JPH0711346Y2 - Lightweight plate for protection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a lightweight protective plate (hereinafter referred to as a protective plate) that is lightweight, tough, has excellent impact resistance, and has high energy absorption performance.

[Prior Art] Conventionally, various protection plates for airplanes, helicopters, and automobiles (armored vehicles) have been used to protect passengers (life) against projectiles such as bullets and to prevent damage to important equipment such as fuel tanks and engines. Is used. This protective plate usually has a composite structure in which a ceramic tile, a fiber reinforced plastic (hereinafter abbreviated as FRP) plate, and a woven cloth for preventing scattering when the ceramic is damaged are integrally joined.

Further, the defense plate for protection of the airplane, helicopter, automobile, etc. is required to have a larger kinetic energy absorption property for a flying object such as a bullet, and at the same time,
There is a strong demand for lightness in order to further enhance the performance of these airplanes and vehicles.

However, the conventional protective plate is not always sufficient in terms of the energy absorbing property, and the energy absorbing performance generally tends to decrease as the weight is reduced.

[Purpose of device]

An object of the present invention is to provide a defense plate that maintains the lightness of the defense plate and absorbs more kinetic energy of the projectile when a projectile such as a bullet collides with the defense plate. .

[Constitution of device]

The present invention that achieves the above object can integrally laminate a fiber-reinforced plastic plate having a reinforcing fiber cloth on one surface of a ceramic tile and prevent the exposed surface of the ceramic tile from scattering when it is broken. In a lightweight protective plate-like body coated with a woven fabric, a reinforcing fiber cloth of the fiber-reinforced plastic plate is woven from at least three directions in which fiber threads are alternately woven at an angle of a constant interval. The summary is that it is composed of.

〔Example〕

FIG. 1 is a cross-sectional view showing one embodiment of the protective plate of the present invention,
In this defense plate, a FRP plate 1 having a reinforcing fiber cloth is integrally laminated on one side of a ceramic tile 2, and a woven cloth 3 for preventing scattering when the ceramic tile 2 is damaged covers the exposed surface of the ceramic tile 2. The structure is such that they are joined so as to cover them. The thickness of the protective plate having such a composite structure varies depending on its application and application site, but is usually about 15 mm to 30 mm, generally about 20 mm.

The ceramic tile that constitutes the protective plate of the present invention is not particularly limited, and is generally made of alumina, silicon carbide, boron carbide, etc., and has a thickness of about 7 mm to 15 mm, generally. Can use tiles of about 10 mm. However, in order to prevent the damage from spreading as a protective plate, it is preferable that the tile has a structure in which a large number of the tiles are attached to a single FRP plate within a range that does not hinder the productivity.

When this tile is damaged by the impact of a projectile bullet or the like, the woven fabric attached to the tile to prevent the scattering is not particularly limited, and the scattered ceramic tile can be prevented from scattering. I wish I had it. For example, various synthetic fibers such as nylon and polyester fibers,
In particular, a plain woven fabric made of filaments is used. If cost is not taken into consideration, it is needless to say that a woven fabric composed of aramid fiber having high strength and high elastic modulus, glass fiber, high-molecular-weight polyethylene fiber having high drawability and high orientation, which will be described later, can be used.

The feature of the present invention is that FR that is composited with these tiles and woven fabrics.
It is on the P board. That is, it is important for the FRP plate constituting the protective plate of the present invention to use, as the reinforcing fiber cloth, a multiaxial fabric in which fiber threads are woven alternately at least at three directions at regular intervals. Is.

Here, as an example of the multi-axial woven fabric, there is, for example, a triaxial woven fabric shown in FIGS. 2 (a), (b), (c) and (d). As shown in the figure, a triaxial woven fabric always has a basic structure in which three yarns cross each other, and fiber yarns are alternately woven from three directions at an angle of 60 °. Has become. Fig. 2 (a) shows 9 1/4 × 9 1/4 × 9 1 /
Weaving yarns with a weaving density of 4 threads / inch are woven in a basket shape. Fig. 2 (b) shows 18 1/2 × 18 1/2 × 18
Another basic one with a weave density of 1/2 thread / inch, second
Figure (c) is another basic one in which one warp yarn and weft yarn with a weaving density of 37 x 37 x 37 threads / inch floats and two sinks, the second
The figure (d) has a structure in which one warp yarn is woven while being bent at a constant angle.

