test image, and obtaining the prefabricated crack size according to the processed test image.

[0042] Optionally, the test image of each test point is processed by top-hat transformation to obtain a processed test image, including: identifying the prefabricated crack of the standard test part for each test point; using top-hat transformation to eliminate the glue film bridge error on the prefabricated crack to obtain the processed test image.

[0043] Optionally, the prefabricated crack size is obtained according to the processed test image, including: identifying the prefabricated crack in the processed test image; and measuring the identified prefabricated crack to obtain the prefabricated crack size.

[0044] Specifically, after the test is completed, this embodiment acquires test data for each test point at different test times. The test data includes the test image and load force, specifically the correspondence between the test time, load force, and test image. Since film bridging may occur at the prefabricated crack tip during the test process—that is, the crack size increases but the film appears to be stringy—if stringing occurs at the crack site in the test image due to film bridging, it will affect the accurate measurement of the prefabricated crack size. Therefore, after acquiring the test image, this embodiment performs a top-hat transformation on the test image. Specifically, the prefabricated crack of the standard test part in the test image is identified, and then a top-hat transformation is used to eliminate the film bridging error at the prefabricated crack to obtain the processed test image. Top-hat image processing technology is a type of image morphology processing method, typically used to optimize the contrast of grayscale or binary images and sharpen image abruptness. It can achieve good background suppression in complex and changing background environments. Therefore, in this embodiment, by performing top-hat transformation on the test image, the influence of factors that may cause inaccurate crack identification, such as relatively few scattered speckles in DIC measurement of slender structures and film bridging at crack tips, can be effectively reduced.

[0045] Among them, in this embodiment, after obtaining the processed test image, the prefabricated cracks in the test image will be identified, and the identified prefabricated cracks will be measured to obtain the prefabricated crack size. Since there is no film drawing phenomenon in the prefabricated cracks in the processed test image, there is no interference from noise information when measuring the identified prefabricated cracks, and a more accurate prefabricated crack size can be obtained.

[0046] Step S104 , calculating based on the prefabricated crack size and load force at each test point at different test times to obtain the interlaminar fracture toughness of the standard test part.

[0047] Optionally, the interlaminar fracture toughness of the standard test part is obtained by calculation based on the prefabricated crack size and load force of each test point at different test times, including: determining the debonding-resistance curve by calculation based on the prefabricated crack size and load force of each test point; and determining the interlaminar fracture toughness of the standard test part based on the debonding-resistance curve.

[0048] Specifically, after the size of the pre-crack contained in each test image is obtained in the embodiment, since each test image corresponds to a shooting time and the load pressure at each test time is recorded in the mechanical testing system, the relationship between the test time, the load pressure and the pre-crack size of each test point can be determined. In the embodiment, the debonding-resistance curve can be determined based on the above correspondence, and the interlaminar fracture toughness of the standard test part can be obtained by analyzing the debonding-resistance curve. Since the determination of the interlaminar fracture toughness based on the debonding-resistance curve is not the focus of the present application, the embodiment will not be described again. The focus of the embodiment is the coupling of DIC and Top-hat technology, the accurate pre-crack size is obtained by processing the collected test data, and the accurate interlaminar fracture toughness is obtained based on the obtained pre-crack size.

[0049] In the embodiment, the dynamic change process of the length of the pre-crack expanded with the load at different times is synchronized with the real-time load, and the collected test image is optimized by combining the Top-hat digital image processing technology, thereby effectively reducing the influence of factors that may cause inaccurate crack identification, such as fewer speckle points in the slender structure DIC measurement and crack tip film bridging.

[0050] Embodiment two

[0051] Figure 4 The embodiment two of the present application provides a flowchart of the interlaminar fracture toughness test method of the part. Based on the above embodiment, after the pre-crack size is obtained according to the processed test image, the embodiment further includes: verifying the pre-crack size. As shown in Figure 4 The method includes:

[0052] In step S201, a standard test part marked with speckles is obtained.

[0053] Optionally, the standard test part marked with speckles is obtained, including: manufacturing an original test part for the interlaminar fracture toughness test of the fiber-reinforced composite I type according to the process specification and the test standard; spraying a layer of white paint on the side of the original test part, and randomly marking black speckles on the side to obtain the standard test part.

