Method, device and equipment for determining damage degree of coating

Abstract

The invention discloses a method, a device and equipment for determining the damage degree of a coating. The method comprises the following steps: acquiring the main strain and the strain state of a product coating; based on the strain state of the product coating, a first target corresponding relation is determined from a plurality of preset first corresponding relations, the first corresponding relation is the corresponding relation between the main strain of the coating and a damage index, and the damage index is the index related to the crack area of the coating; inputting the main strain of the product coating into a first target corresponding relation to obtain a damage index of the product coating; and determining the damage degree of the product coating based on the damage index of the product coating. According to the invention, the technical problem of low evaluation accuracy of the damage degree of the plating layer is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and in particular relates to a method, device and equipment for determining the damage degree of a coating. Background Art

[0002] Many industrial products, such as automotive parts and aerospace components, need to work for long periods of time in harsh service environments. The coating is an important means of surface protection for these industrial products, and its damage degree directly affects the service life of the industrial products. In the prior art, the damage degree of the coating can be assessed based on the usage time, but the accuracy is low. Since it is impossible to accurately assess the damage degree of the coating, it is impossible to accurately assess the service life of the industrial product, and it is also impossible to perform timely maintenance and replacement of the industrial product, which will reduce user satisfaction. Therefore, the low accuracy of the assessment of the damage degree of the coating is a technical problem that needs to be solved urgently. Summary of the Invention

[0003] The embodiments of the present invention provide a method, device and equipment for determining the damage degree of a coating, which solve the technical problem of low accuracy in evaluating the damage degree of a coating.

[0004] In a first aspect, an embodiment of the present invention provides a method for determining the degree of damage of a coating, comprising: obtaining the principal strain and strain state of a product coating; based on the strain state of the product coating, determining a first target correspondence from a plurality of preset first correspondences, wherein the first correspondence is a correspondence between the principal strain of the coating and a damage index, and the damage index is an index related to the crack area of ​​the coating; inputting the principal strain of the product coating into the first target correspondence to obtain the damage index of the product coating; and determining the degree of damage of the product coating based on the damage index of the product coating.

[0005] In combination with the first aspect of the present invention, in some embodiments, the first correspondence is established by the following steps: sequentially taking multiple preset principal strains as target principal strains; inputting the target principal strains into the second correspondence to obtain a target bulging height; performing a bulging test on a first sample coating to obtain the first sample coating at the target bulging height, the first sample coating being a sample coating not sprayed with speckle paint; determining a damage index of the first sample coating at the target bulging height; fitting the first bulging data to obtain the first correspondence, the first bulging data including the multiple principal strains and the damage index of the first sample coating at the bulging height corresponding to each principal strain in the multiple principal strains.

[0006] In combination with the first aspect of the present invention, in some embodiments, determining the damage index of the first sample coating at the target bulging height includes: performing an electron microscope scanning on the first sample coating at the target bulging height to obtain a scanned image; converting the scanned image into a vector image; and obtaining the damage index of the first sample coating at the target bulging height based on the vector image.

[0007] In combination with the first aspect of the present invention, in some embodiments, obtaining the damage index of the first sample coating at the target bulging height based on the vector image includes: obtaining the crack area of ​​the vector image; and taking the quotient of the crack area of ​​the vector image and the total area of ​​the vector image as the damage index of the first sample coating at the target bulging height.

[0008] In combination with the first aspect of the present invention, in some embodiments, the second correspondence is established by the following steps: performing a bulging test on the second sample coating to obtain second bulging data, the second bulging data including multiple pieces of information acquired at different times, each piece of information including the principal strain and bulging height of the second sample coating at the current moment, the first sample coating and the second sample coating having the same material type, the dimensional deviation between the first sample coating and the second sample coating being less than a preset dimensional deviation threshold, the second sample coating being a sample coating sprayed with speckle paint, and the strain state of the first sample coating being the same as the strain state of the second sample coating; and fitting the second bulging data to obtain the second correspondence.

