Design method of anti-torsion structure of casual sports shoe sole and obtained shoe

Abstract

The invention belongs to the field of computer aided design, and provides a design method for a torsion-resistant structure of a leisure sports shoe sole and an obtained shoe, and the method comprises the following steps: obtaining a three-dimensional shoe model; performing grid division on the three-dimensional shoe model through a grid division algorithm to obtain a shoe finite element model; identifying a midsole area of the shoe finite element model and segmenting the shoe finite element model; performing deformity concentration analysis according to the obtained toe area finite element model to obtain a deformity concentration area; and marking the position, corresponding to the three-dimensional shoe model, of the distorted concentrated area. According to the design method provided by the embodiment of the invention, the comfort, the thermal management capability and the torsion resistance of the shoes in the movement process can be improved by accurately positioning the distorted concentrated area, analyzing the temperature difference and carrying out local optimization by adopting the graphene composite material.

Description

Technical Field

[0001] The invention belongs to the field of computer-aided design, and in particular relates to a design method for a torsion-resistant structure of a leisure sports shoe sole and the obtained shoe. Background Art

[0002] The Chinese patent publication number CN113971333A, "Method and Design Method for Establishing Shoe Component Model", proposes a method for obtaining high-quality shoe component models through positioning technology. This method can accurately restore the structure and detail effects of the actual shoe through advanced 3D modeling and scanning technology, generate a high-resolution three-dimensional digital model, and provide a reliable data basis for shoe design. However, in practical applications, this method still has certain limitations, especially in the following key areas: although it can highly restore the shoe structure, it lacks the function of in-depth analysis and optimization design for the deformation and stress distribution of the shoe in dynamic use; this may cause local fatigue or damage to the shoe during high-intensity exercise; and the method fails to fully consider the mechanical properties of the sole under sports impact, especially in the design of the torsion area of ​​the sole. The lack of precise optimization of high-pressure points and impact distribution may cause foot discomfort or material degradation after long-term use; and with the increase in exercise, the shoe parts, especially the sole area, will generate a lot of heat due to friction and repeated stress, but the existing design method does not pay enough attention to thermal expansion and temperature management, and fails to effectively solve the problem of material deformation and performance degradation caused by high temperature.

[0003] In summary, although the method of CN113971333A has significant advantages in constructing a fine three-dimensional model, it still needs to be further improved in dynamic mechanical performance analysis, material thermal performance treatment, torsion resistance improvement and pressure uniform distribution. These deficiencies are particularly evident in sports shoes and high-intensity use shoes, and they urgently need to be improved through the application of new materials and design optimization technology to meet the complex needs of modern footwear usage scenarios. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first object of the present invention is to propose a method for designing a torsion-resistant structure of a leisure sports shoe sole, which can improve the comfort, thermal management ability and torsion-resistant performance of the shoe during exercise by accurately locating the concentrated area of ​​distortion, temperature difference analysis and local optimization using graphene composite materials; To achieve the above-mentioned object, a first embodiment of the present invention provides a method for designing a torsion-resistant structure of a leisure sports shoe sole, the method comprising the following steps: S100, obtaining a three-dimensional shoe model; S200, loading the three-dimensional shoe model into finite element analysis software, meshing the three-dimensional shoe model using a meshing algorithm, and obtaining a shoe finite element model; S300, identifying a midsole region of a shoe finite element model and segmenting the shoe finite element model to obtain a midsole region finite element model, and recording a toe portion of the midsole region finite element model as a toe region finite element model; S400, performing a distortion concentration analysis based on the obtained finite element model of the toe region to obtain a distortion concentration region; S500: Mark the position of the three-dimensional shoe model corresponding to the distortion concentration area.

[0005] According to the design method of the embodiment of the present invention, the comfort, thermal management ability and torsional resistance of the shoe during exercise can be improved by accurately locating the concentrated distortion area, temperature difference analysis and local optimization using graphene composite materials.

[0006] Furthermore, in step S100, the method for acquiring the three-dimensional shoe model includes: using 3D scanning technology (laser scanning or optical scanning) to digitize the shoe to obtain its three-dimensional image data; after acquiring the model, converting it into STL format so as to remove noise, repair cracks and simplify geometry in the analysis software to ensure the quality and accuracy of the model, and defining functional information such as material properties, contact conditions and boundary conditions for the model so as to perform effective simulation in finite element analysis; finally, importing the prepared three-dimensional shoe model into the finite element analysis software to prepare for the next step of meshing and performance analysis.

[0007] In step S200, the three-dimensional shoe model is loaded into the finite element analysis software, and the three-dimensional shoe model is meshed by a meshing algorithm to obtain a tetrahedral mesh in the shoe finite element model.

[0008] The deformation of the sole refers to the uneven deformation or damage of the sole under long-term movement, impact or thermal changes. This will lead to a decrease in the comfort and performance of the shoe, especially in areas that are subject to greater pressure or high temperature (such as the toe part); traditional sole materials often cannot effectively disperse pressure or regulate temperature in these areas, resulting in deformation or damage. In order to solve this problem, the present invention proposes step S300; In step S300, the midsole area of ​​the shoe finite element model is identified and the shoe finite element model is segmented to obtain the midsole area finite element model, and the toe part of the midsole area finite element model is recorded as the toe area finite element model.

