Multistage energy absorption composite hybrid topology lattice structure and preparation process thereof
By fabricating a multi-stage energy absorption composite hybrid topology lattice structure, the problems of single energy absorption performance and stress concentration in aerospace structural components were solved, realizing multi-stage energy absorption and material optimization.
Patent Information
- Application Number
- CN202511015317.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-23
- Publication Date
- 2025-11-07
AI Technical Summary
Existing aerospace structural components with topological lattice structures suffer from limitations in energy absorption performance and stress concentration, leading to material waste and structural failure.
A fabrication process for a multi-stage energy absorption composite hybrid topological lattice structure is adopted. The outer shell and internal support IWP are generated through the Primitive equation, and Boolean operations are combined to form a composite hybrid topological lattice structure with two-stage energy absorption. Laser powder bed melting (SLM) technology is used for printing and surface treatment.
It achieves multi-stage energy absorption, disperses stress concentration, improves energy absorption performance, extends the service life of the structure, and reduces material waste.
Smart Images
Figure CN120911017A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the field of structural topology optimization, and particularly relates to a multi-stage energy absorption composite hybrid topology lattice structure for aerospace structures and a preparation process thereof. BACKGROUND
[0002] In order to improve the flight distance of an aircraft, in addition to improving the thrust of the engine of the aircraft, the mass of the aircraft is also an important influencing factor. In the process of flight of the aircraft, collision will inevitably occur, and it is necessary to ensure that the aircraft will not cause fatal damage to the core components of the aircraft after the collision, so the energy absorption performance of the structural member is crucial. At the present stage, the performance of the block material far exceeds the actual performance requirement, which will lead to a lot of material waste. In order to save materials and costs, and make full use of each material, lightweight design is required.
[0003] Lightweight design is a technology that can provide equal or enhanced performance while reducing mass through advanced engineering techniques and engineering materials. The first lightweight structure developed is a honeycomb topology structure, and since the size, shape and distribution of the holes are random and uncontrollable, the performance is unstable. Therefore, the second type of truss topology structure is developed, which is composed of crossbars and support points, but stress concentration is prone to occur at the support points connected by the crossbars, which can easily lead to fracture and further cause the entire structural member to fail prematurely. In order to solve the stress concentration problem of the truss topology lattice structure, a three-period minimal surface topology lattice structure is developed. The inside is a smooth surface, which greatly reduces the stress concentration effect. In addition, the entire structure is controlled by a mathematical formula, and by controlling the mathematical formula, the size, distribution and shape of the holes can be adjusted to control the performance and achieve the expected performance. However, the energy absorption of the uniform and single three-period minimal surface is relatively single. SUMMARY
[0004] In view of the above technical problems, the present application provides a multi-stage energy absorption hybrid topology lattice structure for aerospace structures and a preparation process thereof, which can relieve stress concentration and provide multi-stage energy absorption.
[0005] The present application achieves the above technical purposes through the following technical means.
[0006] A preparation process of a multi-stage energy absorption composite hybrid topology lattice structure, comprising the following steps:
[0007] Step S1, design a model: use software to design a composite hybrid topological lattice structure model, generate an outer shell P through the equation of Primitive, generate an internal support IWP through the generating equation of IWP, and combine the outer shell P and the internal support IWP through Boolean operation to form a composite hybrid topological lattice structure with two-stage energy absorption, the generating equation of the outer shell P is:
[0008] F(x,y,z)=cos(X)+cos(Y)+cos(Z)=C
[0009] The generating equation of the internal support IWP is: F(x,y,z)=2[cos(X)cos(Y)+cos(Y)cos(Z)+cos(Z)cos(X)]-[cos(2X)+cos(2Y)+cos(2Z)]=C
[0010] X, Y, Z are three-dimensional space rectangular coordinate system, respectively represent the length in X, Y, Z three directions, the size of X, Y, Z determines the size of the unit cell, C is the length, used to determine the wall thickness of the structure;
[0011] Step S2, print the model: use laser powder bed fusion SLM technology to print the designed model, and then remove the powder on the surface of the printed sample;
[0012] Step S3, subsequent processing of the printed model: take out the printed sample, pour out the excess powder, and then further remove the powder adhered to the surface of the sample.
[0013] In the above scheme, the step S1 uses nTopology software to design a composite hybrid topological lattice structure model, then applies the same force to the hybrid topological lattice structures with different design parameters through finite element analysis, compares the compressed lengths, and selects the model with the longest remaining length as the preferred model.
