Curvature rod piece structure design method and system and rod piece structure application

Abstract

The invention provides a curvature rod piece structure design method and system and rod piece structure application, and the method comprises the steps: designing a preliminary curvature rod piece model through employing a simulation technology based on a constructed rod piece bending equation; according to curvature factors in the rod piece bending equation, supporting points are arranged in the preliminary curvature rod piece model; determining an included angle of the rod piece by adopting a pre-constructed included angle formula; and based on the supporting point, the rod piece included angle and a preset target curvature factor, a simulation technology is utilized to generate a final curvature rod piece model. By introducing the curvature control factor A, constructing the controllable curvature rod piece system and adjusting the mechanical response of the rod piece, the chiral metamaterial structure design with constant deformation and minimum stress is achieved, the limitation of traditional metamaterial design is broken through, and the requirements of multiple fields for high-performance materials are met.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of buffer structure, and particularly relates to a curvature rod structure design method and system and a rod structure application. BACKGROUND

[0002] Traditional metamaterials mainly depend on uniform rod array structures, such as common hexagonal honeycomb structures. Such structures achieve the negative Poisson's ratio effect through fixed topological configurations, and have certain limitations in material performance regulation, and are difficult to meet the diversified and dynamic demand for material performance under complex working conditions. Existing active regulation methods mainly include stimulus-responsive deformation materials manufactured by 4D printing technology, such as heat-sensitive polymers, which can realize material deformation according to environmental temperature changes; and piezoelectric materials, which realize dynamic stiffness regulation of materials by applying an electric field.

[0003] In existing metamaterial structures, the curvature of the rod is difficult to control accurately, so that the material cannot effectively disperse stress when stressed, and the energy absorption efficiency is generally low, usually less than 60%. Due to the limitations of structure design and rod characteristics, the equivalent stress concentration phenomenon is easy to occur in the metamaterial during cyclic loading, so that the material cycle life is short, usually less than 10 4 times. Some advanced metamaterial manufacturing technologies, such as 4D printing, have complex processes and high requirements for equipment and materials, resulting in a substantial increase in manufacturing costs, which can increase by up to 300% compared with traditional manufacturing processes. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the application provides a curvature rod structure design method, which comprises the following steps:

[0005] Based on the constructed rod bending equation, a preliminary curvature rod model is designed by using simulation technology;

[0006] According to the curvature factor in the rod bending equation, a support point is set in the preliminary curvature rod model; and a rod angle is determined by using a pre-constructed angle formula;

[0007] Based on the support point, the rod angle and a preset target curvature factor, a final curvature rod model is generated by using simulation technology.

[0008] Preferably, the rod bending equation satisfies the following formula:

[0009] y=A·sin(0.1x)

[0010] In the above formula, y is A, A is a curvature factor, x∈[0,20π], and π is a circular constant.

[0011] Preferably, the rod angle satisfies the following formula:

[0012] θ = 15° · (8 - A)

[0013] In the above formula, θ is the angle between the bars, and A is the curvature factor.

[0014] Preferably, the preliminary curvature bar model is a structure in which multiple bars are arranged in a uniform array around the periphery of a circular ring.

[0015] Preferably, the material of the circular ring is structural steel, and the material of the bars is structural steel.

[0016] Preferably, the bars are cylindrical.

[0017] Preferably, after generating the final curvature bar model using simulation technology based on the support points, the angle between the bars, and a preset target curvature factor, the method comprises:

[0018] Based on the curvature bar model, printing the curvature bar model to obtain a curvature bar structure drawing;

[0019] Based on the curvature bar structure drawing, manufacturing using laser melting technology to obtain a curvature bar structure.

[0020] Preferably, after manufacturing the curvature bar structure using laser melting technology based on the curvature bar structure drawing, the method comprises:

[0021] Adding a preset displacement threshold to the curvature bar structure to obtain a constrained curvature bar structure;

[0022] Based on the constrained curvature bar structure, performing a mechanical performance test to verify whether the curvature bar structure is qualified.

[0023] In a second aspect, the present application also proposes a curvature bar structure design system, comprising:

[0024] A preliminary simulation module for designing a preliminary curvature bar model using simulation technology based on a constructed bar bending equation;

[0025] A setting module for setting support points in the preliminary curvature bar model according to the curvature factor in the bar bending equation, and determining the angle between the bars using a pre-constructed angle formula;

[0026] A curvature bar model design module for generating a final curvature bar model using simulation technology based on the support points, the angle between the bars, and a preset target curvature factor.