[0009] Specifically, the method for obtaining the finite element model of the midsole area is as follows: identifying the finite element model of the midsole area of ​​the sole through geometric analysis and material property analysis, and determining its boundary using an algorithm of interest; segmenting the model and extracting the finite element model of the midsole area.

[0010] Furthermore, the method for obtaining the finite element model of the toe area is to identify the front area that is subjected to impact and pressure, namely the toe area, through finite element stress gradient and pressure distribution analysis, combined with the mechanical behavior of the shoe in static standing and running simulations. Based on these mechanical characteristics, the local mesh encryption and mesh area extraction methods are used to accurately extract the finite element model of the toe area; Furthermore, since sports shoes generate a lot of heat due to impact and friction during use, especially during high-intensity exercise (such as running), the temperature of the sole increases. If the thermal management of the sole is insufficient, the excessive temperature will cause the material to expand, soften or chemically degrade, ultimately affecting the structure and comfort of the shoe. In order to solve the above problem, the present invention proposes step S400; In step S400, a distortion concentration analysis is performed based on the obtained toe area finite element model, and the distortion concentration area is obtained, including: S401, simulating the torsion and bending state of the casual shoe sole during movement by using dynamic simulation software in finite element analysis software; The dynamic simulation software in the finite element analysis software is used to simulate the torsion and bending state of the casual shoe sole in motion, collect data and perform iterative optimization, including determining the sole material properties and geometric parameters, and then perform the sole bending / torsion dynamics simulation to capture the deformation of the sole in different motion states, simulate the heel of the sole being pressed, and apply an oblique upward force to the toe to simulate the bending state in actual motion, and record the relevant deformation parameters, analyze the characteristics of the sole deformation in wave form, and record the stress concentration location to determine the area of ​​the sole that needs to be strengthened. Through this process, the mechanical behavior of the shoe in different situations can be accurately simulated, providing detailed numerical support for subsequent analysis.

[0011] S402, obtaining an unstable pressure range, and obtaining an anti-torsion distortion region through the unstable pressure range; LEss(i) represents the pressure value of the grid in the i-th toe area finite element model, where i∈[1,n], where n is the number of grids in the toe area finite element model, where the pressure value of the grid is the average value of the pressure in the entire grid; the grids in the toe area finite element model are classified to obtain an unstable pressure range and an unstable pressure value range; the pressure LEss(i) of the grid of the toe area finite element model is obtained as a pressure sequence LEK, and the pressure sequence LEK is composed of n pressures, namely {LEss(1), LEss(2), ..., LEss(n)}, LEss(i) is the i-th pressure in the pressure sequence LEK, i is a sequence number, and the value range of i is i=1, 2, ..., n, the average value of all pressures in the pressure sequence LEK is obtained, and the standard deviation of the pressures in the pressure sequence LEK is obtained; Furthermore, the pressure sequence is internally classified by the standard deviation of the pressure in the pressure sequence LEK; the pressure greater than the mean plus the standard deviation is classified as an unstable pressure range; The pressure ranges of the unstable pressure sequence range are recorded as [a, b], where a is the minimum value of the unstable pressure range and b is the maximum value of the unstable pressure range.

[0012] Calculate the average value of a and b and record it as v; record [v, b] as the abnormal pressure range.

[0013] The area composed of meshes with pressure in the abnormal pressure range [v, b] in all toe zone finite element models is recorded as the torsional distortion resistance area; Among them, the torsional distortion area refers to the area in the shoe design where the material is deformed (distorted) due to external pressure, impact or friction. In this method, the abnormal pressure range obtained by pressure analysis in the toe area (i.e. the toe part) is determined as the torsional distortion area. The "distortion" here refers to the phenomenon that the material changes in shape due to long-term or short-term excessive pressure, temperature changes and other factors. The torsional distortion area pays special attention to areas with greater impact, such as the position where the foot is subjected to the greatest force when running. These areas need to be specially designed to enhance torsional resistance and shock absorption performance.

[0014] S403, performing temperature analysis on the torsional distortion region to obtain distortion trend lines; wherein the distortion trend lines include a first distortion trend line, a second distortion trend line and a third distortion trend line.

[0015] Specifically, take the center points Doit1 and Doit2 of the two farthest grids in the anti-torsion distortion area, record the line segment between Doit1 and Doit2 as the first distortion trend line L1, and take the midpoint Doit3 of L1; determine the center point of the grid with a pressure value of b in the anti-torsion distortion area; then calculate the distances between the center points of these grids, find the longest distance, and mark the midpoint of this longest distance as Doit4. If only one grid in the anti-torsion distortion area has a pressure value of b, then record the center point of the grid with the pressure value of b as Doit4; determine the center point of the grid with a pressure value of a in the anti-torsion distortion area. Then calculate the distances between the center points of these grids, find the longest distance, and mark the midpoint of this longest distance as Doit5. If only one grid in the anti-torsion distortion area has a pressure value of a, then record the center point of the grid with the pressure value of a as Doit5; record the line segment between Doit3 and Doit4 as the second distortion trend line L2, and the line segment between Doit3 and Doit5 as the third distortion trend line L3.

