CN110843312A - Grid-reinforced intelligent paper folding composite material structure design method - Google Patents
Grid-reinforced intelligent paper folding composite material structure design method Download PDFInfo
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Abstract
A design method of a grid reinforced intelligent paper folding composite material structure belongs to the technical field of composite material structure design. The grid-reinforced intelligent origami composite material structure comprises an origami substrate with folds and a grid-reinforced shape memory rigidization framework, and the method comprises the following steps: and laying a grid reinforced shape memory rigidized framework on the folded paper substrate with the creases, and then bonding and compounding the grid reinforced shape memory rigidized framework and the folded paper substrate by resin glue with a shape memory function. The grid-reinforced intelligent paper folding composite material designed by the invention has the advantages of light structure weight, reliable and controllable folding and unfolding, strong configuration changing capability, capability of ensuring the bearing performance after unfolding, and capability of well meeting the design requirement of a large-scale unfolded structure. The design method of the grid reinforced intelligent paper folding composite material structure provides an effective solution for the innovative design of a large foldable structure, and can be applied to the design of structures which require light weight, reliable folding and unfolding and have high bearing capacity after being unfolded.
Description
Technical Field
The invention belongs to the technical field of composite material structure design, and particularly relates to a grid-reinforced intelligent paper folding composite material structure design method.
Background
The foldable structure is a structure capable of freely changing the geometric configuration of the structure in a large scale, and has wide application in the engineering fields of spaceflight, ships, medical treatment and the like. Taking a large space expandable structure as an example, with the diversified development of deep space exploration activities, the functional requirements on the spacecraft are more and more. The future development direction of the spacecraft structure is large-scale, light, foldable, high in bearing capacity, resistant to space environment and the like. Given the stringent space and payload requirements of vehicles, innovative development of spacecraft has met with unprecedented challenges. How to solve the design problems of light weight, easy folding and unfolding and high bearing capacity after unfolding of the large-scale spacecraft is one of the hot spots in the research field of large-scale space structures/materials at home and abroad.
The space extending arm is used as a basic component of a space expandable structure and is a foundation for constructing a large-scale complex space structure. Its primary function is to support the payload to a specified spatial location. When in application, the movable support is firstly required to be efficiently folded and unfolded after being put into a rail, and certain bearing capacity can be provided. The traditional truss type stretching arm has good unfolding reliability, high structural rigidity and strength, higher structural complexity and large mass; the telescopic extending arm has high unfolding precision and good reliability, but has low folding efficiency; the thin-wall tubular extension arm and the inflatable extension arm are small in mass, high in furling ratio and reliability, small in structural rigidity, limited in bearing capacity and the like. At present, no extension arm has light weight and reliable folding and unfolding, and has higher structural bearing capacity after being unfolded.
The origami structure has become a hot spot of research in the scientific field and the engineering field in recent years due to the advantages of excellent folding and unfolding deformation capability, designability and the like. Current research into origami-based superstructures/metamaterials is active. The Miura-ori paper folding principle has been successfully applied to the fields of rotorcraft, foldable hull structures, artificial vascular stents, cores of impact-resistant sandwich panels, acoustic sensor arrays, variable-configuration sound barriers, and the like. The light and easy folding and unfolding property of the folded paper structure arouses great attention. Can the paper folding design concept be applied to the design of a space-expandable structure? The design of the fold is found to be the core of the design of the folded paper structure. In fact, for researchers of expandable film structures, creases are not strange, and the structures inevitably generate a large amount of local plastic deformation when being efficiently stored, namely creases which are usually disorderly and seriously affect the expansion performance and the final forming precision of the structures, so that the problem always troubles structural designers for many years. Limited by conventional thinking, researchers often consider how to eliminate the effect of creases and do not have a way to design or utilize them. The emergence of the paper folding structure at present arouses the idea that people want to utilize and design creases to innovatively design the expandable structure. In the traditional manual paper folding process, a paper folding structure capable of self-unfolding or self-folding can be seen, which indicates that the self-driven unfolding of the paper folding structure is expected to be realized through reasonable design of the crease. The structure has great significance for the deployable structure, and can save a large amount of energy consumption. The research in the aspect has not been reported in professional journal papers at present. The paper folding structure has light weight and foldable and expandable characteristics, and how to have high bearing capacity after being unfolded is a problem to be considered in structural design.
The shape memory composite material is prepared by compounding a shape memory polymer and a reinforcing material such as carbon fiber. Under certain conditions (e.g., heat) while being subjected to a specified external load, the material is imparted with a predetermined configuration. Under the condition of constant external load, some external conditions (such as temperature reduction) are changed, and the unloaded material can keep the configuration unchanged. Upon reheating, the material may return to the original state. The shape memory composite material has the advantages of large recovery deformation, high specific strength and high specific rigidity.
The grid reinforcing technology is widely applied to the fields of aerospace, ships and oceans and the like, is typically applied to airship, space living cabins, grid cylindrical shells and the like, and is one of important means for reducing weight of large-scale structures and ensuring the bearing capacity of the structures.
