Vehicle outer covering part material pre-selecting system and method with multi-index performance requirements and medium

Abstract

The invention relates to the technical field of performance development of vehicle outer covering parts, and discloses a pre-selecting system and method for a vehicle outer covering part material with multi-index performance requirements and a medium. Comprising the steps that an index determination module determines an anti-dent performance index and a flexural rigidity performance index of a vehicle outer covering part material; the standardization module is used for distributing weights to the anti-dent performance index and the flexural rigidity performance index of the vehicle outer covering part material, and carrying out standardization processing on the anti-dent performance index and the flexural rigidity performance index of the vehicle outer covering part material; and the selection module performs weighted summation on the standardized anti-dent performance index and the flexural rigidity performance index by using the distributed weight to obtain a comprehensive score of the vehicle outer covering part material, and selects the vehicle outer covering part material according to the comprehensive score. According to the method, multi-dimensional quantitative evaluation indexes covering economic cost consideration, product comprehensive performance evaluation and the like are designed, and it is ensured that the selected materials can comprehensively meet the diversified requirements of automobile manufacturers.

Description

Technical Field

[0001] This invention relates to the field of automotive exterior panel performance development technology, specifically to a pre-selection system, method, and medium for automotive exterior panel materials with multiple performance requirements. Background Technology

[0002] To meet increasingly stringent environmental protection policies and significantly improve vehicle fuel economy, automakers are actively refining vehicle design, focusing on enhancing aerodynamic efficiency, reducing vehicle dimensions, miniaturizing engines, and accelerating vehicle electrification. Lightweighting and cost control, as crucial development requirements, need to be determined early in the product concept design phase. The core of this strategy lies in finding and applying lightweight materials that can effectively reduce vehicle weight while maintaining cost-effectiveness and functionality.

[0003] Patent application CN104866634A discloses a simulation analysis method for the dent resistance of an outer panel of a vehicle body. It quantifies dent resistance performance through a formulaic method and proposes a method to solve the problem of difficult convergence of contact analysis caused by the complex curvature of the outer panel in existing simulation analysis methods by using a forced displacement loading method. This improves the accuracy of dent resistance performance indicators and simulation efficiency. However, this method can only be used to calculate product performance and make horizontal comparisons after the product designer has completed the structural design, and cannot be implemented in the concept stage of product pre-research.

[0004] Patent application CN117929176A describes a method for evaluating the dent resistance of body panels. This method identifies representative components of the body panels; uses a hardness testing device to measure the hardness of the components on the entire vehicle and obtains the corresponding test dataset; selects a set number of evaluators to evaluate the corresponding components and averages the evaluators' scores to obtain a score for each location; selects a set number of consumers to evaluate the user satisfaction of the corresponding components, groups the evaluation results, and matches the above tests and evaluations for a comprehensive judgment. However, this method relies too heavily on the subjective ratings of evaluators and consumers and can only be implemented after prototype production.

[0005] In summary, the existing solutions are not feasible enough in the development phase, require structural development before evaluation, and involve relatively complex technical parameters and relatively singular evaluation dimensions. Summary of the Invention

[0006] The purpose of this invention is to overcome the aforementioned problems in the prior art and provide a pre-selection system, method, and medium for automotive exterior panel materials with multi-indicator performance requirements. This solution is used for material screening in the early conceptual design stage of vehicles. By designing a quantitative evaluation index that covers multiple dimensions such as economic cost considerations and comprehensive product performance evaluation, it ensures that the selected materials can fully meet the diverse needs of automakers, promoting the development of automobiles towards a greener, more efficient, and safer direction.

[0007] To achieve the above objectives, the present invention provides a pre-selection system for automotive exterior panel materials with multiple performance requirements, comprising: The index determination module determines the dent resistance index of automotive exterior panel materials based on the empirical formula of maximum impact energy absorption, and uses a double-ended simply supported mechanical model to determine the bending stiffness index of automotive exterior panel materials. The standardization module is used to assign weights to the dent resistance performance index and bending stiffness performance index of automotive exterior panel materials using the analytic hierarchy process, and to standardize the dent resistance performance index and bending stiffness performance index of automotive exterior panel materials using the deviation standardization method, so as to obtain standardized dent resistance performance index and bending stiffness performance index. The selection module is used to perform a weighted summation of standardized dent resistance performance indicators and bending stiffness performance indicators using assigned weights to obtain a comprehensive score for automotive exterior panel materials, and select automotive exterior panel materials based on the comprehensive score.