[0016] Among them, the distortion trend line is a line reflecting the distortion trend drawn by analyzing the thermal stress and pressure distribution in the torsional distortion area. These lines indicate the edges with the most intense stress or heat in the torsional distortion area, and are used to locate the key positions of temperature change and thermal expansion. The distortion trend line can help designers identify which parts of the shoe are prone to excessive stress or thermal expansion during use, and then guide material optimization or local design.

[0017] The beneficial effect of this step is that during the use of sports shoes, the external impact force (such as the pedaling force when running) and friction force on the sole will generate heat, causing the sole temperature to rise. Since the thermal management principle points out that when the sole temperature is too high, the elastic modulus of the material may decrease, resulting in a decrease in the support and torsion resistance of the sole. Therefore, accurately predicting the temperature distribution and thermal expansion trend of the sole is crucial for design optimization. The distortion trend line can help designers identify areas with large temperature changes and areas with strong forces by combining temperature analysis and pressure distribution, so as to effectively manage heat and design materials for these areas, ensuring that the sole maintains sufficient comfort and performance during exercise.

[0018] S404, calculating the average temperature value of each point in the area formed by the first distortion trend line, the second distortion trend line and the third distortion trend line; The heat conduction simulation of the toe area finite element model is performed by finite element analysis software, and the temperature value of the grid in the toe area finite element model is obtained, wherein the temperature value of the grid is the average value of the temperature in the entire grid; The average temperature value of all the grids through which the first distortion trend line passes is Tp1, the average temperature value of all the grids through which the second distortion trend line passes is Tp2, and the average temperature value of all the grids through which the third distortion trend line passes is Tp3; S405, calculating a first distortion trend temperature difference, a second distortion trend temperature difference and a third distortion trend temperature difference by using average temperature values ​​of each point in the region formed by the first distortion trend line, the second distortion trend line and the third distortion trend line; Specifically, the first distortion trend temperature difference (△TEM1) is |Tp1−Tp2−Tp3|; wherein Tp1, Tp2, and Tp3 represent the grid average temperature of the first distortion trend line, the grid average temperature of the second distortion trend line, and the grid average temperature of the third distortion trend line, respectively. The second distortion trend temperature difference (△TEM2) is |Tp2−Tp3−Tp1|; the third distortion trend temperature difference (△TEM3) is |Tp3−Tp2−Tp1|; Among them, the distortion trend temperature difference refers to the temperature difference between different areas within the torsional distortion area; the size of the temperature difference reflects the degree of thermal change of the material at different positions. According to the temperature difference analysis, the areas with the most obvious thermal expansion can be identified. These areas may cause deformation under high temperature or pressure changes. The calculation of the distortion trend temperature difference can help designers understand which areas may be deformed due to excessive thermal stress, so as to optimize the design in a targeted manner.

[0019] S406, analyzing the relative sizes of the first distortion trend temperature difference, the second distortion trend temperature difference, and the third distortion trend temperature difference, and determining the distortion concentration area; Specifically, the method for judging and forming the distortion concentration area includes: when △TEM1≥△TEM2 and △TEM3≥△TEM2, it indicates that the first distortion trend temperature difference is the largest among the three temperature differences, and the second and third distortion trend temperature differences are relatively small; at this time, by connecting points Doit1, Doit2, Doit4, and Doit5, an area composed of points Doit1, Doit2, Doit4, and Doit5 is formed, and the area composed of points Doit1, Doit2, Doit4, and Doit5 is judged as the distortion concentration area; Further, when △TEM1≥△TEM2 and △TEM3<△TEM2, it indicates that the first distortion trend temperature difference is still large, but the third distortion trend temperature difference is smaller than the second distortion trend temperature difference. At this time, by connecting the points Doit1, Doit2, Doit3, and Doit5, an area composed of the points Doit1, Doit2, Doit3, and Doit5 is formed, and the area composed of the points Doit1, Doit2, Doit3, and Doit5 is determined to be a distortion concentration area.

[0020] Furthermore, when △TEM1<△TEM2 and △TEM3≥△TEM2, it indicates that the temperature difference of the second distortion trend is the largest, indicating that the area may be affected by a strong temperature change. By connecting points Doit1, Doit2, Doit3, and Doit4 to form an area composed of points Doit1, Doit2, Doit3, and Doit4, the area composed of points Doit1, Doit2, Doit3, and Doit4 is determined to be a distortion concentration area.

