CN114248519A - Laminate structure stealth material based on 3D printing and preparation method thereof - Google Patents
Laminate structure stealth material based on 3D printing and preparation method thereof Download PDFInfo
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- CN114248519A CN114248519A CN202111597691.4A CN202111597691A CN114248519A CN 114248519 A CN114248519 A CN 114248519A CN 202111597691 A CN202111597691 A CN 202111597691A CN 114248519 A CN114248519 A CN 114248519A
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- 238000010146 3D printing Methods 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
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- 239000002250 absorbent Substances 0.000 claims description 19
- 239000002131 composite material Substances 0.000 claims description 10
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- 238000007639 printing Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 239000004793 Polystyrene Substances 0.000 claims description 4
- 229920002223 polystyrene Polymers 0.000 claims description 4
- 230000008021 deposition Effects 0.000 claims description 3
- 230000002068 genetic effect Effects 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 239000004677 Nylon Substances 0.000 claims description 2
- 239000002041 carbon nanotube Substances 0.000 claims description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 2
- 238000013329 compounding Methods 0.000 claims description 2
- 229910001337 iron nitride Inorganic materials 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- 239000004417 polycarbonate Substances 0.000 claims description 2
- 229920000515 polycarbonate Polymers 0.000 claims description 2
- 239000004800 polyvinyl chloride Substances 0.000 claims description 2
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 2
- 239000006096 absorbing agent Substances 0.000 claims 1
- 239000011152 fibreglass Substances 0.000 abstract description 4
- 239000006260 foam Substances 0.000 abstract description 4
- 238000007731 hot pressing Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 54
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- 239000012188 paraffin wax Substances 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/118—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using filamentary material being melted, e.g. fused deposition modelling [FDM]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
- B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/025—Electric or magnetic properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/212—Electromagnetic interference shielding
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Abstract
The invention relates to a laminate structure stealth material based on 3D printing and a preparation method thereof. Compared with the traditional laminate structure stealth material which is designed and processed by hot pressing based on wave absorbing layers such as thin-layer foam, glass fiber reinforced plastic and the like, the thickness and the total thickness of each wave absorbing layer of the laminate structure stealth material provided by the invention are easier to accurately control, and excellent wave absorbing performance can be obtained while the mechanical performance is ensured.
Description
Technical Field
The invention belongs to the technical field of electromagnetic protection materials, and particularly relates to a laminate structure stealth material based on 3D printing and a preparation method thereof.
Background
With the development of modern science and technology, the importance of radar stealth technology is increasing day by day, and the application of the technology relates to the fields of ships, aviation, aerospace, ground equipment and the like. The radar stealth technology is a technology for reducing a radar scattering cross section (RCS) of a target by attenuating, suppressing, absorbing and deflecting radar waves of the target, so that the radar is difficult to identify/track by a radar within a certain range. One of the technical approaches is to apply a material capable of absorbing/attenuating radar waves on a radar detection target, namely, a radar stealth material is utilized so as to achieve the purpose of reducing RCS of the target. The laminate structure stealth material has the characteristics that different thin-layer materials can be sequentially overlapped and compounded into a whole according to the impedance matching design, has the advantages of good structure bearing and wave absorbing performance, and provides more design dimensions for broadband wave absorbing design. At present, a laminate structure stealth material is generally formed by layering, stacking, heating and hot pressing wave-absorbing layers such as thin-layer foam and glass fiber reinforced plastics according to a certain thickness and stacking sequence, and the problem that the thickness of each layer and the total forming thickness are difficult to control exists, so that the difference between the electrical property of the material and the design index is large, and the application requirement cannot be met. Meanwhile, the laminated plate structure stealth material is affected by factors such as uneven heat conduction, poor interlayer adhesion and the like in the heating and hot pressing process, so that the layering defects of all layers of the material are easily caused, and the overall structure mechanics and the electrical performance indexes of the material are further affected. Therefore, the laminated plate structure stealth material based on hot press molding still has the problems of difficulty in accurate control of structural mechanics and electrical performance, long production period, high cost and the like, and the application of the laminated plate structure stealth material is restricted.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a laminate structure stealth material based on 3D printing and a preparation method thereof aiming at the defects in the prior art, each wave-absorbing layer is accurately printed according to the design thickness by applying the 3D printing technology, and the laminate structure stealth material has the characteristics of high forming speed, strong interlayer bonding force, good mechanical and electrical property controllability and the like.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the laminate structure stealth material is formed by compounding multiple layers of thermoplastic polymer base wave-absorbing layers, each layer of thermoplastic polymer base wave-absorbing layer is obtained by printing the layers of a 3D printer, and electromagnetic parameters and thickness of each layer of thermoplastic polymer base wave-absorbing layer can be designed according to the requirements of the stealth performance of the laminate structure stealth material.
