Grating and household appliance

Abstract

The application relates to a grid and a household device. The grid is in a long strip shape, and the cross section of the grid is in a preset shape type; the target structure parameter corresponding to the cross section of the grid and the preset shape type satisfies a preset structure parameter interrelation matched with the material type of the grid and the preset shape type.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and in particular to a grille and household equipment. Background Technology

[0002] When designing household appliances, there are strict strength testing standards for specific injection molded parts structures. Currently, the impact strength of grilles in household appliances can be predicted through simulation.

[0003] However, the strength of the grid can only be simulated and predicted after the design is completed. If the grid after the design is completed cannot meet the strength test standards, there will be hidden dangers in product quality, resulting in a low product yield. Summary of the Invention

[0004] Therefore, it is necessary to provide a grille and a household appliance to address the aforementioned technical problems.

[0005] In a first aspect, this application provides a grille, which is an elongated strip structure, and the cross-section of the grille is a preset shape type;

[0006] The cross-section of the grille and the target structural parameters corresponding to the preset shape type satisfy the relationship between preset structural parameters that match the material type and the preset shape type of the grille.

[0007] In one embodiment, the preset shape type is a hexagon, and the target structural parameters include: the length of the first side of the hexagon, the length of the second side of the hexagon, the length of the center line segment, the distance between the first side and the center line segment, and the distance between the center line segment and the second side; wherein, the length of the center line segment is greater than the length of the first side, the length of the center line segment is greater than the length of the second side, the first side is located on the first surface of the grille, the second side is located on the second surface of the grille, the center line segment is parallel to the first side and the second side, and the two endpoints corresponding to the center line segment are the vertices of the hexagon.

[0008] In one embodiment, the relationship between the preset structural parameters is represented by a functional relationship, which is expressed as: q 11 ×L1+q 12 ×L2+q 13 ×L3+q 14 ×L4+q 15 ×(L3) 2 +q 16 ×L0×L3+q 17 ×L1×L2+q 18 ×L1×L4+q 19 ×L2×L3+q 20×L3×L4+q 21 ≤Calibrated structural failure value;

[0009] Wherein, L0 is the length of the first side, L2 is the length of the second side, L1 is the length of the center line segment, L3 is the distance between the first side and the center line segment, and L4 is the distance between the center line segment and the second side.

[0010] In one embodiment, the material type of the grille is PP-GF23, q 11 =-0.11, q 12 =-0.16, q 13 =-0.112, q 14 The value is -0.061, q 15 q is 0.006. 16 =-0.004, q 17 q is 0.0225. 18 q is 0.006. 19 q is 0.013. 20 q is 0.003. 21 It is 1.013.

[0011] In one embodiment, the failure value of the calibration structure is 0.25.

[0012] In one embodiment, the material type of the grille is PBT-GF30_FR, q 11 =-0.2, q 12 =-0.1, q 13 =-0.03, q 14 The value is -0.042, q 15 q is 0.001. 16 =-0.007, q 17 q is 0.016. 18 q is 0.0015. 19 q is 0.032. 20 q is 0.004. 21 It is 0.83.

[0013] In one embodiment, the failure value of the calibration structure is 0.2.

[0014] In one embodiment, the material type of the grille is PP-HG-HR, q 11 =-0.3, q 12 =-0.21, q 13 The value is -0.026, q 14 The value is -0.037, q 15 q is 0.0018. 16The value is -0.0045, q 17 q is 0.021. 18 q is 0.0023. 19 q is 0.027. 20 q is 0.0031. 21 It is 1.33.

[0015] In one embodiment, the failure value of the calibration structure is 0.32.

[0016] In one embodiment, the length of the first side is greater than 0.7 mm and less than 2.5 mm.

[0017] In one embodiment, the length of the center line segment is greater than or equal to 2 mm, and the length of the center line segment is less than or equal to 3 mm.

[0018] In one embodiment, the difference between the distance between the first side and the center line segment and the first value is within a first preset range, and the first value is the value obtained by multiplying the first preset value by the distance between the center line segment and the second side.

[0019] In one embodiment, the first preset value is 3 / 7.

[0020] In one embodiment, the first preset value is 4 / 6.

[0021] In one embodiment, the difference between the product of the length of the center line segment and the second preset value and the second value is within a second preset range, and the second value is the sum of the distance between the first side and the center line segment and the distance between the center line segment and the second side.