[0014] Further, the step S1 applies a force of 10 WN to the hybrid topological lattice structures with different design parameters, compares the compressed lengths, and selects the model with a remaining length of 8.9 mm or more as the preferred model.
[0015] In the above scheme, the generating equation of the outer shell P of the composite hybrid topological lattice structure is:
[0016] F(x,y,z)=cos(X)+cos(Y)+cos(Z)=C
[0017] Wherein, X=4πx, Y=4πy, Z=4πz, C=0.106;
[0018] The generating equation of the internal support IWP is: F(x, y, z) = 2[cos(X)cos(Y) + cos(Y)cos(Z) + cos(Z)cos(X)] - [cos(2X) + cos(2Y) + cos(2Z)] = C
[0019]
[0020] Wherein, X = 4πx, Y = 4πy, Z = 4πz, C = 0.43;
[0021] The size of X, Y and Z in the equation determines the size of the unit cell. The internal support IWP is removed from the four edge sharp corners by Boolean subtraction operation, and then the shell P is combined with the internal support IWP by Boolean intersection operation, and the fillet radius R at the connection is set to 1.1mm.
[0022] In the above scheme, the generating equation of the shell P of the composite hybrid topological point lattice structure is:
[0023] F(x, y, z) = cos(X) + cos(Y) + cos(Z) = C
[0024] Wherein, X = 4πx, Y = 4πy, Z = 4πz, C = 0.12;
[0025] The generating equation of the internal support IWP is: F(x, y, z) = 2[cos(X)cos(Y) + cos(Y)cos(Z) + cos(Z)cos(X)] - [cos(2X) + cos(2Y) + cos(2Z)] = C
[0026]
[0027] Wherein, X = 4πx, Y = 4πy, Z = 4πz, C = 0.416;
[0028] The size of X, Y and Z in the equation determines the size of the unit cell. The internal support IWP is removed from the four edge sharp corners by Boolean subtraction operation, and then the shell P is combined with the internal support IWP by Boolean intersection operation, and the fillet radius R at the connection is set to 1.1mm.
[0029] In the above scheme, the minimum side length of the composite hybrid topological point lattice structure should be greater than or equal to 30mm.
[0030] Further, the size of the composite hybrid topological point lattice structure is 40mm*40mm*40mm, the size of the unit cell is 8mm*8mm*8mm, and the porosity is 75%.
[0031] In the above scheme, in step S2, Ti6Al4V titanium alloy powder is used as raw material, and laser powder bed melting SLM technology is used for printing.
[0032] In the scheme, in the step S2, the printing parameters are: laser power is 300w, scanning speed is 600mm / s, scanning interval is 0.07mm, and layer thickness is 30um, so that the defects such as pores in the printed sample are reduced, and the density of the sample is increased.
[0033] In the scheme, the sand blasting technology is used in the steps S2 and S3 to remove powder from the surface.
[0034] A multi-stage energy absorption composite hybrid topological dot array structure is prepared according to the preparation process of the multi-stage energy absorption composite hybrid topological dot array structure.
[0035] Compared with the prior art, the beneficial effects of the present application are:
[0036] The present application takes the enhancement of the energy absorption of the topological structure as the starting point, optimizes the topological dot array structure, and prepares a multi-stage energy absorption composite hybrid topological dot array structure for aerospace structural parts, which has multi-stage energy absorption characteristics, can effectively increase the energy absorption performance, and realizes the multi-stage energy absorption effect.
[0037] The multi-stage energy absorption composite hybrid topological dot array structure generates the shell P through the equation of Primitive, generates the internal support IWP through the generation equation of IWP, and combines the shell P and the internal support IWP through Boolean operation to form a composite hybrid topological dot array structure with two-stage energy absorption. Since the support of the IWP structure is added in the hollow space of Primitive, after the energy absorption of the first-stage Primitive shell reaches the limit, the second-stage IWP continues to absorb energy, so compared with the traditional single-stage energy absorption, it has multi-stage energy absorption characteristics and better energy absorption performance.
