CN107826227A - A kind of shrinkage pool honeycomb cavity structure anti-impact coating - Google Patents

Abstract

The invention discloses an anti-shock covering layer with concave honeycomb cavity structure, which comprises a panel layer in which concave honeycomb cavities arranged periodically and horizontally are arranged, the panel layer is an aluminum plate or a steel plate and the concave honeycomb cavity The center line of the cell is perpendicular to the propagation direction of the shock wave or elastic wave, and the design is flexible. Covering layers with different thicknesses and different cell expansion angles can be designed according to requirements, and it is easy to manufacture and has strong practicability.

Description

A kind of concave honeycomb cavity structure anti-shock cladding layer

technical field

The invention relates to the anti-shock field, in particular to an anti-shock covering layer with a concave honeycomb cavity structure.

Background technique

As an important maritime combat force, ships have become the main components of the military development of various countries. With the development of modern weapon technology, higher requirements are put forward for the impact resistance of ships. The shock wave produced by underwater non-contact explosions such as torpedoes is the most common source of damage, and how to effectively prevent its damage to ships is very important. The concave honeycomb structure with negative Poisson's ratio characteristics and its outstanding mechanical properties and the designability of the internal cell microstructure have been widely used in aerospace, marine ships, railway transportation and other technical fields as cushioning and energy absorption. Material.

The anti-shock coating usually contains various cavity structures such as spherical and cylindrical cavities. This type of anti-shock coating mainly absorbs shock waves and also has other properties such as impact resistance and protection of the hull against seawater corrosion. The horizontally arranged concave-hole honeycomb impact-resistant cladding has good impact resistance and impact resistance, and can improve the safety performance of underwater structures under instantaneous impact conditions. Compared with the traditional spherical and cylindrical covering layers, the horizontally arranged concave honeycomb cavity covering layer also has a negative Poisson's ratio effect, which is more conducive to the stability protection of the overall structure.

Contents of the invention

The object of the present invention is to provide a horizontally arranged recessed hole honeycomb cavity structure anti-impact coating, which can effectively improve the anti-impact performance, and also has anti-impact ability, can effectively reduce the impact damage of the underwater structure, and is beneficial to the improvement of the underwater structure. The impact resistance of the structure plays an important role to overcome the deficiencies of the prior art.

In order to achieve the above object, the present invention provides the following technical solutions: a concave honeycomb cavity structure anti-shock covering layer, including a panel layer, the panel layer is provided with periodically horizontally arranged concave honeycomb cavities, and the panel layer is an aluminum plate or Steel plate and the center line of the concave honeycomb cavity is perpendicular to the propagation direction of the shock wave or elastic wave.

Preferably, the cross-section of the impact-resistant covering layer of the concave honeycomb cavity structure is any one of the following three arrangements:

(a) The cell expansion angles of all concave honeycomb cavities are all the same;

(b) The cell expansion angle of the concave honeycomb cavity in each layer is the same, and the cell expansion angle of the concave honeycomb cavity between different layers decreases gradually along the stress wave propagation direction;

(c) The cross-sectional area of each layer of honeycomb cavities is the same, and the cross-sectional areas of two adjacent rows of honeycomb cavities are periodically staggered.

The anti-shock wave or anti-collision mechanism of the present invention is briefly described as follows:

(1) Since there are a large number of concave honeycomb cavities in the covering layer, the concave honeycomb has a negative Poisson's ratio characteristic. When the covering layer is compressed in a certain direction, it expands up and down perpendicular to it;

(2) The shock wave propagates to the corners of the concave honeycomb cavity structure. Due to the discontinuity of the structure, the stress wave produces a waveform change (Fig. 4). The continuous waveform change increases their propagation path in the covering layer, which is Means to consume more stress wave energy;

(3) The air impedance is much smaller than the impedance of the cladding panel and the water medium, which changes the impedance characteristics between the hull and the water medium, causing the shock wave to be largely dissipated in the cladding during propagation.

In the present invention, due to the inclusion of the concave honeycomb cavity structure, from a macroscopic point of view, the group velocity (energy propagation velocity) and the equivalent elastic modulus of the covering layer are changed, and these changes are related to the structural parameters (honeycomb cavity unit wall thickness, Cell expansion angle, etc.) are related to the material parameters of the aluminum plate or steel plate itself, and determine the impact resistance of the covering layer.

