CN111017270A - Non-positive poisson ratio buffering energy-absorbing structure filled with round pipe - Google Patents
Non-positive poisson ratio buffering energy-absorbing structure filled with round pipe Download PDFInfo
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- CN111017270A CN111017270A CN201911329303.7A CN201911329303A CN111017270A CN 111017270 A CN111017270 A CN 111017270A CN 201911329303 A CN201911329303 A CN 201911329303A CN 111017270 A CN111017270 A CN 111017270A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
- B64G1/62—Systems for re-entry into the earth's atmosphere; Retarding or landing devices
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Abstract
The invention relates to a non-positive Poisson's ratio buffering energy-absorbing structure filled with a circular tube, which comprises a circular tube cell element and a substrate, wherein the substrate comprises an upper substrate, a lower substrate and a lateral arc substrate, the upper substrate, the lower substrate and the lateral arc substrate are connected end to form a closed structure with a negative Poisson's ratio characteristic, and the shape of the lateral arc substrate is determined in an iteration mode; the circular tube cell is disposed in the substrate according to
Determining n1The number of (2); horizontally arranging circular tube cells in the central area of the substrate, and gradually arranging the circular tube cells layer by layer in an equal-difference number array mode above and below the layer, wherein the tolerance is 1 until the circular tube cells are attached to the upper substrate and the lower substrate; the contact areas of the round tube cell elements are fixedly connected with each other; all the circular tube cells are not in contact with the lateral arc substrate. The structure of the invention has zero Poisson ratio or negative Poisson ratio effect, and the single structure can obtain the level crushing force without assembling, thereby being convenient for reducing the impact overload.
Description
Technical Field
The invention belongs to the technical field of spacecraft landing buffering, and relates to a circular tube filled non-positive Poisson's ratio buffering energy-absorbing structure.
Background
The buffer device is necessary during the landing process of the spacecraft, and the spacecraft system needs to use the buffer device to reduce the impact of the landing process on the personnel and the load in the spacecraft. Structural plasticity energy absorption is a commonly used energy absorption form of a buffer device, for example, the traditional buffer device mostly adopts aluminum honeycomb (the crushing of the aluminum honeycomb can generate plastic deformation) for buffering and energy consumption. The energy absorption structure is generally placed in the cylindrical barrel, and in the energy absorption process, the internal structural part slides along the barrel wall, so that the energy absorption structure cannot be contacted with the barrel wall during and after crushing.
This requires that the energy absorbing structure must have non-positive poisson's ratio characteristics. The poisson's ratio property is the ratio of the transverse strain to the longitudinal strain of the structure. The non-positive poisson ratio is:
although the aluminum honeycomb has high compression energy absorption efficiency, the aluminum honeycomb shows a positive Poisson ratio effect slightly after being crushed, and the aluminum honeycomb is easily contacted with the cylinder wall in the crushing process to scratch the cylinder wall.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, the non-positive Poisson ratio buffering energy absorption structure filled with the round pipe is provided, the single structure is not assembled, the level crushing force can be obtained, the impact overload is convenient to reduce, and the zero Poisson ratio or negative Poisson ratio effect is achieved.
The technical scheme of the invention is as follows:
a non-positive Poisson's ratio buffering energy-absorbing structure filled with round tubes comprises round tube cells and a substrate,
the substrate comprises an upper substrate, a lower substrate and a lateral arc substrate, wherein the upper substrate, the lower substrate and the lateral arc substrate are connected end to form a closed structure with a negative Poisson ratio characteristic, and the shape of the lateral arc substrate is determined in an iterative mode;
the circular tube cell is disposed in the substrate according to
Determining n1Of n, wherein n1The number of circular tube cells, L, is horizontally arranged for the central area of the substrate1Minimum spacing of the lateral arc substrates; d is the diameter of the circular tube cell element;
horizontally arranging circular tube cells in the central area of the substrate, and gradually arranging the circular tube cells layer by layer in an equal-difference number array mode above and below the layer, wherein the tolerance is 1 until the circular tube cells are attached to the upper substrate and the lower substrate; the contact areas of the round tube cell elements are fixedly connected with each other; all the circular tube cells are not in contact with the lateral arc substrate.
Preferably, the thickness of the lateral arc substrate is consistent with that of the upper substrate and the lower substrate.
