JPS6032985Y2 - Fiber-reinforced plastic profiles - Google Patents

Description

[Detailed description of the invention] This invention is based on a mold material that has directionality in strength and has a constant cross section, which is obtained by pultrusion molding such as mold material hardening continuous pultrusion molding of fiber reinforced plastic (hereinafter referred to as FRP). By improving the fracture strength of the material, it increases the reinforcement of the material and provides a material that can be used as a member that requires reinforcement. , 50-60k for the cutout part ■ (see Figure 1)
The strength of the product is 20 to 30 kg/-, but the strength of the main body is only 20 to 30 kg/-, which is not the theoretical strength.

This failure mode had the disadvantage that local compressive failure in the vicinity of the indenter preceded it, and the strength of the material could not be demonstrated.

! It is thought that increasing the compressive strength of the material in unidirectionally reinforced materials for RP pultrusion will lead to an improvement in the overall strength.

In other words, when the compressive strength of this unidirectional reinforcement is partially understood, as shown in Figure 3, continuous filament groups 1 such as long glass fibers are arranged in the longitudinal direction, and the composite law of FRP is violated. However, in the direction perpendicular to this, as shown in Figure 4, there are only particles of continuous filament group 1 in the matrix, and there is only the strength of the matrix and short fibers 2, and the composite law of FRP is It can be said that it is difficult to stand and has extremely low strength in the longitudinal direction.

Possible ways to increase the strength in the direction perpendicular to the longitudinal direction include increasing the cross-sectional area or arranging more glass cloth substrates, but this will reduce the number of continuous filament groups, resulting in a decrease in the strength in the longitudinal direction. There are drawbacks such as.

This invention solves the two problems mentioned above by providing a profile that increases the pressure-receiving area without increasing the cross-sectional area, and also provides strength due to the ribs having smooth arcuate surfaces or slopes. be.

The details of this invention will be explained below based on the attached drawings.

In the first embodiment shown in FIG. 5, 11 is a group of continuous filaments, such as a group of filaments made of long glass fibers aligned in the longitudinal direction, called glass fiber rovings;
Reference numeral 12 denotes a mat layer and/or cloth layer made of glass fiber or the like that surrounds the mat layer and/or cloth layer, both of which are impregnated with thermosetting plastic and pultruded. The ribs 13, 13' are the shape.

The tip and part of the corner of the leg portion 16 of the rib 13 are formed into a circular arc surface 14, and the radius of the circular arc surface 14 is R1, the thickness of the leg portion 16 is a1, the width of the end surface of the rib 13 is b, as follows: (i ) = b = la (usually 0.5l-2a) (i
i)...R=2a (usually 0.5a or more, preferably 0.5a to 3a).

Also, a slope 15 may be used instead of the arcuate surface 14, but the width C of this slope 15 or rib is (iii)...''C=2a-(usually 0.5a or more,
The range is preferably 0.5a to 2a).

Incidentally, the relational expressions (i), (ii), and (iii) above also apply to the example products shown below (FIGS. 6 and 7).

FIG. 6 shows the case of an H-shape, in which a rib 13 similar to that shown in FIG. 5 is provided at the end of each leg 16.

In addition, a connecting portion 17 and a leg portion 16 that connect the leg portions 16 on both sides are provided.
It is preferable that the corner portions where the two are connected are also connected smoothly by the arcuate surface 18 or the slope.

The device shown in FIG. 5 has a channel shape, and ribs 13 are also provided at both ends of the upper connecting portion 17, that is, at part of the corners.

In FIG. 7, the channel type shown in FIG. 5 is reversed, and connecting portions 17 are provided at the upper ends of both leg portions 16 facing outward, and downward leg portions 16 are provided at both ends (parts of the corners) of the connecting portions 17. A rib 13 is provided at the outer end (part of the corner) of each connecting portion 17.

In this case as well, the shape of the rib 13 is the same.

