Tough structure additive manufacturing method based on single-material multiple-printing-parameter combination and application of tough structure additive manufacturing method

Abstract

The invention provides a tough structure additive manufacturing method based on combination of multiple printing parameters of a single material and application of the tough structure additive manufacturing method, and belongs to the technical field of additive manufacturing. According to the method, alternating deposition of a single material and two kinds of printing parameter combinations is utilized to optimize the strength and toughness performance, key printing parameters are adopted to construct an experimental matrix, the quantitative relation between the parameters and key mechanical properties is established in combination with a response surface model, two kinds of different printing parameter combinations are obtained through a multi-objective optimization method, and the mechanical properties are optimized. Wherein one group of parameter combination can realize stronger mechanical properties, and the other group of parameter combination can provide weaker interlayer and intertow mechanical properties. By alternately using the two parameter combinations, the alternate structure of the strong phase and the weak phase in the additive manufacturing part is achieved. According to the manufacturing method, the mechanical property of the bionic layered structure obtained through additive manufacturing can be optimized, the multi-material compatibility problem is avoided, the manufacturing process is simplified, the cost is reduced, the manufacturing efficiency is improved, the energy absorption capacity and the impact strength are improved, and the manufacturing method can adapt to complex structural design.

Description

Technical Field

[0001] The present invention belongs to the technical field of additive manufacturing, relates to the process of additive manufacturing, and relates to data acquisition / data processing for controlling or regulating the additive manufacturing process, and specifically relates to a method for additive manufacturing of a strong and tough structure based on a single-material combination of multiple printing parameters and its application. Background Art

[0002] Additive Manufacturing (AM) technology, especially 3D printing technology, has developed rapidly in recent years and has been widely used in aerospace, automotive, medical, construction and other fields. Due to its unique molding method, it can directly manufacture parts of complex shapes according to digital models and reduce waste during design. Therefore, additive manufacturing has become one of the core technologies in many industries. However, existing additive manufacturing technologies still face many challenges, especially in optimizing the mechanical properties of printed materials. Common additive manufacturing technologies usually use a single material and a single printing parameter. Although this method can realize the manufacture of structures, it often cannot simultaneously meet complex application scenarios with high requirements for strength and toughness.

[0003] To solve this problem, researchers have tried to optimize the mechanical properties of materials by adjusting printing parameters. Different printing parameters, such as printing temperature, printing speed, layer height, base plate temperature, etc., directly affect the mechanical properties of printed materials, including strength, toughness, impact resistance, etc. However, existing technologies mainly focus on using a single combination of printing parameters to optimize the performance of a single material. For example, based on the adjustment of parameters such as printing temperature, layer height, and printing speed, studies have attempted to improve the tensile strength, compressive strength, and impact resistance of materials. However, the limitation of these methods is that they cannot take into account the different mechanical properties of materials, resulting in the inability to achieve a balance between high strength and high toughness in some engineering applications, resulting in the comprehensive mechanical properties of additively manufactured parts being limited.

[0004] As a result, some studies have begun to explore multi-material additive manufacturing methods, aiming to achieve performance adjustments in different areas by combining different materials. For example, by alternating between different materials or material combinations during the printing process, researchers hope to achieve structural diversity and performance optimization. However, the technology of using multi-material printing still faces many challenges, such as poor compatibility between materials, poor interlayer bonding, and mismatched thermal expansion coefficients. Therefore, the existing multi-material additive manufacturing technology is difficult to be widely used in the actual manufacturing of structures requiring high strength and toughness.

[0005] In summary, additive manufacturing under existing technologies has the following problems: (1) Mechanical properties balance problem: Existing technologies usually rely on a combination of a single material and a single printing parameter to optimize the mechanical properties of the material. However, this method can often only optimize one aspect of the material's performance (such as strength or toughness), but it is difficult to take both strength and toughness into account at the same time, resulting in insufficient mechanical properties of additively manufactured parts in actual applications, and unable to meet the structural requirements of high strength and high toughness.

