JP5092444B2 - Manufacturing method of fiber reinforced composite material - Google Patents

Description

  The present invention relates to a method for producing a fiber reinforced composite material, and in particular, a fiber reinforced composite material body having a predetermined strength used for an impact absorber and the like, and a fragile fiber having a strength lower than that of the fiber reinforced composite material body The present invention relates to a method for producing a fiber-reinforced composite material having a reinforced composite material.

  In vehicles such as automobiles, an impact absorber that absorbs collision energy at the time of a collision or the like is used. In addition to the shock absorber main body that absorbs collision energy, such a shock absorber has a lower strength than the shock absorber main body and is provided with a trigger that absorbs the collision energy due to the collision when it is broken. (For example, Patent Document 1).

Also, such shock absorbers are often manufactured from fiber reinforced composite materials. In the fiber reinforced composite material, the strength is adjusted by adjusting the melting temperature when the raw material is melt-molded (for example, Patent Document 2).
JP-A-8-219215 JP 2003-291141 A

  However, in the shock absorber material disclosed in Patent Document 1, a fiber reinforced composite material is used as a main body, and a shock absorbing portion having a lower strength than the fiber reinforced composite material is attached as a trigger. For this reason, when the shape of the fiber reinforced composite material is complicated, there is a problem that it takes time to attach the fiber reinforced composite material and it is difficult to ensure the quality.

  It is also conceivable to adjust the strength of the fiber-reinforced composite material by the method disclosed in Patent Document 2 above. However, in the method disclosed in Patent Document 2, the porosity is adjusted by adjusting the temperature. For this reason, there existed a problem that the temperature management for forming a weak fiber reinforced composite material will become complicated.

  Therefore, an object of the present invention is to provide a method for manufacturing a fiber-reinforced composite material that can be easily temperature-controlled without attaching another material to be a trigger.

A method for producing a fiber-reinforced composite material according to the present invention that has solved the above problems includes a debulk step of applying a predetermined bag pressure at a predetermined debulk temperature to a prepreg that is cured by heating, and applying the bag pressure. The prepreg thus obtained is heated to a predetermined impregnation temperature and maintained at the impregnation temperature for a predetermined impregnation time, so that the reinforced fiber is impregnated with the curable resin in the prepreg, and the prepreg that has undergone the impregnation step is brought to the predetermined curing temperature. And a curing step of curing the prepreg by holding at a predetermined curing temperature for a predetermined curing time, and is used together with a fiber-reinforced composite material body that is manufactured to be stronger than the fiber-reinforced composite material body. low, fiber-reinforced with a vulnerability fiber-reinforced composite material comprising a trigger to absorb impact energy during collision of the fiber-reinforced composite material In producing a composite material, characterized in that to produce a vulnerability fiber-reinforced composite material by omitting the impregnation step in the manufacture of fiber reinforced composite material body.

  In the method for producing a fiber-reinforced composite material according to the present invention, a brittle fiber-reinforced composite material is provided. By providing this fragile fiber reinforced composite material, it is not necessary to attach another material to serve as a trigger. Moreover, when manufacturing a fragile fiber reinforced composite material, the impregnation process at the time of manufacturing a fiber reinforced composite material main body is omitted. Thus, by omitting the impregnation step and manufacturing the fragile fiber reinforced composite material, for example, the curing temperature and the like can be the same as the case of manufacturing the fiber reinforced composite material body. Therefore, temperature management at the time of manufacturing a fiber reinforced composite material becomes easy.

The method for producing a fiber-reinforced composite material according to the present invention that has solved the above problems includes a debulk step of applying a predetermined bag pressure at a predetermined debulk temperature to a prepreg that is cured by heating, and a bag pressure. The impregnation step of impregnating the reinforced fiber with the curable resin in the prepreg, and the predetermined curing of the prepreg after the impregnation step And a curing step of curing the prepreg by maintaining the curing temperature at a certain curing temperature for a predetermined curing time, and is used together with a fiber reinforced composite material body manufactured, strength low, and a vulnerability fiber-reinforced composite material comprising a trigger to absorb impact energy during collision of the fiber-reinforced composite material In producing a fiber-reinforced composite material, characterized in that to produce a vulnerability fiber-reinforced composite material to be higher than a predetermined debulking temperature debulking temperature of debulking step in the manufacture of fiber reinforced composite material body.