Preferably, the thickness of the lateral arc substrate is 0.1-0.3 mm.
Preferably, the arc angle of the lateral arc substrate is 20-40 degrees.
Preferably, the crushing plateau force of the substrate is 3000-.
Preferably, the round tube cell is made of aluminum alloy or titanium alloy, and the thickness of the round tube cell is 0.03-0.05 mm.
Preferably, the force acts on the upper substrate, in the crushing process, the load is gradually transmitted from the upper substrate to the round pipe wrapping and is sequentially transmitted downwards, the round pipe in the central area is firstly crushed, then the round pipe is sequentially crushed and fed up and down, the lateral substrate is not contacted with the round pipe cell elements in the crushing and feeding process, and in the crushing process, the round pipe cell elements with different numbers are gradually crushed, so that a plurality of step platform forces are generated, and different buffer overloads are obtained.
Compared with the prior art, the invention has the beneficial effects that:
(1) the structure of the invention has zero Poisson ratio or negative Poisson ratio effect, and the single structure can obtain the level crushing force without assembling, thereby being convenient for reducing impact overload;
(2) in the crushing process, the invention gradually crushes the circular tube cells with different numbers, thereby generating a plurality of step platform forces and further facilitating the obtainment of different buffer overloads.
Drawings
FIG. 1 is a schematic diagram of the configuration and arrangement of a circular tube cell according to the present invention;
FIG. 2 is a schematic view of the load application of the substrate of the present invention;
FIG. 3 is a schematic view of the configuration of the substrate of the present invention;
fig. 4 is a crush curve for a non-positive poisson's ratio structure of the present invention.
Detailed Description
The invention is further illustrated by the following examples.
A non-positive Poisson's ratio buffering energy-absorbing structure filled with round tubes is shown in figure 1 and comprises round tube cells and substrates, wherein the substrates comprise an upper substrate, a lower substrate and a lateral arc substrate, as shown in figure 3, the upper substrate, the lower substrate and the lateral arc substrate are connected end to form a closed structure with a negative Poisson's ratio characteristic, and the shape of the lateral arc substrate is determined in an iteration mode; the thickness of the lateral arc substrate is consistent with that of the upper substrate and the lower substrate, the thickness of the lateral arc substrate is 0.1-0.3mm, the arc angle of the lateral arc substrate is 20-40 degrees, and the crushing platform force of the substrate is 3000-5000N.
The circular tube cell is placed in a substrate, as shown in figure 1,
according to
True n1Of n, wherein n1The number of circular tube cells, L, is horizontally arranged for the central area of the substrate1Minimum spacing of the lateral arc substrates; d is the straight of the circular tube cell elementDiameter;
horizontally arranging the upper and lower parts of the circular tube cell element in the central area of the substrate, and gradually increasing layer by layer according to an arithmetic progression mode, wherein the tolerance is 1 until the circular tube cell element is attached to the upper substrate and the lower substrate; the contact areas of the round tube cell elements are fixedly connected with each other; all the circular tube cells are not in contact with the lateral arc substrate.
The round tube cell is made of aluminum alloy or titanium alloy, and the thickness of the round tube cell is 0.03-0.05 mm.
In the design, the basic dimensions of the substrate are first determined: the length, width and height (L, H, W) are designed according to the buffer space provided by the buffer device. After the basic dimensions were determined, an X direction was set perpendicular to the L, W plane, a Z direction was set perpendicular to the L, H plane, and a Y direction was set perpendicular to the H, W plane.
The analysis was performed using Ls-dyna explicit finite element software. And (3) utilizing a shell unit of a Belytschko-Tsay algorithm, wherein the material adopts an elastic plastic material constitutive structure. The whole model defines single-sided automatic contact, and the dynamic friction coefficient is set to 0.1. The grid division is carried out, the unit dimension of the grid is 1 percent of the whole dimension, for example, the base plate with the dimension of 100mm has the basic unit dimension of 1 mm.
Along the lines shown in fig. 2, the load boundary application is completed, and after calculation, the lateral and longitudinal displacements are extracted and can be obtained from the analysis results.
The ratio of the displacement of the substrate in the X direction to the displacement of the substrate in the Y direction has a negative Poisson ratio effect; no displacement change is caused in the Z direction, and the zero Poisson ratio effect is realized. By extracting the constraint counter force of the rigid wall, the substrate is known to have a plateau force.