[0022] In one embodiment, the area of ​​the hexagon is greater than or equal to 15 mm². 2 .

[0023] Secondly, this application provides a household appliance, the household appliance being a grille as described in the first aspect or one embodiment of the first aspect.

[0024] In one embodiment, the household appliance includes at least one of the following: a fan, an electric heater, or a rice cooker.

[0025] The aforementioned grilles and household appliances have elongated strip structures with a cross-section of a preset shape. The target structural parameters corresponding to the cross-section and preset shape satisfy the relationship between the preset structural parameters that match the material type and the preset shape. In this way, without designing the finished grille, it is possible to predict in advance whether the strength of the grille meets the safety requirements based on the relationship between the preset structural parameters. This ensures the quality of the finished product and improves the product yield when designing the finished product based on the predicted grille. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the grille in an electric heater in one embodiment;

[0027] Figure 2 This is a schematic diagram of the grille in a rice cooker in one embodiment;

[0028] Figure 3 This is a schematic diagram of the fan structure in one embodiment;

[0029] Figure 4 This is a schematic diagram of a hexagonal shape as a preset shape type in one embodiment;

[0030] Figure 5 This is a schematic diagram of the appearance of a grille with a preset shape type of hexagon in one embodiment;

[0031] Figure 6 This is a diagram illustrating the application environment of the grille safety determination method in one embodiment;

[0032] Figure 7 This is a flowchart illustrating a method for determining the safety of a grille in one embodiment;

[0033] Figure 8 This is a flowchart illustrating a method for obtaining the relationship between preset structural parameters in one embodiment;

[0034] Figure 9 This is a flowchart illustrating the method for obtaining the calibration structure failure value in one embodiment;

[0035] Figure 10 This is a schematic diagram of the process of obtaining the extrapolated true stress curve of plastic strain based on the first force-displacement curve in one embodiment.

[0036] Figure 11 This is a schematic diagram of the engineering stress-strain curve in one embodiment;

[0037] Figure 12 This is a schematic diagram of the actual stress-strain curve in one embodiment;

[0038] Figure 13 This is a schematic diagram of the actual plastic stress-strain curve in one embodiment;

[0039] Figure 14 This is a schematic diagram of the extrapolated plastic strain true stress curve in one embodiment. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0041] In this embodiment, the grille can be applied to household appliances, such as fans, electric heaters, rice cookers, and other devices with grille structures; wherein, the grille is a long strip structure, specifically, Figure 1 This is a schematic diagram of the grille in an electric heater; the grille in the electric heater is the air outlet grille. Figure 2 This is a schematic diagram of the grille inside a rice cooker. The grille inside the rice cooker is a heat dissipation grille.

[0042] For ease of description, the following explanation will use the application of grilles to fans as an example. Specifically, as shown in the example... Figure 3 As shown, a schematic diagram of a fan structure is provided, wherein the fan 302 includes a grille 304, which may include a front grille and a rear grille. Specifically, Figure 3 This is an exemplary description using the front mesh cover 304 as an example. The front mesh cover 304 includes multiple grilles 306. Each grille is a long strip structure in the front mesh cover 304. The cross-section of the grille is a preset shape type, and the target structural parameters corresponding to the cross-section of the grille and the preset shape type satisfy the relationship between the preset structural parameters that match the material type and the preset shape type of the grille.

[0043] It is understandable that when manufacturing household appliances based on grilles, the spacing between adjacent grilles is less than or equal to 10mm. For example, when manufacturing a fan cover based on grilles, the number of grilles in the middle of the cover is more than the number of grilles around the perimeter. By setting the spacing between adjacent air outlet grilles to less than or equal to 10mm, it is ensured that the test finger will not touch the fan blades and live components, thus ensuring the safety of the test personnel.

[0044] In one embodiment, the preset shape type can be a quadrilateral, hexagon, octagon, or other polygons. Specifically, when the preset shape type is a hexagon, the target structural parameters include: the length of the first side of the hexagon, the length of the second side of the hexagon, the length of the center line segment, the distance between the first side and the center line segment, and the distance between the center line segment and the second side.

[0045] The length of the center line segment is greater than the length of the first side, the length of the center line segment is greater than the length of the second side, the first side is on the first face of the grid, the second side is on the second face of the grid, the center line segment is parallel to the first side and the second side, and the two endpoints of the center line segment are the vertices of the hexagon.