[0038] The present application can well disperse stress concentration after adding IWP, so as to change the original shear fracture into layer-by-layer fracture. The first-stage yield strength is lower, which provides a good soft contact. The second-stage yield strength is higher, which provides a larger energy absorption range, and has good application prospect in energy absorption application. BRIEF DESCRIPTION OF DRAWINGS
[0039] Figure 1 It is a preparation process flow diagram of the multi-stage energy absorption composite hybrid topological dot array structure of the present application;
[0040] Figure 2 It is a combination diagram of the shell P and the internal support IWP of the multi-stage energy absorption composite hybrid topological dot array structure of the present application;
[0041] Figure 3A schematic diagram of a multi-stage energy absorption composite hybrid topological lattice structure of the present application is shown in FIG. 1, wherein, Figure 3 (a) is a schematic diagram of a unit cell, Figure 3 (b) is a schematic diagram of a unit cell cross section, Figure 3 (c) is a schematic diagram of a whole sample, Figure 3 (d) is a photograph of a sample,
[0042] Figure 4 A schematic diagram of a sample model is shown in FIG. 2, wherein, Figure 4 (a) is a sample model No. 1, Figure 4 (b) is a photograph of sample No. 1, Figure 4 (c) is a unit cell size of sample No. 1, Figure 4 (d) is a sample model No. 2, Figure 4 (e) is a photograph of sample No. 2, Figure 4 (f) is a unit cell size of sample No. 2, Figure 4 (g) is a sample model No. 3, Figure 4 (h) is a photograph of sample No. 3, Figure 4 (i) is a unit cell size of sample No. 3,
[0043] Figure 5 A compressive stress-strain curve of the present application is shown in FIG. 3,
[0044] Figure 6 A specific strength diagram of the present application is shown in FIG. 4,
[0045] Figure 7 An energy absorption curve of the present application is shown in FIG. 5. DETAILED DESCRIPTION
[0046] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. The features in the embodiments of the present application can be combined with each other without conflict. In addition, in the following embodiments, the preparation process is a conventional means in the prior art unless otherwise specified, therefore, it will not be described in detail; the raw materials used in the following embodiments are all commercially available products;
[0047] Figure 1 A preferred embodiment of a preparation process of a multi-stage energy absorption composite hybrid topological lattice structure of the present application is shown in FIG. 6, wherein the preparation process of the multi-stage energy absorption composite hybrid topological lattice structure comprises the following steps:
[0048] Step S1, design model: use nTopology software to design different composite hybrid topological lattice structure models, generate shell P through the equation of Primitive, generate internal support IWP through the equation of IWP, combine shell P and internal support IWP through Boolean operation to form a composite hybrid topological lattice structure with two-stage energy absorption, Figure 2 The combination of the shell P and the internal support IWP of the multistage energy absorption composite hybrid topological lattice structure of the application is shown in the schematic diagram.
[0049] The generating equation of the shell P is:
[0050] F(x,y,z)=cos(X)+cos(Y)+cos(Z)=C
[0051] The generating equation of the internal support IWP is: F(x,y,z)=2[cos(X)cos(Y)+cos(Y)cos(Z)+cos(Z)cos(X)]-[cos(2X)+cos(2Y)+cos(2Z)]=C
[0052] X, Y, Z are three-dimensional space rectangular coordinate system, respectively represent the length in X, Y, Z three directions, the size of X, Y, Z determines the size of unit cell, C is length, used to determine the wall thickness of the structure;
[0053] Then, through finite element analysis, the hybrid topological lattice structures with different design parameters are subjected to the same force, and by comparing the compressed length, the groups of models with longer remaining length are selected as the preferred models for printing. Figure 3 The multistage energy absorption composite hybrid topological lattice structure for aerospace structural parts of the application is shown in the schematic diagram, wherein, Figure 3 (a) is a schematic diagram of a unit cell, Figure 3 (b) is a schematic diagram of a unit cell cross section, Figure 3 (c) is a schematic diagram of the whole sample, Figure 3 (d) is a photograph of the sample;
[0054] Step S2, print model: use laser powder bed fusion SLM technology to print the designed model with Ti6Al4V powder as raw material, and then use sand blasting and other technologies to remove the powder on the surface of the printed sample;
[0055] Step S3, subsequent processing of the printed model: take out the printed sample, pour out the excess powder, and then perform sand blasting treatment on the sample to further remove the powder adhered to the surface.
[0056] The step S1 uses nTopology software to design different composite hybrid topological lattice structure models, and then applies the same force to the hybrid topological lattice structures with different design parameters through finite element analysis, and selects the model with the longest remaining length as the preferred model by comparing the compressed lengths.
