Stainless steel plate friction surface anti-slip coefficient calculation method based on anti-slip coating treatment

Abstract

The invention relates to a stainless steel plate friction surface anti-slip coefficient calculation method based on anti-slip coating treatment. The method is suitable for the technical field of material science and engineering application. According to the technical scheme, the method comprises the steps that the thickness of anti-skid paint is obtained; inputting the thickness of the anti-slip coating into the anti-slip coefficient prediction model to obtain an anti-slip coefficient corresponding to the thickness of the anti-slip coating; the construction method of the anti-slip coefficient prediction model comprises the following steps: acquiring the anti-slip bearing capacity of each stainless steel plate-high-strength bolt tension test piece under various anti-slip coating thicknesses, and the bolt pre-tightening force of the stainless steel plate-high-strength bolt tension test piece when the high-strength bolt slides; determining an anti-slip coefficient based on the anti-slip bearing capacity of the stainless steel plate-high-strength bolt tension test piece and the bolt pre-tightening force when the high-strength bolt in the stainless steel plate-high-strength bolt tension test piece slips; and based on the thickness of the anti-slip coating and the anti-slip coefficient, fitting to obtain an anti-slip coefficient prediction model.

Description

Technical Field

[0001] The invention relates to a method for calculating the anti-slip coefficient of the friction surface of a stainless steel plate treated with an anti-slip coating, and is applicable to the technical field of material science and engineering application. Background Art

[0002] High-strength bolt connections have reliable force transmission and high safety redundancy, and are widely used in bolt connections of steel structures. The shear connection of high-strength bolts clamps the connected steel plates through the preload force generated by tightening the high-strength bolts, and conducts force flow through the contact surface between the steel plates via anti-slip friction. Therefore, the anti-slip coefficient of the friction surface between the connected steel plates is a key factor restricting the shear bearing capacity of high-strength bolts. At present, the requirements for the anti-slip coefficient of the steel plate surface in the general steel structure specifications are greater than 0.40. However, for stainless steel structures, using conventional surface treatment methods such as sandblasting and shot blasting, the anti-slip coefficient of the stainless steel plate surface can only reach about 0.20, resulting in a low bearing capacity of stainless steel high-strength bolt connections, and the material properties cannot be fully utilized, resulting in waste.

[0003] Existing studies have explored the high anti-slip coefficient friction surface of stainless steel plates, including surface mechanical meshing, thermal spraying of stainless steel powder, spraying of anti-slip coatings, etc. Among them, spraying anti-slip coatings is the simplest method to manufacture and process, works in room temperature, does not require cumbersome machining processes, and is easy to promote. However, the current research on the anti-slip coefficient of the friction surface of stainless steel plates treated with anti-slip coatings is still incomplete, and the effects of the characteristics of the anti-slip coating itself and the coating thickness on the slip coefficient are still unclear, which can lead to incorrect assessments during connection design and pose safety hazards.

[0004] Therefore, it is necessary to conduct a detailed analysis and study on the anti-slip coefficient of the friction surface of the stainless steel plate treated with anti-slip coating, and to conduct a quantitative analysis of the specimens treated with anti-slip coatings of different thicknesses, in order to provide a reference for the application of stainless steel high-strength bolt connections. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in view of the above-mentioned existing problems, a method for calculating the anti-slip coefficient of the friction surface of a stainless steel plate treated with an anti-slip coating is provided.

[0006] The technical solution adopted by the present invention is: a method for calculating the anti-slip coefficient of the friction surface of a stainless steel plate treated with an anti-slip coating, characterized by comprising:

[0007] Get the thickness of the anti-slip coating;

[0008] Inputting the anti-skid coating thickness into the anti-skid coefficient prediction model to obtain the anti-skid coefficient corresponding to the anti-skid coating thickness;

[0009] The method for constructing the anti-slip coefficient prediction model comprises:

[0010] Obtain the anti-slip bearing capacity of each stainless steel plate-high-strength bolt tensile test specimen under various anti-slip coating thicknesses, as well as the bolt preload when the high-strength bolt in the stainless steel plate-high-strength bolt tensile test specimen slips;

[0011] The anti-slip coefficient is determined based on the anti-slip bearing capacity of the stainless steel plate-high-strength bolt tensile specimen and the bolt preload when the high-strength bolt in the stainless steel plate-high-strength bolt tensile specimen slips.