[0008] The beneficial effects of the technical solution of this invention are as follows: This invention can effectively guide product design engineers in the initial material selection process for automotive exterior body panels. By quantifying and calculating relevant indicators based on the parameter information of candidate materials provided by suppliers, suitable materials can be quickly selected, reducing the number of rounds of trial and error or simulation analysis. This can shorten the development cycle, reduce development costs, and create a first-mover advantage in the development of automotive exterior body panels. Attached Figure Description

[0009] Figure 1 This is a structural diagram of the automotive exterior panel material pre-selection system based on the multi-indicator performance requirements of this invention; Figure 2 This is a simplified double-end simply supported beam model of automotive exterior body panel material under concentrated load; Figure 3 This is a flowchart of the method for pre-selecting automotive exterior body panel materials based on multiple performance requirements according to the present invention. Detailed Implementation

[0010] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0011] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0012] Furthermore, the technical solutions provided in the various embodiments of the present invention can be combined with each other, but only if they are feasible to those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0013] Example 1 like Figure 1 The multi-indicator performance requirement pre-selection system for automotive exterior panel materials, as shown, includes: The index determination module determines the dent resistance index of automotive exterior panel materials based on the empirical formula of maximum impact energy absorption, and uses a double-ended simply supported mechanical model to determine the bending stiffness index of automotive exterior panel materials. The standardization module is used to assign weights to the dent resistance performance index and bending stiffness performance index of automotive exterior panel materials using the analytic hierarchy process, and to standardize the dent resistance performance index and bending stiffness performance index of automotive exterior panel materials using the deviation standardization method, so as to obtain standardized dent resistance performance index and bending stiffness performance index. The selection module is used to perform a weighted summation of standardized dent resistance performance indicators and bending stiffness performance indicators using assigned weights to obtain a comprehensive score for automotive exterior panel materials, and select automotive exterior panel materials based on the comprehensive score.

[0014] The main properties of automotive exterior body panel materials include two aspects: dent resistance and bending stiffness.

[0015] Among them, the dent resistance performance of automotive exterior panel materials refers to the ability of automotive exterior panel materials to absorb energy and resist the formation of dents when subjected to low-energy impacts, such as when a stone is thrown at the door while driving.

[0016] This invention establishes a comprehensive material selection system that takes into account cost, performance, and the environmental impact of materials throughout their entire life cycle, ensuring the scientific and sustainable nature of decision-making.

[0017] Furthermore, the dent resistance performance indicators of the automotive exterior panel material of the present invention include dent resistance performance indicators based on lightweighting and dent resistance performance indicators based on cost control.

[0018] Furthermore, the dent resistance performance index of the lightweight material is as follows: ; in, It refers to the yield strength of automotive exterior panel materials; ρ is the density of the automotive exterior panel material; E is the Young's modulus of elasticity of the automotive exterior panel material; It is a power-law exponent of the thickness of automotive exterior panel materials, and its value is related to the shape of the automotive exterior panel materials.

[0019] The dent resistance performance index of the material based on cost control is: ; Where u represents the unit price of automotive exterior body panel materials.

[0020] In this invention, the method for determining the dent resistance performance index of automotive exterior panel materials includes: The energy method is used to evaluate the dent resistance of automotive exterior panel materials. The formula is as follows (this formula also provides a quantitative description of the dent resistance of automotive exterior panel materials): Where Q is the dent energy of the automotive exterior panel material, which characterizes the amount of external impact energy absorbed by the material. When the Q value exceeds a certain threshold, the material is considered to have a noticeable dent. k is a constant, a correction coefficient, and its specific value needs to be determined based on experimental calibration. t is the thickness of the automotive exterior panel. S is the plate stiffness of the automotive exterior panel. F is the external load at the loading point of the automotive exterior panel. H is the deformation of the automotive exterior panel at the loading point caused by external load; H is the shape factor related to the Gaussian curvature at the loading point of the automotive exterior panel.