[0009] In combination with the first aspect of the present invention, in some embodiments, the strain states of the product coating, the first sample coating, and the second sample coating are all uniaxial tensile strain states, plane strain states, or biaxial tensile strain states.

[0010] In conjunction with the first aspect of the present invention, in some embodiments, the first sample coating and the second sample coating are dog-bone shaped samples.

[0011] In combination with the first aspect of the present invention, in some embodiments, the material type of the product coating, the first sample coating and the second sample coating is zinc aluminum magnesium, and the thickness of the product coating, the first sample coating and the second sample coating is 0.54 mm to 0.7 mm.

[0012] In second aspect, an embodiment of the present invention provides a device for determining the degree of damage of a coating, comprising: an information acquisition unit for acquiring the principal strain and strain state of a product coating; a relationship determination unit for determining a first target correspondence from a plurality of preset first correspondences based on the strain state of the product coating, wherein the first correspondence is a correspondence between the principal strain of the coating and a damage index, and the damage index is an index related to the crack area of ​​the coating; an index determination unit for inputting the principal strain of the product coating into the first target correspondence to obtain a damage index of the product coating; and a degree determination unit for determining the degree of damage of the product coating based on the damage index of the product coating.

[0013] In a third aspect, an embodiment of the present invention provides an electronic device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any one of the methods described in the first aspect when executing the computer program.

[0014] The one or more technical solutions provided by the embodiments of the present invention achieve at least the following technical effects or advantages:

[0015] The embodiment of the present invention obtains the principal strain and strain state of the product coating; based on the strain state of the product coating, determines a first target correspondence from a plurality of preset first correspondences, the first correspondence being the correspondence between the principal strain of the coating and the damage index, the damage index being an index related to the crack area of ​​the coating; inputs the principal strain of the product coating into the first target correspondence to obtain the damage index of the product coating; and determines the degree of damage to the product coating based on the damage index of the product coating. The principal strain of the product coating can reflect the deformation of the product coating, and the deformation of the product coating has a strong correlation with the crack area of ​​the product coating. Therefore, the damage index of the product coating can be determined based on the principal strain of the product coating, and then the degree of damage to the product coating can be determined, thereby achieving an assessment of the degree of damage based on actual indicators and avoiding assessing the degree of damage solely by the usage time of the product coating. Therefore, the accuracy of the assessment of the degree of damage to the coating is improved;

[0016] In addition, under different strain states of the product coating, the correspondence between the principal strain and the damage index of the product coating also changes accordingly. Therefore, the first target correspondence is determined according to the strain state of the product coating, so that the first target correspondence can more accurately characterize the correspondence between the principal strain and the damage index of the product coating, and thus a more accurate damage index can be obtained, which further improves the accuracy of the assessment of the degree of coating damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 Flowchart of a method for determining the damage degree of a coating according to an embodiment of the present invention;

[0019] Figure 2 Schematic diagram of sample coatings in different strain states according to an embodiment of the present invention;

[0020] Figure 3 Schematic diagram of a sample coating sprayed with white primer and black speckle paint in an embodiment of the present invention;

[0021] Figure 4 Schematic diagram of an apparatus for performing a bulging test on a sample coating in an embodiment of the present invention;

[0022] Figure 5 Schematic diagram of a camera and a device for performing a bulging test on a sample coating in an embodiment of the present invention;

[0023] Figure 6 is a schematic diagram of a vector image in an embodiment of the present invention;

[0024] Figure 7 This is a functional module diagram of a device for determining the damage degree of a coating according to an embodiment of the present invention;

[0025] Figure 8 Schematic diagram of the structure of an electronic device in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] In the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions of various embodiments may be combined with each other, but this must be based on the fact that they can be implemented by a person of ordinary skill in the art. If the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0028] The embodiment of the present invention provides a method for determining the damage degree of a coating, referring to Figure 1 As shown, the method includes the following steps S101 to S104:

[0029] S101: Obtain the principal strain and strain state of the product coating.

[0030] It should be noted that the principal strain of the product coating refers to the linear strain corresponding to the principal stress of the product coating. The strain state of the product coating can be a uniaxial tensile strain state, a plane strain state, or a biaxial tensile strain state.