[0012] Based on the anti-slip coating thickness and the anti-slip coefficient, the anti-slip coefficient prediction model was fitted.

[0013] The anti-slip coefficient prediction model includes:

[0014] μ=c-ae -bt

[0015] Among them, μ is the anti-slip coefficient of the stainless steel plate-high-strength bolt tensile specimen, t is the thickness of the anti-slip coating, and a, b and c are coefficients.

[0016] The anti-slip coefficient is determined based on the anti-slip bearing capacity of the stainless steel plate-high-strength bolt tension test piece and the bolt preload when the high-strength bolt in the stainless steel plate-high-strength bolt tension test piece slips, including:

[0017]

[0018] Where, μ is the anti-slip coefficient of the stainless steel plate-high-strength bolt tensile test specimen, N v is the sliding load of the stainless steel plate-high-strength bolt tensile specimen, n f is the number of friction surfaces of the steel plate in the stainless steel plate-high-strength bolt tensile test specimen, ΣP i It is the sum of the bolt preload forces on the sliding side of the stainless steel plate-high-strength bolt tensile specimen.

[0019] A device for calculating the anti-slip coefficient of the friction surface of a stainless steel plate treated with an anti-slip coating, characterized by comprising:

[0020] A thickness acquisition module is used to obtain the thickness of the anti-slip coating;

[0021] A model prediction module, used for inputting the anti-skid coating thickness into the anti-skid coefficient prediction model to obtain the anti-skid coefficient corresponding to the anti-skid coating thickness;

[0022] The method for constructing the anti-slip coefficient prediction model comprises:

[0023] Obtain the anti-slip bearing capacity of each stainless steel plate-high-strength bolt tensile test specimen under various anti-slip coating thicknesses, as well as the bolt preload when the high-strength bolt in the stainless steel plate-high-strength bolt tensile test specimen slips;

[0024] The anti-slip coefficient is determined based on the anti-slip bearing capacity of the stainless steel plate-high-strength bolt tensile specimen and the bolt preload when the high-strength bolt in the stainless steel plate-high-strength bolt tensile specimen slips.

[0025] Based on the anti-slip coating thickness and the anti-slip coefficient, the anti-slip coefficient prediction model was fitted.

[0026] A storage medium stores a computer program that can be executed by a processor, characterized in that when the computer program is executed, the steps of the method for calculating the anti-slip coefficient of the friction surface of a stainless steel plate treated with an anti-slip coating are implemented.

[0027] A device for calculating an anti-slip coefficient comprises a memory and a processor, wherein the memory stores a computer program that can be executed by the processor, and wherein the device is characterized in that when the computer program is executed, the steps of the method for calculating the anti-slip coefficient of the friction surface of a stainless steel plate treated with an anti-slip coating are implemented.

[0028] The beneficial effects of the present invention are as follows: the present invention determines the anti-slip coefficient based on the anti-slip bearing capacity and the bolt preload, thereby determining the corresponding relationship between the anti-slip coating thickness and the anti-slip coefficient, and obtains an anti-slip coefficient prediction model based on the corresponding relationship between the anti-slip coating thickness and the anti-slip coefficient. The model has a simple form and is easy to apply. It only requires a given anti-slip coating thickness to obtain the anti-slip coefficient of the stainless steel plate bolt connection under different surface treatment conditions.

[0029] The anti-slip coefficient prediction model of the present invention can clarify and quantify the influence and sensitivity of the anti-slip effect of the coating on the anti-slip performance of the friction surface of the steel plate.