Disclosure of Invention
The invention aims to provide a design method of a grid-reinforced intelligent folded paper composite material structure, which solves the problems of light weight, reliability, controllable folding and unfolding of an expandable structure and high bearing capacity after expansion.
In order to achieve the purpose, the invention adopts the following technical scheme:
a design method of a grid-reinforced intelligent origami composite structure comprises an origami base body with folds and a grid-reinforced shape memory rigidized framework, and comprises the following steps: and laying a grid reinforced shape memory rigidized framework on the folded paper substrate with the creases, and then bonding and compounding the grid reinforced shape memory rigidized framework and the folded paper substrate by resin glue with a shape memory function.
Compared with the prior art, the invention has the beneficial effects that: the folded paper substrate can be folded and unfolded, but the unfolding force of the folded paper substrate is insufficient, and meanwhile, the bearing performance of the folded paper substrate after being unfolded is insufficient, so that the further engineering application of the folded paper substrate as a bearing structure is limited. The proposed grid reinforced skeleton has shape memory function, and can realize folding and unfolding control of the skeleton through various stimulation modes such as electricity, light and the like. After the framework is unfolded to a set position, the external field stimulation is removed, and the framework is stiffened, so that the integral bearing performance of the structure is ensured. If the structural configuration needs to be changed, external field stimulation can be applied again to soften the framework, and the deformation control of the whole structure is realized through the folding and unfolding deformation of the shape memory framework. The grid-reinforced intelligent paper folding composite material designed by the invention has the advantages of light structure weight, reliable and controllable folding and unfolding, strong deformation capability, capability of ensuring the bearing performance after unfolding, and capability of well meeting the performance requirements of the unfoldable structure. The design method of the grid reinforced intelligent paper folding composite material structure provides an effective solution for the innovative design of an expandable structure, and can be applied to the design of structures which require light weight, reliable folding and unfolding and high bearing capacity after expansion.
Drawings
FIG. 1 is a schematic view of the structural composition of the grid reinforced smart paper-folded composite of the present invention;
FIG. 2 is a schematic structural diagram of a Miura-Ori type grid-reinforced intelligent composite material designed according to the present invention;
FIG. 3 is a schematic structural diagram of a zigzag grid reinforced smart composite designed in accordance with the present invention;
FIG. 4 is a schematic view of a Miura-Ori type axial grid reinforced smart composite support tube designed in accordance with the present invention;
FIG. 5 is a schematic structural diagram of a Miura-Ori type collar bidirectional grid reinforced intelligent composite material designed according to the present invention;
fig. 6 is a schematic diagram of a krescing-type grid-reinforced smart composite support tube designed according to the present invention.
The thick lines in fig. 2-6 represent the mesh-reinforced shape memory rigidized skeleton.
Detailed Description
As shown in fig. 1 to fig. 6, the present embodiment discloses a method for designing a grid-reinforced intelligent origami composite structure, wherein the grid-reinforced intelligent origami composite structure comprises an origami base body 1 with folds and a grid-reinforced shape memory-stiffened framework 2, and the method comprises the following steps: a grid reinforced shape memory rigidized framework 2 is laid on a folded paper substrate 1 with folds, and then the grid reinforced shape memory rigidized framework and the folded paper substrate are bonded and compounded together through resin glue with a shape memory function.
When compounding, the grid reinforced shape memory rigidized framework 2 needs to be placed under specific external conditions (such as heat, electricity, light, magnetic field or solution (common cellulose, sodium dodecyl sulfate and the like) and other external stimulation) for a period of time. Different stimulation modes or the same type of stimulation mode but with different formulations, the time required is also different. Depending on the shape memory material system selected for the grid-reinforced shape memory rigidized skeleton 2, is known in the art. For example, for the framework made of the thermally driven shape memory polymer, the glass transition temperature of the material is generally between 60 and 100 ℃, so that the grid reinforced shape memory rigid framework 2 needs to be heated to be higher than the glass transition temperature and placed for two hours during compounding. These particular external conditions are prior art.
During compounding, the folded paper substrate 1 with the creases and the grid reinforced shape memory rigidized framework 2 are unfolded to the configuration state required during normal work.
The folded paper substrate 1 with the creases is made of a Mylar film, an F4.6 film, a polyimide film, an aluminized polyimide film, a flexible fabric film, a composite material film or a shape memory film.
The grid reinforced shape memory rigidized framework 2 is made of shape memory alloy, shape memory polymer or shape memory composite material.
When the prepared grid reinforced intelligent paper folding composite material structure is applied, firstly, stimulation is carried out by utilizing specific external conditions, so that the structure is softened; then, efficiently folding and gathering the structure of the paper folding composite material according to a folding and unfolding mechanism provided by the designed crease lines; after the working environment is reached, stimulating by using specific external conditions again, and automatically unfolding the structure along the crease design; finally, the structure can be brought into an operative state until it is deployed to an initially memorized configuration.