[0021] Equation (1) illustrates the relationship between the material parameters of automotive exterior panels and the maximum impact energy that can be absorbed without perceptible deformation. Some parameters in this formula can only be determined after the 3D data is mature and cannot be known at the product concept stage. In order to facilitate the initial comparison and screening of multiple automotive exterior panel materials, it is necessary to further calculate key indicators that do not involve specific geometric parameters, which are the performance indicators mentioned later.

[0022] To facilitate the measurement of dent resistance of different materials and eliminate the influence of product geometry information in the concept stage on the comparison of material performance, this invention proposes a method for calculating material performance comparison indicators.

[0023] In the design process of automotive exterior body panels, the thickness of the automotive exterior body panel material can be determined according to the dent resistance performance requirements of the automotive exterior body panel material, and the value can be derived from formula (1): To facilitate comparison of the properties of different materials, a rectangular automotive exterior panel with length v and width w is taken. Based on equation (2), the mass m of the material of this rectangular automotive exterior panel is calculated as follows: Typically, for rectangular thin-walled coverings, α can be approximated as 2 based on experience. Therefore, in this embodiment, the above formula can also be: For different automotive exterior panel materials under the same working conditions, their shapes are all the same, therefore Right now It can be regarded as a constant ( The relevant parameters are related to the shape of the vehicle's outer body panel. Under the same impact energy absorption, these parameters are the same for different materials of the vehicle's outer body panel.

[0024] When determining the dent resistance performance index of lightweight materials (with lightweight automotive exterior panel materials as the design goal), minimizing m is the objective. Right now Defined as a dent resistance index based on lightweight materials, because The larger the value, the lighter the material of the vehicle body panel that meets the dent resistance requirements. To facilitate the lateral comparison of multiple materials, this index removes the influence of geometric parameters, introduces a lightweight (mass) parameter, and retains the material property parameters.

[0025] When determining the dent resistance performance index of materials based on cost control (with cost control of automotive exterior panel materials as the design objective), let the cost of automotive exterior panel materials be denoted as z, and the unit price of automotive exterior panel materials be denoted as u. Then, the total mass of automotive exterior panel materials purchased at this time is: Substituting into equation (3), we get: In this embodiment, the above formula can also be written as: Now, with minimizing z as the objective, Right now Defined as a material dent resistance index based on cost control, similarly, according to equation (4), z is then related to... A negative correlation; the larger the value, the lower the cost of the automotive body panel material while still meeting the dent resistance requirements.

[0026] In this invention, the bending stiffness performance of automotive exterior panel materials refers to the ability of automotive exterior panel materials to resist deformation and return to their initial state when subjected to static loads, such as when a person presses on the engine hood.

[0027] Furthermore, the bending stiffness performance indicators of automotive exterior panel materials include bending stiffness performance indicators based on lightweighting and bending stiffness performance indicators based on cost control.

[0028] Preferably, the bending stiffness performance index of the lightweight material is as follows: ; The material's bending stiffness performance index based on cost control is: .

[0029] To facilitate the measurement of the bending stiffness performance of different materials and eliminate the influence of product geometry information in the conceptual stage on the comparison of material performance, this invention proposes a method for calculating the performance comparison index of materials.

[0030] This invention simplifies the problem of load-bearing on automotive exterior panel materials, simplifying the automotive exterior panel as a double-ended simply supported beam. A schematic diagram of the simplified double-ended simply supported beam model of the automotive exterior panel material under concentrated loads is shown below. Figure 2 As shown, and considering the worst-case scenario: applying force at the weakest midpoint, methods for determining the bending stiffness performance indicators of automotive exterior panel materials include: For automotive exterior panel materials to prevent plastic strain under load, the maximum stress must not exceed the yield strength stress, i.e.: The moment of inertia of the cross-section of automotive exterior panel materials ; This represents the maximum bending moment at the cross section of a simply supported beam model under concentrated load on an automotive exterior body panel material. L This indicates the span of the support point of the cover (the value of L can be regarded as equal to the value of the long side v of the rectangular automotive exterior cover).