[0046] For example, when a grille is applied to a fan or electric heater, the first side is the air outlet side and the second side is the air inlet side. Specifically, when a grille is applied to a fan, the first side is on the outer surface of the fan's mesh cover and the second side is on the inner surface of the fan's mesh cover; when a grille is applied to a rice cooker, the first side is the heat outlet side and the second side is the heat inlet side.

[0047] For example, such as Figure 4 As shown, a schematic diagram with a preset shape type of hexagon is provided, wherein L0 is the length of the first side of the hexagon, L2 is the length of the second side of the hexagon, L1 is the length of the center line segment, L3 is the distance between the first side and the center line segment, and L4 is the distance between the center line segment and the second side.

[0048] Specifically, the following can be set: 0.7 < L0 < 2.5, L1 > L0, L1 > L2, 2 ≤ L1 ≤ 3, L3:L4 ≈ 3:7, or L3:L4 ≈ 4:6, (L3 + L4) ≈ 2.5 × L1; where L3:L4 ≈ 3:7 or L3:L4 ≈ 4:6 can be understood as the difference between L3 and the first value being within the first preset range, and the first value being the product of L4 and the first preset value, with the first preset value being 3 / 7 or 4 / 6; (L3 + L4) ≈ 2.5 × L1 can be understood as the difference between the product of L1 and the second preset value and the second value being within the second preset range, and the second value being the sum of L4 and L3, with the second preset value being 2.5.

[0049] It should be noted that when 2≤L1≤3, L1 should be set as small as possible. This ensures both the strength of the grille and the heat dissipation or airflow effect. When selecting parameter values ​​within the range described above, and when the selected parameter values ​​also meet the strength requirements, the area of ​​the corresponding hexagon should be greater than or equal to 15mm². 2 .

[0050] It should be noted that when the preset shape type is hexagonal, although the relevant parameters of the hexagon are set according to the range described above, it is still necessary to predict whether the grid strength safety is met when the grid is designed based on the set parameters. The specific details will be described later.

[0051] For example, taking the application of grilles to a fan as an example, such as Figure 5As shown, a schematic diagram of a grille with a preset shape of hexagon is provided, where a represents the first side of the hexagon, c represents the second side of the hexagon, b represents the center line segment, a is located on the air outlet side of the grille, and c is located on the windward side of the grille.

[0052] exist Figures 1 to 5 Based on the schematic diagram shown, when the preset shape type is hexagonal but the material type of the grille is different, the relationship between the preset structural parameters will also be different. This relationship can be represented by a function, expressed as: q 11 ×L1+q 12 ×L2+q 13 ×L3+q 14 ×L4+q 15 ×(L3) 2 +q 16 ×L0×L3+q 17 ×L1×L2+q 18 ×L1×L4+q 19 ×L2×L3+q 20 ×L3×L4+q 21 ≤Calibrated structural failure value.

[0053] Specifically, when the material type of the grille is PP-GF23, q 11 It can be -0.11, q 12 It can be -0.16, q 13 It can be -0.112, q 14 It can be -0.061, q 15 It can be 0.006, q 16 It can be -0.004, q 17 It can be 0.0225, q 18 It can be 0.006, q 19 It can be 0.013, q 20 It can be 0.003, q 21 It can be 1.013. When the material type of the grille is PP-GF23, the corresponding calibration structural failure value is 0.25. Then the function relationship is expressed as: -0.11×L1-0.16×L2-0.112×L3-0.061×L4+0.006×(L3) 2 -0.004×L0×L3+0.0225×L1×L2+0.006×L1×L4+0.013×L2×L3+0.003×L3×L4+1.013≤0.25.

[0054] Specifically, when the material type of the grille is PBT-GF30_FR, q 11 It can be -0.2, q12 It can be -0.1, q 13 It can be -0.03, q 14 It can be -0.042, q 15 It can be 0.001, q 16 It can be -0.007, q 17 It can be 0.016, q 18 It can be 0.0015, q 19 It can be 0.032, q 20 It can be 0.004, q 21 It can be 0.83. When the material type of the grille is PBT-GF30_FR, the corresponding calibration structural failure value is 0.2. Then the function relationship is expressed as: -0.2×L1-0.1×L2-0.03×L3-0.042×L4+0.001×(L3) 2 -0.007×L0×L3+0.016×L1×L2+0.0015×L1×L4+0.032×L2×L3+0.004×L3×L4+0.83≤0.2.