[0027] In a third aspect, the present application also proposes an application of a curvature bar structure, wherein the curvature bar structure obtained by the curvature bar structure design method is used at least in a cushioning structure in the fields of automobiles or aerospace.

[0028] In a fourth aspect, the present application also provides an electronic device, comprising: at least one processor and a memory; the memory and the processor are connected through a bus;

[0029] The memory is used for storing one or more programs.

[0030] When the one or more programs are executed by the at least one processor, the curvature rod structure design method is realized.

[0031] In a fifth aspect, the present application also provides a readable storage medium, which has an execution program stored thereon, and the execution program is executed to realize the curvature rod structure design method.

[0032] Compared with the closest prior art, the present application has the following beneficial effects:

[0033] The curvature rod structure design method, system and rod structure application of the present application comprise: based on the constructed rod bending equation, a preliminary curvature rod model is designed by using simulation technology; a support point is set in the preliminary curvature rod model according to the curvature factor in the rod bending equation; a rod angle is determined by using a pre-constructed angle formula; and a final curvature rod model is generated by using simulation technology based on the support point, the rod angle and a preset target curvature factor. By introducing the curvature control factor A, the present application constructs a controllable curvature rod system, adjusts the mechanical response of the rod, realizes the chiral metamaterial structure design of "constant deformation and minimum stress", breaks through the limitation of traditional metamaterial design, and meets the demand for high-performance materials in multiple fields. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 The axis graph in the curvature rod structure design method provided by the present application;

[0035] Figure 2 The single rod model provided by the present application when A is 0, 2 and 8;

[0036] Figure 3 The single rod finite element analysis process graph provided by the present application when the A value is 4;

[0037] Figure 4 The support reaction force and equivalent stress change law of different single rod models provided by the present application when the A value is 0-8;

[0038] Figure 5 The structure body model provided by the present application when the A value is different and the support number is 3-8;

[0039] Figure 6The finite element analysis process chart of the structure provided by the application is provided with an A value of 8 and a support of 6;

[0040] Figure 7 The finite element analysis of the structure with different A values and different support numbers provided by the application provides a change rule of the reaction force. DETAILED DESCRIPTION

[0041] The specific embodiments of the application will be further described in detail below with reference to the accompanying drawings.

[0042] Example 1:

[0043] The application provides a curvature rod structure design method, which can include the following steps:

[0044] Step 1: based on the constructed rod bending equation, a preliminary curvature rod model is designed by using simulation technology;

[0045] Step 2: according to the curvature factor in the rod bending equation, a support point is set in the preliminary curvature rod model; a rod angle is determined by using a pre-constructed angle formula;

[0046] Step 3: based on the support point, the rod angle and the preset target curvature factor, a final curvature rod model is generated by using simulation technology.

[0047] Further, in step 1, the rod bending equation satisfies the following formula:

[0048] y=A·sin(0.1x)

[0049] In the above formula, y is A, A is the curvature factor, x∈[0,20π], and π is the circular constant.

[0050] As described above, y=A·sin(0.1x) is used as the rod bending equation (where x∈[0,20π]), as Figure 1 A value of the curve set is different, and the curvature of the rod is accurately controlled by adjusting the curvature factor A (the value range is 0-8). A large amount of simulation and experimental verification shows that Figure 4 When A is 0-8, the change rule of the reaction force and the equivalent stress of the different single rod models is analyzed, and when A=8, the mechanical properties of the rod reach the optimum. For example: the rod specification is set to 6mm in diameter and 62.8mm in length, and structural steel is selected to ensure that the rod has good strength and toughness.

[0051] Further, in step 2, the rod angle satisfies the following formula:

[0052] θ=15°·(8-A)

[0053] In the formula, θ is the angle between the rods, and A is the curvature factor.

[0054] The above-described rod angle optimization: the rod angle is optimized by the formula θ=15°·(8-A), to avoid stress interference between the rods and further enhance the structural mechanical properties.

[0055] Further, the preliminary curvature rod model is a structure in which a plurality of rods are arranged in a uniform array around the periphery of the two rings.

[0056] The above-described support point layout can be optimized according to the numerical difference of the curvature factor A. When A≤4, a 4-support point array is used to ensure structural stability; when A>4, a 6-support point spiral array is used to effectively disperse stress and improve the overall performance of the structure.