[0031] Assuming the shape of the vehicle's exterior body panels is fixed by the stylist and cannot be changed, while the thickness of the exterior body panel material can be varied according to performance requirements, the thickness of the exterior body panel material can be derived from equation (5): At this point, taking the critical value (minimum value) of t in equation (6), the mass m of the rectangular vehicle outer covering material is calculated as follows: For different automotive exterior panel materials under the same working conditions Considered a constant (similarly, for the same operating condition, for different automotive exterior panel materials, The relevant parameters are all the same.

[0032] When determining the bending stiffness performance index of lightweight materials (with the design goal of lightweight automotive exterior panel materials), the objective is to minimize m. Defined as a dent resistance index for lightweight materials, the larger the value, the lighter the material is while still meeting the bending stiffness requirements.

[0033] When determining the flexural stiffness performance index of materials based on cost control (when the design goal is to control the cost of automotive exterior body panel materials), Substituting into equation (7), we get: Now, with minimizing z as the objective, Defined as a material's dent resistance performance index based on cost control, the larger the value, the lower the cost of the material while meeting the bending stiffness requirements.

[0034] Because different automotive exterior body panels have different performance requirements—for example, front bumper skin panels require higher dent resistance to withstand occasional impacts from stones or road obstacles during daily use, while engine compartment panels require higher bending stiffness to address subjective perceptions such as passenger pressure resistance—different weights can be assigned to dent resistance and bending stiffness performance indicators based on the performance metrics of different components. The overall evaluation index can then be calculated. Weight allocation can utilize the Analytic Hierarchy Process (AHP), which combines subjective and objective weighting. AHP first requires defining the hierarchy of objectives and criteria. Then, expert opinions (which can be manually assessed based on the product concept stage and the designer's performance dimension positioning requirements for different automotive exterior body panels; a simple example is the front bumper and engine compartment performance positioning mentioned above) are collected to evaluate the relative importance of each evaluation indicator as a scale value. This constructs a hierarchical information judgment matrix, and finally, the weight values ​​of each indicator are calculated.

[0035] The target layer of this invention is a comprehensive evaluation of specific automotive exterior panel materials, and the criterion layer consists of four indicators. Furthermore, this invention employs an analytic hierarchy process (AHP) to assign weights to the dent resistance and bending stiffness performance indicators of automotive exterior panel materials, including: The dent resistance performance of lightweight materials, the dent resistance performance of cost-controlled materials, the flexural stiffness performance of lightweight materials, and the flexural stiffness performance of cost-controlled materials are compared pairwise and ranked according to their importance, such that A≥B≥C≥D, where A is the most important indicator, B is the second most important indicator, C is the third most important indicator, and D is the fourth most important indicator. A judgment matrix is ​​defined using the scaling method. In this embodiment, the judgment matrix is ​​as follows (the form of the judgment matrix is ​​generally predetermined and can be calculated according to the given matrix format): The terms "first most important," "second most important," "third most important," and "fourth most important" refer to the degree of importance of the indicators. A is the most important indicator among the four, B is the second most important indicator, and D is the least important indicator. The ranking of importance among the four indicators is not fixed but is evaluated based on specific usage conditions. For example, in some cases, the dent resistance performance of lightweight materials may be the most important indicator (A), while in other cases, it may be the least important indicator (D).

[0036] In the judgment matrix, 1 indicates that the two indicators are equally important; This indicates the relative importance of A to B. ; This indicates the relative importance of B compared to C. ; This indicates the relative importance of C compared to D. ; , as well as These are all scale values ​​between adjacent indicators, with specific values ​​determined by expert opinions. The larger the value, the higher the importance. For example, a gradient of 0.2 can be used to set 6 relative importance measurement standards: [1.0, 1.2, 1.4, 1.6, 1.8, 2.0].

[0037] The weighting values ​​for each of the above four indicators are calculated using the following formula: In the formula This represents the weight assigned to the i-th most important indicator among the four indicators mentioned above. Represents the first in the judgment matrix i Line number j The weight value of the column (i.e., the weight value of the column in the judgment matrix above) i Line number j(elements of the column), for example yes , yes , yes .