[0055] Specifically, when the material type of the grille is PP-HG-HR, q 11 It can be -0.3, q 12 It can be -0.21, q 13 It can be -0.026, q 14 It can be -0.037, q 15 It can be 0.0018, q 16 It can be -0.0045, q 17 It can be 0.021, q 18 It can be 0.0023, q 19 It can be 0.027, q 20 It can be 0.0031, q 21 The value can be 1.33. When the material type of the grille is PP-HG-HR, the corresponding calibration structural failure value is 0.32. The functional relationship is then expressed as: -0.3×L1-0.21×L2-0.026×L3-0.037×L4+0.0018×(L3) 2 -0.0045×L0×L3+0.021×L1×L2+0.0023×L1×L4+0.027×L2×L3+0.0031×L3×L4+1.33≤0.32.

[0056] It should be noted that when the grille is applied to a fan, the material of the grille in the fan can be PP-GF23, PBT-GF30_FR, or PP-HG-HR. In this application, the material of the grille in the fan is PP-GF23. When the grille is applied to an electric heater, the material of the grille in the electric heater can be PP-GF23, PBT-GF30_FR, or PP-HG-HR. In this application, the material of the grille in the electric heater is PBT-GF30_FR. When the grille is applied to a rice cooker, the material of the grille in the rice cooker can be PP-GF23, PBT-GF30_FR, or PP-HG-HR. In this application, the material of the grille in the rice cooker is PP-HG-HR.

[0057] It is understandable that, since the cross-section of the grille and the target structural parameters corresponding to the preset shape type satisfy the relationship between the preset structural parameters that match the material type and preset shape type of the grille, the strength and safety of the grille can be predicted based on the relationship between the target structural parameters and the preset structural parameters when determining the material type and the target structural parameters corresponding to the preset shape type of the grille.

[0058] Specifically, this application provides a method for determining the safety of a grille. The grille safety determination method provided in the embodiments of this application can be applied to, for example... Figure 6 In the application environment shown, terminal 602 communicates with server 604 via a network. The data storage system can store the data that server 604 needs to process. The data storage system can store the target structural parameters corresponding to the cross-section of the grille and the preset shape type. The data storage system can be integrated on server 604 or placed on the cloud or other network servers.

[0059] Specifically, terminal 602 sends the target structural parameters corresponding to the shape type of the grille to server 604. Then, server 604 predicts the strength and safety of the grille based on the corresponding target structural parameters and the relationship between the preset structural parameters that match the material type and preset shape type of the grille.

[0060] exist Figure 6 Based on the embodiments shown, such as Figure 7 The diagram shows a flowchart of a method for determining the safety of a grille, which is applied to... Figure 6 Taking a 604 error on a server as an example, the steps are as follows:

[0061] S702, based on the relationship between the material type of the grille and the preset structural parameters that match the preset shape type, predicts the cross-section of the grille and the target structural parameters corresponding to the preset shape type to obtain the predicted strength value of the grille.

[0062] In this embodiment, the content of the relationship between the preset structural parameters can be adapted to the description above. The relationship between the preset structural parameters can be represented by the magnitude relationship between the predicted strength value and the calibrated structural failure value. For example, the relationship between the preset structural parameters can be expressed as: predicted strength value ≤ calibrated structural failure value.

[0063] Combination Figure 4 When the material type of the grid is PP-GF23, the preset shape type is hexagonal, and the target structural parameters are L0, L1, L2, L3, and L4, substituting L0, L1, L2, L3, and L4 into the formula yields the predicted strength value. The formula is expressed as: -0.11×L1 - 0.16×L2 - 0.112×L3 - 0.061×L4 + 0.006×(L3) 2 -0.004×L0×L3+0.0225×L1×L2+0.006×L1×L4+0.013×L2×L3+0.003×L3×L4+1.013.

[0064] S704, based on the relationship between the predicted strength value and the corresponding calibration structural failure value, predicts the safety of the grid's strength.

[0065] In this embodiment, when the predicted strength value is less than or equal to the calibrated structural failure value, the strength of the predicted grid meets safety requirements. Thus, the household equipment designed and manufactured based on the material type, the preset shape type, and the target structural parameters can ensure the safety of customers during use and guarantee the yield rate of the household equipment.

