CN214271672U - Pier anti-collision facility with negative Poisson ratio effect - Google Patents
Pier anti-collision facility with negative Poisson ratio effect Download PDFInfo
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- CN214271672U CN214271672U CN202023241484.9U CN202023241484U CN214271672U CN 214271672 U CN214271672 U CN 214271672U CN 202023241484 U CN202023241484 U CN 202023241484U CN 214271672 U CN214271672 U CN 214271672U
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- negative poisson
- poisson ratio
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- pier
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- 230000000694 effects Effects 0.000 title claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 17
- 239000003365 glass fiber Substances 0.000 claims description 9
- 239000011208 reinforced composite material Substances 0.000 claims description 7
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 5
- 230000000737 periodic effect Effects 0.000 claims description 3
- 239000006260 foam Substances 0.000 abstract description 8
- 238000010521 absorption reaction Methods 0.000 abstract description 7
- 239000003733 fiber-reinforced composite Substances 0.000 abstract description 5
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 230000035939 shock Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 239000002131 composite material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000009787 hand lay-up Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Landscapes
- Bridges Or Land Bridges (AREA)
Abstract
The utility model discloses a pier anticollision facility with negative poisson ratio effect, fill the core including negative poisson ratio anti-chirality indent structural framework, combined material shell, foam. Due to the deformation characteristic of the tension, expansion and compression of the negative Poisson ratio hole structure, the facility has good energy absorption characteristic. The negative Poisson ratio anti-hand concave structure creatively introduces an inner concave angle on the basis of an anti-hand structure, so that the negative Poisson ratio effect is more obvious when the negative Poisson ratio concave structure bears load. When the ship is impacted, the negative poisson ratio structural frame transversely contracts under pressure. Because the foam fills the cushioning effect of core to negative poisson ratio frame shrinkage deformation, make anticollision institution have longer stress platform section, compare positive poisson ratio material tradition anticollision institution, the utility model discloses an energy consumption performance that shocks resistance is better. In addition, due to the characteristics of light weight and corrosion resistance of the fiber reinforced composite material, the anti-collision facility can float on the water surface.
Description
Technical Field
The utility model relates to a have negative poisson ratio anti-chiral indent mixed structure through the design and design pier anticollision facility that has negative poisson ratio effect, use glass fiber reinforced composite as the basis material of crashproof shell and inside negative poisson ratio anti-chiral indent structural framework, belong to new material new construction and combined material's cross field.
Background
The ship-bridge collision accident often causes bridge piers to be damaged, ships to be damaged, casualties, traffic jam on water roads and the like, and causes a great amount of economic loss, and the problem is widely concerned by scholars at home and abroad. The fiber reinforced composite material with the characteristics of soft material, light weight, high strength, corrosion resistance and the like is used for manufacturing self-floating pier anti-collision facilities and is widely applied to bridge design at present.
The negative poisson's ratio structure has special mechanical properties, and transverse contraction (expansion) occurs when uniaxial compression (stretching) occurs. The sound absorption board has excellent performances in the aspects of shear resistance, indentation resistance, sound absorption, energy absorption and the like. The utility model discloses the novelty will turn over the hand structure and combine together with indent hexagonal structure, designs out a neotype turning over hand indent mixed structure for the first time. The structure is found to have strong energy absorption capacity through finite element simulation.
The utility model discloses combine together negative poisson ratio structure and combined material, utilize the outstanding energy absorption ability of negative poisson ratio structure and fibre reinforced composite's high-strength light performance, design the first negative poisson ratio self-floating pier anticollision facilities who uses fibre reinforced composite as the substrate.
SUMMERY OF THE UTILITY MODEL
The utility model aims at carrying out configuration optimization to current pier anticollision facility to improve its protection to the pier, do and extend into arbitrary similar crashproof energy-absorbing facility, and provided a pier anticollision facility with negative poisson's ratio effect.