[0054] In step S202, different load forces are applied to the standard test part based on the mechanical testing system, and the test data of each test point at different test times is obtained by the digital image correlation technology DIC.

[0055] Optionally, the mechanical testing system applies different load forces to the standard test part, and the test data of each test point at different test times is obtained through the digital image correlation technology DIC, including: installing the standard test part on the mechanical testing machine, and jointly debugging the light source and the image acquisition device; starting the test of the debugged mechanical testing system, and continuously increasing the size of the load force in the test process through the mechanical testing machine; and collecting test images containing different expansion progress of the prefabricated crack for each test point through the image acquisition device based on DIC.

[0056] In step S203, the test images of each test point are subjected to top-hat transformation processing to obtain processed test images, and the prefabricated crack size is obtained according to the processed test images.

[0057] Optionally, the test images of each test point are subjected to top-hat transformation processing to obtain processed test images, including: identifying the prefabricated crack of the standard test part for the test images of each test point; and eliminating the adhesive film bridging error on the prefabricated crack by using top-hat transformation to obtain the processed test images.

[0058] Optionally, the prefabricated crack size is obtained according to the processed test images, including: identifying the prefabricated crack in the processed test images; and measuring the identified prefabricated crack to obtain the prefabricated crack size.

[0059] In step S204, the prefabricated crack is verified.

[0060] Specifically, after the test images are processed and the prefabricated crack size is obtained in the embodiment, the obtained prefabricated crack size is verified, specifically, the case that the prefabricated crack size is obviously wrong is detected, for example, the obtained prefabricated crack size is significantly larger than the size of the standard test part, or the prefabricated crack size appears random code, etc., and when the above cases occur, a prompt information of prefabricated crack verification failure is generated. The reason for the above verification failure may be top-hat transformation processing error or prefabricated crack identification error, etc., which is not limited in the embodiment. In addition, when it is detected that the prefabricated crack size has no obvious error, a prompt information of prefabricated crack verification success is generated.

[0061] It should be noted that the prompt information obtained through verification is displayed in a specified manner in the embodiment, for example, in the form of an image or in the form of a voice, and the specific display manner of the prompt information is not limited in the embodiment, as long as it can prompt the user, which is within the protection scope of the application, and is not limited in the embodiment.

[0062] In step S205, the interlaminar fracture toughness of the standard test part is obtained by calculation according to the pre-crack size and the load force of each test point at different test times.

[0063] Optionally, the interlaminar fracture toughness of the standard test part is obtained by calculation according to the pre-crack size and the load force of each test point at different test times, including: determining the debonding-resistance curve by calculation according to the pre-crack size and the load force of each test point; and determining the interlaminar fracture toughness of the standard test part according to the debonding-resistance curve.

[0064] In the embodiments of the present application, on the basis of obtaining the crack opening displacement and angle of the I-type interlaminar fracture toughness test piece of the fiber-reinforced composite material by using the digital image correlation technology DIC, the dynamic change process of the pre-crack length at different times with the load expansion is synchronized with the real-time load, and the collected test images are optimized by combining the Top-hat transformation digital image processing technology Top-hat, so as to effectively reduce the influence of factors that may cause inaccurate crack identification, such as relatively few speckle points in the slender structure DIC measurement and crack tip film bridging.

[0065] Embodiment three

[0066] Figure 5 The embodiment three of the present application provides a structural schematic diagram of a part interlaminar fracture toughness testing device. As shown in the figure, Figure 5 The device includes a standard test part acquisition module 310, a test data acquisition module 320, a pre-crack size acquisition module 330, and an interlaminar fracture toughness calculation module 340.

[0067] The standard test part acquisition module 310 is configured to acquire a standard test part marked with speckles, wherein the test part is a fiber-reinforced composite material including a pre-crack.

[0068] The test data acquisition module 320 is configured to apply different load forces to the standard test part based on a mechanical testing system, and acquire test data of each test point at different test times by using the digital image correlation technology DIC, wherein the test data includes test images and load forces.