[0021] Furthermore, when △TEM1<△TEM2 and △TEM3<△TEM2: it indicates that the temperature differences of the second and third distortion trends are large. By connecting the points Doit2, Doit3, Doit4, and Doit5, an area composed of the points Doit2, Doit3, Doit4, and Doit5 is formed, and the area composed of the points Doit2, Doit3, Doit4, and Doit5 is determined to be a distortion concentration area.

[0022] Distortion concentration areas refer to areas that are determined by connecting key trend points by comparing different temperature difference values ​​in distortion trend analysis. This area is not only affected by thermal expansion, but also experiences frequent high impact or high pressure during the use of the shoe, causing material deformation or damage. Distortion concentration areas require special design and material treatment, such as stronger torsion-resistant materials or more high-temperature-resistant materials, to avoid product performance degradation due to excessive deformation.

[0023] The beneficial effect of this step is: by analyzing the temperature values ​​of the three distortion trend lines, the temperature difference between each line is calculated. The temperature difference reflects the degree of change of thermal stress or thermal expansion intensity between different regions, so that the areas that are deformed or subjected to greater stress under the action of heat and pressure can be identified. According to the comparison rule of the temperature difference, the location and shape of these distortion concentration areas can be accurately and selectively determined by connecting the key trend points (Doit1, Doit2, Doit3, Doit4, Doit5).

[0024] In step S500, marking the position of the three-dimensional shoe model corresponding to the distortion concentration area includes: filling the distortion concentration area with red to obtain a new three-dimensional shoe model.

[0025] Preferably, a new shoe is obtained by adding graphene material to the deformation concentrated area of ​​the shoe corresponding to the three-dimensional shoe model; Graphene is compounded with polymers, rubber or other flexible materials to make composite materials suitable for shoe design; the midsole foam material in the area of ​​concentrated distortion is replaced with graphene composite materials. Graphene composite materials can greatly improve the torsion resistance of shoes, enabling them to effectively absorb impact during exercise and reduce pressure on the feet, especially in areas of high distortion concentration (such as the toe area when running). And because graphene can control and slow down thermal expansion, especially in areas subject to large temperature changes, by applying graphene to these areas, deformation caused by thermal expansion can be effectively reduced, thereby extending the service life of the shoes.

[0026] Preferably, in the design of replacing the midsole material in the distortion concentrated area with a graphene composite material, the distribution of graphene can be further accurately controlled by means of mesh encryption or local reinforcement to ensure that the temperature management and torsional resistance of the area are optimal. Multiple simulations and experiments on the shoe model can be performed to ensure that the addition of graphene does not affect the comfort of the shoe, while improving its thermal management capabilities and torsional resistance.

[0027] The beneficial effects of the present invention are: by accurately locating the concentrated distortion area, temperature difference analysis and using graphene composite materials for local optimization, the comfort, thermal management ability and torsional resistance of the shoes during exercise are improved, and the problem that the sole material is difficult to effectively disperse pressure and temperature at the same time is solved.

[0028] The second aspect of the present invention proposes a shoe, which is produced through the steps of the above-mentioned leisure sports shoe sole torsion-resistant structure design method. It can improve the comfort, thermal management ability and torsion resistance of the shoe during exercise by accurately locating the concentrated deformation area, temperature difference analysis and using graphene composite materials for local optimization, thereby protecting the health of the athlete's feet. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Shown is a flow chart of the torsion-resistant structure design method for leisure sports shoe soles. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] Figure 1 Shown is a flow chart of the torsion-resistant structure design method for leisure sports shoe soles.

[0032] Reference Figure 1 The present invention provides a method for designing a torsion-resistant structure of a leisure sports shoe sole, the method comprising the following steps: S100, obtaining a three-dimensional shoe model; S200, loading the three-dimensional shoe model into finite element analysis software, meshing the three-dimensional shoe model using a meshing algorithm, and obtaining a shoe finite element model; S300, identifying a midsole region of a shoe finite element model and segmenting the shoe finite element model to obtain a midsole region finite element model, and recording a toe portion of the midsole region finite element model as a toe region finite element model; S400, performing a distortion concentration analysis based on the obtained finite element model of the toe region to obtain a distortion concentration region; S500, marking the position of the three-dimensional shoe model corresponding to the distortion concentration area, adding graphene material to the distortion concentration area of ​​the three-dimensional shoe model to obtain a new three-dimensional shoe model, and producing according to the new three-dimensional shoe model.

[0033] According to the design method of the embodiment of the present invention, the comfort, thermal management ability and torsional resistance of the shoe during exercise can be improved by accurately locating the concentrated distortion area, temperature difference analysis and local optimization using graphene composite materials.

[0034] Furthermore, in step S100, the method for acquiring the three-dimensional shoe model includes: using 3D scanning technology (laser scanning or optical scanning) to digitize the shoe to obtain its three-dimensional image data; after acquiring the model, converting it into STL format so as to remove noise, repair cracks and simplify geometry in the analysis software to ensure the quality and accuracy of the model, and defining functional information such as material properties, contact conditions and boundary conditions for the model so as to perform effective simulation in finite element analysis; finally, importing the prepared three-dimensional shoe model into the finite element analysis software to prepare for the next step of meshing and performance analysis.