[0038] Since the meanings and dimensions of the various indicators are different before weighted summation, it is necessary to convert all indicators to the same standard. Therefore, the deviation standardization method is used to standardize the dent resistance performance and bending stiffness performance indicators of automotive exterior panel materials, respectively. The methods for obtaining standardized dent resistance performance and bending stiffness performance indicators include: In the formula, The i-th most important indicator after standardization; This represents the i-th most important indicator before standardization. This represents the smallest of the four indicators (i.e., the indicator with the smallest value among the four indicators). This indicates the largest indicator among the four indicators mentioned above (the indicator with the largest value among the four indicators mentioned above).

[0039] Furthermore, the method in this invention for obtaining a comprehensive score for automotive exterior panel materials by linearly weighting and summing standardized dent resistance and bending stiffness performance indicators using assigned weights includes: In the formula, P This indicates the overall score of automotive exterior panel materials. A higher P-value means that the material has a higher priority under the four performance indicators of the corresponding assembly (an automotive component that is assembled from several parts, components, assemblies, or accessories and has an independent function, such as the hood assembly or the front bumper assembly). In this case, the material is preferred.

[0040] In the early stages of product pre-research, when the shape and dimensions are not yet fully defined, this invention allows for the screening of multiple material libraries based on requirements such as lightweighting or cost control. This facilitates rapid supplier selection, product performance positioning, and development cost estimation. The solution of this invention involves calculating a comprehensive material score for each outer covering component by using custom performance indicators and weighting expert opinions. This provides a direct and multi-dimensional evaluation and analysis of multiple materials.

[0041] This invention aims at lightweighting and cost control in automobiles. It designs performance indicators for automotive body panels based on dent resistance and bending stiffness, defines and calculates these indicators, and provides a method for pre-screening automotive materials using these indicators. By standardizing indicators of different dimensions and combining them with the analytic hierarchy process (AHP) to calculate the comprehensive scores of different materials under the performance requirements of different components, engineers can easily select all suitable materials, choose suppliers, define product performance, and estimate development costs. This allows for early planning during the product concept design phase, enabling horizontal comparison of material performance. The implementation phase is integrated into the product production cycle. Theoretical modeling and multi-dimensional quantitative indicators achieve objective definitions of material performance, while expert opinions provide subjective ratings for each performance indicator, ensuring consistency and authority in the evaluation. This effectively guides product design engineers in the initial material selection process for body-in-white body panel design. By quantifying relevant indicators based on the parameters of candidate materials provided by suppliers, suitable materials can be quickly selected, reducing rounds of trial and error or simulation analysis. This shortens the development cycle, reduces development costs, and creates a first-mover advantage in the development of automotive exterior body panels.

[0042] Example 2 like Figure 3 The method for pre-selecting automotive exterior panel materials based on multi-indicator performance requirements, as shown, includes: The dent resistance performance index of automotive exterior panel materials is determined based on the empirical formula for maximum impact energy absorption, and the bending stiffness performance index of automotive exterior panel materials is determined using a double-ended simply supported mechanical model. The Analytic Hierarchy Process (AHP) was used to assign weights to the dent resistance and bending stiffness performance indices of automotive exterior panel materials. The deviation standardization method was then used to standardize the dent resistance and bending stiffness performance indices of automotive exterior panel materials, resulting in standardized dent resistance and bending stiffness performance indices. The standardized dent resistance performance index and bending stiffness performance index are weighted and summed using the assigned weights to obtain a comprehensive score for automotive exterior panel materials. Automotive exterior panel materials are selected based on the comprehensive score.

[0043] Example 3 A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method as described in Embodiment 2.

[0044] It should be understood that any parts not described in detail in this specification belong to the prior art.

[0045] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A pre-selection system for automotive exterior body panel materials based on multiple performance requirements, characterized in that, include: The index determination module determines the dent resistance index of automotive exterior panel materials based on the empirical formula of maximum impact energy absorption, and uses a double-ended simply supported mechanical model to determine the bending stiffness index of automotive exterior panel materials. The standardization module is used to assign weights to the dent resistance performance index and bending stiffness performance index of automotive exterior panel materials using the analytic hierarchy process, and to standardize the dent resistance performance index and bending stiffness performance index of automotive exterior panel materials using the deviation standardization method, so as to obtain standardized dent resistance performance index and bending stiffness performance index. The selection module is used to perform a weighted summation of standardized dent resistance performance indicators and bending stiffness performance indicators using assigned weights to obtain a comprehensive score for automotive exterior panel materials, and select automotive exterior panel materials based on the comprehensive score.