The invention has the advantage of flexible design, and can design covering layers with different thicknesses and different cell expansion angles according to requirements.

Description of drawings

Fig. 1 (A) is a three-dimensional schematic diagram of the impact-resistant covering layer of the concave honeycomb cavity structure of the present invention, and the concave honeycomb cavities are of the same size.

Fig. 1 (B) is a schematic cross-sectional view of the anti-shock coating of the concave honeycomb cavity structure of the present invention.

Fig. 2 is a three-dimensional schematic diagram of the acoustic covering layer of the honeycomb cavity structure of the present invention, and the cell expansion angle of the concave honeycomb cavity between different layers decreases gradually along the stress wave propagation direction;

Fig. 2 (B) is a schematic cross-sectional view of the anti-shock covering layer in which the cell expansion angle of the concave honeycomb cavity between different layers of the concave honeycomb according to the present invention gradually decreases along the stress wave propagation direction.

Fig. 3 is a force deformation diagram of the concave honeycomb cavity unit.

Fig. 4 is a schematic diagram of the waveform conversion of the stress wave propagating in the concave honeycomb cavity unit.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to the figure, the present invention provides a technical solution: a concave honeycomb cavity structure anti-shock covering layer, including a panel layer 1, and the concave honeycomb cavities 2 arranged horizontally periodically are arranged in the panel layer 1, and the panel layer 1 includes an aluminum plate and the center line of the concave honeycomb cavity 2 is perpendicular to the propagation direction of shock waves or elastic waves.

Wherein, the cross-section of the anti-shock cladding layer with concave honeycomb cavity structure is any one of the following three arrangements:

(a) The cell expansion angles of all concave honeycomb cavities 2 are all the same;

(b) The cell expansion angle of the concave honeycomb cavity 2 in each layer is the same, and the cell expansion angle of the concave honeycomb cavity 2 between different layers decreases gradually along the stress wave propagation direction;

(c) The cross-sectional area of each layer of honeycomb cavities 2 is the same, and the cross-sectional areas of two adjacent rows of honeycomb cavities 2 change periodically.

As shown in Figure 1(A), the centerline of the concave honeycomb cavity is arranged parallel to the surface of the covering layer, and the base material is aluminum or steel. In this embodiment, if different structural parameters are selected, different anti-shock functions can be obtained. If a smaller concave honeycomb cavity size is used, a more stable overall structural performance and greater hydrostatic pressure under deep water can be obtained; if a larger concave honeycomb cavity size is used, it can withstand impact stress It is more conducive to dissipate the impact energy when it produces a larger deformation.

As shown in Figure 2, in this embodiment, the arrangement of concave honeycomb cavities is a layered and gradual form, and the size of the concave honeycomb cavities near the outer side of the covering layer is set to a larger expansion angle, and the inner side of the covering layer (closer to One side of the protected structure) is set to the size of the honeycomb cavity with a smaller expansion angle, and the expansion angle of the concave honeycomb cavity in the middle part of the covering layer changes from large to small. The base material is aluminum or steel. This embodiment has better static pressure bearing capacity and self-deformation and impact resistance at the same time.

Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or perform equivalent replacements for some of the technical features. Within the spirit and principles of the present invention, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present invention.

Claims (2)

1. A concave-hole honeycomb cavity structure impact-resistant covering layer, including a panel layer (1), characterized in that: concave-hole honeycomb cavities (2) arranged horizontally periodically are arranged in the panel layer (1), and the panel layer (1) It includes an aluminum plate and the center line of the concave honeycomb cavity (2) is perpendicular to the propagation direction of shock waves or elastic waves. 2. The anti-shock covering layer with concave honeycomb cavity structure according to claim 1, characterized in that: the cross-section of the anti-shock coating layer with concave honeycomb cavity structure is any one of the following three arrangements: (a) The cell expansion angles of all concave honeycomb cavities (2) are all the same; (b) The cell expansion angle of the concave honeycomb cavity (2) in each layer is the same, and the cell expansion angle of the concave honeycomb cavity (2) between different layers decreases gradually along the stress wave propagation direction; (c) The cross-sectional area of each layer of honeycomb cavities (2) is the same, and the cross-sectional surfaces of two adjacent rows of honeycomb cavities (2) are periodically staggered.