  In the method for producing a fiber-reinforced composite material according to the present invention, a brittle fiber-reinforced composite material is provided. By providing this fragile fiber reinforced composite material, it is not necessary to attach another material to serve as a trigger. Moreover, the debulk temperature of the debulk process at the time of manufacturing a weak fiber reinforced composite material is made higher than a predetermined debulk temperature. By producing a fragile fiber reinforced composite material by raising the debulk temperature in the debulk process above a predetermined debulk temperature, for example, the impregnation temperature and the curing temperature may be the same as in the case of producing a fiber reinforced composite material body. it can. Therefore, temperature management at the time of manufacturing a fiber reinforced composite material becomes easy.

Furthermore, the method for producing a fiber-reinforced composite material according to the present invention that has solved the above problems includes a debulk step of applying a predetermined bag pressure to a prepreg that is cured by heating at a predetermined debulk temperature, and a bag pressure. The impregnation step of impregnating the reinforced fiber with the curable resin in the prepreg, and the predetermined curing of the prepreg after the impregnation step And a curing step of curing the prepreg by maintaining the curing temperature at a certain curing temperature for a predetermined curing time, and is used together with a fiber reinforced composite material body manufactured, strength low, with the vulnerable fiber-reinforced composite material comprising a trigger to absorb impact energy during collision of the fiber-reinforced composite material In manufacturing a fiber reinforced composite material, the bag pressure applied in the debulk process, the impregnation process, and the curing process in manufacturing the fiber reinforced composite material body is made lower than a predetermined bag pressure, and the fragile fiber reinforced composite material is manufactured. It is characterized by manufacturing.

  In the method for producing a fiber-reinforced composite material according to the present invention, a brittle fiber-reinforced composite material is provided. By providing this fragile fiber reinforced composite material, it is not necessary to attach another material to serve as a trigger. In addition, the back pressure applied in the debulk process, the impregnation process, and the curing process in manufacturing the fragile fiber reinforced composite material is set lower than a predetermined back pressure. By making the back pressure applied in the debulk process, the impregnation process, and the curing process lower than the predetermined back pressure, the brittle fiber reinforced composite material is manufactured. It can be the same as in the case of manufacturing. Therefore, temperature management at the time of manufacturing a fiber reinforced composite material becomes easy.

And the manufacturing method of the fiber reinforced composite material which concerns on this invention which solved the said subject is the debulk process which applies a predetermined bag pressure on a predetermined debulk temperature with respect to the prepreg which hardens | cures by heating, Bag pressure The impregnation step of impregnating the reinforced fiber with the curable resin in the prepreg, and the predetermined curing of the prepreg after the impregnation step And a curing step of curing the prepreg by maintaining the curing temperature at a certain curing temperature for a predetermined curing time, and is used together with a fiber reinforced composite material body manufactured, strength low, with the vulnerable fiber-reinforced composite material comprising a trigger to absorb impact energy during collision of the fiber-reinforced composite material When manufacturing a fiber reinforced composite material, the debulk process in manufacturing the fiber reinforced composite material body is omitted, and the bag pressure applied in the impregnation process and the curing process is set to 0 to manufacture a fragile fiber reinforced composite material. To do.

  In the method for producing a fiber-reinforced composite material according to the present invention, a brittle fiber-reinforced composite material is provided. By providing this fragile fiber reinforced composite material, it is not necessary to attach another material to serve as a trigger. Moreover, the debulk process in manufacturing a fragile fiber reinforced composite material is omitted. By manufacturing the fragile fiber reinforced composite material by omitting the debulk process and reducing the back pressure applied in the impregnation process and the curing process to 0, for example, the impregnation temperature and the curing temperature are the same as in the case of manufacturing the fiber reinforced composite material body. can do. Therefore, temperature management at the time of manufacturing a fiber reinforced composite material becomes easy.

  According to the method for manufacturing a fiber-reinforced composite material according to the present invention, it is possible to facilitate temperature management without attaching another material to be a trigger.

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. The fiber-reinforced composite material according to the present embodiment has, for example, the shape shown in FIG. The fiber reinforced composite material 1 includes a fiber reinforced composite material body 2 and a fragile fiber reinforced composite material 3 having lower strength than the fiber reinforced composite material body 2. This fiber reinforced composite material 1 is used as, for example, an impact absorber of a vehicle, and the fragile fiber reinforced composite material 3 serves as a trigger for absorbing collision energy due to a collision.