[0057]

[0058] Further, the material of the ring is structural steel, and the material of the rod is structural steel.

[0059] Further, the rod is cylindrical. For example, Figure 5 The support number is 3-8.

[0060] In step 3, during simulation, the target curvature factor A can be input according to the actual application requirements, and a rod CAD model conforming to the sin curve is generated based on the input A value using professional design software. For example, Figure 6 When the A value is 8 and the support is 6, the finite element analysis process diagram of the structure is as follows.

[0061] Further, after generating the final curvature rod model based on the support points, the rod angle, and the preset target curvature factor using simulation technology, the method further includes:

[0062] Based on the curvature rod model, the curvature rod model is printed to obtain a curvature rod structure drawing;

[0063] Based on the curvature rod structure drawing, a curvature rod structure is manufactured using laser melting technology.

[0064] The above-described laser melting technology can accurately form complex structures and ensure the manufacturing accuracy of the rods.

[0065] Further, after manufacturing the curvature rod structure based on the curvature rod structure drawing using laser melting technology, the method further includes:

[0066] A predetermined displacement threshold is added to the curvature rod structure to obtain a constrained curvature rod structure.

[0067] Based on the constrained curvature rod structure, a mechanical property test is carried out to verify whether the curvature rod structure is qualified. Figure 3 For a single rod with A value of 4, a 0.1mm displacement constraint is applied to the rod, and the finite element analysis process diagram is shown.

[0068] During testing, a 0.1mm displacement constraint can be applied to the completed rod to verify the mechanical properties and ensure that the product meets the design requirements. The specific test results are as follows:

[0069] Indicator Conventional scheme The present invention (A=8) Lifting range Energy absorption efficiency 45% 82% 82.2% Equivalent stress peak 350 MPa 198 MPa 43.4% Fatigue life 10 4 secondary 10 6 secondary 100 times

[0070] Note: Energy absorption efficiency η = ∫σdε / (σ_max·ε_max), which reflects the proportion of elastic deformation

[0071] It can be seen that the mechanical performance customization of the present application is as follows: Figure 2 For single rod models with A values of 0, 2, and 8, the support reaction force of the metamaterial structure can be precisely controlled by adjusting the curvature factor A value. When A = 8, the support reaction force is reduced by 66%, achieving flexible customization of material mechanical properties. Moreover, the manufacturing simplicity is: using laser melting manufacturing process, the yield rate is as high as 95% or more, which is significantly better than the 70% yield rate of 4D printing, reducing manufacturing cost and production cycle.

[0072] As shown in the following table: Figure 7 The variation of support reaction force of finite element analysis structure with different A values and different support numbers is shown in the following table: when the deformation is consistent, the smaller the support reaction force and the smaller the equivalent stress, the softer the rod material, and the core advantage is: under the condition of limited deformation, the material stress and external load are reduced, the energy absorption capacity, safety and comfort are improved, and the cost is optimized.

[0073] As a person skilled in the art should know: in the application of automobile B column filling structure, the impact absorption efficiency of traditional scheme is only 45%, which is difficult to fully guarantee the safety performance of the passenger compartment of the vehicle during collision. For aerospace buffer pieces, the stress borne by traditional metamaterial rods during use is often greater than 350MPa, which easily causes fatigue fracture, seriously affecting the safety and reliability of aerospace equipment. The present application introduces a curvature control factor A to construct a controllable curvature rod system, adjusts the mechanical response of the rod, realizes the design of a chiral metamaterial structure with "constant deformation and minimum stress", breaks through the limitations of traditional metamaterial design, and meets the demand for high-performance materials in multiple fields.

[0074] Based on the above method, a specific automobile B column filling structure is provided, for example:

[0075] Parameter setting: according to the automobile safety standards and actual working condition requirements, the target deformation is determined to be 0.1mm; considering the strength and lightweight requirements, the curvature factor A is selected to be 6; a 6-support point spiral structure is used as the array layout.

[0076] Manufacturing detection: titanium alloy is selected as the rod material, the yield strength is greater than or equal to 800 MPa, the rod is manufactured by SLM printing technology; the rod is detected by 3D scanning technology, and the curvature error is less than 0.05 mm.

[0077] The actual measurement effect of the automobile B column filling structure is as follows:

[0078] Collision test: in the 40km / h side collision test, the passenger compartment intrusion amount is reduced by 38%, effectively ensuring the passenger safety space.