[0066] The calibration structural failure values ​​are different for different preset shape types and material types. For example, when the preset shape type is hexagonal and the material type of the grille is PP-GF23, the calibration structural failure value is 0.25; when the preset shape type is hexagonal and the material type of the grille is PBT-GF30_FR, the calibration structural failure value is 0.2; and when the preset shape type is hexagonal and the material type of the grille is PP-HG-HR, the calibration structural failure value is 0.32.

[0067] It is understood that the specific values ​​of the calibration structure failure values ​​corresponding to different preset shape types and material types can be set according to the actual application scenario, and this embodiment does not limit them.

[0068] Combination Figure 4Taking the application of grilles in fans, with the grille material type being PP-GF23 and a rated structural failure value of 0.25 as an example, Table 1 describes the structural parameters of the grilles of three fans that meet the safety requirements. It can be seen that the predicted strength values ​​of the grilles of the three fans are all less than 0.25. Therefore, the strength of the grilles of the three fans meets the safety requirements.

[0069] Table 1

[0070]

[0071] It should be noted that in Table 1, the strength of either set of structural parameters corresponding to the grille of each type of fan meets the safety requirements. Therefore, the structural parameter corresponding to the smallest hexagonal area can be selected from the two sets of structural parameters to determine the final structural parameter. Based on the selected structural parameter, the finished fan can be designed.

[0072] Combination Figure 4 Taking the application of a grille in an electric heater, with the grille material type being PBT-GF30_FR and a rated structural failure value of 0.2 as an example, Table 2 describes the structural parameters of the grille of an electric heater that meets safety requirements.

[0073] Table 2

[0074] <![CDATA[L0]]> <![CDATA[L1]]> <![CDATA[L2]]> <![CDATA[L3]]> <![CDATA[L4]]> Predicted intensity value 1.87 2.5 1.87 3.6 4.1 0.161108

[0075] Combination Figure 4 Taking a grid applied to a rice cooker, with the grid material type being PP-HG-HR and a rated structural failure value of 0.32 as an example, Table 3 describes the structural parameters of the grid in a rice cooker that meets safety requirements.

[0076] Table 3

[0077] <![CDATA[L0]]> <![CDATA[L1]]> <![CDATA[L2]]> <![CDATA[L3]]> <![CDATA[L4]]> Predicted intensity value 2.49 3 1.89 2.3 4.8 0.081108

[0078] In summary, Figure 5 In the illustrated embodiment, the cross-section of the grille and the target structural parameters corresponding to the preset shape type are predicted based on the relationship between the material type and the preset shape type of the grille. The predicted strength value of the grille is obtained, and the safety of the grille's strength is predicted based on the relationship between the predicted strength value and the corresponding calibration structural failure value. In this way, when the strength of the grille meets the safety requirements, the household equipment made from the grille designed based on the cross-section of the grille, the target structural parameters corresponding to the preset shape type, and the material of the grille can ensure the safety of customers during use and ensure the yield rate of the household equipment.

[0079] exist Figure 7Based on the illustrated embodiments, in one of the embodiments, such as Figure 8 As shown, a method for obtaining the relationship between preset structural parameters is provided, and this method is applied to... Figure 6 Taking a 604 error on a server as an example, the steps are as follows:

[0080] S802, obtain the material type of the grille and the actual structural parameters corresponding to the preset shape type that meet the strength and safety requirements of the grille.

[0081] In this embodiment, the actual structural parameters can be the structural parameters of the finished grid designed based on the material type and preset shape type of the grid, and the measured structural parameters of the grid when the finished grid meets the safety requirements. It can be understood that when the strength of the finished grid meets the safety requirements, the structural parameters of the grid corresponding to different material types and shape types can be measured and stored in the database. In this way, when these parameters are needed, they can be directly selected from the database without re-measuring, thereby improving the efficiency of obtaining the relationship between preset structural parameters and thus improving the efficiency of predicting the strength and safety of the grid.

[0082] S804 establishes multiple sets of experimental structural parameters based on real structural parameters and the range of preset structural parameters.

[0083] In this embodiment, the preset structural parameters are related to the preset shape type. The preset structural parameters are used to represent the length relationship of the sides corresponding to the preset shape type. Specifically, when the preset shape type is hexagonal, combined with... Figure 4 The preset structural parameters correspond to a range of 100%. Figure 4 The ranges described by the parameters in the table are not elaborated here.