[0035] In step S200, the three-dimensional shoe model is loaded into the finite element analysis software, and the three-dimensional shoe model is meshed by a meshing algorithm to obtain a tetrahedral mesh in the shoe finite element model.

[0036] The deformation of the sole refers to the uneven deformation or damage of the sole under long-term movement, impact or thermal changes. This will lead to a decrease in the comfort and performance of the shoe, especially in areas that are subject to greater pressure or high temperature (such as the toe part); traditional sole materials often cannot effectively disperse pressure or regulate temperature in these areas, resulting in deformation or damage. In order to solve this problem, the present invention proposes step S300; In step S300, the midsole area of ​​the shoe finite element model is identified and the shoe finite element model is segmented to obtain the midsole area finite element model, and the toe part of the midsole area finite element model is recorded as the toe area finite element model.

[0037] Specifically, the method for obtaining the finite element model of the midsole area is as follows: identifying the finite element model of the midsole area of ​​the sole through geometric analysis and material property analysis, and determining its boundary using an algorithm of interest; segmenting the model and extracting the finite element model of the midsole area.

[0038] Furthermore, the method for obtaining the finite element model of the toe area is to identify the front area that is subjected to impact and pressure, namely the toe area, through finite element stress gradient and pressure distribution analysis, combined with the mechanical behavior of the shoe in static standing and running simulations. Based on these mechanical characteristics, the local mesh encryption and mesh area extraction methods are used to accurately extract the finite element model of the toe area; Furthermore, since sports shoes generate a lot of heat due to impact and friction during use, especially during high-intensity exercise (such as running), the temperature of the sole increases. If the thermal management of the sole is insufficient, the excessive temperature will cause the material to expand, soften or chemically degrade, ultimately affecting the structure and comfort of the shoe. In order to solve the above problem, the present invention proposes step S400; In step S400, a distortion concentration analysis is performed based on the obtained toe area finite element model, and the distortion concentration area is obtained, including: S401, simulating the torsion and bending state of the casual shoe sole during movement by using dynamic simulation software in finite element analysis software; The dynamic simulation software in the finite element analysis software is used to simulate the torsion and bending state of the casual shoe sole in motion, collect data and perform iterative optimization, including determining the sole material properties and geometric parameters, and then perform the sole bending / torsion dynamics simulation to capture the deformation of the sole in different motion states, simulate the heel of the sole being pressed, and apply an oblique upward force to the toe to simulate the bending state in actual motion, and record the relevant deformation parameters, analyze the characteristics of the sole deformation in wave form, and record the stress concentration location to determine the area of ​​the sole that needs to be strengthened. Through this process, the mechanical behavior of the shoe in different situations can be accurately simulated, providing detailed numerical support for subsequent analysis.

[0039] S402, obtaining an unstable pressure range, and obtaining an anti-torsion distortion region through the unstable pressure range; LEss(i) is used to represent the pressure value of the grid in the ith toe area finite element model, where i∈[1,n], and n is the number of grids in the toe area finite element model; the grids in the toe area finite element model are classified to obtain an unstable pressure range and an unstable pressure value range; the pressure LEss(i) of the grid of the toe area finite element model is obtained as a pressure sequence LEK, and the pressure sequence LEK is composed of n pressures, namely {LEss(1), LEss(2), ..., LEss(n)}, LEss(i) is the ith pressure in the pressure sequence LEK, i is a sequence number, and the value range of i is i=1, 2, ..., n, the average value of all pressures in the pressure sequence LEK is obtained, and the standard deviation of the pressures in the pressure sequence LEK is obtained; Furthermore, the pressure sequence is internally classified by the standard deviation of the pressure in the pressure sequence LEK; the pressure greater than the mean plus the standard deviation is classified as an unstable pressure range; The pressure ranges of the unstable pressure sequence range are recorded as [a, b], where a is the minimum value of the unstable pressure range and b is the maximum value of the unstable pressure range.

[0040] Calculate the average value of a and b and record it as v; record [v, b] as the abnormal pressure range.

[0041] The area composed of meshes with pressure in the abnormal pressure range [v, b] in all toe zone finite element models is recorded as the torsional distortion resistance area; Among them, the torsional distortion area refers to the area in the shoe design where the material is deformed (distorted) due to external pressure, impact or friction. In this method, the abnormal pressure range obtained by pressure analysis in the toe area (i.e. the toe part) is determined as the torsional distortion area. The "distortion" here refers to the phenomenon that the material changes in shape due to long-term or short-term excessive pressure, temperature changes and other factors. The torsional distortion area pays special attention to areas with greater impact, such as the position where the foot is subjected to the greatest force when running. These areas need to be specially designed to enhance torsional resistance and shock absorption performance.

[0042] S403, performing temperature analysis on the torsional distortion region to obtain distortion trend lines; wherein the distortion trend lines include a first distortion trend line, a second distortion trend line and a third distortion trend line.