[0006] (2) Compatibility issues of multi-material additive manufacturing: Although multi-material additive manufacturing can adjust the performance of different regions by combining different materials, multi-material printing technology still faces many challenges, such as poor compatibility between materials, poor interlayer bonding, mismatched thermal expansion coefficients, etc. These problems not only affect the overall performance of additively manufactured parts, but also increase manufacturing costs, limiting their widespread application.

[0007] (3) Complex manufacturing process and high cost: Existing multi-material additive manufacturing methods usually require the use of multiple materials and complex printing processes, which not only increases the difficulty of manufacturing, but also increases production costs. In addition, material selection and adjustment of printing parameters are too dependent on experimental experience and lack a systematic optimization method, resulting in limited effect in the application of high-strength and toughness structures.

[0008] Therefore, how to regulate the mechanical properties of different areas through a reasonable combination of printing parameters, and then synergistically optimize the strength and toughness of additively manufactured parts, is a technical problem that needs to be solved urgently. Summary of the invention

[0009] The present invention is made to solve the above-mentioned problems, and aims to provide a method for additive manufacturing of a strong and tough structure based on a combination of multiple printing parameters of a single material and its application.

[0010] The present invention provides a method for additive manufacturing of a strong and tough structure based on a combination of multiple printing parameters of a single material, which has the following characteristics and includes the following steps: S10, selecting a single material suitable for additive manufacturing, the single material having adjustable brittle and plastic properties; S20, selecting mechanical properties for modeling in the single material; S30, selecting printing parameters to be optimized in the additive process; S40, after designing an experimental matrix for the single material, establishing a mathematical model between the mechanical properties and printing parameters of the single material by means of a response surface method; S50, according to the mathematical model, determining two groups of printing parameter combinations that produce the strongest comprehensive mechanical properties and the weakest comprehensive mechanical properties respectively by means of a multi-objective optimization method; S60, performing additive manufacturing by alternatingly using a combination of printing parameters with the strongest comprehensive mechanical properties and a combination of printing parameters with the weakest comprehensive mechanical properties, thereby achieving alternating deposition of strong phases and weak phases in the same additive manufacturing sample, and constructing a bionic layered structure of alternating strong / weak phases with soft / hard filament and interlayer interface properties.

[0011] The method for manufacturing a strong and tough structure based on a single material and a combination of multiple printing parameters provided by the present invention may also have the following characteristics: wherein, in step S10, the single material includes Onyx.

[0012] In the method for manufacturing a strong and tough structure based on a combination of multiple printing parameters of a single material provided by the present invention, the following features may also be provided: wherein, in step S20, the mechanical properties include tensile strength TS, tensile modulus TM, interfilament bonding strength IF-TS, interfilament bonding modulus IF-TM and interlaminar shear strength ILSS; in step S30, the printing parameters include printing temperature T n , Printing speed S p , Print layer height LT And the extrusion multiple EM .

[0013] In the method for manufacturing strong and tough structures based on a single material and a combination of multiple printing parameters provided by the present invention, it can also have the following characteristics: wherein, in step S40, the test matrix includes: stretching the single material at 0° in the X direction to test the tensile modulus TM and the tensile strength TS; stretching the single material at 90° in the Y direction to test the inter-filament bonding strength IF-TS and the inter-filament bonding modulus IF-TM; and short beam shear test in the Z direction to test the interlayer shear strength ILSS.

[0014] The method for manufacturing a strong and tough structure based on a combination of multiple printing parameters of a single material provided by the present invention may also have the following characteristics: wherein, in step S50, the combination of the printing parameters with the weakest comprehensive mechanical properties is: , The combination of printing parameters with the strongest comprehensive mechanical properties is: , And 260 ℃ ≤ T n ≤290℃,0.1mm≤ LT ≤0.2 mm, 20 mm / s≤ S p ≤60 mm / s, 95 %≤ EM ≤105%, where x Indicates different combinations of printing parameters. f 1( x ) is used to express the tensile modulus TM and tensile strength TS of a single material in the X-direction 0° tensile property. f 2( x ) is a comprehensive performance used to represent the inter-filament performance and inter-layer performance of IF-TS, IF-TM and ILSS of a single material.