[0030] The anti-slip coefficient prediction model in the present invention takes into account the mutual mechanical effect between the stainless steel plate and the bolt, as well as the action mechanism and durability of the anti-slip coating. At the same time, based on the regression analysis and processing of the anti-slip coefficient data of the stainless steel plate-high-strength bolt tensile specimen, the prediction accuracy of the anti-slip coefficient of the stainless steel plate bolt connection in actual engineering is higher and the applicability is stronger.

[0031] The method for calculating the anti-slip coefficient of bolted connection of stainless steel plates in the present invention can intuitively show the influence of the anti-slip effect on the anti-slip performance of the tensile test piece under different anti-slip coating thicknesses, and can quickly judge the growth trend of the anti-slip effect from the anti-slip coefficient prediction model numerical value.

[0032] The present invention determines the anti-slip coefficient corresponding to the thickness of the anti-slip coating through an anti-slip coefficient prediction model, avoiding complex and inefficient contact modeling, numerical calculations and a large number of repetitive qualitative comparison tests of the coating-steel plate composite structure. According to this method, the anti-slip coefficient of the friction surface of the stainless steel plate under different anti-slip coating treatments can be conveniently and quickly calculated, and the shear bearing capacity of the bolt connection of the stainless steel structure can be designed based on this, helping structural designers to evaluate the service safety level of stainless steel bolt connection nodes and structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the anti-slip coating layer in the embodiment.

[0034] Figure 2 Schematic diagram of the stainless steel plate-high-strength bolt tensile test piece in the embodiment.

[0035] Figure 3 It is a prediction model of the anti-slip coefficient of the friction surface of the stainless steel plate treated with anti-slip coating in the embodiment.

[0036] Figure 4 This is a comparison chart of the anti-slip coefficient test results and the predicted results of the austenitic stainless steel plate treated with the anti-slip coating in the embodiment. DETAILED DESCRIPTION

[0037] Embodiment 1: This embodiment is a method for calculating the anti-slip coefficient of the friction surface of a stainless steel plate treated with an anti-slip coating, which specifically includes the following steps:

[0038] S1. Obtain the thickness of the anti-slip coating;

[0039] S2. Input the anti-skid coating thickness into the anti-skid coefficient prediction model to obtain the anti-skid coefficient corresponding to the anti-skid coating thickness.

[0040] The method for constructing the anti-slip coefficient prediction model in this embodiment includes:

[0041] A. Obtain the anti-slip bearing capacity of each stainless steel plate-high-strength bolt tensile specimen under various anti-slip coating thicknesses, as well as the bolt preload when the high-strength bolt in the stainless steel plate-high-strength bolt tensile specimen slips.

[0042] In this example, when making the stainless steel plate-high-strength bolt tensile test piece, the surface of the stainless steel plate is first treated with an anti-slip coating to obtain a friction surface with a high anti-slip coefficient; then the stainless steel plate and the high-strength bolt are assembled to obtain the stainless steel plate-high-strength bolt tensile test piece.

[0043] Schematic diagram of the anti-slip coating layer on the surface of the stainless steel plate Figure 1As shown, the anti-skid coating is an inorganic zinc-rich anti-rust and anti-skid coating. The surface construction process is as follows: first, the surface of the stainless steel plate is sandblasted to make the surface roughness reach Rz30μm, and then the anti-skid coating is sprayed at room temperature. The coating appearance should be uniform and smooth without defects such as sagging, dripping, orange peel, and cracking.

[0044] Figure 2 This is a schematic diagram of the tensile specimen structure corresponding to the test part in this example (unit: mm). The tensile specimen is assembled from a stainless steel plate with anti-slip coating on the contact surface and stainless steel high-strength bolts; the contact surface is a double friction surface, and there are two bolts on one side. In the tensile test of the tensile specimen, the steel plate is subjected to tension and the bolts are subjected to shear, which is similar to the stress conditions of the actual stainless steel structure connection node. It should be noted that Figure 2 The form and structure of the tensile test piece shown should not be understood as a unique limitation on the tensile test piece of this embodiment. Theoretically, similar bolted shear connections are applicable.