  Below, the manufacturing process of the fiber reinforced composite material main body 2 is demonstrated, and the manufacturing process of the brittle fiber reinforced composite material 3 is demonstrated continuously.

  As shown in FIG. 2, when manufacturing the fiber reinforced composite material body 2, first, preparation for manufacturing the fiber reinforced composite material body 2 is performed. In preparation for production, a prepreg 10 is prepared by laminating a plurality of prepreg base materials (reinforced base materials) each including a thermosetting resin and a fiber bundle. The prepreg 10 is placed on the aluminum plate 11. At this time, the release film 12 is interposed between the aluminum plate 11 and the prepreg 10. Subsequently, the prepreg 10 is covered with the back film 13. Here, the release film 12 is also interposed between the prepreg 10 and the back film 13.

  When the prepreg 10 is covered with the back film 13, the sealant 14 is interposed between the periphery of the back film 13 and the aluminum plate 11 to seal the space between the aluminum plate 11 and the back film 13. Further, a vacuum valve 15 is attached to the back film 13, and a vacuum pump (not shown) is connected to the vacuum valve 15. Thereafter, the back pressure is kept applied until the curing process is completed.

  Thus, when the preparation for manufacturing the fiber reinforced composite material body 2 is completed, the fiber reinforced composite material body 2 is manufactured by curing the prepreg 10 according to the time chart shown in FIG. When the prepreg 10 is cured, a debulk process is first performed. In the debulk process, the vacuum pump is operated for 30 minutes at room temperature (25 ° C.), which is a predetermined debulk temperature, and the air between the aluminum plate 11 and the back film 13 is sucked so that the aluminum plate 11 and the back film 13 A back pressure of 0.1 MPa is applied between them. For this reason, a back pressure of 0.1 MPa is applied to the prepreg 10. Thereafter, the prepreg 10 is put in an oven together with the aluminum plate 11 and the back film 13 and the like, and again sucked with a vacuum pump so that the back pressure becomes 0.1 MPa until the molded product is taken out.

  After the debulk process is completed, the process proceeds to the impregnation process. In the impregnation step, the prepreg 10 is put into an oven, and the temperature is increased at a temperature increase rate of 4 ° C./min, and the temperature is increased to 90 ° C., which is a predetermined impregnation temperature, over 16 minutes. When the temperature of the prepreg 10 is raised to 90 ° C., the prepreg 10 is held as it is for a predetermined impregnation time of 60 minutes. In this impregnation step, the fiber bundle in the prepreg 10 is sufficiently impregnated with the thermosetting resin.

  After the impregnation step, the process proceeds to the curing step. In the curing step, the temperature of the prepreg 10 is increased at a temperature increase rate of 4 ° C./min, and the temperature is increased to 130 ° C., which is a predetermined curing temperature, over 10 minutes. When the temperature of the prepreg 10 is raised to 130 ° C., the prepreg 10 is held as it is for a predetermined curing time of 90 minutes. In this curing step, the prepreg 10 is sufficiently cured.

  When the curing process is completed, the temperature of the prepreg 10 is lowered to room temperature by natural cooling. Thereafter, the back film 13 is peeled off from the aluminum plate 11, and the molded product is taken out from the aluminum plate 11. This molded product becomes the fiber-reinforced composite material body 2. In this way, the fiber reinforced composite material body 2 is manufactured. The fiber-reinforced composite material body 2 manufactured in this way is manufactured as a high-strength material that hardly causes voids or delamination between prepreg substrates.

  Next, the manufacturing process of the fragile fiber reinforced composite material 3 having a lower strength than the fiber reinforced composite material body 2 will be described. As a manufacturing process of the fragile fiber reinforced composite material 3, there are a first process to a fourth process. Hereinafter, each process will be described sequentially.

<First step>
In the first step of the fragile fiber reinforced composite material 3, first, preparation similar to that in the manufacturing process of the fiber reinforced composite material body 2 is performed. Subsequently, the brittle fiber reinforced composite material 3 is manufactured by curing the prepreg 10 according to the time chart shown in FIG. When the prepreg 10 is cured, a debulk process is performed. In the debulk process, the vacuum pump is operated for 30 minutes at room temperature (25 ° C.), which is a predetermined debulk temperature, and the air between the aluminum plate 11 and the back film 13 is sucked so that the aluminum plate 11 and the back film 13 A back pressure of 0.1 MPa is applied between them. For this reason, a back pressure of 0.1 MPa, which is a predetermined back pressure, is applied to the prepreg 10. Thereafter, the prepreg 10 is put in an oven together with the aluminum plate 11 and the back film 13 and the like, and again sucked with a vacuum pump so that the back pressure becomes 0.1 MPa until the molded product is taken out.