[0031] S102: Based on the strain state of the product coating, determine a first target correspondence from a plurality of preset first correspondences, where the first correspondence is a correspondence between the principal strain of the coating and a damage index, where the damage index is an index related to the crack area of ​​the coating.

[0032] It should be noted that each of the multiple first correspondences corresponds to a strain state of the product coating. If the strain state of the product coating includes a uniaxial tensile strain state, a plane strain state, and a biaxial tensile strain state, then the multiple first correspondences include a first correspondence corresponding to the uniaxial tensile strain state, a first correspondence corresponding to the plane strain state, and a first correspondence corresponding to the biaxial tensile strain state.

[0033] Specifically, the first corresponding relationship corresponding to the uniaxial tensile strain state can refer to the following formula (1), the first corresponding relationship corresponding to the plane strain state can refer to the following formula (2), and the first corresponding relationship corresponding to the biaxial tensile strain state can refer to the following formula (3):

[0034] D=Aε 2 +Bε-C (1);

[0035] D=Eε+F (2);

[0036] D=Gε Hε (3);

[0037] Among them, A, B, C, E, F, G and H are the coefficients to be calibrated, ε is the principal strain, and D is the damage index.

[0038] It should be noted that under different strain states of the product coating, the correspondence between the principal strain and the damage index of the product coating also changes accordingly. Therefore, the first target correspondence is determined according to the strain state of the product coating, so that the first target correspondence can more accurately characterize the correspondence between the principal strain and the damage index of the product coating, and thus a more accurate damage index can be obtained, which further improves the accuracy of the assessment of the degree of coating damage.

[0039] In some implementations, the first correspondence may be established through the following steps S1021 to S1025:

[0040] S1021: Sequentially taking the preset plurality of principal strains as target principal strains.

[0041] S1022: Input the target principal strain into the second corresponding relationship to obtain the target bulging height.

[0042] It should be noted that the second corresponding relationship is the corresponding relationship between the principal strain of the coating and the bulging height.

[0043] S1023: Performing a bulging test on the first sample coating to obtain the first sample coating at a target bulging height, wherein the first sample coating is a sample coating that is not sprayed with speckle paint.

[0044] It should be noted that the first sample coating at the target bulging height means that the bulging height of the first sample coating is the target bulging height.

[0045] It should be noted that the material type of the first sample coating is the same as that of the product coating, the strain state of the product coating is the same as that of the first sample coating, and the dimensional deviation between the first sample coating and the product coating is less than a preset dimensional deviation threshold. Specifically, in determining whether the dimensional deviation between the first sample coating and the product coating is less than a preset dimensional deviation threshold, the determination can be made based solely on thickness, or based on thickness, length, and width. In addition, by limiting the material type, strain state, and dimensional deviation of the first sample coating and the product coating, the first sample coating is closer to the actual situation of the product coating, thereby enabling the first corresponding relationship to more accurately characterize the corresponding relationship between the principal strain of the product coating and the damage index, thereby enabling a more accurate damage index to be obtained, thereby further improving the accuracy of the assessment of the degree of coating damage.

[0046] S1024: Determine a damage index of the first sample coating at the target bulging height.

[0047] In some embodiments, determining the damage index of the first sample coating at the target bulging height may include: performing an electron microscope scan on the first sample coating at the target bulging height to obtain a scanned image; converting the scanned image into a vector image; and obtaining the damage index of the first sample coating at the target bulging height based on the vector image.

[0048] In some embodiments, obtaining a damage index of the first sample coating at a target bulging height based on a vector image may include: obtaining a crack area of ​​the vector image; and taking the quotient of the crack area of ​​the vector image and the total area of ​​the vector image as the damage index of the first sample coating at the target bulging height.

[0049] It should be noted that the vector image can be a binary image, with the black portion representing the crack. After converting the scanned image to a vector image, since the vector image is a binary image, it is possible to more clearly distinguish between cracked and non-cracked areas in the image, thereby accurately determining the crack area and ultimately the damage index.