[0015] In the method for additive manufacturing of strong and tough structures based on a single material and a combination of multiple printing parameters provided by the present invention, the following characteristics may also be provided: wherein, a combination of printing parameters with the strongest comprehensive mechanical properties is used to optimize TS, TM, IF-TS, IF-TM and ILSS of a single material, so as to adapt to structures requiring high-strength performance, and a combination of printing parameters with the weakest comprehensive mechanical properties is used to optimize the plasticity and toughness of the strong phase, so that the single material has better energy absorption capacity and impact strength.

[0016] The method for additive manufacturing of strong and tough structures based on a single material and a combination of multiple printing parameters provided by the present invention may also have such characteristics, and also include the following steps: S70, determining the energy absorption value of the bionic layered structure through a Charpy impact test, determining the strain distribution and energy absorption behavior of the bionic layered structure during the bending process through a three-point bending test combined with DIC technology, and obtaining its crack propagation mechanism and energy absorption path through SEM image analysis of internal microstructure damage and DIC image analysis of strain field changes of the bionic layered structure in the Charpy impact test and three-point bending test; S80, combining the test results in step S70 to verify the strength and energy absorption characteristics of the bionic layered structure.

[0017] The present invention also provides an application of any of the aforementioned methods for additive manufacturing of strong and tough structures based on a single material and a combination of multiple printing parameters in aerospace, automotive industry, protective equipment and sports equipment.

[0018] According to the invention, a method for manufacturing a strong and tough structure based on a combination of multiple printing parameters of a single material and its application, because the alternating deposition printing of a single material and two printing parameter combinations is used to optimize the strength and toughness, by selecting several printing parameters (such as printing temperature, printing speed, layer height, extrusion multiple, etc.) that are most relevant to the mechanical properties of additively manufactured parts (including strength, toughness, bonding performance between tows and layers, etc.), after designing a test matrix of a single material, a mathematical model between the mechanical properties of a single material and printing parameters is established by the response surface method, and two different printing parameter combinations are obtained by the multi-objective optimization (MOO) method, one of which can achieve stronger mechanical properties, and the other provides weaker mechanical properties between layers and tows. By alternating the use of these two parameter combinations, an alternating structure of strong and weak phases in additively manufactured parts is achieved.

[0019] Therefore, the method for manufacturing a strong and tough structure based on a combination of multiple printing parameters of a single material and its application have the following beneficial effects: (1) Optimizing mechanical properties: By alternating between two different printing parameter combinations (i.e., the printing parameter combinations that achieve the strongest and weakest mechanical properties, respectively) during the additive manufacturing process, mechanical properties can be adjusted on a single material. By alternating deposition to form a strong and weak phase alternating structure, additively manufactured parts can have both excellent strength and toughness in the same component, meeting complex application scenarios with high strength and high toughness requirements.

[0020] (2) Avoiding the compatibility issues of multiple materials: Unlike the multi-material additive manufacturing method, the present invention uses only a single material and adjusts the mechanical properties of different regions by optimizing the combination of printing parameters. This not only avoids the problems of poor compatibility, poor interlayer bonding, and mismatched thermal expansion coefficients that may arise between multiple materials, but also greatly reduces the cost of materials and the complexity of manufacturing.

[0021] (3) Simplify the manufacturing process, reduce costs, and improve manufacturing efficiency: Compared with the existing multi-material additive manufacturing technology, the present invention only needs to optimize two printing parameter combinations, which simplifies the manufacturing process, reduces material switching and printing pause time, and thus improves manufacturing efficiency. In addition, the alternating deposition method reduces the complexity of material selection and switching, reduces material waste, and reduces production costs. At the same time, the optimized printing parameter combination provides a more systematic solution, reduces blindness in the experiment, and improves the stability of the process.