  When the debulk process is completed, the process proceeds to the curing process without going through the impregnation process. In the curing step, the temperature of the prepreg 10 is increased at a temperature increase rate of 4 ° C./min, and the temperature is increased to 130 ° C. which is a predetermined curing temperature over 26 minutes. When the temperature of the prepreg 10 is raised to 130 ° C., the impregnation step is omitted, and the prepreg 10 is held for 150 minutes by adding a predetermined impregnation time to a predetermined curing time. In this curing step, the prepreg 10 is cured.

  When the curing process is completed, the temperature of the prepreg 10 is lowered to room temperature by natural cooling. Thereafter, the back film 13 is peeled off from the aluminum plate 11, and the molded product is taken out from the aluminum plate 11. This molded product becomes the brittle fiber reinforced composite material 3. In this way, the brittle fiber reinforced composite material 3 is manufactured.

  In the manufacturing process of the fragile fiber reinforced composite material 3 thus manufactured, the impregnation process is omitted as compared with the process of manufacturing the fiber reinforced composite material body 2. By omitting the impregnation step, curing of the thermosetting resin is accelerated before the fiber bundle in the prepreg 10 is completely impregnated with the thermosetting resin. For this reason, many small voids are generated inside the fiber bundle. By generating small voids in this way, the strength of the fragile fiber reinforced composite material 3 can be reduced with respect to the fiber reinforced composite material body 2.

<Second process>
In the second step of the fragile fiber reinforced composite material 3, first, the same manufacturing preparation as the manufacturing preparation in the manufacturing process of the fiber reinforced composite material body 2 is performed. Subsequently, the brittle fiber reinforced composite material 3 is manufactured by curing the prepreg 10 along the time chart shown in FIG. When the prepreg 10 is cured, a debulk process is performed. In the debulk process, the vacuum pump is operated for 30 minutes at a temperature higher than room temperature, which is a predetermined debulk temperature, for example, 30 ° C. to 80 ° C., and the air between the aluminum plate 11 and the back film 13 is sucked. A back pressure of 0.1 MPa is applied between the aluminum plate 11 and the back film 13. For this reason, a back pressure of 0.1 MPa, which is a predetermined back pressure, is applied to the prepreg 10. Thereafter, the prepreg 10 is put in an oven together with the aluminum plate 11 and the back film 13 and the like, and again sucked with a vacuum pump so that the back pressure becomes 0.1 MPa until the molded product is taken out.

  After the debulk process is completed, the process proceeds to the impregnation process. In the impregnation step, the prepreg 10 is put into an oven, and the temperature is increased at a temperature increase rate of 4 ° C./min, and the temperature is increased to 90 ° C., which is a predetermined impregnation temperature, over 16 minutes. When the temperature of the prepreg 10 is raised to 90 ° C., the prepreg 10 is held as it is for a predetermined impregnation time of 60 minutes. In this impregnation step, the fiber bundle in the prepreg 10 is impregnated with the thermosetting resin.

  After the impregnation step, the process proceeds to the curing step. In the curing step, the temperature of the prepreg 10 is increased at a temperature increase rate of 4 ° C./min, and the temperature is increased to 130 ° C., which is a predetermined curing temperature, over 10 minutes. When the temperature of the prepreg 10 is raised to 130 ° C., the prepreg 10 is held as it is for a predetermined curing time of 90 minutes. In this curing step, the prepreg 10 is cured.

  When the curing process is completed, the temperature of the prepreg 10 is lowered to room temperature by natural cooling. Thereafter, the back film 13 is peeled off from the aluminum plate 11, and the molded product is taken out from the aluminum plate 11. This molded product becomes the brittle fiber reinforced composite material 3. In this way, the brittle fiber reinforced composite material 3 is manufactured.

  In the manufacturing process of the fragile fiber reinforced composite material 3 manufactured in this way, the debulk temperature in the debulk process is higher than that in the process of manufacturing the fiber reinforced composite material body 2. In the debulk process, a large air layer present between layers in the prepreg 10 is discharged. However, when the debulk temperature is increased, the viscosity of the thermosetting resin is decreased. For this reason, since the route which discharges the medium air ball which exists between fiber bundles is closed, a medium void will occur between fiber bundles. Generation | occurrence | production of this inside void can reduce the intensity | strength of the weak fiber reinforced composite material 3 with respect to the fiber reinforced composite material main body 2. FIG.