[0045] After the stainless steel plate-high-strength bolt tensile test piece is assembled (bolt tightening is completed), the ultrasonic non-destructive measurement method is immediately used to monitor the bolt preload, and a monotonic tensile test is performed. After the test is completed, the average value Pi of the bolt preload monitored during the entire process is taken. If the bolt preload fluctuates greatly, the test data of this group should be considered invalid and the test should be repeated.

[0046] In this embodiment, the anti-slip coating thickness of each stainless steel plate-high-strength bolt tensile test piece is measured by a non-contact paint film meter, and the density of the measuring points is not less than 100 / m 2 , and take the average value of all measuring points as the final anti-slip coating thickness.

[0047] B. Determine the anti-slip coefficient based on the anti-slip bearing capacity of the stainless steel plate-high-strength bolt tension specimen and the bolt preload when the high-strength bolt slips in the stainless steel plate-high-strength bolt tension specimen.

[0048] The anti-slip coefficient of the stainless steel plate-high-strength bolt tensile test specimen under different anti-slip coating thicknesses is calculated by the following formula:

[0049]

[0050] Where μ is the anti-slip coefficient of the stainless steel plate-high-strength bolt tensile test specimen treated with anti-slip coating on the surface, N v Slip load of the tensile specimen under anti-slip treatment, n f The number of friction surfaces of the steel plate in the tensile test piece for anti-slip treatment is double friction surfaces in this embodiment, n f =2, In order to prevent slipping, the sum of the bolt pre-tightening forces on the sliding side of the tension specimen is taken into account. In this embodiment, a double-bolt specimen is used, and m=2.

[0051] C. Based on the thickness of the anti-slip coating and the anti-slip coefficient, the anti-slip coefficient prediction model is fitted. By analyzing the test results, considering the mutual mechanical effect between the stainless steel plate and the bolt and the action mechanism and durability of the anti-slip coating, based on the regression analysis of the anti-slip coefficient data of the stainless steel plate-high-strength bolt tensile specimen, a prediction model for the anti-slip coefficient of the friction surface of the stainless steel plate treated with anti-slip coating is given.

[0052] The test parameters and test results of the tensile test specimens are shown in Table 1. The table includes the anti-slip coating thickness, anti-slip bearing capacity, outer bolt preload, inner bolt preload and anti-slip coefficient.

[0053] Table 1 Summary of tensile test results of stainless steel plate-high-strength bolt tensile specimens

[0054]

[0055] Note: The specimen number S-120-1 in the table indicates the first specimen of the parallel test of stainless steel plate-high-strength bolt tensile test specimens with an anti-slip coating thickness of 120μm.

[0056] In this embodiment, it is found through data analysis that the anti-slip coefficient prediction model of the friction surface of the stainless steel plate under different anti-slip coating thickness conditions is nonlinear, such as Figure 3 The points in the figure are test data, and the solid line is the anti-slip coefficient prediction model of the friction surface of the stainless steel plate under different anti-slip coating thickness conditions, specifically:

[0057] μ=c-ae -bt

[0058] Wherein, μ is the anti-slip coefficient of the stainless steel plate-high-strength bolt tensile test piece, t is the thickness of the anti-slip coating, a, b and c are the coefficient values ​​obtained by fitting the tensile test results of the stainless steel plate-high-strength bolt tensile test piece according to the least square method through computer programming. In this embodiment, a=0.312, b=0.015, c=0.515.

[0059] The anti-slip coefficient prediction model of the friction surface of the stainless steel plate under different anti-slip treatment conditions in this embodiment can reflect the effect of the thickness of the anti-slip coating on the shear performance of the stainless steel plate. When the thickness of the anti-slip coating is small, the anti-slip effect is poor and the anti-slip coefficient is still very small; when the thickness of the anti-slip coating is too large, the anti-slip effect reaches saturation and the increase in the anti-slip coefficient is no longer significant. Therefore, it is necessary to determine a suitable anti-slip coating thickness that meets the requirements of both force performance and economic performance. In this embodiment, the suitable coating structure thickness range is 120±40μm, preferably 120-150μm.