[0057] The step S1 applies a force of 10 WN to the hybrid topological lattice structures with different design parameters, and selects the model with a remaining length of 8.9 mm or more as the preferred model by comparing the compressed lengths.
[0058] Considering that the three-period minimal surface has a large specific surface area, which means that more semi-melted powder will be bonded to the surface of the sample, thereby causing a difference between the actual porosity and the designed porosity, therefore, in step S1, the size should be as large as possible, preferably, the minimum edge length of the structure should be greater than or equal to 30 mm, thereby reducing the error.
[0059] Preferably, the size of the composite hybrid topological lattice structure is 40 mm*40 mm*40 mm, the unit cell size is 8 mm*8 mm*8 mm, and the porosity is 75%.
[0060] In this embodiment, in step S1, the advantages and disadvantages of various three-period minimal surface uniform unit cells are obtained through finite element analysis, and then suitable unit cells are selected to form a hybrid cell; for hybrid topological lattice structures with different design parameters, several groups of optimal models are selected by using finite element analysis, the principle of which is that the same force is applied to the hybrid topological lattice structures with different design parameters, and the several groups of models with longer lengths are selected as the optimal models by comparing the compressed lengths. Preferably, in step S1, a force of 10 WN is applied to the hybrid topological lattice structures with different design parameters, and the model with a remaining length of 8.9 mm or more is selected as the preferred model by comparing the compressed lengths.
[0061] Figure 4 The sample model is shown, and the Primitive (P) topological lattice structure is selected as the control group, with a wall thickness of 0.1455 mm, denoted as sample No. 1, Figure 4 (a) is the sample model No. 1, Figure 4 (b) is the physical sample No. 1, Figure 4 (c) is the unit cell size of sample No. 1; the hybrid topological lattice structure is a composite of Primitive (P) and Imaginary Wrapped Package (IWP), and there are two parameter samples; the wall thickness of the P hybrid topological lattice structure No. 2 is 0.106 mm, the wall thickness of the IWP hybrid topological lattice structure is 0.43 mm, and the radius R at the connection between the two is 1.1 mm, Figure 4 (d) is the sample model No. 2, Figure 4 (e) is the physical sample No. 2,Figure 4 (f) is the unit cell size of sample No. 2; No. 3 composite hybrid topological lattice structure P wall thickness is 0.12mm, IWP wall thickness is 0.416mm, the connection radius R is 1.1mm, Figure 4 (g) is the model of sample No. 3, Figure 4 (h) is the physical object of sample No. 3, Figure 4 (i) is the unit cell size diagram of sample No. 3; all sample sizes are 40*40*40mm, the unit cell size is 8*8*8mm, and the porosity is 75%.
[0062] The equation of sample No. 1 is:
[0063] F(x,y,z)=cos(X)+cos(Y)+cos(Z)=C,
[0064] wherein X=4πx, Y=4πy, Z=4πz, C=0.1455;
[0065] The generating equation of the shell P of the No. 2 composite hybrid topological lattice structure is:
[0066] F(x,y,z)=cos(X)+cos(Y)+cos(Z)=C
[0067] wherein X=4πx, Y=4πy, Z=4πz, C=0.106;
[0068] The generating equation of the internal support IWP is: F(x,y,z)=2[cos(X)cos(Y)+cos(Y)cos(Z)+cos
[0069] (Z)cos(X)]-[cos(2X)+cos(2Y)+cos(2Z)]=C
[0070] wherein X=4πx, Y=4πy, Z=4πz, C=0.43;
[0071] The size of X, Y and Z in the equation determines the size of the unit cell. The internal support IWP is removed from the four edge sharp corners by Boolean subtraction operation, and then the shell P is combined with the internal support IWP by Boolean intersection operation, and the fillet radius R of the connection is set to 1.1mm.
[0072] The generating equation of the shell P of the No. 3 composite hybrid topological lattice structure is:
[0073] F(x,y,z)=cos(X)+cos(Y)+cos(Z)=C
[0074] wherein X=4πx, Y=4πy, Z=4πz, C=0.12;
[0075] The generating equation of the internal support IWP is: F(x,y,z) = 2[cos(X)cos(Y)+cos(Y)cos(Z)+cos
[0076] (Z)cos(X)]-[cos(2X)+cos(2Y)+cos(2Z)]=C
[0077] Wherein, X = 4πx, Y = 4πy, Z = 4πz, C = 0.416;
[0078] The size of X, Y and Z in the equation determines the size of the unit cell, the internal support IWP is removed from the four edge sharp corners through Boolean subtraction operation, then the shell P is combined with the internal support IWP through Boolean intersection operation, and the fillet radius R at the connection is set to 1.1mm.