2. The pre-selection system for automotive exterior body panel materials with multiple performance requirements according to claim 1, characterized in that, The dent resistance performance indicators of automotive exterior panel materials include dent resistance performance indicators based on lightweight materials and dent resistance performance indicators based on cost control materials.

3. The pre-selection system for automotive exterior body panel materials with multiple performance requirements according to claim 2, characterized in that, The dent resistance index of lightweight materials is ; in, It refers to the yield strength of automotive exterior panel materials; ρ is the density of the automotive exterior panel material; E is the Young's modulus of elasticity of the automotive exterior panel material; It is the power exponent of the thickness of automotive exterior body panel materials; The dent resistance performance index of the material based on cost control is: ; Where u represents the unit price of automotive exterior body panel materials.

4. The pre-selection system for automotive exterior body panel materials with multiple performance requirements according to claim 3, characterized in that, The bending stiffness performance indicators of automotive exterior body panel materials include those based on lightweight materials and those based on cost control.

5. The pre-selection system for automotive exterior body panel materials with multiple performance requirements according to claim 4, characterized in that, The bending stiffness performance index of lightweight materials is as follows: ; The material's bending stiffness performance index based on cost control is: .

6. The pre-selection system for automotive exterior body panel materials with multiple performance requirements according to claim 5, characterized in that, The methods for assigning weights to the dent resistance and bending stiffness performance indicators of automotive exterior panel materials using the analytic hierarchy process (AHP) include: The dent resistance performance of lightweight materials, the dent resistance performance of cost-controlled materials, the bending stiffness performance of lightweight materials, and the bending stiffness performance of cost-controlled materials are compared pairwise and ranked according to their importance, so that the result is A≥B≥C≥D, where A is the most important of the four indicators, B is the second most important, C is the third most important, and D is the fourth most important. The judgment matrix is ​​obtained by scaling method. The weighting values ​​for each of the above four indicators are calculated using the following formula: In the formula This represents the weight assigned to the i-th most important indicator among the four indicators mentioned above. Represents the first in the judgment matrix i Line number j The weight value of the column.

7. The pre-selection system for automotive exterior body panel materials with multiple performance requirements according to claim 6, characterized in that, The deviation standardization method is used to standardize the dent resistance and bending stiffness performance indicators of automotive exterior panel materials. The methods for obtaining standardized dent resistance and bending stiffness performance indicators include: In the formula, The i-th most important indicator after standardization; This represents the i-th most important indicator before standardization. This represents the smallest of the four indicators mentioned above; This indicates the highest value among the four indicators mentioned above.

8. The pre-selection system for automotive exterior body panel materials with multiple performance requirements according to claim 7, characterized in that, Methods for obtaining a comprehensive score for automotive exterior panel materials by weighted summation of standardized dent resistance and bending stiffness performance indicators using assigned weights include: In the formula, P This indicates the overall score of automotive exterior panel materials.

9. A method for pre-selecting automotive exterior body panel materials based on multiple performance requirements, characterized in that, include: The dent resistance performance index of automotive exterior panel materials is determined based on the empirical formula for maximum impact energy absorption, and the bending stiffness performance index of automotive exterior panel materials is determined using a double-ended simply supported mechanical model. The Analytic Hierarchy Process (AHP) was used to assign weights to the dent resistance performance index and bending stiffness performance index of automotive exterior panel materials. The deviation standardization method was used to standardize the dent resistance performance index and bending stiffness performance index of automotive exterior panel materials, resulting in standardized dent resistance performance index and bending stiffness performance index. The standardized dent resistance performance index and bending stiffness performance index are weighted and summed using the assigned weights to obtain a comprehensive score for automotive exterior panel materials. Automotive exterior panel materials are selected based on the comprehensive score.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in claim 9.

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