<Third process>
In the third step of the fragile fiber reinforced composite material 3, first, manufacturing preparation similar to the manufacturing preparation in the manufacturing step of the fiber reinforced composite material body 2 is performed. Subsequently, the brittle fiber reinforced composite material 3 is manufactured by curing the prepreg 10 along the time chart shown in FIG. When the prepreg 10 is cured, a debulk process is performed. In the debulk process, the vacuum pump is operated for 30 minutes at room temperature (25 ° C.), which is a predetermined debulk temperature, and the air between the aluminum plate 11 and the back film 13 is sucked so that the aluminum plate 11 and the back film 13 A back pressure of 0.075 MPa or less is applied between them. For this reason, a back pressure of 0.075 MPa or less, which is lower than 0.1 MPa, which is a predetermined back pressure when the fiber reinforced composite material body 2 is manufactured, is applied to the prepreg 10. Thereafter, the prepreg 10 is placed in an oven together with the aluminum plate 11 and the back film 13 and the like, and again sucked with a vacuum pump so that the back pressure becomes 0.075 MPa or less until the molded product is taken out.

  After the debulk process is completed, the process proceeds to the impregnation process. In the impregnation step, the prepreg 10 is put into an oven, and the temperature is increased at a temperature increase rate of 4 ° C./min, and the temperature is increased to 90 ° C., which is a predetermined impregnation temperature, over 16 minutes. When the temperature of the prepreg 10 is raised to 90 ° C., the prepreg 10 is held as it is for a predetermined impregnation time of 60 minutes. In this impregnation step, the fiber bundle in the prepreg 10 is impregnated with the thermosetting resin.

  After the impregnation step, the process proceeds to the curing step. In the curing step, the temperature of the prepreg 10 is increased at a temperature increase rate of 4 ° C./min, and the temperature is increased to 130 ° C., which is a predetermined curing temperature, over 10 minutes. When the temperature of the prepreg 10 is raised to 130 ° C., the prepreg 10 is held as it is for a predetermined curing time of 90 minutes. In this curing step, the prepreg 10 is cured.

  The back pressure applied in these impregnation and curing steps is 0.075 MPa or less, which is lower than the predetermined back pressure of 0.1 MPa.

  When the curing process is completed, the temperature of the prepreg 10 is lowered to room temperature by natural cooling. Thereafter, the back film 13 is peeled off from the aluminum plate 11, and the molded product is taken out from the aluminum plate 11. This molded product becomes the brittle fiber reinforced composite material 3. In this way, the brittle fiber reinforced composite material 3 is manufactured.

  In the manufacturing process of the fragile fiber reinforced composite material 3 manufactured in this way, the back pressure applied in the debulk process, the impregnation process, and the curing process is set lower than in the process of manufacturing the fiber reinforced composite material body 2. In the debulk process, a large air layer present between the layers in the prepreg 10 is discharged. However, when the back pressure is lowered, the large air layer between the fiber bundles cannot be pushed out. For this reason, large voids are generated between the fiber bundles. Generation | occurrence | production of this large void can reduce the intensity | strength of the weak fiber reinforced composite material 3 with respect to the fiber reinforced composite material main body 2. FIG.

<4th process>
In the fourth step of the fragile fiber reinforced composite material 3, the prepreg 10 is heated without applying a back pressure to the prepreg 10. For this reason, as preparation for manufacturing the fragile fiber reinforced composite material 3, first, the prepreg 10 and the aluminum plate 11 are prepared, and the prepreg 10 is placed on the aluminum plate 11. At this time, the release film 12 is interposed between the aluminum plate 11 and the prepreg 10. In this way, preparation for manufacturing is completed.

  When the preparation for manufacturing is completed, the prepreg 10 is subsequently cured along the time chart shown in FIG. 7 to manufacture the brittle fiber reinforced composite material 3. In this manufacturing process, after the manufacturing preparation is completed, the process proceeds to the impregnation process without passing through the debulk process. In the impregnation step, the prepreg 10 and the aluminum plate 11 are placed in an oven, and the temperature is increased at a temperature increase rate of 4 ° C./min, and the temperature is increased to 90 ° C., which is a predetermined impregnation temperature, over 16 minutes. When the temperature of the prepreg 10 is raised to 90 ° C., the prepreg 10 is held as it is for a predetermined impregnation time of 60 minutes. In this impregnation step, the fiber bundle in the prepreg 10 is impregnated with the thermosetting resin.