[0079] In the embodiment, the step S2 uses Ti6Al4V titanium alloy powder as raw material, uses laser powder bed melting (SLM) technology to print, adjusts layer thickness, scanning speed, scanning interval, spot size and other parameters to control energy input, compares different printing parameters, and selects optimal printing parameters: laser power is 300w, scanning speed is 600mm / s, scanning interval is 0.07mm, and layer thickness is 30μm, so that the porosity and other defects in the printed sample are reduced, and the density of the sample is increased.
[0080] In the embodiment, the step S3 is to reverse the powder of the printed sample, and then subsequent treatment such as sand blasting is carried out to remove excess powder and reduce the deviation between actual porosity and designed porosity.
[0081] The present application uses ntopology software for three-dimensional design and SLM technology to prepare a Primitive (P) and IWP (I-Wrapped Package) multi-stage energy absorption composite hybrid topological point lattice structure, and stress concentration is relieved by adding the IWP (I-Wrapped Package) structure in the Primitive (P).
[0082] Figure 5 The compression stress-strain curve of the present application is shown in the figure, Figure 5 It can be seen that: the No. 1 sample is quickly broken after yielding, only one stage of energy absorption, but the No. 2 and No. 3 samples can continue to absorb energy after yielding, and have two stages of yield and energy absorption, Figure 6 The specific diagram of the specific strength of the present application is shown in the figure, Figure 6It can be seen that although the tensile strength of the second and third samples is lower than that of the first sample, the energy absorption is much greater than that of the first sample.
[0083] Figure 7 The energy absorption curve of the application is shown in the figure from Figure 7 It can be seen that the energy absorption of the second and third samples is much greater than that of the first sample, and after the strain of the first sample breaks, the second and third samples can continue to absorb energy, which can effectively increase the energy absorption performance and achieve multi-stage energy absorption effect.
[0084] The results show that, compared with the original structure (the first sample), the multi-stage energy absorption composite hybrid topological lattice structure (the second and third samples) has two stages of energy absorption, and the two-stage yield strength is higher than the one-stage yield strength of the original structure. Since the support of the IWP structure is added in the hollow space of the Primitive, after the energy absorption of the one-stage Primitive shell reaches the limit, the two-stage IWP continues to absorb energy, thus having more excellent energy absorption.
[0085] Since the original Primitive structure has a ring-shaped stress concentration area, the stress concentration can be well dispersed after the addition of IWP, thereby changing the original shear fracture into layer-by-layer fracture. The one-stage yield strength is lower, providing a good soft contact, and the two-stage yield strength is higher, providing a larger energy absorption interval. Compared with the traditional topological lattice structure, the multi-stage energy absorption composite hybrid topological lattice structure has a multi-stage energy absorption effect, greatly improving the energy performance, and has good application prospects in energy absorption applications.
[0086] The above shows and describes the basic principles and main features of the application and the advantages of the application. For those skilled in the art, it is obvious that the application is not limited to the details of the above exemplary embodiments, and the application can be implemented in other specific forms without departing from the spirit or essential characteristics of the application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the application. Any reference signs in the claims should not be considered as limiting the claims involved.
[0087] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments that those skilled in the art can understand.
Claims
1. A process for the preparation of a multi-stage energy-absorbing composite hybrid topological lattice structure, characterized in that, The method comprises the following steps: Step S1, designing a model: using software to design a composite hybrid topological lattice structure model, generating an outer shell P through a Primitive equation, generating an internal support IWP through an IWP generating equation, and combining the outer shell P and the internal support IWP through Boolean operation to form a composite hybrid topological lattice structure with two-stage energy absorption, the generating equation of the outer shell P is: F(x,y,z)=cos(X)+cos(Y)+cos(Z)=C The generating equation of the internal support IWP is: F(x,y,z)=2[cos(X)cos(Y)+cos(Y)cos(Z)+cos(Z)cos(X)]-[cos(2X)+cos(2Y)+cos(2Z)]=C X, Y, Z are three-dimensional space rectangular coordinate system, respectively representing the length in X, Y, Z three directions, the size of X, Y, Z determines the size of the unit cell, and C is the length, which is used to determine the wall thickness of the structure; Step S2, printing the model: using laser powder bed fusion SLM technology to print the designed model, and then removing the powder on the surface of the printed sample; Step S3, subsequent processing of the printed model: taking out the printed sample, pouring away the excess powder, and then further removing the powder adhered to the surface of the sample.