[0050] S1025: Fitting the first bulging data to obtain a first corresponding relationship, where the first bulging data includes a plurality of principal strains and a damage index of the first sample coating at a bulging height corresponding to each principal strain in the plurality of principal strains.

[0051] For example, assuming that the multiple principal strains include principal strain a, principal strain b, and principal strain c, and the principal strain a corresponds to the bulging height a, the principal strain b corresponds to the bulging height b, and the principal strain c corresponds to the bulging height c. The damage index of the first sample coating at the bulging height a is the damage index a, the damage index of the first sample coating at the bulging height b is the damage index b, and the damage index of the first sample coating at the bulging height c is the damage index c. Then the first bulging data includes principal strain a, principal strain b, principal strain c, damage index a, damage index b, and damage index c.

[0052] In some embodiments, the second correspondence can be established through the following steps: performing a bulging test on the second sample coating to obtain second bulging data, the second bulging data including multiple pieces of information obtained at different times, each piece of information including the principal strain and bulging height of the second sample coating at the current moment, the first sample coating and the second sample coating are of the same material type, the dimensional deviation between the first sample coating and the second sample coating is less than a preset dimensional deviation threshold, the second sample coating is a sample coating sprayed with speckle paint, and the strain state of the first sample coating is the same as the strain state of the second sample coating; fitting the second bulging data to obtain a second correspondence.

[0053] Specifically, when determining whether the dimensional deviation between the first and second sample coatings is less than a preset dimensional deviation threshold, the determination can be made based solely on thickness, or based on thickness, length, and width. Furthermore, by limiting the material type, strain state, and dimensional deviation of the first and second sample coatings, the second sample coating more closely resembles the actual state of the first sample coating. This allows the second correspondence to more accurately characterize the correspondence between the principal strain and bulge height of the first sample coating, thereby ensuring the accuracy of the first correspondence.

[0054] Specifically, the second corresponding relationship can refer to the following formula (4):

[0055] ε=J×h 3 +K×h 2 +M×h+N (4);

[0056] Among them, ε is the principal strain, h is the bulging height, J, K, M and N are the coefficients to be calibrated.

[0057] S103: Inputting the principal strain of the product coating into the first target corresponding relationship to obtain a damage index of the product coating.

[0058] S104: Determine the damage degree of the product coating based on the damage index of the product coating.

[0059] In some embodiments, the strain states of the product coating, the first sample coating, and the second sample coating are all in a uniaxial tensile strain state, a plane strain state, or a biaxial tensile strain state.

[0060] For example, assuming that the strain state of the product coating is a uniaxial tensile strain state, the strain state of the first sample coating and the second sample coating must also be a uniaxial tensile strain state. Since the strain states of the product coating, the first sample coating, and the second sample coating are the same, the first correspondence obtained based on the first sample coating can more accurately reflect the correspondence between the principal strain of the product coating and the damage index, and the second correspondence obtained based on the second sample coating can more accurately reflect the correspondence between the principal strain of the product coating and the bulging height. Therefore, when the strain states of the product coating, the first sample coating, and the second sample coating are the same, the accuracy of the first and second correspondences is guaranteed, which also guarantees the accuracy of the loss index, thereby improving the accuracy of the assessment of the degree of coating damage.

[0061] In some embodiments, the first coupon coating and the second coupon coating are dog-bone shaped coupons.

[0062] In some embodiments, the material type of the product coating, the first sample coating, and the second sample coating is zinc-aluminum-magnesium, and the thickness of the product coating, the first sample coating, and the second sample coating is 0.54 mm to 0.7 mm.