The design principle is as follows: the design of the grid reinforced shape memory rigidized framework 2 is determined according to the structural form of the paper folding base body 1. The efficient folding of the structure is realized by reasonably designing the folding lines, and the folding and unfolding design of the shape memory rigidized framework 2 is also included; the structure is efficiently, reliably and controllably unfolded in a mode of crease driving and grid reinforced shape memory rigidization framework 2 driving; the integral bearing of the structure is ensured in a mode of joint bearing of the crease and the grid reinforced shape memory rigidized framework 2; by using the design concept of the grid reinforcing structure for reference, the whole structure is lighter while the structure is ensured to bear. The novel composite material structure design method provides an effective way for the innovative design of large-scale deployable structures.
Claims (4)
1. A method for designing a grid-reinforced intelligent paper folding composite material structure is characterized by comprising the following steps: the grid-reinforced intelligent origami composite material structure comprises an origami base body (1) with folds and a grid-reinforced shape memory rigidization framework (2), and the method comprises the following steps: a grid reinforced shape memory rigidized framework (2) is laid on a folded paper substrate (1) with folds, and then the grid reinforced shape memory rigidized framework and the folded paper substrate are bonded and compounded together through resin glue with a shape memory function.
2. The design method of the grid-reinforced intelligent origami composite structure according to claim 1, characterized in that: the folded paper substrate (1) with the creases is made of a Mylar film, an F4.6 film, a polyimide film, an aluminized polyimide film, a flexible fabric film, a composite material film or a shape memory film.
3. The design method of the grid-reinforced intelligent origami composite structure according to claim 1, characterized in that: the grid reinforced shape memory rigidized framework (2) is made of shape memory alloy, shape memory polymer or shape memory composite material.
4. The design method of the grid-reinforced intelligent origami composite structure according to claim 1, characterized in that: when compounding, firstly, the folded paper substrate (1) with the creases and the grid reinforced shape memory rigidized framework (2) are unfolded to the configuration state required by normal work, and then the grid reinforced shape memory rigidized framework (2) is placed on the folded paper substrate (1) with the creases to bond the two.
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Cited By (10)
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|---|---|---|---|---|
| CN113482161A (en) * | 2021-05-31 | 2021-10-08 | 东南大学 | Foldable structure based on rectangular six-fold-mark paper folding unit |
| CN113561490A (en) * | 2021-07-01 | 2021-10-29 | 浙江大学 | Intelligent construction method for 4D printing folding space structure |
| CN113669414A (en) * | 2021-07-29 | 2021-11-19 | 浙江大学 | Torsional vibration absorber unit based on bistable folded paper and vibration absorber |
| CN113709967A (en) * | 2021-09-07 | 2021-11-26 | 东莞市哲华电子有限公司 | High-thermal-conductivity composite copper foil capable of stretching under heating and preparation method thereof |
| CN113714075A (en) * | 2021-08-13 | 2021-11-30 | 浙江大学 | Longitudinal wave torsional wave transducer inspired by Kresling configuration and design method thereof |
| CN114030651A (en) * | 2021-11-26 | 2022-02-11 | 哈尔滨工业大学 | Inflatable expansion type semi-rigid sealed cabin adopting Kresling folding mode |
| CN114725648A (en) * | 2022-05-22 | 2022-07-08 | 河北工程大学 | Foldable-unfolded bidirectional-deformation flexible antenna and preparation method thereof |
| CN115260783A (en) * | 2022-08-10 | 2022-11-01 | 东南大学 | Liquid crystal elastomer actuator and application |
| CN117622519A (en) * | 2024-01-26 | 2024-03-01 | 西北工业大学深圳研究院 | Space variable structure paper folding system based on shape memory material |
| CN114725648B (en) * | 2022-05-22 | 2024-05-03 | 河北工程大学 | Flexible antenna capable of being folded and unfolded to deform bidirectionally and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113482161A (en) * | 2021-05-31 | 2021-10-08 | 东南大学 | Foldable structure based on rectangular six-fold-mark paper folding unit |
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| CN113709967A (en) * | 2021-09-07 | 2021-11-26 | 东莞市哲华电子有限公司 | High-thermal-conductivity composite copper foil capable of stretching under heating and preparation method thereof |
| CN113709967B (en) * | 2021-09-07 | 2022-09-06 | 东莞市哲华电子有限公司 | High-thermal-conductivity composite copper foil capable of stretching under heating and preparation method thereof |
| CN114030651A (en) * | 2021-11-26 | 2022-02-11 | 哈尔滨工业大学 | Inflatable expansion type semi-rigid sealed cabin adopting Kresling folding mode |
| CN114725648A (en) * | 2022-05-22 | 2022-07-08 | 河北工程大学 | Foldable-unfolded bidirectional-deformation flexible antenna and preparation method thereof |
| CN114725648B (en) * | 2022-05-22 | 2024-05-03 | 河北工程大学 | Flexible antenna capable of being folded and unfolded to deform bidirectionally and preparation method thereof |
| CN115260783A (en) * | 2022-08-10 | 2022-11-01 | 东南大学 | Liquid crystal elastomer actuator and application |
| CN117622519A (en) * | 2024-01-26 | 2024-03-01 | 西北工业大学深圳研究院 | Space variable structure paper folding system based on shape memory material |
| CN117622519B (en) * | 2024-01-26 | 2024-04-02 | 西北工业大学深圳研究院 | Space variable structure paper folding system based on shape memory material |
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