[0022] (4) Improving energy absorption capacity and impact strength: The additive parts manufactured by the method of the present invention not only have high bending strength and stiffness in terms of mechanical properties, but also have strong toughness, which can effectively improve the energy absorption capacity and impact strength, and are suitable for high-demand engineering applications, such as aerospace, automobile and other fields.

[0023] (5) Adaptability to complex structural design: The design method provided by the present invention can realize the manufacturing of complex bionic layered structures. By precisely controlling the printing parameters of each layer, a structure with a soft / hard interface and alternating strength and toughness can be manufactured, which is suitable for high-performance fields such as aerospace and automobiles, and expands the application scope of 3D printing technology.

[0024] (6) The present invention provides a new idea for the application of additive manufacturing technology in high-strength and toughness structures. It can manufacture structural parts with excellent strength and toughness based on a single material by adjusting and alternating two printing parameter combinations, significantly improving the energy absorption capacity and impact strength of the material, solving the technical difficulties of traditional multi-material additive manufacturing, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1It is a flowchart of a method for additively manufacturing a strong and tough structure based on a combination of multiple printing parameters of a single material in an embodiment of the present invention.

[0026] Figure 2 It is a technical roadmap for a method for additively manufacturing a strong and tough structure based on a combination of multiple printing parameters of a single material in an embodiment of the present invention.

[0027] Figure 3 3 is a comparison of the Charpy impact test (pendulum impact) results in step S71 in the embodiment of the present invention, wherein S is a pure strong phase, W is a pure weak phase, and SW is a strong-weak alternating phase.

[0028] Figure 4 3 is a comparison of the static three-point bending stiffness, strength and energy absorption results in step S72 in the embodiment of the present invention, wherein S is a pure strong phase, W is a pure weak phase, and SW is a strong-weak alternating phase.

[0029] Figure 5 This is an analysis of the strength / toughness mechanism of the bionic hierarchical structure of the strong and tough structure additive manufacturing method based on a single material and a combination of multiple printing parameters in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following embodiments, in conjunction with the accompanying drawings, specifically illustrate the present invention's method for additive manufacturing of a strong and tough structure based on a single material and a combination of multiple printing parameters and its application.

[0031] <Example> Figure 1 is a flowchart of a method for additively manufacturing a strong and tough structure based on a combination of multiple printing parameters of a single material in an embodiment of the present invention; Figure 2 It is a technical roadmap for a method for additively manufacturing a strong and tough structure based on a combination of multiple printing parameters of a single material in an embodiment of the present invention.

[0032] like Figure 1 and Figure 2 As shown, this embodiment provides a method for additive manufacturing of a strong and tough structure based on a combination of multiple printing parameters of a single material, comprising the following steps: S10, select a single material suitable for additive manufacturing.

[0033] Specifically, in this embodiment, a single material Onyx (having adjustable brittleness and plasticity properties) suitable for additive manufacturing is selected as the printing material.

[0034] Onyx can exhibit different mechanical properties under different printing parameters, showing both brittleness and plasticity.

[0035] S20, select the mechanical properties of a single material for modeling: tensile strength TS, tensile modulus TM, interfilament bond strength IF-TS, interfilament bond modulus IF-TM, interlaminar shear strength ILSS.

[0036] S30, selecting printing parameters to be optimized in the additive process.

[0037] The combination of printing parameters has an important influence on the final mechanical properties of a single material (Onyx). Specifically, in this embodiment, the printing parameters selected for optimization are: Printing temperature T n (℃), printing speed S p (mm / s), printing layer height LT (mm) and extrusion multiple EM (%).