2. The process for the preparation of a multistage energy-absorbing composite hybrid topological lattice structure according to claim 1, characterized in that, In step S1, the nTopology software is used to design a composite hybrid topological lattice structure model, and then the same force is applied to the hybrid topological lattice structures with different design parameters through finite element analysis, and the model with a longer remaining length is selected as the preferred model by comparing the compressed lengths.
3. The process for the preparation of a multistage energy-absorbing composite hybrid topological lattice structure according to claim 2, characterized in that, In step S1, a force of 10 WN is applied to the hybrid topological lattice structures with different design parameters, and the model with a remaining length of more than 8.9 mm is selected as the preferred model by comparing the compressed lengths.
4. The process for the preparation of a multistage energy-absorbing composite hybrid topological lattice structure according to claim 1, characterized in that, The generating equation of the outer shell P of the composite hybrid topological lattice structure is: F(x,y,z)=cos(X)+cos(Y)+cos(Z)=C Wherein, X=4πx, Y=4πy, Z=4πz, C=0.106; The generating equation of the internal support IWP is: F(x,y,z)=2[cos(X)cos(Y)+cos(Y)cos(Z)+cos(Z)cos(X)]-[cos(2X)+cos(2Y)+cos(2Z)]=C Wherein, X=4πx, Y=4πy, Z=4πz, C=0.43; The size of X, Y and Z in the equation determines the size of the unit cell, the internal support IWP is removed through Boolean subtraction operation, then the outer shell P and the internal support IWP are combined through Boolean intersection operation, and the fillet radius R of the connection is set to 1.1 mm.
5. The process for the preparation of a multistage energy-absorbing composite hybrid topological lattice structure according to claim 1, wherein, The generating equation of the outer shell P of the composite hybrid topological lattice structure is: F(x,y,z)=cos(X)+cos(Y)+cos(Z)=C Wherein, X=4πx, Y=4πy, Z=4πz, C=0.12; The generating equation of the internal support IWP is: F(x, y, z) = 2[cos(X)cos(Y) + cos(Y)cos(Z) + cos(Z)cos(X)] - [cos(2X) + cos(2Y) + cos(2Z)] = C Wherein, X = 4πx, Y = 4πy, Z = 4πz, C = 0.416; The size of X, Y and Z in the equation determines the size of the unit cell, the internal support IWP is removed from the four edge sharp corners through the Boolean subtraction operation, then the shell P is combined with the internal support IWP through the Boolean intersection operation, and the fillet radius R of the connection is set to 1.1mm.
6. The process for the preparation of a multistage energy-absorbing composite hybrid topological lattice structure according to claim 1, characterized in that, The minimum side length of the composite hybrid topological lattice structure should be greater than or equal to 30mm.
7. The process for the preparation of a multistage energy-absorbing composite hybrid topological lattice structure according to claim 6, characterized in that, The size of the composite hybrid topological lattice structure is 40mm*40mm*40mm, the size of the unit cell is 8mm*8mm*8mm, and the porosity is 75%.
8. The process for the preparation of a multistage energy-absorbing composite hybrid topological lattice structure according to claim 1, characterized in that, In the step S2, Ti6Al4V titanium alloy powder is used as raw material, and laser powder bed melting SLM technology is used for printing.
9. The process for the preparation of a multistage energy-absorbing composite hybrid topological lattice structure according to claim 1, characterized in that, In the step S2, the printing parameters are: laser power is 300w, scanning speed is 600mm / s, scanning interval is 0.07mm, and layer thickness is 30μm.
10. A multi-stage energy-absorbing composite hybrid topological lattice structure, characterized in that, The preparation process of the multi-stage energy absorption composite hybrid topological lattice structure according to any one of claims 1-9. The preparation process of the multi-stage energy absorption composite hybrid topological lattice structure according to any one of claims 1-9.