[0043] Specifically, take the center points Doit1 and Doit2 of the two farthest grids in the anti-torsion distortion area, record the line segment between Doit1 and Doit2 as the first distortion trend line L1, and take the midpoint Doit3 of L1; determine the center point of the grid with a pressure value of b in the anti-torsion distortion area; then calculate the distances between the center points of these grids, find the longest distance, and mark the midpoint of this longest distance as Doit4. If only one grid in the anti-torsion distortion area has a pressure value of b, then record the center point of the grid with the pressure value of b as Doit4; determine the center point of the grid with a pressure value of a in the anti-torsion distortion area. Then calculate the distances between the center points of these grids, find the longest distance, and mark the midpoint of this longest distance as Doit5. If only one grid in the anti-torsion distortion area has a pressure value of a, then record the center point of the grid with the pressure value of a as Doit5; record the line segment between Doit3 and Doit4 as the second distortion trend line L2, and the line segment between Doit3 and Doit5 as the third distortion trend line L3.

[0044] Among them, the distortion trend line is a line reflecting the distortion trend drawn by analyzing the thermal stress and pressure distribution in the torsional distortion area. These lines indicate the edges with the most intense stress or heat in the torsional distortion area, and are used to locate the key positions of temperature change and thermal expansion. The distortion trend line can help designers identify which parts of the shoe are prone to excessive stress or thermal expansion during use, and then guide material optimization or local design.

[0045] The beneficial effect of this step is that during the use of sports shoes, the external impact force (such as the pedaling force when running) and friction force on the sole will generate heat, causing the sole temperature to rise. Since the thermal management principle points out that when the sole temperature is too high, the elastic modulus of the material may decrease, resulting in a decrease in the support and torsion resistance of the sole. Therefore, accurately predicting the temperature distribution and thermal expansion trend of the sole is crucial for design optimization. The distortion trend line can help designers identify areas with large temperature changes and areas with strong forces by combining temperature analysis and pressure distribution, so as to effectively manage heat and design materials for these areas, ensuring that the sole maintains sufficient comfort and performance during exercise.

[0046] S404, calculating the average temperature value of each point in the area formed by the first distortion trend line, the second distortion trend line and the third distortion trend line; The heat conduction simulation of the toe area finite element model is performed by finite element analysis software, and the temperature value of the grid in the toe area finite element model is obtained, wherein the temperature value of the grid is the average value of the temperature in the entire grid; The average temperature value of all the grids through which the first distortion trend line passes is Tp1, the average temperature value of all the grids through which the second distortion trend line passes is Tp2, and the average temperature value of all the grids through which the third distortion trend line passes is Tp3; S405, calculating a first distortion trend temperature difference, a second distortion trend temperature difference and a third distortion trend temperature difference by using average temperature values ​​of each point in the region formed by the first distortion trend line, the second distortion trend line and the third distortion trend line; Specifically, the first distortion trend temperature difference (△TEM1) is |Tp1−Tp2−Tp3|; wherein Tp1, Tp2, and Tp3 represent the grid average temperature of the first distortion trend line, the grid average temperature of the second distortion trend line, and the grid average temperature of the third distortion trend line, respectively. The second distortion trend temperature difference (△TEM2) is |Tp2−Tp3−Tp1|; the third distortion trend temperature difference (△TEM3) is |Tp3−Tp2−Tp1|; Among them, the distortion trend temperature difference refers to the temperature difference between different areas within the torsional distortion area; the size of the temperature difference reflects the degree of thermal change of the material at different positions. According to the temperature difference analysis, the areas with the most obvious thermal expansion can be identified. These areas may cause deformation under high temperature or pressure changes. The calculation of the distortion trend temperature difference can help designers understand which areas may be deformed due to excessive thermal stress, so as to optimize the design in a targeted manner.

[0047] S406, analyzing the relative sizes of the first distortion trend temperature difference, the second distortion trend temperature difference, and the third distortion trend temperature difference, and determining the distortion concentration area; Specifically, the method for judging and forming the distortion concentration area includes: when △TEM1≥△TEM2 and △TEM3≥△TEM2, it indicates that the first distortion trend temperature difference is the largest among the three temperature differences, and the second and third distortion trend temperature differences are relatively small; at this time, by connecting points Doit1, Doit2, Doit4, and Doit5, an area composed of points Doit1, Doit2, Doit4, and Doit5 is formed, and the area composed of points Doit1, Doit2, Doit4, and Doit5 is judged as the distortion concentration area; Further, when △TEM1≥△TEM2 and △TEM3<△TEM2, it indicates that the first distortion trend temperature difference is still large, but the third distortion trend temperature difference is smaller than the second distortion trend temperature difference. At this time, by connecting the points Doit1, Doit2, Doit3, and Doit5, an area composed of the points Doit1, Doit2, Doit3, and Doit5 is formed, and the area composed of the points Doit1, Doit2, Doit3, and Doit5 is determined to be a distortion concentration area.