[0060] From the process of obtaining the anti-slip coefficient prediction model of the friction surface of the stainless steel plate under different anti-slip treatment conditions, it can be seen that the data of the model in this example is directly derived from the test data of the bolt tensile specimen. The test object in the test is the bolt connection specimen. The force on the specimen will inevitably bring about contact surface extrusion and force transmission between the bolt and the stainless steel plate. That is, this embodiment takes into account the mechanical synergy between the stainless steel plate and the bolt, that is, the mutual friction and mechanical action between the two. Therefore, the prediction accuracy of the anti-slip performance of the bolt connection of the stainless steel structure in the actual engineering is higher and the applicability is stronger.

[0061] After the anti-slip coefficient prediction model of the stainless steel plate friction surface under different anti-slip treatment conditions is established, the calculated value of the anti-slip coefficient of the corresponding stainless steel plate friction surface under different anti-slip treatment conditions can be obtained by substituting the given anti-slip coating thickness into the model.

[0062] In order to verify the accuracy of the method of this embodiment for predicting and calculating the anti-slip coefficient of the friction surface of the stainless steel plate treated with anti-slip coating, the anti-slip coefficient test results of the stainless steel plate-high-strength bolt tension test piece were compared with the predicted results using the method of this embodiment. Figure 4 As shown in the figure, the solid line is the 1:1 ratio line. If the data points of the anti-slip coefficient of the tensile specimen under different surface anti-slip treatment conditions are on this line, it indicates that the predicted result is equal to the test result. The dotted line in the figure is the 1:1.1 times dispersion area ratio line. If the data points of the anti-slip coefficient of the tensile specimen under different surface anti-slip treatment conditions are on this line, it indicates that the ratio of the predicted result to the test result is 1:1.1.

[0063] Depend on Figure 4 It can be seen that all the prediction results are located in the 1:1.1 times dispersion area of ​​the test results, and most of the prediction results are basically located near the 1:1 ratio line of the test results, indicating that the method of the present invention has good accuracy.

[0064] Embodiment 2: This embodiment is a device for calculating the anti-slip coefficient of the friction surface of a stainless steel plate treated with anti-slip coating, comprising: a thickness acquisition module and a model prediction module, etc., wherein the thickness acquisition module is used to obtain the thickness of the anti-slip coating; the model prediction module is used to input the thickness of the anti-slip coating into the anti-slip coefficient prediction model to obtain the anti-slip coefficient corresponding to the thickness of the anti-slip coating.

[0065] The method for constructing the anti-slip coefficient prediction model in this embodiment includes:

[0066] Obtain the anti-slip bearing capacity of each stainless steel plate-high-strength bolt tensile test specimen under various anti-slip coating thicknesses, as well as the bolt preload when the high-strength bolt in the stainless steel plate-high-strength bolt tensile test specimen slips;

[0067] The anti-slip coefficient is determined based on the anti-slip bearing capacity of the stainless steel plate-high-strength bolt tensile specimen and the bolt preload when the high-strength bolt in the stainless steel plate-high-strength bolt tensile specimen slips.

[0068] Based on the anti-slip coating thickness and the anti-slip coefficient, the anti-slip coefficient prediction model was fitted.

[0069] Embodiment 3: This embodiment is a storage medium on which a computer program that can be executed by a processor is stored. When the computer program is executed, the steps of the method for calculating the anti-slip coefficient of the friction surface of a stainless steel plate treated with an anti-slip coating in Embodiment 1 are implemented.

[0070] Embodiment 4: This embodiment is an anti-slip coefficient calculation device, which has a memory and a processor. The memory stores a computer program that can be executed by the processor. When the computer program is executed, the steps of the anti-slip coefficient calculation method of the friction surface of a stainless steel plate treated with anti-slip coating in Embodiment 1 are implemented.