[0038] S40, establishing a mathematical model between mechanical properties and printing parameters, including the following sub-steps S41-S42: S41, design a test matrix for a single material: (1) 0° stretching of the single material in the X direction to test the tensile modulus TM and tensile strength TS; (2) 90° stretching of the single material in the Y direction to test the inter-filament bond strength IF-TS and inter-filament bond modulus IF-TM; (3) short beam shear test of the single material in the Z direction to test the interlaminar shear strength ILSS.

[0039] S42, the response surface methodology (RSM) was used to establish the relationship between the mechanical properties of single materials (TS, TM, IF-TS, IF-TM, ILSS) and the printing parameters ( T n , S p , LT , EM ) between the two.

[0040] S50, according to the mathematical model established in step S42, determine the combination of printing parameters that produce the strongest comprehensive mechanical property and the weakest comprehensive mechanical property respectively through a multi-objective optimization (MOO) method.

[0041] (1) Combination of printing parameters with the strongest mechanical properties:

[0042] A combination of printing parameters with the strongest comprehensive mechanical properties is used to optimize TS, TM, IF-TS, IF-TM, and ILSS of a single material to adapt to structures that require high strength performance.

[0043] (2) Combination of printing parameters with the weakest mechanical properties:

[0044] The combination of printing parameters that integrate the weakest mechanical properties is used to optimize the plasticity and toughness of the strong phase, resulting in a single material with better energy absorption capacity and impact strength.

[0045] In the formula, x Indicates printing parameters ( T n , S p , LT , EM ), f 1( x ) is used to express the tensile modulus TM and tensile strength TS of a single material in the X-direction 0° tensile property. f 2( x ) is used to represent the comprehensive performance of the inter-filament performance and inter-layer performance of IF-TS, IF-TM and ILSS of a single material.

[0046] 260℃≤ T n ≤290℃,0.1mm≤ LT ≤0.2 mm, 20 mm / s≤ S p ≤60 mm / s, 95 %≤ EM ≤105 %.

[0047] S60, constructing a bionic hierarchical structure, including the following sub-steps: S61, Strong Phase Deposition: Printing is done using a combination of printing parameters that combine the strongest mechanical properties to ensure that the part has high strength and stiffness when subjected to stress.

[0048] Specifically, the printing thickness in this step is 0.4 mm.

[0049] S62, weak phase deposition: Printing is done using a combination of printing parameters that combine the weakest mechanical properties to ensure that this part has good plasticity and toughness and can effectively absorb impact energy.

[0050] Specifically, the printing thickness in this step is 0.4 mm.

[0051] S63, by adjusting the printing parameter combination between different phases and repeating steps S61~S62, the alternating deposition of strong phase and weak phase is achieved in the same additive manufacturing sample, so that the single material can be effectively deformed under the action of stress, thereby avoiding premature rupture of the structure and enhancing the energy absorption capacity, and finally constructing a bionic layered structure with alternating strong / weak phases and soft / hard inter-filament and inter-layer interface properties.

[0052] S70, performance evaluation, includes the following sub-steps S71 to S73: S71, the impact strength value of the bionic layered structure is determined by the Charpy impact test, which represents the energy absorbed by the sample when subjected to an impact load. The test results are shown in Figure 3 As shown: S is a sample prepared by a single printing parameter combination with the strongest comprehensive mechanical properties; W is a sample prepared by a single printing parameter combination with the weakest comprehensive mechanical properties; SW is the method of this embodiment, that is, a sample prepared by alternating deposition of two printing parameter combinations, where 0 and 90 represent different printing directions, namely pure 0° printing and pure 90° printing. From the comparison of the test results, it can be seen that the impact strength of SW in two different printing directions is higher than that of S and W samples in the corresponding printing directions. This shows that the sample prepared in this embodiment has high energy absorption, that is, high toughness.