[0063] Taking a DX54D+ZM zinc-aluminum-magnesium coated steel plate with a thickness of 0.7 mm as an example, the following steps illustrate the process of obtaining the first and second correspondences:

[0064] Step 1, prepare the sample. Process the coated steel plate into dog bone samples (first sample coating, second sample coating) with three different strain states (uniaxial tensile strain state, plane strain state, biaxial tensile strain state), and process at least 4 parallel samples for each strain state. Figure 2 As shown, Figure 2 Schematic diagram of the sample coatings in different strain states in an embodiment of the present invention. When the strain state of the first sample coating and the second sample coating is a uniaxial tensile strain state, the sample length of the first sample coating and the second sample coating is 250 mm, the parallel section length is 25 mm, the parallel section width is 30 mm, and the sample width is 65 mm; when the strain state of the first sample coating and the second sample coating is a plane strain state, the sample length of the first sample coating and the second sample coating is 250 mm, the parallel section length is 25 mm, the parallel section width is 90 mm, and the sample width is 125 mm; when the strain state of the first sample coating and the second sample coating is a biaxial tensile strain state, the sample length of the first sample coating and the second sample coating is 250 mm, the parallel section length is 25 mm, the parallel section width is 180 mm, and the sample width is 215 mm. In addition, it should be noted that if this test is used to determine the first corresponding relationship and the second corresponding relationship under the uniaxial tensile strain state, the coating sample selected in the following steps should be the coating sample in the uniaxial tensile strain state.

[0065] Step 2, bulging test of the sample sprayed with speckle paint. Figure 3 、 Figure 4 and Figure 5 As shown, Figure 3 Schematic diagram of the coating of a sample sprayed with white primer and black speckle paint in an embodiment of the present invention. Figure 4 Schematic diagram of an apparatus for performing a bulging test on a sample coating in an embodiment of the present invention. Figure 5This is a schematic diagram of a camera and equipment for performing a bulging test on a sample coating according to an embodiment of the present invention. After wiping the surface of the sample coating with acetone and alcohol, one side of the coating of one group of samples is sprayed with white primer and black speckle paint. The sample with the speckle paint sprayed on one side is placed on the side of the bulging die, and the sample with the lubricating liquid applied on the other side is placed on the side of the bulging punch. Prefabricated dog-bone samples of different sizes sprayed with speckle paint are subjected to a bulging test. The punch movement speed can be 0.5 mm / s to achieve gradual deformation of the coating surface. At the same time, during the test, an optical online dynamic strain system is used to track the deformation of the sample surface, specifically including tracking the deformation of the sample surface through a camera, such as Figure 5 As shown, when the sample cracks, the test ends. The second bulging data obtained during the test is fitted to obtain the second corresponding relationship. Combined with the above formula (4), the fitted data can be referred to in the following Table 1:

[0066] Table 1:

[0067]

[0068] Step 3: Bulging test of the specimen without speckle paint. Based on the second correspondence relationship determined above, different bulging heights were calculated based on the designed principal strain values ​​of 0.01, 0.02, and 0.03. Bulging tests were then conducted on the specimen without speckle paint at these calculated bulging heights to obtain specimens with different deformations.

[0069] Step 4: Scanning electron microscope test: Based on step 3, the surfaces of the samples with principal strains of 0.01, 0.02, and 0.03 obtained from the bulging test are scanned using an electron microscope to obtain scanned photos of the surface at a magnification of 200 times.

[0070] Step 5, vector image preparation. Convert all scanned photos of the surface magnified 200 times into vector images, refer to Figure 6 As shown, Figure 6 This is a schematic diagram of a vector image in an embodiment of the present invention, where ① to ③ are vector images under uniaxial tensile strain, ④ to ⑥ are vector images under plane strain, and ⑦ to ⑨ are vector images under biaxial tensile strain. Based on the difference in color between the crack and other areas, the ratio of the crack area to the entire image area, also known as the damage index, is calculated, as shown in Table 2:

[0071] Table 2:

[0072]

[0073] Step 6: Obtaining a first corresponding relationship: Fitting the first bulging data obtained during the test process to obtain a first corresponding relationship. The data needs to be distinguished between uniaxial tensile strain state, plane strain state, and biaxial tensile strain state.