  After the impregnation step, the process proceeds to the curing step. In the curing step, the temperature of the prepreg 10 is increased at a temperature increase rate of 4 ° C./min, and the temperature is increased to 130 ° C. which is a predetermined curing temperature over 20 minutes. When the temperature of the prepreg 10 is raised to 130 ° C., the prepreg 10 is held as it is for a predetermined curing time of 90 minutes. In this curing step, the prepreg 10 is cured.

  The back pressure applied in these impregnation and curing steps is zero.

  When the curing process is completed, the temperature of the prepreg 10 is lowered to room temperature by natural cooling. Thereafter, the molded product is taken out from the aluminum plate 11. This molded product becomes the brittle fiber reinforced composite material 3. In this way, the brittle fiber reinforced composite material 3 is manufactured.

  In the manufacturing process of the fragile fiber reinforced composite material 3 manufactured in this way, the debulk process is omitted compared to the process of manufacturing the fiber reinforced composite material body 2. In the debulk process, a large air layer existing between the layers in the prepreg 10 is discharged. However, by omitting the debulk process, a large air layer remains between the layers in the prepreg 10. Due to the presence of this air layer, delamination occurs in the prepreg 10. By this delamination, the strength of the fragile fiber reinforced composite material 3 can be reduced with respect to the fiber reinforced composite material body 2.

  By using the brittle fiber reinforced composite material 3 manufactured through any one of the first to fourth steps as a trigger that absorbs collision energy, for example, other materials to be used as a trigger are attached. The fiber-reinforced composite material can be manufactured without any problems. Further, in the production of the fragile fiber reinforced composite material, any temperature management similar to the temperature management at the time of manufacturing the fiber reinforced composite material main body may be performed, so that the temperature management can be facilitated. .

  Hereinafter, the strength of the fiber reinforced composite material body 2 and the fragile fiber reinforced composite material 3 manufactured in each manufacturing process in the present embodiment will be described. In order to examine the strength of the fiber reinforced composite material main body 2 and the fragile fiber reinforced composite material 3, the inventors conducted the following experiment. In the experiment, a prepreg made of carbon fiber / epoxy and having a laminated structure of [45 / −45 / 0/90/45 / −45] was used. The fiber reinforced composite material main body 2 and the brittle fiber reinforced composite material 3 were each manufactured seven times for each of the prepregs, and the strength was measured. In addition, 70 degreeC debulk temperature was set as 30 degreeC-80 degreeC debulk temperature in a 2nd process. In addition, a back pressure of 0.05 MPa was applied as a back pressure of 0.075 MPa or less in the third step. The measurement results are shown in FIG.

  As can be seen from FIG. 8, the fragile fiber reinforced composite material 3 produced by the first step has an interlaminar shear strength reduced by about 3% compared to the fiber reinforced composite material body 2. Here, many small voids were confirmed between the layers in the fragile fiber reinforced composite material 3. Further, the fragile fiber reinforced composite material 3 produced by the second step had an interlayer shear strength of about 5% lower than that of the fiber reinforced composite material body 2. Here, a large number of medium voids were confirmed between the layers in the fragile fiber reinforced composite material 3.

  Furthermore, the brittle fiber reinforced composite material 3 produced by the third step had an interlayer shear strength of about 20% lower than that of the fiber reinforced composite material body 2. Here, many large voids were confirmed between the layers in the fragile fiber reinforced composite material 3. And the brittle fiber reinforced composite material 3 manufactured by the 4th process fell about 40% in interlayer shear strength compared with the fiber reinforced composite material main body 2. FIG. Here, delamination was confirmed between the layers in the fragile fiber reinforced composite material 3.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the above embodiment, a predetermined debulk temperature and back pressure, impregnation temperature and curing temperature, and further impregnation time and curing time are specified, respectively. It can be appropriately determined according to properties such as strength and shape required for the reinforced composite material. Moreover, although the said embodiment demonstrated the example which uses a fiber reinforced composite material for an impact absorber, it can also be set as the aspect used for the specimen (test piece) in a nondestructive inspection, for example.