[0053] S72, the strain distribution and energy absorption behavior of the bionic layered structure during bending were determined by a three-point bending test combined with digital image correlation (DIC) technology. Figure 4 As shown: Figure 4 From the force-displacement curve in (a), it can be seen that the initial slope and peak force of the S-0 specimen are the largest, followed by the SW-0 specimen, and the W-0 specimen is the smallest. Figure 4 As can be seen in (b), when the force decays to 15% of the peak value, the SW-0 sample absorbs the highest energy, followed by the W-0 sample, and the S-0 sample absorbs the lowest energy. This shows that the SW-0 sample maintains the same level of bending modulus and bending strength as the S-0 sample, and the energy absorption capacity has been greatly improved.

[0054] S73, through the SEM image analysis of the bionic layered structure after the Charpy impact test, the internal microstructural damage was observed, the microscopic failure mode (such as matrix failure, debonding between wires and interlayer interfaces, etc.) was observed, and the causal relationship between macroscopic crack initiation and microscopic defects was confirmed; the DIC image analysis of the strain field change in the three-point bending test accurately located the crack initiation position, combined with the corresponding load moment of the load-displacement curve, the mechanical state at the moment of crack initiation and propagation was synchronously captured, and the crack propagation path was tracked. Combining the above characterization techniques, the crack propagation mechanism and energy absorption path were obtained.

[0055] S80, performance verification: obtain and compare the absolute values ​​of strength and energy absorption of samples with three printing strategies from the standardized test in step S70, combine the microscopic failure characterization of SEM images after Charpy impact test and DIC image analysis of strain field distribution and force-displacement curve during three-point bending test to capture the mechanical state at the moment of crack initiation and propagation, and track the crack propagation path, so as to verify the strength and energy absorption characteristics of the bionic layered structure.

[0056] Analysis of the strength / toughness mechanism of bionic layered structures Figure 5 As shown in the figure, the S sample prepared by the process parameter combination with the strongest comprehensive mechanical properties has good inter-filament and inter-layer bonding properties, and low porosity, so that the stress can be evenly transmitted between the filament bundles, and the strain is concentrated at the notch tip, so that the crack expands rapidly and forms a brittle fracture form; the W sample prepared by the process parameter combination with the weakest comprehensive mechanical properties has poor inter-filament and inter-layer bonding properties, and high porosity, which makes it difficult to transmit the stress on the fiber bundle, and the strain distribution is dispersed, so that the inter-filament and inter-layer interface debonds to form a serrated failure morphology, which is a ductile damage form; the SW sample prepared by alternating deposition of the two process parameter combinations with the strongest and weakest comprehensive mechanical properties has the inter-filament and inter-layer bonding properties of the S and W samples alternately. The strong phase can more easily transfer stress to the weak phase while maintaining the bearing capacity, improve the toughness of the strong phase, and increase the shear stress between the weak phase layers, resulting in debonding of the soft interface, crack deflection, reduced stress concentration, delayed fracture process, and improved overall strength and toughness.

[0057] This embodiment also provides an application of a method for manufacturing a strong and tough structure based on a combination of multiple printing parameters of a single material: In this embodiment, a bionic layered structure is prepared by a strong structural additive manufacturing method based on a single-material combination of multiple printing parameters and verified by performance evaluation, which greatly improves the energy absorption capacity and impact strength of the additively manufactured sample and is suitable for aerospace, automotive industry, protective equipment and sports equipment.

[0058] (1) Aerospace: Providing additively manufactured components with excellent strength and toughness for aviation structural parts.

[0059] (2) Automobile industry: manufacturing high energy absorption structural parts to improve automobile collision safety performance.

[0060] (3) Protective equipment: used to make protective equipment and materials with high impact performance.

[0061] (4) Sports equipment: Provide sports equipment components with high strength, toughness and impact resistance.