[0074] Finally, it is important to emphasize that during the specimen preparation step, dogbone specimens can be produced by milling, wire cutting, laser cutting, or water jet cutting. The prefabricated rectangular specimens are 250 mm long and between 65 and 235 mm wide. The parallel section of the specimen is 25 mm long and between 30 and 200 mm wide. The transition radius is 30 mm, and the specimen dimensional tolerance is ±0.2 mm. The speckle paint primer thickness should be less than 0.2 mm, and the speckle paint spots should be less than 0.5 mm. The primer and speckle should have good adhesion, and the speckle pattern should ensure a strain accuracy of no less than 0.1%. The specimen coating should be made of a strong material with a yield strength of 162 MPa or higher. During bulging tests, the punch speed should not exceed 1 mm / s. When measuring the bulging area using an optical online dynamic strain measurement system, the camera's center focal length should be aligned with the center of the specimen plate surface, and the camera angle should be tilted 5 to 20 degrees from the plate surface normal. During bulging experiments, the centerlines of the punch and die must be aligned with a deviation of no more than 0.15mm, and the deviation between the specimen center and the die centerline must be no more than 0.5mm. An optical online strain measurement system is used to track the deformation process during bulging tests. This system can obtain the strain state of the specimen, thereby obtaining in-plane strain data distribution to evaluate material properties, with a measurement accuracy of no less than 5%. The hardness of the bulging punch and die should be greater than 58HRC, and the roughness should be less than Ra0.4.

[0075] It should be noted that in order to solve the problem of quantitative characterization of cracks when the coating on the surface of the metal sheet is damaged, especially the problem of the relationship between the quantitative characterization of cracks and the deformation when the zinc, aluminum and magnesium coating is damaged, the embodiment of the present invention designs a set of experimental bulging dies, proposes a characterization method and prediction model for zinc, aluminum and magnesium coating damage, and realizes the determination of the damage index of the metal coating plate under different strain states and strain amounts through bulging tests under different strain paths, which can provide guidance for the performance evaluation, damage characterization and prediction of the coating material. The embodiment of the present invention makes dog bone specimens of different sizes of the evaluation material for bulging experiments, and uses an optical online dynamic strain analysis system to track the deformation of the specimen until it reaches a preset strain value. The surface crack situation of the coating is obtained based on a scanning electron microscope system (SEM), and the electron microscope scanned photos are converted into vector diagrams. The crack area and non-crack area are respectively counted, and the damage index of the material under different strain states and strain amounts is calculated by the area ratio formula. Therefore, the functional relationship between the damage index and strain is used to quantitatively characterize the degree of coating crack damage and construct a damage prediction model, thereby realizing the quantitative evaluation of coating crack damage and providing theoretical guidance for damage after deformation of the coating material.

[0076] The embodiment of the present invention obtains the principal strain and strain state of the product coating; based on the strain state of the product coating, determines a first target correspondence from a plurality of preset first correspondences, wherein the first correspondence is the correspondence between the principal strain of the coating and the damage index, where the damage index is an index related to the crack area of ​​the coating; inputs the principal strain of the product coating into the first target correspondence to obtain the damage index of the product coating; and determines the degree of damage to the product coating based on the damage index of the product coating. The principal strain of the product coating can reflect the deformation of the product coating, and the deformation of the product coating has a strong correlation with the crack area of ​​the product coating. Therefore, the damage index of the product coating can be determined based on the principal strain of the product coating, and then the degree of damage to the product coating can be determined. This achieves the evaluation of the degree of damage based on actual indicators, avoiding the evaluation of the degree of damage based solely on the service life of the product coating. Therefore, the accuracy of the coating damage assessment is improved. Furthermore, under different strain states of the product coating, the correspondence between the principal strain of the product coating and the damage index also changes accordingly. Therefore, determining the first target correspondence based on the strain state of the product coating allows the first target correspondence to more accurately characterize the correspondence between the principal strain of the product coating and the damage index, thereby obtaining a more accurate damage index, further improving the accuracy of the coating damage assessment. Furthermore, because the damage index is an index related to the crack area of ​​the coating, the embodiments of the present invention also solve the technical problem of difficulty in quantifying the coating damage degree.