In addition, on the inside of the connecting portion 17, that is, on the side where the leg portions 16 are provided, the central portion is a flat surface 18, and both side portions are sloped surfaces 19 of approximately 50 mm.
It is said that

Materials for the continuous filament group, mat, and cloth used in this invention include inorganic fibers such as glass fiber and carbon fiber, and organic fibers such as polyester fiber.

In addition, examples of the material of the matrix include thermosetting resins such as unsaturated polyester resins and exo resins.

Strength tests were conducted on the channel-shaped profile of this invention shown in Figure 7 and a conventional channel-shaped profile with the same dimensions but without ribs (the cross-sectional area of the profile was the same for the conventional channel and the channel of this invention). .

As shown in the table below, the results showed that this idea was much stronger.

FIG. 8 shows a dimensional hole drawing of the cross section of the channel used in the test.

As the conventional shape material, a shape material having the same cross-sectional width without a rib having a cross-sectional shape was used.

Glass roving and chopped glass fiber strand mats were used as the fiber base materials of the FRP shapes used in the above tests, and unsaturated polyester resin was used as the resin.

The content of the fiber base material in the mold material was 5% by solubility, and the content of matte in the fiber base material was 2% by solubility per 10 parts by weight of the glass roving.

In this invention, glass rovings are preferably used as the continuous filament group.

In addition, in the mold material of this invention, the fiber base material content is usually 45
~60% by volume, preferably 48-57% by volume.

Further, the ratio of continuous filament group and mat (and/or cloth) used is as follows.

That is, the mat (
and/or cross) is usually used in an amount of 15 to 35 parts by volume, preferably 20 to 3 parts by volume.

Furthermore, in this invention, the preferred fiber composition of the shape material is the ninth
As shown in the figure, a continuous filament (e.g. glass roving) 21 is placed in the center of the shape, and a chopped strand mat (e.g. glass fiber chopped strand mat) 22 is arranged around it, and a surfacing mat (thin 1 m thick) 22 is arranged around it. (vinylon paper, glass paper, etc.) 23 are arranged.

The amount of the surfacing mat used is approximately 0.5 to 3 parts by volume per 10 parts of the continuous filament group used.

It should be noted that FIG. 9 shows only the legs of the molded material of this invention as shown in FIG. 6.

The FRP profile of this invention has significantly improved strength against loads applied in a direction perpendicular to the longitudinal direction by providing ribs having smooth arcuate surfaces or slopes at the corners as described above.

In other words, the channel material 2 without ribs as shown in FIG.
In the case of 0, the bending failure mode is such that the legs 21 open as shown by the chain lines in FIG. 10, and the shape cannot be maintained, so that the bending failure mode is caused by a relatively light load.

However, since the shaped material of this invention has ribs at the corners, it has the unique effect of being able to withstand a fairly large load without deforming.

Furthermore, it goes without saying that the strength can be further increased by providing ribs on the legs.

[Brief explanation of drawings]

Figures 1 to 4 are strength illustrations of unidirectional reinforcement materials.
Figure 2 and Figure 2 are perspective views, Figure 3 is a cross-sectional view of Figure 2.
Figure 4 is a cross-sectional view taken along the line y-y of Figure 2.
' shows a perpendicular cross-sectional view taken along the line. 5 to 7 are perspective views showing each embodiment of this invention. Figure 8 is a cross-sectional view of the mold material of this invention used in the strength test.
FIG. 9 is a partially cutaway sectional view showing a preferable fiber structure in the mold material of this invention, and FIG. 10 is a sectional view showing an example of a conventional mold material. 11... Continuous filament group, 12...
・Matt layer, 13...Rib, 14.18...
...Arc surface, 15...Slope, 16...
・Legs, 17...Connection part.

Claims (1)

[Claims for Utility Model Registration] l In a shaped material made of reinforced plastic with a fiber structure in which a mat layer and/or a cross layer of fibers are arranged around a group of continuous filaments aligned in the longitudinal direction, and has legs and corner parts. , a fiber-reinforced plastic profile with ribs at least at the corners. 2. The fiber-reinforced plastic profile described in claim 1 of the Utility Model Registration Claim, in which ribs are provided on both the leg portions and the corner portions.