[0062] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for additive manufacturing of a strong and tough structure based on a combination of multiple printing parameters of a single material, characterized in that: The following steps are involved: S10, selecting a single material suitable for additive manufacturing, wherein the single material has adjustable brittle and plastic properties; S20, selecting a mechanical property of the single material for modeling; S30, selecting printing parameters to be optimized during the additive process; S40, after designing the test matrix of the single material, establishing a mathematical model between the mechanical properties of the single material and the printing parameters by using a response surface method; S50, determining, according to the mathematical model, by a multi-objective optimization method, a combination of the two printing parameters that produce the strongest comprehensive mechanical property and the weakest comprehensive mechanical property; S60, additive manufacturing is performed by alternating between a combination of printing parameters with the strongest comprehensive mechanical properties and a combination of printing parameters with the weakest comprehensive mechanical properties, thereby achieving alternating deposition of strong and weak phases in the same additively manufactured sample, and constructing a bionic layered structure with alternating strong / weak phases having soft / hard inter-filament and inter-layer interface properties.

2. The method for manufacturing a strong and tough structure based on a single material and a combination of multiple printing parameters according to claim 1, characterized in that: in, In step S10, the single material includes Onyx.

3. The method for manufacturing a strong and tough structure based on a single material and a combination of multiple printing parameters according to claim 2, characterized in that: in, In step S20, the mechanical properties include tensile strength TS, tensile modulus TM, inter-filament bonding strength IF-TS, inter-filament bonding modulus IF-TM and inter-laminar shear strength ILSS, In step S30, the printing parameters include printing temperature T n , Printing speed S p , Print layer height LT And the extrusion multiple EM .

4. The method for manufacturing a strong and tough structure based on a combination of multiple printing parameters of a single material according to claim 3, Features: in, In step S40, the test matrix includes: The single material is stretched at 0° in the X direction to test the tensile modulus TM and the tensile strength TS; The single material is stretched at 90° in the Y direction to test the inter-filament bonding strength IF-TS and the inter-filament bonding modulus IF-TM; A Z-direction short beam shear test was performed on the single material to test the interlaminar shear strength ILSS.

5. The method for manufacturing a strong and tough structure based on a combination of multiple printing parameters of a single material according to claim 3, characterized in that: in, In step S50, the combination of the printing parameters with the weakest mechanical properties is: ， The combination of printing parameters with the strongest comprehensive mechanical properties is: ， and 260 °C ≤ T n ≤ 290 °C, 0.1 mm ≤ LT ≤ 0.2 mm, 20 mm / s ≤ S p ≤ 60 mm / s, 95 % ≤ EM ≤ 105%, In the formula, x Indicates different combinations of the printing parameters, f 1( x ) is used to represent the X-direction 0° tensile properties of the tensile modulus TM and tensile strength TS of the single material, f 2( x ) is used to represent the comprehensive performance of the inter-filament performance and inter-layer performance of IF-TS, IF-TM and ILSS of the single material.

6. The method for manufacturing a strong and tough structure based on a single material and a combination of multiple printing parameters according to claim 5, characterized in that: in, The combination of printing parameters with the strongest mechanical properties is used to optimize the TS, TM, IF-TS, IF-TM and ILSS of the single material to adapt to the structure requiring high strength performance. The combination of printing parameters that integrate the weakest mechanical properties is used to optimize the plasticity and toughness of the strong phase, so that the single material has better energy absorption capacity and impact strength.

7. The method for manufacturing a strong and tough structure based on a combination of multiple printing parameters of a single material according to any one of claims 1 to 6, characterized in that: The following steps are also included: S70, determining the energy absorption value of the bionic layered structure by a Charpy impact test, The strain distribution and energy absorption behavior of the bionic layered structure during bending were determined by a three-point bending test combined with DIC technology. The crack propagation mechanism and energy absorption path of the bionic layered structure are obtained by analyzing the internal microstructure damage through SEM images and the change of strain field through DIC images in Charpy impact test and three-point bending test; S80, combining the test results in step S70 to verify the strength and energy absorption characteristics of the bionic layered structure.

8. An application of the method for additive manufacturing of a strong and tough structure based on a single material and a combination of multiple printing parameters as described in any one of claims 1 to 7 in aerospace, automotive industry, protective equipment and sports equipment.

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