[0079] Energy absorption: the energy absorption value is increased from 82kJ to 148kJ, and the vehicle collision energy absorption capacity is significantly enhanced.

[0080] Cost control: the single-piece cost is reduced from ￥320 to ￥210, realizing the dual goals of performance improvement and cost optimization.

[0081] In addition, a specific use such as a space cargo compartment buffer bottom plate is provided.

[0082] Curvature gradient design: according to the stress characteristics of different regions of the space cargo compartment buffer bottom plate, the curvature gradient is designed. The center area adopts A=8 to realize high energy absorption effect; the edge area adopts A=4 to ensure high rigidity of the structure.

[0083] Dynamic response verification: under the condition of 10g impact load test, the stress peak value is less than 200MPa; the vibration transmission rate is reduced by 55% compared with the aluminum alloy substrate, effectively improving the buffering and damping performance of the space cargo compartment.

[0084] Example 2:

[0085] The present application also provides a curvature rod structure design system, comprising:

[0086] A preliminary simulation module is used to design a preliminary curvature rod model based on the constructed rod bending equation and simulation technology;

[0087] A setting module is used to set a support point in the preliminary curvature rod model according to the curvature factor in the rod bending equation; and a pre-constructed angle formula is used to determine the rod angle.

[0088] A curvature rod model design module is used to generate a final curvature rod model based on the support point, the rod angle and a preset target curvature factor by using simulation technology.

[0089] The above-mentioned rod bending equation satisfies the following formula:

[0090] y=A·sin(0.1x)

[0091] In the formula, y is, A is a curvature factor, x is in [0, 20pi], and pi is a circular constant.

[0092] The rod angle satisfies the following formula:

[0093] Theta=15* (8-A)

[0094] In the formula, theta is the rod angle, and A is the curvature factor.

[0095] The preliminary curvature rod model is a structure in which a plurality of rods are arranged in a uniform array around the periphery of two rings.

[0096] The material of the ring is structural steel, and the material of the rod is structural steel.

[0097] The rod is cylindrical.

[0098] After the final curvature rod model is generated based on the support point, the rod angle, and the predetermined target curvature factor using simulation technology, the method further includes:

[0099] Based on the curvature rod model, the curvature rod model is printed to obtain a curvature rod structure drawing;

[0100] Based on the curvature rod structure drawing, a curvature rod structure is manufactured using laser melting technology.

[0101] After the curvature rod structure is manufactured based on the curvature rod structure drawing using laser melting technology, the method further includes:

[0102] A predetermined displacement threshold is added to the curvature rod structure to obtain a constrained curvature rod structure.

[0103] Based on the constrained curvature rod structure, a mechanical property test is performed to verify whether the curvature rod structure is qualified.

[0104] Embodiment 3:

[0105] The application also provides an application of the curvature rod structure, wherein the curvature rod structure obtained by the curvature rod structure design method is used at least in a buffer structure in the automobile or aerospace field.

[0106] The curvature rod structure is applied in the automobile B pillar, which can improve the impact load dispersion efficiency by 90%, and greatly enhance the vehicle collision safety. The curvature rod structure is applied in the aerospace buffer, which can reduce the weight by 40% under the premise of ensuring performance, and effectively reduce the load of the aerospace equipment.

[0107] Embodiment 4:

[0108] The present application also provides an electronic device, which can be a computer device, a single-chip microcomputer device, a smart mobile device, etc. The electronic device in the embodiment can include a processor, a memory, a transceiver component, etc. The memory, the processor and the transceiver component are connected through a bus; the memory can be used to store an execution program, and the exemplary execution program can include instructions; the processor is used to execute the instructions stored in the memory. The memory can also be used to store data, which can be called and / or modified when the instructions are executed.

[0109] The processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc., which are the computing core and control core of the terminal, and are suitable for implementing one or more instructions, and are specifically suitable for loading and executing one or more instructions in the storage medium to implement a corresponding method flow or a corresponding function, so as to implement the steps of the curvature rod structure design method in the above embodiment.