[0048] Furthermore, when △TEM1<△TEM2 and △TEM3≥△TEM2, it indicates that the temperature difference of the second distortion trend is the largest, indicating that the area may be affected by a strong temperature change. By connecting points Doit1, Doit2, Doit3, and Doit4 to form an area composed of points Doit1, Doit2, Doit3, and Doit4, the area composed of points Doit1, Doit2, Doit3, and Doit4 is determined to be a distortion concentration area.

[0049] Furthermore, when △TEM1<△TEM2 and △TEM3<△TEM2: it indicates that the temperature differences of the second and third distortion trends are large. By connecting the points Doit2, Doit3, Doit4, and Doit5, an area composed of the points Doit2, Doit3, Doit4, and Doit5 is formed, and the area composed of the points Doit2, Doit3, Doit4, and Doit5 is determined to be a distortion concentration area.

[0050] Distortion concentration areas refer to areas that are determined by connecting key trend points by comparing different temperature difference values ​​in distortion trend analysis. This area is not only affected by thermal expansion, but also experiences frequent high impact or high pressure during the use of the shoe, causing material deformation or damage. Distortion concentration areas require special design and material treatment, such as stronger torsion-resistant materials or more high-temperature-resistant materials, to avoid product performance degradation due to excessive deformation.

[0051] The beneficial effect of this step is: by analyzing the temperature values ​​of the three distortion trend lines, the temperature difference between each line is calculated. The temperature difference reflects the degree of change of thermal stress or thermal expansion intensity between different regions, so that the areas that are deformed or subjected to greater stress under the action of heat and pressure can be identified. According to the comparison rule of the temperature difference, the location and shape of these distortion concentration areas can be accurately and selectively determined by connecting the key trend points (Doit1, Doit2, Doit3, Doit4, Doit5).

[0052] In step S500, the position of the three-dimensional shoe model corresponding to the distortion concentration area is marked; Preferably, a new shoe is obtained by adding graphene material to the deformation concentrated area of ​​the shoe corresponding to the three-dimensional shoe model; Graphene is compounded with polymers, rubber or other flexible materials to make composite materials suitable for shoe design; the midsole material in the area of ​​concentrated distortion is replaced with graphene composite materials. Graphene composite materials can greatly improve the torsion resistance of shoes, enabling them to effectively absorb impact during exercise and reduce pressure on the feet, especially in areas of high distortion concentration (such as the toe area when running). And because graphene can control and slow down thermal expansion, especially in areas subject to large temperature changes, by applying graphene to these areas, deformation caused by thermal expansion can be effectively reduced, thereby extending the service life of the shoes.

[0053] Preferably, in the design of replacing the midsole material in the distortion concentrated area with a graphene composite material, the distribution of graphene can be further accurately controlled by means of mesh encryption or local reinforcement to ensure that the temperature management and torsional resistance of the area are optimal. Multiple simulations and experiments on the shoe model can be performed to ensure that the addition of graphene does not affect the comfort of the shoe, while improving its thermal management capabilities and torsional resistance.

[0054] The beneficial effects of the present invention are: by accurately locating the concentrated distortion area, temperature difference analysis and using graphene composite materials for local optimization, the comfort, thermal management ability and torsional resistance of the shoes during exercise are improved, and the problem that the sole material is difficult to effectively disperse pressure and temperature at the same time is solved.

[0055] The experimental design is as follows: Experimental subjects: Select the same model of casual sports shoes and conduct comparative experiments on different materials.

[0056] Experimental materials: Control group: shoes with ordinary foam material in the midsole.

[0057] Experimental group: Shoes with graphene composite materials added to the deformation concentrated area on the basis of ordinary foam material in the midsole; The experimental data are as follows: Pressure analysis data: Control group: toe area pressure range: 0.5-4.0Pa; unstable pressure range: [2.5Pa, 4.0Pa]; distortion concentration area: the front toe area, which is subject to higher pressure concentration. Experimental group (graphene composite material): toe area pressure range: 0.8-3.0Pa; unstable pressure range: [1.8Pa, 3.0Pa]; distortion concentration area: the front toe area, after the optimization of graphene material, the pressure distribution is effectively alleviated, and the pressure concentration area is significantly reduced.

[0058] Temperature analysis data: Control group: temperature values ​​of all grids passed by the first distortion trend line: 28°C; temperature values ​​of all grids passed by the second distortion trend line: 30°C; temperature values ​​of all grids passed by the first distortion trend line: 31°C; Experimental group: temperature values ​​of all grids passed by the first distortion trend line: 25°C; temperature values ​​of all grids passed by the second distortion trend line: 27°C; temperature values ​​of all grids passed by the third distortion trend line: 29°C.

[0059] Torsion performance test: Control group: 45-degree bending resistance of the forefoot is 25N, 30-degree bending resistance of the lateral side is 28N, and 30-degree bending resistance of the medial side is 32N. Experimental group: 45-degree bending resistance of the forefoot is 39N, 30-degree bending resistance of the lateral side is 38N, and 30-degree bending resistance of the medial side is 41N.