Claims

1. A method for calculating the anti-slip coefficient of the friction surface of a stainless steel plate treated with an anti-slip coating, characterized in that: include: Get the thickness of the anti-slip coating; Inputting the anti-skid coating thickness into the anti-skid coefficient prediction model to obtain the anti-skid coefficient corresponding to the anti-skid coating thickness; The method for constructing the anti-slip coefficient prediction model comprises: Obtain the anti-slip bearing capacity of each stainless steel plate-high-strength bolt tensile test specimen under various anti-slip coating thicknesses, as well as the bolt preload when the high-strength bolt in the stainless steel plate-high-strength bolt tensile test specimen slips; The anti-slip coefficient is determined based on the anti-slip bearing capacity of the stainless steel plate-high-strength bolt tensile specimen and the bolt preload when the high-strength bolt in the stainless steel plate-high-strength bolt tensile specimen slips. Based on the anti-slip coating thickness and the anti-slip coefficient, the anti-slip coefficient prediction model was fitted.

2. The method for calculating the anti-slip coefficient of the friction surface of a stainless steel plate treated with an anti-slip coating according to claim 1, characterized in that: The anti-slip coefficient prediction model includes: μ=c-ae -bt Among them, μ is the anti-slip coefficient of the stainless steel plate-high-strength bolt tensile specimen, t is the thickness of the anti-slip coating, and a, b and c are coefficients.

3. The method for calculating the anti-slip coefficient of the friction surface of a stainless steel plate treated with an anti-slip coating according to claim 1, characterized in that: The anti-slip coefficient is determined based on the anti-slip bearing capacity of the stainless steel plate-high-strength bolt tension test piece and the bolt preload when the high-strength bolt in the stainless steel plate-high-strength bolt tension test piece slips, including: Where, μ is the anti-slip coefficient of the stainless steel plate-high-strength bolt tensile test specimen, N v is the sliding load of the stainless steel plate-high-strength bolt tensile specimen, n f is the number of friction surfaces of the steel plate in the stainless steel plate-high-strength bolt tensile test specimen, ΣP i It is the sum of the bolt preload forces on the sliding side of the stainless steel plate-high-strength bolt tensile specimen.

4. A device for calculating the anti-slip coefficient of the friction surface of a stainless steel plate treated with an anti-slip coating, characterized in that: include: A thickness acquisition module is used to obtain the thickness of the anti-slip coating; A model prediction module, used for inputting the anti-skid coating thickness into the anti-skid coefficient prediction model to obtain the anti-skid coefficient corresponding to the anti-skid coating thickness; The method for constructing the anti-slip coefficient prediction model comprises: Obtain the anti-slip bearing capacity of each stainless steel plate-high-strength bolt tensile test specimen under various anti-slip coating thicknesses, as well as the bolt preload when the high-strength bolt in the stainless steel plate-high-strength bolt tensile test specimen slips; The anti-slip coefficient is determined based on the anti-slip bearing capacity of the stainless steel plate-high-strength bolt tensile specimen and the bolt preload when the high-strength bolt in the stainless steel plate-high-strength bolt tensile specimen slips. Based on the anti-slip coating thickness and the anti-slip coefficient, the anti-slip coefficient prediction model was fitted.

5. A storage medium having stored thereon a computer program executable by a processor, characterized in that: When the computer program is executed, the steps of the method for calculating the anti-slip coefficient of the friction surface of a stainless steel plate treated with an anti-slip coating according to any one of claims 1 to 3 are implemented.

6. An anti-slip coefficient calculation device, comprising a memory and a processor, wherein the memory stores a computer program executable by the processor, characterized in that: When the computer program is executed, the steps of the method for calculating the anti-slip coefficient of the friction surface of a stainless steel plate treated with an anti-slip coating according to any one of claims 1 to 3 are implemented.

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