[0110] Embodiment 5:

[0111] Based on the same inventive concept, the present application also provides a readable storage medium, specifically an electronic device readable storage medium (Memory), which is a memory device in the electronic device and is used to store programs and data. It can be understood that the storage medium herein can include a built-in storage medium in the electronic device, and of course can also include an expansion storage medium supported by the electronic device. The storage medium provides a storage space, and the storage space stores an operating system of the terminal. Moreover, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and the instructions can be one or more execution programs (including program codes). It should be noted that the storage medium herein can be a high-speed RAM memory, or a non-volatile memory, such as at least one disk memory. Loading and executing one or more instructions stored in the storage medium by the processor can implement the steps of the curvature rod structure design method in the above embodiment.

[0112] Those skilled in the art will appreciate that embodiments of the present application can be readily used as software, hardware, or a combination of software and hardware. In a software embodiment, the methods can be tangibly embodied in a computer-readable storage medium having stored

[0113] The present application is described in reference to the flow diagrams and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the present application. It will be understood that each block of the flow diagrams and / or block diagrams, and combinations of blocks in the flow diagrams and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processing system or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flow diagrams and / or block diagrams block or blocks. Figure 1 one or more functions specified in the flow diagram and / or block diagram block or blocks. Figure 1 one or more functions specified in the flow diagram and / or block diagram block or blocks.

[0114] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flow diagram and / or block diagram block or blocks. Figure 1 one or more functions specified in the flow diagram and / or block diagram block or blocks. Figure 1 one or more functions specified in the flow diagram and / or block diagram block or blocks.

[0115] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flow diagram and / or block diagram block or blocks. Figure 1 one or more functions specified in the flow diagram and / or block diagram block or blocks. Figure 1 one or more functions specified in the flow diagram and / or block diagram block or blocks.

[0116] Finally, it should be noted that the above-described embodiments are merely intended for describing and illustrating, not limiting, the technical solutions of the present application, and the scope of protection of the present application is not limited by the above-described embodiments. Although the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that the technical personnel of the present application can make various changes, modifications or equivalent replacements to the specific embodiments of the present application after reading the present application. However, these changes, modifications or equivalent replacements are all within the scope of protection of the claims of the present application.

Claims

1. A method of designing a curved bar structure, characterized by, The method comprises the following steps: designing a preliminary curvature rod model by using simulation technology based on a constructed rod bending equation; setting a support point in the preliminary curvature rod model according to a curvature factor in the rod bending equation; determining a rod included angle by using a pre-constructed included angle formula; generating a final curvature rod model by using simulation technology based on the support point, the rod included angle and a preset target curvature factor.

2. The method of claim 1, wherein, The rod bending equation satisfies the following formula: y = A sin (0.1x) In the above formula, y is a curvature factor, x is an element of [0, 20π], and π is a circular constant.

3. The method of claim 2, wherein, The rod included angle satisfies the following formula: θ = 15°·(8-A) In the above formula, θ is a rod included angle, and A is a curvature factor.

4. The method of claim 1, wherein, The preliminary curvature rod model is a structure in which multiple rods are arranged in a uniform array around the periphery of a circular ring.

5. The method of claim 4, wherein, The material of the circular ring is structural steel, and the material of the rod is structural steel.

6. The method of claim 4, wherein, The rod is cylindrical.

7. The method according to any one of claims 1 to 6, characterized in that, After the final curvature rod model is generated by using simulation technology based on the support point, the rod included angle and the preset target curvature factor, the method comprises the following steps: printing the curvature rod model based on the curvature rod model to obtain a curvature rod structure drawing; manufacturing the curvature rod structure by using laser melting technology based on the curvature rod structure drawing.

8. The method of claim 7, wherein, After the curvature rod structure is manufactured by using laser melting technology based on the curvature rod structure drawing, the method comprises the following steps: adding a preset displacement threshold to the curvature rod structure to obtain a constrained curvature rod structure; performing a mechanical property test based on the constrained curvature rod structure to verify whether the curvature rod structure is qualified.

9. A curvature bar structure design system, characterized in that, The method comprises the following steps: a preliminary simulation module for designing a preliminary curvature rod model by using simulation technology based on a constructed rod bending equation; a setting module for setting a support point in the preliminary curvature rod model according to a curvature factor in the rod bending equation; a rod included angle is determined by using a pre-constructed included angle formula; a curvature rod model design module for generating a final curvature rod model by using simulation technology based on the support point, the rod included angle and a preset target curvature factor.

10. Use of a curvilinear rod structure, characterized in that The curvature rod structure obtained by the curvature rod structure design method of any one of claims 1-8 is used at least in a buffer structure in the fields of automobiles or aerospace.

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