According to the scheme, the thermoplastic polymer-based wave absorbing layer is a composite material obtained by uniformly mixing a thermoplastic polymer and a radar wave absorbent, wherein the content of the radar wave absorbent is 10-75 wt%.
According to the scheme, the thermoplastic polymer is one of polystyrene, polyvinyl chloride, nylon and polycarbonate.
According to the scheme, the radar wave absorbent is one of iron nitride, carbonyl iron powder and carbon nano tubes.
The invention also discloses a 3D printing preparation method of the laminate structure stealth material, which comprises the following specific steps:
1) extracting electromagnetic parameters of the composite material obtained by mixing the radar wave absorbent with different contents by using a coaxial method to obtain corresponding electromagnetic data;
2) according to the appearance, the size and the stealth performance requirements of the laminate structure stealth material, a three-dimensional model of the laminate structure stealth material to be printed is established by a computer, the total thickness and the number of layers of the laminate structure are preset, the electromagnetic data obtained in the step 1) are imported, and the radar wave absorbent content of each thermoplastic polymer-based wave absorbing layer and the thickness of each thermoplastic polymer-based wave absorbing layer in the laminate structure stealth material are calculated by a genetic algorithm according to an impedance matching principle;
3) saving the three-dimensional model as STL data, slicing the three-dimensional model in the step 2) through slicing software to enable each layer of thermoplastic polymer-based wave absorbing layer to be divided into multiple slicing layers, wherein the thickness of each slicing layer is 0.1-0.5 mm, obtaining SLC data, and inputting the SLC data into 3D printing equipment;
4) and (3) according to the calculated radar wave absorbent content of each thermoplastic polymer-based wave absorbing layer, mixing and extruding the raw materials of the thermoplastic polymer and the radar wave absorbent by using a double-screw extruder according to a corresponding proportion to obtain different 3D printing wires, loading the obtained different 3D printing wires into 3D printing equipment as raw materials, and printing the sliced layers in the step 3) layer by using a fused deposition 3D printing and forming process until printing of all the sliced layers is completed to obtain the laminate structure stealth material.
According to the scheme, the number of the thermoplastic polymer-based wave-absorbing layers in the laminate structure stealth material in the step 1) is 2-5.
The invention adopts a 3D printing method to realize the integrated design and the integral molding of the broadband stealth and the structure bearing, reduces the steps of the superposition of the wave absorbing layer and the hot press molding, and greatly improves the molding speed. Compared with the traditional laminate structure stealth material designed and processed based on wave-absorbing layers such as thin-layer foam, glass fiber reinforced plastic and the like, the thickness/total thickness of each wave-absorbing layer is easier to accurately control, and meanwhile, the controllability of mechanical property and wave-absorbing property is stronger.
The invention has the beneficial effects that: 1. compared with the traditional laminate structure stealth material which is designed and processed by hot pressing based on wave absorbing layers such as thin-layer foam, glass fiber reinforced plastic and the like, the thickness and the total thickness of each wave absorbing layer of the laminate structure stealth material provided by the invention are easier to accurately control, and excellent wave absorbing performance can be obtained while the mechanical performance is ensured. 2. The invention adopts a 3D printing method, can realize the integral molding of the broadband stealth and the structure bearing, reduces the steps of wave-absorbing layer superposition and hot-press molding, greatly improves the molding speed, and can realize the high-precision molding of the stealth material with the large-size complex curved-surface layer structure according to the appearance and size requirements of the stealth material.