[0077] Based on the same invention concept, Figure 7 As shown, an embodiment of the present invention provides a device 10 for determining the damage degree of a coating, comprising: an information acquisition unit 110, for acquiring the principal strain and strain state of a coating of a product; a relationship determination unit 120, for determining a first target correspondence from a plurality of preset first correspondences based on the strain state of the coating of the product, the first correspondence being the correspondence between the principal strain of the coating and the damage index, the damage index being an index related to the crack area of ​​the coating; an index determination unit 130, for inputting the principal strain of the coating of the product into the first target correspondence to obtain the damage index of the coating of the product; and a degree determination unit 140, for determining the damage degree of the coating of the product based on the damage index of the coating of the product.

[0078] It is understood that the coating damage degree determination device 10 further includes: a first relationship establishment unit, configured to establish a first corresponding relationship through the following steps: sequentially using a plurality of preset principal strains as target principal strains; inputting the target principal strains into a second corresponding relationship to obtain a target bulging height; performing a bulging test on a first sample coating to obtain a first sample coating at the target bulging height, wherein the first sample coating is a sample coating not sprayed with speckle paint; determining a damage index of the first sample coating at the target bulging height; fitting the first bulging data to obtain a first corresponding relationship, wherein the first bulging data includes a plurality of principal strains and a damage index of the first sample coating at the bulging height corresponding to each principal strain in the plurality of principal strains. Determining the damage index of the first sample coating at the target bulging height includes: performing an electron microscope scanning on the first sample coating at the target bulging height to obtain a scanned image; converting the scanned image into a vector image; and obtaining the damage index of the first sample coating at the target bulging height based on the vector image. Among them, based on the vector image, the damage index of the first sample coating at the target bulging height is obtained, including: obtaining the crack area of ​​the vector image; and taking the quotient of the crack area of ​​the vector image and the total area of ​​the vector image as the damage index of the first sample coating at the target bulging height.

[0079] It can be understood that the device 10 for determining the degree of damage to the coating also includes: a second relationship establishing unit, which is used to establish a second corresponding relationship through the following steps: performing a bulging test on the second sample coating to obtain second bulging data, the second bulging data including multiple pieces of information obtained at different times, each piece of information in the multiple pieces of information including the principal strain and bulging height of the second sample coating at the current moment, the first sample coating and the second sample coating having the same material type, the dimensional deviation between the first sample coating and the second sample coating being less than a preset dimensional deviation threshold, the second sample coating being a sample coating sprayed with speckle paint, and the strain state of the first sample coating being the same as the strain state of the second sample coating; fitting the second bulging data to obtain a second corresponding relationship.

[0080] The strain states of the product coating, the first sample coating, and the second sample coating were all uniaxial tensile, plane, or biaxial tensile. The first and second sample coatings were dog-bone shaped. The material types of the product coating, the first sample coating, and the second sample coating were zinc-aluminum-magnesium, and the thicknesses of the product coating, the first sample coating, and the second sample coating ranged from 0.54 mm to 0.7 mm.

[0081] It should be understood that more implementation details of the device 10 for determining the damage degree of the coating in the embodiment of the present invention are described in the aforementioned method for determining the damage degree of the coating, and for the sake of brevity of the description, they will not be repeated here.

[0082] Based on the same inventive concept, an embodiment of the present invention further provides an electronic device, such as Figure 8 As shown, it includes a memory 804, a processor 802 and a computer program stored in the memory 804 and capable of running on the processor 802. The processor 802 executes the program to implement the steps described in any embodiment of the method for determining the damage degree of the coating.

[0083] Among them, Figure 8 In the embodiment of the present invention, a bus architecture (represented by bus 800) is shown. Bus 800 may include any number of interconnected buses and bridges, and bus 800 links together various circuits including one or more processors represented by processor 802 and memory represented by memory 804. Bus 800 may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 805 provides an interface between bus 800 and receiver 801 and transmitter 803. Receiver 801 and transmitter 803 may be the same component, namely a transceiver, which provides a unit for communicating with various other devices over a transmission medium. Processor 802 is responsible for managing bus 800 and general processing, while memory 804 may be used to store data used by processor 802 when performing operations.

[0084] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of the present invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwiring, or a combination of any of these. Furthermore, each functional unit may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit.