The working principle is as follows: the force acts on the upper substrate, as shown in fig. 2, in the crushing process, the load is gradually transmitted from the upper substrate to the round pipe encirclement and is sequentially transmitted downwards, the round pipe in the central area is firstly crushed, then the round pipe is sequentially crushed and fed upwards and downwards, and the lateral substrate is almost not contacted with the round pipe cell element in the crushing and feeding process, so the macroscopic poisson ratio effect is completely ensured by the substrate. The load is transmitted to the internally filled circular tube from the upper substrate and is uniformly transmitted downwards. And the arrangement of the round tubes in the X direction has an hourglass shape, and different round tube cells with different numbers are gradually crushed in the crushing process, so that a plurality of step platform forces appear, as shown in figure 4, and different buffer overloads are convenient to obtain.
The structure of the invention has zero Poisson ratio or negative Poisson ratio effect, and the single structure can obtain the level crushing force without assembling, thereby being convenient for reducing the impact overload.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (7)
1. A non-positive Poisson's ratio buffering energy-absorbing structure filled with round tubes is characterized by comprising round tube cells and a substrate,
the substrate comprises an upper substrate, a lower substrate and a lateral arc substrate, wherein the upper substrate, the lower substrate and the lateral arc substrate are connected end to form a closed structure with a negative Poisson ratio characteristic, and the shape of the lateral arc substrate is determined in an iterative mode;
the circular tube cell is disposed in the substrate according to
Determining n1Of n, wherein n1The number of circular tube cells, L, is horizontally arranged for the central area of the substrate1Minimum spacing of the lateral arc substrates; d is the diameter of the circular tube cell element;
horizontally arranging circular tube cells in the central area of the substrate, and gradually arranging the circular tube cells layer by layer in an equal-difference number array mode above and below the layer, wherein the tolerance is 1 until the circular tube cells are attached to the upper substrate and the lower substrate; the contact areas of the round tube cell elements are fixedly connected with each other; all the circular tube cells are not in contact with the lateral arc substrate.
2. The round tube filled non-positive poisson's ratio buffering energy-absorbing structure of claim 1, wherein: the thickness of the lateral arc substrate is consistent with that of the upper substrate and the lower substrate.
3. The round tube filled non-positive poisson's ratio buffering energy-absorbing structure of claim 2, wherein: the thickness of the lateral arc substrate is 0.1-0.3 mm.
4. The round tube filled non-positive poisson's ratio buffering energy-absorbing structure of claim 1, wherein: the arc angle of the lateral arc substrate is 20-40 degrees.
5. The round tube filled non-positive poisson's ratio buffering energy-absorbing structure of claim 1, wherein: the crushing platform force of the substrate is 3000-5000N.
6. The round tube filled non-positive poisson's ratio buffering energy-absorbing structure of claim 1, wherein: the round tube cell is made of aluminum alloy or titanium alloy, and the thickness of the round tube cell is 0.03-0.05 mm.
7. The round tube filled non-positive poisson's ratio buffering energy-absorbing structure of claim 1, wherein: the force acts on the upper substrate, in the crushing process, the load is gradually transmitted from the upper substrate to the round pipe wrapping and is sequentially transmitted downwards, the round pipe in the central area is firstly crushed, then the round pipe is sequentially crushed and fed up and down, the lateral substrate is not contacted with the round pipe cell elements in the crushing and feeding process, and in the crushing process, the round pipe cell elements with different crushing quantities are gradually crushed, so that a plurality of step platform forces are generated, and different buffer overloads are obtained.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117669094A (en) * | 2023-12-14 | 2024-03-08 | 西南交通大学 | Three-dimensional superstructural coupling filling impact-resistant circular tube structure design method |
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| US9995359B2 (en) * | 2015-08-27 | 2018-06-12 | Airbus Operations S.L. | Deformable structure for absorption of energy from mechanical and/or acoustic impacts |
| US20170233253A1 (en) * | 2016-02-16 | 2017-08-17 | Korea Institute Of Science And Technology | Carbon nanotube structure and preparation method thereof |
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| CN117669094A (en) * | 2023-12-14 | 2024-03-08 | 西南交通大学 | Three-dimensional superstructural coupling filling impact-resistant circular tube structure design method |
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