Drawings
Fig. 1 is a schematic structural diagram of a 3D printing laminate structure stealth material in embodiment 1 of the present invention.
Wherein: 1-wave absorbing layer 1; 2-wave absorbing layer 2; 3-wave absorbing layer 3; 4-wave-absorbing layer 4.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention is further described in detail below with reference to the accompanying drawings.
Example 1
The structural schematic diagram of the 3D printing laminate structure stealth material of the embodiment is shown in fig. 1, and the 3D printing laminate structure stealth material is prepared by a wave-absorbing layer 1, a wave-absorbing layer 2, a wave-absorbing layer 3 and a wave-absorbing layer 4 with different electromagnetic parameters in the following manner:
firstly, extracting electromagnetic parameters of a composite material containing radar wave absorbent with different contents by selecting paraffin, selecting carbonyl iron powder as the radar wave absorbent, and mixing the paraffin and the carbonyl iron powder of the radar wave absorbent according to a mass ratio of 100: 10. 100, and (2) a step of: 15. 100, and (2) a step of: 18. 100, and (2) a step of: 22 to obtain 4 composite materials, marking as 1-4 composite materials, and testing the electromagnetic parameters of the obtained 4 composite materials);
secondly, according to the requirements of the shape and the size of a flat plate of the target laminate structure stealth material (300mm multiplied by 20mm), and the broadband radar wave absorption effect that the reflectivity of 8GHz-18GHz is lower than-10 dB is achieved, a computer modeling software is used for establishing a real three-dimensional model of the laminate structure stealth material to be printed according to the material size of 300mm multiplied by 20mm, the total thickness of the laminate structure is preset to be 20mm, the number of layers is 4, the obtained electromagnetic parameters are imported, the corresponding thickness and the radar wave absorbent content of each layer of the wave absorption layer are designed by using a genetic algorithm based on an impedance matching principle, the radar wave absorbent content of the composite material selected for the obtained wave absorption layers 1-4 is calculated and respectively corresponds to the prepared composite material 1-4, and the corresponding thickness of each layer is respectively 2mm, 6mm, 8mm and 4 mm;
thirdly, taking polystyrene as a thermoplastic polymer raw material, and mixing the polystyrene granules and the radar wave absorbent carbonyl iron powder according to the weight ratio of 100: 10. 100, and (2) a step of: 15. 100, and (2) a step of: 18 and 100: 22, blowing and drying for 4 hours at the temperature of 80 ℃, removing water, and then extruding 1-4 wave-absorbing functional wires required by 3D printing of the wave-absorbing layers 1-4 by using a double-screw extruder;
then, storing the three-dimensional model as STL data, cutting the three-dimensional model layer by layer through slicing software, so that each layer of thermoplastic polymer-based wave-absorbing layer is divided into a plurality of slicing layers, the thickness of each slicing layer is 0.1mm, forming code language storage, and meanwhile, inputting the code language into a 3D printer;
and finally, sequentially forming the wave absorbing layers 4, 3, 2 and 1 by using a 3D printer to the prepared wave absorbing functional wires 1-4 in a 3D fused deposition mode, thus obtaining the laminate structure stealth material integrating broadband stealth and structure bearing.
Tests prove that the reflectivity of the laminate structure stealth material obtained by 3D printing in the embodiment is lower than-12 dB in the range of 8GHz-18GHz, and the compressive strength is higher than 10 MPa.
Claims (6)
1. The laminate structure stealth material based on 3D printing is characterized in that the laminate structure stealth material is formed by compounding multiple layers of thermoplastic polymer base wave-absorbing layers, each layer of thermoplastic polymer base wave-absorbing layer is obtained by printing the layers of a 3D printer, and electromagnetic parameters and thickness of each layer of thermoplastic polymer base wave-absorbing layer can be designed according to the requirement of the stealth performance of the laminate structure stealth material.
2. The laminate structure stealth material based on 3D printing according to claim 1, wherein the thermoplastic polymer-based wave-absorbing layer is a composite material obtained by uniformly mixing a thermoplastic polymer and a radar wave absorbent, wherein the content of the radar wave absorbent is 10-75 wt%.