The utility model adopts the technical proposal that: a pier collision avoidance facility with a negative Poisson ratio effect is an annular device arranged around a pier and comprises a collision avoidance shell, an inner frame and a filling core;
the base materials of the anti-collision shell and the inner frame are glass fiber reinforced composite materials, and the filling core is PU foam;
the internal frame is an anti-hand concave structure frame, and the periodic arrangement of negative Poisson's ratio anti-hand concave units is adopted;
the length L and the width W of the anti-collision shell are matched with the size of a protected pier;
the rib concave angle of the anti-chiral concave structure frame meets the following requirements: theta is more than or equal to 90 degrees and less than or equal to 180 degrees; the relation between the cell element center distance D of the anti-chiral concave structure frame and the shell length L is as follows: L/D is more than or equal to 15 and less than or equal to 30; the relation between the cell element center distance D and the thickness t of the anti-chiral concave structure frame is as follows: d/t is more than or equal to 5 and less than or equal to 10.
The design method of the pier anti-collision facility with the negative Poisson ratio effect comprises the following steps:
1) designing the sizes of the anti-collision shell, the anti-chiral concave structure frame and the filling core according to the actual size of the pier, wherein the anti-chiral concave structure frame is required to meet the limitation of the theta angle;
2) selecting glass fiber reinforced composite materials as base materials of the anti-collision shell and the internal frame, wherein the glass fiber reinforced composite materials are formed in one step by a hand lay-up method;
3) and filling pre-cut PU foam into the anti-collision outer shell and the inner frame to manufacture the self-floating pier anti-collision facility with the negative Poisson ratio effect.
4) The anti-collision facility of the bridge pier is wrapped around the bridge pier, when the bridge pier bears ship impact, the anti-collision shell made of the fiber reinforced composite materials firstly bears load and then transmits the load to the internal structure, and due to the negative Poisson ratio effect of the anti-chiral concave structure, the internal frame is compressed and contracted and is mutually extruded with the foam core, so that the buffering effect is achieved, and the impact force is greatly weakened.
The utility model discloses its key that produces negative poisson's ratio effect lies in the design of inner frame. The frame is ensured to have ribs with a certain angle, so that the inner frame has a negative Poisson ratio effect, and the whole anti-collision facility has the negative Poisson ratio effect. The pier anti-collision facility designed by the method has obvious negative Poisson ratio effect, and can prevent the inner frame from being bent early due to the existence of the foam filling core. In addition, the designed negative Poisson ratio anti-collision structure not only can be applied to a pier, but also can be applied to other anti-collision energy-absorbing structures, and has certain universality. The internal frame unit of the utility model can also be a negative Poisson ratio cell structure such as a chiral structure and an inwards concave hexagonal structure.
Has the advantages that: utilize the utility model discloses pier anticollision facility that the method designed has great negative poisson ratio effect when pressurized. The inside baffle of traditional pier anticollision facility and foam can not produce fine synergistic effect, the utility model discloses with several aspects efficient cooperations such as the interact of glass fiber reinforced composite, negative poisson's ratio effect, inner frame and foam together to great energy that has cut down the collision and produce. Due to the deformation characteristic of the tension, expansion and compression of the negative Poisson ratio hole structure, the facility has good energy absorption characteristic. The negative Poisson ratio anti-hand concave structure creatively introduces an inner concave angle on the basis of an anti-hand structure, so that the negative Poisson ratio effect is more obvious when the negative Poisson ratio concave structure bears load. When the ship is impacted, the negative poisson ratio structural frame transversely contracts under pressure. Because the foam fills the cushioning effect of core to negative poisson ratio frame shrinkage deformation, make anticollision institution have longer stress platform section, compare positive poisson ratio material tradition anticollision institution, the utility model discloses an energy consumption performance that shocks resistance is better. In addition, due to the characteristics of light weight and corrosion resistance of the fiber reinforced composite material, the anti-collision facility can float on the water surface.
Drawings
FIG. 1 is an overall structure view of a collision avoidance pier installation having a negative Poisson's ratio effect;
FIG. 2 is a top view of a pier collision avoidance facility having a negative Poisson's ratio effect;
FIG. 3 is an anti-hand concave frame of a pier collision avoidance facility with a negative Poisson's ratio effect;
FIG. 4 is another outer shell of an anti-collision facility for piers having a negative Poisson's ratio effect;
fig. 5 and 6 are schematic views of the anti-chiral structure.