[0084] S806, an impact simulation model is established based on the extrapolated plastic strain true stress curve. According to the impact simulation model and multiple sets of experimental structural parameters, the corresponding fracture failure value is obtained.

[0085] In this embodiment, each set of structural parameters can be simulated three times based on the impact simulation model, and the fracture failure value obtained from the third simulation can be determined as the fracture failure value corresponding to that set of structural parameters.

[0086] exist Figure 4 Based on the content shown, as shown in Table 4, a fracture failure value corresponding to different groups of structural parameters after three simulations is provided. The fracture failure value obtained from the third simulation can be determined as the fracture failure value corresponding to the group of structural parameters.

[0087] Table 4

[0088]

[0089] S808 uses multiple sets of experimental structural parameters as variables and the corresponding fracture failure values ​​as targets to fit the multiple sets of experimental structural parameters and the corresponding fracture failure values ​​to obtain the relationship between the preset structural parameters.

[0090] In S806 and S808, an experimental design (DOE) matrix can be designed. The DOE matrix stores each set of experimental structural parameters and the corresponding fracture failure value. Using multiple sets of experimental structural parameters in the DOE matrix as variables and the corresponding fracture failure value as the objective, the relationship between the preset structural parameters can be obtained by fitting the multiple sets of experimental structural parameters and the corresponding fracture failure value using an approximate model method.

[0091] In summary, Figure 8 In the illustrated embodiment, by obtaining the actual structural parameters corresponding to the material type and preset shape type of the grille to meet the strength safety requirements of the grille, multiple sets of experimental structural parameters can be established based on the actual structural parameters and the range corresponding to the preset structural parameters. Then, an impact simulation model is established based on the extrapolated plastic strain true stress curve. According to the impact simulation model and multiple sets of experimental structural parameters, the corresponding fracture failure values ​​are obtained. Using multiple sets of experimental structural parameters as variables and the corresponding fracture failure values ​​as targets, the multiple sets of experimental structural parameters and the corresponding fracture failure values ​​are fitted to obtain the relationship between the preset structural parameters. In this way, based on the relationship between the preset structural parameters obtained from the actual structural parameters corresponding to the material type and preset shape type of the grille that meet the safety requirements, the strength safety of grilles designed with different structural parameters of the same material type and the same preset shape type can be predicted based on the relationship between the preset structural parameters, which can improve the prediction accuracy of the strength safety of the grille.

[0092] exist Figure 8 Based on the illustrated embodiments, in one of the embodiments, such as Figure 9 The diagram shows a flowchart illustrating a method for obtaining the failure value of a calibration structure. This method is then applied to... Figure 6 Taking a 604 error on a server as an example, the steps are as follows:

[0093] S902, obtain the first force-displacement curve obtained by tensile test, the second force-displacement curve obtained by bending test, and the first absorbed energy of the experimental specimen when the material fails, obtained by impact test.

[0094] The experimental specimen and the grid have the same preset shape and material type. By conducting tensile, bending and impact tests on the experimental specimen, the experimental process of the grid can be simulated, thereby obtaining the force-displacement curve and absorbed energy related to the grid. Then, based on the force-displacement curve and absorbed energy, subsequent processing can be performed.

[0095] S904, based on the first force displacement curve, the extrapolated plastic strain true stress curve is obtained.

[0096] The first force-displacement curve is obtained from the tensile test of the experimental specimen. In order to combine the experimental process and the simulation process to obtain the calibration structural failure value, it is necessary to convert the first force-displacement curve obtained from the experimental process into the extrapolated plastic strain true stress curve required by the simulation process.

[0097] S906 establishes tensile simulation models, bending simulation models, and impact simulation models based on extrapolated plastic strain true stress curves.

[0098] S908 uses a tensile simulation model to simulate the simulation object corresponding to the experimental spline and obtains the third force-displacement curve.

[0099] S910 uses a bending simulation model to simulate the object and obtains the fourth force displacement curve.

[0100] S912 uses an impact simulation model to simulate the object and obtain the second absorbed energy.

[0101] S914. Based on the similarity between the first force-displacement curve and the third force-displacement curve, the similarity between the second force-displacement curve and the fourth force-displacement curve, and the relationship between the magnitudes of the first absorbed energy and the second absorbed energy, the failure value of the calibration structure is determined.