[0069] The pre-crack size acquisition module 330 is configured to perform Top-hat transformation processing on the test images of each test point to obtain processed test images, and acquire the pre-crack size according to the processed test images.

[0070] The interlaminar fracture toughness calculation module 340 is configured to acquire the interlaminar fracture toughness of the standard test part by calculation according to the pre-crack size and the load force of each test point at different test times.

[0071] Optionally, the test data acquisition module is configured to manufacture the original test piece for the interlaminar fracture toughness test of the fiber-reinforced composite I-type according to the process specification and the test standard.

[0072] The white paint is sprayed on the side of the original test piece, and the black speckles are randomly marked on the side to obtain the standard test part.

[0073] Optionally, the mechanical testing system comprises a mechanical testing machine, a light source and a digital image acquisition device.

[0074] Optionally, the test data acquisition module is configured to install the standard test part on the mechanical testing machine and jointly debug the light source and the image acquisition device.

[0075] The mechanical testing system is started after the debugging is completed, and the load force is continuously increased during the test process.

[0076] The test images containing different expansion progress of the prefabricated cracks are acquired by the image acquisition device based on the DIC.

[0077] Optionally, the prefabricated crack size acquisition module comprises a top-hat transformation processing unit configured to identify the prefabricated cracks of the standard test part for the test images of the test points.

[0078] The top-hat transformation is adopted to eliminate the adhesive film bridging error on the prefabricated cracks to obtain the processed test images.

[0079] Optionally, the prefabricated crack size acquisition module comprises a prefabricated crack size acquisition unit configured to identify the prefabricated cracks in the processed test images.

[0080] The prefabricated crack size is obtained by measuring the identified prefabricated cracks.

[0081] Optionally, the interlaminar fracture toughness calculation module is configured to calculate and determine the debonding-resistance curve according to the prefabricated crack size of the test points and the load force.

[0082] The interlaminar fracture toughness of the standard test part is determined according to the debonding-resistance curve.

[0083] The interlaminar fracture toughness test device of the part provided by the embodiment of the application can execute the interlaminar fracture toughness test method of the part provided by any embodiment of the application, and has the corresponding function modules and beneficial effects of the execution method.

[0084] Embodiment four

[0085] Figure 6A structural diagram of an electronic device 10 that can be used to implement embodiments of the present application is shown. The electronic device is intended to represent various forms of digital computers, such as laptops, desktops, tablets, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device can also represent various forms of mobile devices, such as personal digital assistants, cellular telephones, smartphones, wearable devices (e.g., headsets, glasses, watches, etc.), and other similar computing devices. The components shown here, their connections and relationships, and their functions, are meant to be examples only, and are not meant to limit implementations of the present application described and / or claimed in this document.

[0086] As shown Figure 6 The electronic device 10 includes at least one processor 11, and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., connected to the at least one processor 11 in communication, where the memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer programs stored in the read-only memory (ROM) 12 or loaded into the random access memory (RAM) 13 from the storage unit 18. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0087] Various components in the electronic device 10 are connected to the I / O interface 15, including an input unit 16, such as a keyboard, a mouse, etc., an output unit 17, such as various types of displays, speakers, etc., a storage unit 18, such as a magnetic disk, an optical disk, etc., and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network, such as the Internet, and / or various telecommunication networks.

[0088] The processor 11 can be various general and / or special purpose processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 performs various methods and processes described above, such as the interlaminar fracture toughness testing method of a part.

[0089] In some embodiments, the interlaminar fracture toughness testing method of a part can be implemented as a computer program tangibly embodied in a computer readable storage medium, e.g., storage unit 18. In some embodiments, some or all of the computer program can be loaded and / or installed onto electronic device 10 via, e.g., ROM 12 and / or communication unit 19. When the computer program is loaded onto RAM 13 and executed by processor 11, one or more of the steps of the interlaminar fracture toughness testing method of a part described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to perform the interlaminar fracture toughness testing method of a part by way of other any suitable means, e.g., by way of firmware.

