JPH04215599A - ultralight sandwich panel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to ultra-light sandwich panels, particularly ultra-light sandwich panels for solar cells.

0002

[Prior Art] Conventionally, carbon fiber reinforced plastics (
The skin made of CFRP (hereinafter referred to as CFRP) has an effective thickness of 0.05 m.
The structure was such that two layers of unidirectional CFRP with a thickness of approximately 300 mm were laminated so that the fiber directions were perpendicular to each other.

FIG. 3 is a side sectional view showing the structure of a conventional ultra-lightweight sandwich panel, and FIG. 4 is an enlarged view of the Y section in FIG. In Figures 3 and 4, 4 is (Figure 3)
is a two-layer laminated CFRP skin, and 4a is (Fig. 4
) is the 0° layer in the 0° direction of the arrow, and 4b is the 90° direction (
This is a 90° layer (towards the front of the paper). Further, 2 (FIG. 3) is an aluminum honeycomb core, and 3 is an epoxy adhesive. As mentioned above, the conventional two-layer stack is a 0° layer and a 90° layer.
° layer, with asymmetrical lamination.

0004

[Problems to be Solved by the Invention] As described above, since the conventional ultra-light sandwich panel has a two-layer asymmetrical lamination of the CFRP skin, the ultra-light sandwich panel has low skin stress due to in-plane compression or bending. CFR easily
Intercell buckling occurred in the P skin. Therefore, there was a problem that the bending rigidity as an ultra-light sandwich panel was low.

The present invention was made to solve the above-mentioned problems, and its object is to increase the bending rigidity of an ultra-light sandwich panel by forming a four-layer symmetrical laminate of CFRP skins.

[0006]

[Means for Solving the Problems] Therefore, the present invention provides an ultra-light sandwich panel having an aluminum honeycomb core and a carbon fiber reinforced plastic skin,
The skin is composed of a four-layer laminate made of unidirectional carbon fiber reinforced plastic, and the first and fourth layers on both sides of the laminate are mutually connected to the second and third layers on the inside. The aim is to achieve this objective by means of an ultra-lightweight sandwich panel with orthogonal symmetrical lamination.

[0007]

[Function] The ultra-light sandwich panel of the present invention has the first and fourth outer layers and the inner second and third layers of a four-layer laminate made of unidirectional CFRP mutually connected to each other. Due to the orthogonal symmetrical lamination, intercell buckling is less likely to occur than in the conventional example.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of an ultra-lightweight sandwich panel which is an embodiment of the present invention, and FIG. 2 is an enlarged view of the Y section in FIG. In the drawings, the same or equivalent components as those in the conventional example are indicated by the same reference numerals, and some parts will be explained repeatedly.

In FIGS. 1 and 2, 1A is an ultra-light sandwich panel, 1B is a symmetrical lamination, and the first layer 1a is the layer in the 0° direction, and the 90° direction (the front direction in the paper)
The skin 1 made of four layers of CFRP consists of a second layer 1b, which is a layer in the 90° direction, a third layer 1c, which is also a layer in the 90° direction, and a fourth layer 1d, which is a layer in the 0° direction. consists of
The first layer 1a and fourth layer 1d on both outer sides of the stack and the second layer 1b and third layer 1c on the inner side are configured to be orthogonal to each other, forming a symmetrical stack. Further, 2 is an aluminum honeycomb core, and 3 is an epoxy adhesive for bonding the skin 1 and the aluminum honeycomb core 2.

Next, a comparative experiment was conducted between this embodiment and the conventional example.

In this case, an aluminum honeycomb core 2 with a cell size of 3/8 inch and a CFRP skin 1 with a converted thickness (effective thickness) of 0.08 to 0.12 mm at a fiber volume content of 60% were used. This comparative experiment will be explained using Table 1.

0012

[Table 1] Table 1 shows the conditions and actual measured values of the bending rigidity tests of the ultra-lightweight sandwich panels of this example and the conventional example. In Table 1, the CFRP skin is (0°/90°/
90°/0°), and the conventional example is (0°).
The test was carried out under the same conditions except for the two-layer asymmetric lamination (°/90°).

As a result, the bending rigidity of the sandwich panel was 3.33×10 5 Kg·mm in the example and 2.43×10 5 Kg·mm in the conventional example, and the ratio of this value to the theoretical value was 96 in the example. %, whereas the conventional example is 70
% and the examples were excellent, and in the examples a high bending rigidity almost close to the theoretical value was obtained.

[0014]

[Effects of the Invention] As described above, according to this invention, CF
Since the RP skin is symmetrically laminated with four layers, the bending rigidity of the ultra-light sandwich panel can be increased.

[Brief explanation of the drawing]

[Fig. 1] Side sectional view of an ultra-light sandwich panel that is an embodiment of the present invention.

[Figure 2] Enlarged view of the Y section in Figure 1

[Figure 3] Side sectional view showing the configuration of a conventional ultra-lightweight sandwich panel

[Figure 4] Enlarged view of the Y section in Figure 3

[Explanation of symbols]

1 Epidermis 1A Ultra lightweight sandwich panel 1B Symmetrical lamination 1a 1st layer 1b 2nd layer 1c 3rd layer 1d 4th layer 2 Aluminum Anicum core 3 Epoxy adhesive In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. An ultra-light sandwich panel having an aluminum honeycomb core and a carbon fiber-reinforced plastic skin, wherein the skin is composed of a four-layer laminate made of unidirectional carbon fiber-reinforced plastic, and wherein The first and fourth layers are on the outside and the second and third layers are on the inside.
An ultra-lightweight sandwich panel characterized by a symmetrical lamination in which the layers are orthogonal to each other.