[0102] In S906 and S914, the simulation object is an object established based on experimental splines, which is used as the experimental object in the simulation process. Then, the third force-displacement curve can be obtained from the tensile simulation model established based on the extrapolated plastic strain true stress curve, the fourth force-displacement curve can be obtained from the bending simulation model established based on the extrapolated plastic strain true stress curve, and the second absorbed energy can be obtained from the impact simulation model established based on the extrapolated plastic strain true stress curve. Based on the similarity between the first and third force-displacement curves, the similarity between the second and fourth force-displacement curves, and the relationship between the magnitudes of the first and second absorbed energies, the failure value of the calibration structure is determined.

[0103] Specifically, when the first force-displacement curve is similar to the third force-displacement curve, the second force-displacement curve is similar to the fourth force-displacement curve, and the magnitudes of the first absorbed energy and the second absorbed energy are the same, the material failure value corresponding to the first absorbed energy or the second absorbed energy is determined as the calibration structural failure value.

[0104] The similarity between the first force displacement curve and the third force displacement curve can be defined as the similarity between the first force displacement curve and the third force displacement curve within a first calibration range. The similarity between the second force displacement curve and the fourth force displacement curve can be defined as the similarity between the second force displacement curve and the fourth force displacement curve within a second calibration range. The specific contents of the first calibration range and the second calibration range can be set according to the actual application scenario, and this embodiment does not limit them.

[0105] It should be noted that when the first force-displacement curve is not similar to the third force-displacement curve, and / or the second force-displacement curve is not similar to the fourth force-displacement curve, it indicates that the tensile simulation model and bending simulation model established based on the extrapolated plastic strain true stress curve are unreasonable. That is, the obtained first force-displacement curve is unreasonable. Therefore, tensile tests are required to obtain the first force-displacement curve again until the first force-displacement curve is similar to the third force-displacement curve and the second force-displacement curve is similar to the fourth force-displacement curve. Only then can the calibration structural failure value be obtained based on the impact simulation model and impact simulation test.

[0106] exist Figure 9 Based on the illustrated embodiments, in one of the embodiments, such as Figure 10 The diagram illustrates a process for obtaining the extrapolated true stress curve of plastic strain based on the first force-displacement curve. This method is then applied to… Figure 6 Taking a 604 error on a server as an example, the steps are as follows:

[0107] S1002, convert the first force-displacement curve into an engineering stress-strain curve, and obtain the test curve corresponding to the elastic stage in the engineering stress-strain curve.

[0108] In this embodiment, the engineering stress-strain curve includes curves for the elastic stage and curves for the plastic stage. In order to obtain the curve for the elastic stage required for the simulation process, it is necessary to extract the curve corresponding to the elastic stage in the engineering stress-strain curve. Specifically, the engineering stress-strain curve is truncated at the peak point position, and the engineering stress-strain curve before the peak point position is determined as the test curve corresponding to the elastic stage in the engineering stress-strain curve.

[0109] For example, such as Figure 11 As shown, a schematic diagram of an engineering stress-strain curve is provided, where the horizontal axis represents strain, and strain is represented by ε. e The vertical axis represents stress, and stress is represented by σ.e This indicates that the engineering stress-strain curve before the peak point is the test curve corresponding to the elastic stage in the engineering stress-strain curve.

[0110] S1004, obtain the true stress-strain curve of the plastic stage in the corresponding test curve.

[0111] In this embodiment, the corresponding experimental curve can be converted into a true stress-strain curve using the first stress formula and the first strain formula. Specifically, the first stress formula uses σ t It means that σ t Satisfy the following formula: σ t =σ e (1+ε e The first strain formula uses ε t It means that ε t Satisfy the following formula: ε t =ln(1+ε e For example, combining Figure 11 ,like Figure 12 As shown, a schematic diagram of a real stress-strain curve is provided.

[0112] Furthermore, the true stress-strain curve can be converted into a plastic true stress-strain curve using the second strain formula. Specifically, the second strain formula uses ε p It means that ε p Satisfy the following formula: Where, σ necking Where E is the necking stress and E is the elastic modulus, for example, combining Figure 12 ,like Figure 13 As shown, a schematic diagram of a true plastic stress-strain curve is provided.

[0113] S1006, extrapolate the true stress curve of plastic strain to obtain the extrapolated true stress curve of plastic strain.