Such a multiaxial woven fabric has a stress index in the warp direction and the weft direction which is the same as that of a biaxial woven fabric such as a plain woven fabric which is a conventional FRP reinforced fabric, but the stress index in the 45 ° direction is remarkably high. In contrast, in the case of a biaxial woven fabric, the longitudinal and transverse directions of 100 and 45 ° are 25. For example, in the case of a 4-axial woven fabric, the longitudinal and transverse directions are 100 and 45 °.
The stress index in each direction can be the same. Therefore, by using such a multi-axial woven fabric as a reinforcing fiber cloth for FRP, stress in each direction on the same plane of the FRP plate can be obtained without substantially impairing the strength properties in the longitudinal and transverse directions of the FRP plate. The indexes are made uniform, and a strong energy-absorbing power that hinders penetration of projectiles such as bullets can be imparted.

Fibers that make up these multiaxial fabrics include high-strength, high-modulus fibers such as aramid fibers (“Kevlar” or “Technora”), glass fibers, and high-stretch / high-orientation high-molecular-weight polyethylene fibers (“Spectra”). Continuous filament yarns such as ") are preferred. As the matrix resin for the FRP board, there are various known matrix resins for FRP such as epoxy resin, unsaturated polyester resin, polyimide resin, and polyamideimide resin. Further, the thickness of the FRP plate can be appropriately selected within a range of about 7 mm to 15 mm, and it is generally preferable that the FRP plate has a thickness similar to that of the ceramic tile.

A conventional method may be applied correspondingly to the method of manufacturing the protection plate of the present invention. For example, after the FRP plate having the reinforcing fiber cloth made of the multiaxial fabric is joined to the ceramic tile, the exposed surface of the tile is covered with the woven cloth. , Can be easily obtained by joining.

Furthermore, at the time of manufacturing the above protection plate, using a molded FRP plate,
By laminating ceramic tiles on the molding surface in a mosaic shape, it is possible to form a protective plate having a more complicated structure having a curved surface, etc., and various building materials or lightweight metal plates such as duralumin on the surface of the protective plate. Stack and glue
A function, appearance, color and the like can be appropriately given depending on the use and purpose of the protective plate.

[Advantage of the Invention] As described above, according to the present invention, the reinforcing fiber cloth of the fiber reinforced plastic plate is composed of the multi-axial woven fabric in which the fiber threads are alternately woven from at least three directions at regular intervals. When a projectile collides with a lightweight protective plate, the bent parts of the fiber yarns of the multiaxial fabric can extend in each weaving direction, and the fiber reinforced plastic plate can also move in each direction on the same plane. It is possible to more uniformize the stress index with respect to, it is possible to more effectively absorb the high kinetic energy of the projectile that collided, and it is possible to extremely effectively improve the impact absorption resistance.

Further, since it is composed of a combination of a ceramic tile, a fiber reinforced plastic plate, and a woven fabric capable of preventing the ceramic tile from scattering when it is broken, it is possible to maintain the same lightweight state as the conventional one. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing one mode of a lightweight plate-like body for protection of the present invention, and FIGS. 2 (a), (b), (c) and (d) each show a main part of a triaxial woven fabric. It is a top view. 1 ... FRP board, 2 ... ceramic tile, 3 ... scatter prevention woven fabric.

Claims (1)

[Scope of utility model registration request] 1. A woven cloth capable of integrally laminating a fiber reinforced plastic plate having a reinforcing fiber cloth on one side of a ceramic tile and preventing the ceramic tile from scattering at the time of breakage, on the exposed surface of the ceramic tile. In a lightweight protective plate-like body, the reinforcing fiber cloth of the fiber-reinforced plastic plate is composed of a multiaxial woven fabric in which fiber threads are alternately woven from at least three directions at regular intervals. Lightweight plate-shaped body.