[0085] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of the units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0086] The units described as separate components may or may not be physically separate, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0087] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc. Various media that can store program codes.

[0088] The foregoing description is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be included within the scope of the claims.

Claims

1. A method for determining the damage degree of a coating, characterized in that: include: Obtain the principal strain and strain state of the product coating; Based on the strain state of the coating of the product, determining a first target corresponding relationship from a plurality of preset first corresponding relationships, wherein the first corresponding relationship is a corresponding relationship between the principal strain of the coating and a damage index, wherein the damage index is an index related to the crack area of ​​the coating; Inputting the principal strain of the product coating into the first target correspondence to obtain a damage index of the product coating; Based on the damage index of the coating on the product, the degree of damage to the coating on the product is determined.

2. The method for determining the damage degree of the coating according to claim 1, wherein: The first corresponding relationship is established through the following steps: Sequentially taking multiple preset principal strains as target principal strains; Inputting the target principal strain into the second corresponding relationship to obtain a target bulging height; Performing a bulging test on a first sample coating to obtain the first sample coating at the target bulging height, wherein the first sample coating is a sample coating not sprayed with speckle paint; determining a damage index of the coating of the first sample at the target bulging height; The first bulging data is fitted to obtain the first corresponding relationship, where the first bulging data includes the plurality of principal strains and a damage index of the first sample coating at a bulging height corresponding to each principal strain in the plurality of principal strains.

3. The method for determining the damage degree of the coating according to claim 2, wherein: Determining the damage index of the first sample coating at the target bulging height includes: Performing electron microscope scanning on the first sample coating at the target bulging height to obtain a scanned image; Converting the scanned image into a vector image; Based on the vector image, a damage index of the first sample coating at the target bulging height is obtained.

4. The method for determining the damage degree of the coating according to claim 3, wherein: The obtaining, based on the vector image, a damage index of the first sample coating at the target bulging height includes: Obtaining the crack area of ​​the vector image; The quotient of the crack area of ​​the vector image and the total area of ​​the vector image is used as the damage index of the first sample coating at the target bulging height.

5. The method for determining the damage degree of the coating according to claim 2, wherein: The second corresponding relationship is established through the following steps: performing a bulging test on the second sample coating to obtain second bulging data, the second bulging data including multiple pieces of information acquired at different times, each piece of information including a principal strain and a bulging height of the second sample coating at a current moment, the first sample coating and the second sample coating being of the same material type, a dimensional deviation between the first sample coating and the second sample coating being less than a preset dimensional deviation threshold, the second sample coating being a sample coating sprayed with speckle paint, and the strain state of the first sample coating being the same as the strain state of the second sample coating; The second bulging data is fitted to obtain the second corresponding relationship.

6. The method for determining the damage degree of the coating according to claim 5, wherein: The strain states of the product coating, the first sample coating, and the second sample coating are all in a uniaxial tensile strain state, a plane strain state, or a biaxial tensile strain state.

7. The method for determining the damage degree of the coating according to claim 5, wherein: The first sample coating and the second sample coating are dog-bone shaped samples.

8. The method for determining the damage degree of a coating according to any one of claims 5 to 7, wherein: The material type of the product coating, the first sample coating and the second sample coating is zinc-aluminum-magnesium, and the thickness of the product coating, the first sample coating and the second sample coating is 0.54 mm to 0.7 mm.

9. A device for determining the damage degree of a coating, characterized in that: include: An information acquisition unit, used to obtain the principal strain and strain state of the product coating; a relationship determining unit, configured to determine, based on the strain state of the coating of the product, a first target corresponding relationship from a plurality of preset first corresponding relationships, wherein the first corresponding relationship is a corresponding relationship between the principal strain of the coating and a damage index, wherein the damage index is an index related to the crack area of ​​the coating; an index determination unit, configured to input the principal strain of the product coating into the first target correspondence to obtain a damage index of the product coating; The degree determination unit is used to determine the damage degree of the product coating based on the damage index of the product coating.

10. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method according to any one of claims 1 to 8 when executing the computer program.

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