[0114] In this embodiment, the true stress curve of plastic strain can be processed by a hardening formula to obtain an extrapolated true stress curve of plastic strain. Specifically, the hardening formula uses σ T It means that σ T Satisfy the following formula:

[0115]

[0116] Where σ0 is the stress without plastic strain, ε is slightly greater than the ultimate stress at high plastic strain. op And β is a parameter that determines the average plastic strain and strain range, δ is a parameter that describes the stress drop after the stress peaks, and ε sp This represents the plastic strain at which the stress is minimized.

[0117] For example, combining Figure 13 ,like Figure 14 As shown, a schematic diagram of an extrapolated true stress curve of plastic strain is provided, combined with... Figure 14 and Figure 13 It can be seen that the extrapolated plastic strain true stress curve is the curve obtained by extending the plastic true stress-strain curve in the direction of the horizontal axis; among them, the extrapolated plastic strain true stress curve can be the curve corresponding to the extension of the plastic true stress-strain curve to the strain of 3.

[0118] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0119] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0120] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0121] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0122] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A type of grille, characterized in that, The grille has a long strip structure, and the cross-section of the grille has a preset shape. The cross-section of the grille and the target structural parameters corresponding to the preset shape type satisfy the relationship between the preset structural parameters that match the material type and the preset shape type of the grille; The preset shape type is hexagonal, and the target structural parameters include: the length of the first side of the hexagon, the length of the second side of the hexagon, the length of the center line segment, the distance between the first side and the center line segment, and the distance between the center line segment and the second side; wherein the length of the center line segment is greater than the length of the first side, the length of the center line segment is greater than the length of the second side, the first side is located on the first surface of the grille, the second side is located on the second surface of the grille, the center line segment is parallel to the first side and the second side, and the two endpoints corresponding to the center line segment are the vertices of the hexagon; The relationships between the preset structural parameters are represented by a functional relationship, which is expressed as follows: Among them, the The length of the first side, the The length of the second side, the The length of the center line segment, the The distance between the first side and the center line segment is... The distance between the center line segment and the second side is denoted as .

2. The grille according to claim 1, characterized in that, The material type of the grille is PP-GF23. It is -0.

11. It is -0.

16. It is -0.

112. It is -0.

061. It is 0.

006. It is -0.

004. It is 0.0225. It is 0.

006. It is 0.

013. It is 0.

003. It is 1.

013.

3. The grille according to claim 2, characterized in that, The calibration structure failure value is 0.

25.

4. The grille according to claim 1, characterized in that, The material type of the grille is PBT-GF30_FR. It is -0.

2. It is -0.

1. It is -0.

03. It is -0.

042. It is 0.

001. It is -0.

007. It is 0.

016. It is 0.0015. It is 0.

032. It is 0.

004. It is 0.

83.

5. The grille according to claim 4, characterized in that, The calibration structure failure value is 0.

2.

6. The grille according to claim 1, characterized in that, The material type of the grille is PP-HG-HR. It is -0.

3. It is -0.

21. It is -0.

026. It is -0.

037. It is 0.0018. It is -0.0045. It is 0.

021. It is 0.0023. It is 0.

027. It is 0.0031. It is 1.

33.

7. The grille according to claim 6, characterized in that, The calibration structure failure value is 0.

32.

8. The grille according to claim 1, characterized in that, The length of the first side is greater than 0.7 mm and less than 2.5 mm.

9. The grille according to claim 1, characterized in that, The length of the center line segment is greater than or equal to 2 mm, and the length of the center line segment is less than or equal to 3 mm.

10. The grille according to claim 1, characterized in that, The difference between the distance between the first side and the center line segment and the first value is within a first preset range, and the first value is the value obtained by multiplying the first preset value by the distance between the center line segment and the second side.

11. The grille according to claim 10, characterized in that, The first preset value is .

12. The grille according to claim 10, characterized in that, The first preset value is .

13. The grille according to claim 1, characterized in that, The difference between the product of the length of the center line segment and the second preset value and the second value is within a second preset range. The second value is the sum of the distance between the first side and the center line segment and the distance between the center line segment and the second side.

14. The grille according to any one of claims 8 to 13, characterized in that, The area of ​​the hexagon is greater than or equal to 15 mm². 2 .

15. A household appliance, characterized in that, The household appliance includes a grille as described in any one of claims 1 to 14.

16. The household appliance according to claim 15, characterized in that, The household appliances include at least one of the following: a fan, an electric heater, or a rice cooker.

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