3. The laminate structure stealth material based on 3D printing according to claim 2, wherein the thermoplastic polymer is one of polystyrene, polyvinyl chloride, nylon, polycarbonate.
4. The laminate structure stealth material based on 3D printing according to claim 2, wherein the radar wave absorber is one of iron nitride, carbonyl iron powder, carbon nanotubes.
5. A3D printing preparation method of the laminate structure stealth material disclosed by any one of claims 1 to 4 is characterized by comprising the following specific steps:
1) extracting electromagnetic parameters of the composite material obtained by mixing the radar wave absorbent with different contents by using a coaxial method to obtain corresponding electromagnetic data;
2) according to the appearance, the size and the stealth performance requirements of the laminate structure stealth material, a three-dimensional model of the laminate structure stealth material to be printed is established by a computer, the total thickness and the number of layers of the laminate structure are preset, the electromagnetic data obtained in the step 1) are imported, and the radar wave absorbent content of each thermoplastic polymer-based wave absorbing layer and the thickness of each thermoplastic polymer-based wave absorbing layer in the laminate structure stealth material are calculated by a genetic algorithm according to an impedance matching principle;
3) saving the three-dimensional model as STL data, slicing the three-dimensional model in the step 2) through slicing software to enable each layer of thermoplastic polymer-based wave absorbing layer to be divided into multiple slicing layers, wherein the thickness of each slicing layer is 0.1-0.5 mm, obtaining SLC data, and inputting the SLC data into 3D printing equipment;
4) and (3) according to the calculated radar wave absorbent content of each thermoplastic polymer-based wave absorbing layer, mixing and extruding the raw materials of the thermoplastic polymer and the radar wave absorbent by using a double-screw extruder according to a corresponding proportion to obtain different 3D printing wires, loading the obtained different 3D printing wires into 3D printing equipment as raw materials, and printing the sliced layers in the step 3) layer by using a fused deposition 3D printing and forming process until printing of all the sliced layers is completed to obtain the laminate structure stealth material.
6. The 3D printing preparation method of the laminate structure stealth material according to claim 5, characterized in that the number of layers of the thermoplastic polymer-based wave-absorbing layer in the laminate structure stealth material in the step 1) is 2-5.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104193345A (en) * | 2014-08-20 | 2014-12-10 | 中南大学 | Method for preparing wave-absorbing ceramic component on basis of 3D printing technique |
| CN106751605A (en) * | 2016-11-29 | 2017-05-31 | 南京航空航天大学 | A kind of method that ferrite/thermoplastic polymer composite board is prepared by 3D printing technique |
| CN106980737A (en) * | 2017-04-12 | 2017-07-25 | 西安交通大学 | A kind of manufacture method of continuous fiber reinforced composite materials light structures |
| CN108908930A (en) * | 2018-07-04 | 2018-11-30 | 航天恒星科技有限公司 | Stealthy wave-absorber 3D printing molding equipment and method under the conditions of simulated microgravity |
| US20190197205A1 (en) * | 2017-12-24 | 2019-06-27 | Dassault Systemes | 3d finite element mesh of a 3d part that comprises a lattice structure |
-
2021
- 2021-12-24 CN CN202111597691.4A patent/CN114248519A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104193345A (en) * | 2014-08-20 | 2014-12-10 | 中南大学 | Method for preparing wave-absorbing ceramic component on basis of 3D printing technique |
| CN106751605A (en) * | 2016-11-29 | 2017-05-31 | 南京航空航天大学 | A kind of method that ferrite/thermoplastic polymer composite board is prepared by 3D printing technique |
| CN106980737A (en) * | 2017-04-12 | 2017-07-25 | 西安交通大学 | A kind of manufacture method of continuous fiber reinforced composite materials light structures |
| US20190197205A1 (en) * | 2017-12-24 | 2019-06-27 | Dassault Systemes | 3d finite element mesh of a 3d part that comprises a lattice structure |
| CN108908930A (en) * | 2018-07-04 | 2018-11-30 | 航天恒星科技有限公司 | Stealthy wave-absorber 3D printing molding equipment and method under the conditions of simulated microgravity |
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