[0060] Comfort and thermal management tests: Control group: After high-intensity exercise (such as running), the sole temperature rises, the inside of the shoe feels stuffy, and the feet are easily fatigued. After long-term use, the distortion and deformation of the sole lead to reduced comfort.

[0061] Experimental group: The sole temperature remained low during exercise, the feet felt more comfortable, and the heat was effectively dispersed; the graphene composite material provided better comfort, especially in the toe area, with enhanced torsion resistance and reduced fatigue.

[0062] Conclusion: The application of graphene composites in sole design significantly improves the torsional performance of shoes, especially in the toe area, avoiding material deformation caused by excessive pressure and thermal expansion; through thermal difference analysis and pressure distribution, graphene materials effectively solve the problem that ordinary foam sole materials cannot handle pressure and thermal management at the same time, and improve the comfort and durability of sports shoes; the addition of graphene composites makes the performance of the sole more stable during exercise, and enhances the torsional resistance and thermal management capabilities.

[0063] The second aspect of the present invention proposes a shoe, which is produced through the steps of the above-mentioned leisure sports shoe sole torsion-resistant structure design method. It can improve the comfort, thermal management ability and torsion resistance of the shoe during exercise by accurately locating the concentrated deformation area, temperature difference analysis and using graphene composite materials for local optimization, thereby protecting the health of the athlete's feet.

[0064] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for designing a torsion-resistant structure of a leisure sports shoe sole, characterized in that: The method comprises the following steps: S100, obtaining a three-dimensional shoe model; S200, loading the three-dimensional shoe model into finite element analysis software, meshing the three-dimensional shoe model using a meshing algorithm, and obtaining a shoe finite element model; S300, identifying a midsole region of a shoe finite element model and segmenting the shoe finite element model to obtain a midsole region finite element model, and recording a toe portion of the midsole region finite element model as a toe region finite element model; S400, performing a distortion concentration analysis based on the obtained finite element model of the toe region to obtain a distortion concentration region; S500: Mark the position of the three-dimensional shoe model corresponding to the distortion concentration area.

2. The method for designing a torsion-resistant structure of a leisure sports shoe sole according to claim 1, characterized in that: In step S100, the method for acquiring a three-dimensional shoe model includes: using 3D scanning technology to digitize the shoe to obtain its three-dimensional image data; after acquiring the model, converting it into an STL format so that noise can be removed, cracks can be repaired, and geometry can be simplified in the analysis software to ensure the quality and accuracy of the model, and functional information such as material properties, contact conditions, and boundary conditions can be defined for the model so that effective simulation can be performed in finite element analysis; and importing the prepared three-dimensional shoe model into the finite element analysis software.

3. The method for designing a torsion-resistant structure of a leisure sports shoe sole according to claim 1, characterized in that: In step S200, the three-dimensional shoe model is loaded into the finite element analysis software, and the three-dimensional shoe model is meshed by a meshing algorithm to obtain a shoe finite element model, wherein the mesh type of the meshing is a tetrahedral mesh.

4. The method for designing a torsion-resistant structure of a leisure sports shoe sole according to claim 1, characterized in that: In step S300, the method of identifying the midsole area of ​​the shoe finite element model and segmenting the shoe finite element model to obtain the midsole area finite element model, and recording the toe part of the midsole area finite element model as the toe area finite element model includes: The finite element model of the midsole area of ​​the sole is identified through geometric analysis and material property analysis, and its boundary is determined using an algorithm based on curvature or distance field. The model is segmented using a slice segmentation method to extract the finite element model of the midsole area. The front area subjected to impact and pressure is then identified through finite element stress gradient and pressure distribution analysis combined with the mechanical behavior of the shoe in static standing and running simulations. The finite element model of the toe area is extracted using local mesh encryption and mesh area extraction methods.

5. The method for designing a torsion-resistant structure of a leisure sports shoe sole according to claim 1, characterized in that: In step S400, a distortion concentration analysis is performed based on the obtained toe area finite element model, and the distortion concentration area is obtained, including: S401, simulating the torsion and bending state of the casual shoe sole during movement by using dynamic simulation software in finite element analysis software; S402, obtaining an unstable pressure range, and obtaining an anti-torsion distortion region through the unstable pressure range; S403, performing temperature analysis on the torsional distortion region to obtain a distortion trend line; wherein the distortion trend line includes a first distortion trend line, a second distortion trend line and a third distortion trend line; S404, calculating the average temperature value of each point in the area formed by the first distortion trend line, the second distortion trend line and the third distortion trend line; S405, calculating a first distortion trend temperature difference, a second distortion trend temperature difference and a third distortion trend temperature difference by using average temperature values ​​of each point in the region formed by the first distortion trend line, the second distortion trend line and the third distortion trend line; S406, analyzing the relative sizes of the first distortion trend temperature difference, the second distortion trend temperature difference and the third distortion trend temperature difference, and determining the distortion concentration area.

6. A shoe, characterized in that: The shoe is produced by the steps of the method for designing the torsion-resistant structure of the sole of a leisure sports shoe according to any one of claims 1 to 6.

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