[0090] Various implementations of the systems and techniques described above can be realized in digital electronic circuitry, integrated circuitry, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on a chip (SOC), a programmable logic device (PLD), a computer hardware, firmware, software, and / or combinations thereof. These various implementations can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0091] Computer programs used to implement the methods of the present application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the computer program, when executed, implements the functions / acts specified in the flowcharts and / or block diagrams. The computer program can be executed entirely on a machine, partially on a machine and partially on a remote machine or entirely on a remote machine or server.

[0092] In the context of the present application, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer-readable storage medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium can be a machine-readable signal medium. More specific examples of a machine-readable storage medium will include one or more lines of a program of instructions in a transitory signal, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0093] To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the electronic device. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0094] The systems and techniques described here can be implemented in a computing system that includes a back end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front end component (e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0095] The computing system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system, to solve the defects of large management difficulty and weak business scalability in traditional physical host and VPS service.

[0096] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, each step described in the present application can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions of the present application can be achieved, which is not limited herein.

[0097] The above detailed description does not constitute a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A method for testing interlaminar fracture toughness of a part, characterized in that: include: Obtaining a standard test part marked with speckles, wherein the test part is a fiber-reinforced composite material including prefabricated cracks; Applying different loads to the standard test part based on a mechanical testing system, and acquiring test data of each test point at different test times using digital image correlation technology (DIC), wherein the test data includes a test image and loads; Performing a top hat transformation on the test image of each test point to obtain a processed test image, and obtaining a prefabricated crack size based on the processed test image; The interlaminar fracture toughness of the standard test part is obtained by calculating the prefabricated crack size and the load force at each test point at different test times.

2. The method according to claim 1, characterized in that The method of obtaining a standard test part marked with speckles comprises: Manufacture original test pieces for Mode I interlaminar fracture toughness test of fiber reinforced composite materials according to process specifications and test standards; A layer of white paint was sprayed on the side of the original test piece, and the black speckles were randomly marked on the side to obtain a standard test part.

3. The method according to claim 1, characterized in that The mechanical testing system includes a mechanical testing machine, a light source and a digital image acquisition device.

4. The method according to claim 3, characterized in that The mechanical testing system applies different loads to the standard test part, and obtains test data of each test point at different test times using digital image correlation technology (DIC), including: Installing the standard test part on the mechanical testing machine, and jointly debugging the light source and the image acquisition device; Starting a test on the mechanical testing system that has been debugged, and continuously increasing the load force during the test using the mechanical testing machine; Based on the DIC, the image acquisition device is used to acquire the test image containing different extension progresses of the prefabricated cracks for each test point.

5. The method according to claim 1, wherein The performing a top-hat transformation on the test image of each test point to obtain a processed test image includes: identifying prefabricated cracks of the standard test part based on the test image at each test point; The top hat transformation is used to eliminate the film bridging error on the prefabricated crack to obtain the processed test image.

6. The method according to claim 5, characterized in that The obtaining of the prefabricated crack size according to the processed test image includes: identifying prefabricated cracks in the processed test image; The identified prefabricated crack is measured to obtain the size of the prefabricated crack.

7. The method according to claim 1, characterized in that The calculating according to the prefabricated crack size and the load force at each test point at different test times to obtain the interlaminar fracture toughness of the standard test part includes: Determining a debonding-resistance curve by calculating according to the prefabricated crack size and the load force at each test point; The interlaminar fracture toughness of the standard test part is determined based on the debonding-resistance curve.

8. A device for testing interlaminar fracture toughness of a part, characterized in that: include: a standard test part acquisition module, configured to acquire a standard test part marked with speckles, wherein the test part is a fiber-reinforced composite material including prefabricated cracks; a test data acquisition module, configured to apply different loads to the standard test part based on a mechanical testing system, and acquire test data of each test point at different test times using digital image correlation technology (DIC), wherein the test data includes a test image and loads; a prefabricated crack size acquisition module, configured to perform a top-hat transformation on the test image of each test point to obtain a processed test image, and to obtain the prefabricated crack size based on the processed test image; The interlaminar fracture toughness calculation module is used to calculate the interlaminar fracture toughness of the standard test part according to the prefabricated crack size and the load force at each test point at different test times.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor. The computer program is executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method according to any one of claims 1 to 8 when executed.

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