Detailed Description
The invention will be further described with reference to the following specific embodiments and the accompanying drawings:
as shown in fig. 1 to 6, a pier collision avoidance facility having a negative poisson's ratio effect, which is an annular device disposed around a pier, includes a collision prevention shell 2, an inner frame 1, and a filling core 1;
the base materials of the anti-collision shell 2 and the inner frame 1 are glass fiber reinforced composite materials, and the filling core 1 is PU foam;
the internal frame 1 is an anti-hand concave structure frame and adopts the periodic arrangement of negative Poisson ratio anti-hand concave units;
the length L and the width W of the anti-collision shell 2 are matched with the size of a protected pier;
the rib concave angle of the anti-chiral concave structure frame meets the following requirements: theta is more than or equal to 90 degrees and less than or equal to 180 degrees; the relation between the cell element center distance D of the anti-chiral concave structure frame and the shell length L is as follows: L/D is more than or equal to 15 and less than or equal to 30; the relation between the cell element center distance D and the thickness t of the anti-chiral concave structure frame is as follows: d/t is more than or equal to 5 and less than or equal to 10.
The design method of the pier anti-collision facility with the negative Poisson ratio effect comprises the following steps:
1) designing the sizes of the anti-collision shell, the anti-chiral concave structure frame and the filling core according to the actual size of the pier, wherein the anti-chiral concave structure frame is required to meet the limitation of the theta angle;
2) selecting glass fiber reinforced composite materials as base materials of the anti-collision shell and the internal frame, wherein the glass fiber reinforced composite materials are formed in one step by a hand lay-up method;
3) and filling pre-cut PU foam into the anti-collision outer shell and the inner frame to manufacture the self-floating pier anti-collision facility with the negative Poisson ratio effect.
4) The anti-collision facility of the bridge pier is wrapped around the bridge pier, when the bridge pier bears ship impact, the anti-collision shell made of the fiber reinforced composite materials firstly bears load and then transmits the load to the internal structure, and due to the negative Poisson ratio effect of the anti-chiral concave structure, the internal frame is compressed and contracted and is mutually extruded with the foam core, so that the buffering effect is achieved, and the impact force is greatly weakened. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention. Components not explicitly described in this example can be implemented using existing techniques.
Claims (1)
1. A pier anti-collision facility with a negative Poisson ratio effect is characterized in that: the bridge pier anti-collision facility is an annular device arranged around a bridge pier and comprises an anti-collision shell, an internal frame and a filling core;
the base materials of the anti-collision shell and the inner frame are glass fiber reinforced composite materials, and the filling core is PU foam;
the internal frame is an anti-hand concave structure frame, and the periodic arrangement of negative Poisson's ratio anti-hand concave units is adopted;
the length L and the width W of the anti-collision shell are matched with the size of a protected pier;
the rib concave angle of the anti-chiral concave structure frame meets the following requirements: theta is more than or equal to 90 degrees and less than or equal to 180 degrees; the relation between the cell element center distance D of the anti-chiral concave structure frame and the shell length L is as follows: L/D is more than or equal to 15 and less than or equal to 30; the relation between the cell element center distance D and the thickness t of the anti-chiral concave structure frame is as follows: d/t is more than or equal to 5 and less than or equal to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023241484.9U CN214271672U (en) | 2020-12-29 | 2020-12-29 | Pier anti-collision facility with negative Poisson ratio effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023241484.9U CN214271672U (en) | 2020-12-29 | 2020-12-29 | Pier anti-collision facility with negative Poisson ratio effect |
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| Publication Number | Publication Date |
|---|---|
| CN214271672U true CN214271672U (en) | 2021-09-24 |
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| CN202023241484.9U Active CN214271672U (en) | 2020-12-29 | 2020-12-29 | Pier anti-collision facility with negative Poisson ratio effect |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112575677A (en) * | 2020-12-29 | 2021-03-30 | 南京工业大学 | Pier anti-collision facility with negative Poisson ratio effect and design method thereof |
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- 2020-12-29 CN CN202023241484.9U patent/CN214271672U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112575677A (en) * | 2020-12-29 | 2021-03-30 | 南京工业大学 | Pier anti-collision facility with negative Poisson ratio effect and design method thereof |
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