It is a perspective view of a fiber reinforced composite material. It is a sectional side view which shows the state at the time of manufacturing a fiber reinforced composite material typically. It is a time chart of the process of manufacturing a fiber reinforced composite material main body. It is a time chart of the 1st process which manufactures a weak fiber reinforced composite material. It is a time chart of the 2nd process which manufactures a weak fiber reinforced composite material. It is a time chart of the 3rd process which manufactures a weak fiber reinforced composite material. It is a time chart of the 4th process which manufactures a weak fiber reinforced composite material. It is a graph which shows the interlayer shear strength of a fiber reinforced composite material main body and a brittle fiber reinforced composite material.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Fiber reinforced composite material, 2 ... Fiber reinforced composite material main body, 3 ... Fragile fiber reinforced composite material, 10 ... Prepreg, 11 ... Aluminum plate, 12 ... Release film, 13 ... Back film, 14 ... Sealant, 15 ... Vacuum valve.

Claims (4)

A debulk step of applying a predetermined bag pressure at a predetermined debulk temperature to a prepreg that is cured by being heated;
Impregnation step of impregnating reinforcing fiber in the prepreg with a reinforced fiber by raising the prepreg subjected to the bag pressure to a predetermined impregnation temperature and holding the impregnation temperature for a predetermined impregnation time;
A curing step of curing the prepreg by raising the temperature of the prepreg that has undergone the impregnation step to a predetermined curing temperature, and maintaining the predetermined curing time at the predetermined curing temperature;
A fragile fiber reinforced composite material that is used together with a fiber reinforced composite material body that is manufactured to include, and has a lower strength than the fiber reinforced composite material body and serves as a trigger for absorbing collision energy when the fiber reinforced composite material collides In producing a fiber reinforced composite material comprising
A method for producing a fiber reinforced composite material, wherein the brittle fiber reinforced composite material is produced by omitting the impregnation step in producing the fiber reinforced composite material body. A debulk step of applying a predetermined bag pressure at a predetermined debulk temperature to a prepreg that is cured by being heated;
Impregnation step of impregnating reinforcing fiber in the prepreg with a reinforced fiber by raising the prepreg subjected to the bag pressure to a predetermined impregnation temperature and holding the impregnation temperature for a predetermined impregnation time;
A curing step of curing the prepreg by raising the temperature of the prepreg that has undergone the impregnation step to a predetermined curing temperature, and maintaining the predetermined curing time at the predetermined curing temperature;
A fragile fiber reinforced composite material that is used together with a fiber reinforced composite material body that is manufactured to include, and has a lower strength than the fiber reinforced composite material body and serves as a trigger for absorbing collision energy when the fiber reinforced composite material collides In producing a fiber reinforced composite material comprising
A method for producing a fiber reinforced composite material, wherein the fragile fiber reinforced composite material is produced by making a debulk temperature in the debulk step higher than the predetermined debulk temperature when producing the fiber reinforced composite material body. . A debulk step of applying a predetermined bag pressure at a predetermined debulk temperature to a prepreg that is cured by being heated;
Impregnation step of impregnating reinforcing fiber in the prepreg with a reinforced fiber by raising the prepreg subjected to the bag pressure to a predetermined impregnation temperature and holding the impregnation temperature for a predetermined impregnation time;
A curing step of curing the prepreg by raising the temperature of the prepreg that has undergone the impregnation step to a predetermined curing temperature, and maintaining the predetermined curing time at the predetermined curing temperature;
A fragile fiber reinforced composite material that is used together with a fiber reinforced composite material body that is manufactured to include, and has a lower strength than the fiber reinforced composite material body and serves as a trigger for absorbing collision energy when the fiber reinforced composite material collides In producing a fiber reinforced composite material comprising
Producing the fragile fiber reinforced composite material by making the bag pressure applied in the debulk step, the impregnation step, and the curing step lower in manufacturing the fiber reinforced composite material body than the predetermined bag pressure. A method for producing a fiber-reinforced composite material. A debulk step of applying a predetermined bag pressure at a predetermined debulk temperature to a prepreg that is cured by being heated;
Impregnation step of impregnating reinforcing fiber in the prepreg with a reinforced fiber by raising the prepreg subjected to the bag pressure to a predetermined impregnation temperature and holding the impregnation temperature for a predetermined impregnation time;
A curing step of curing the prepreg by raising the temperature of the prepreg that has undergone the impregnation step to a predetermined curing temperature, and maintaining the predetermined curing time at the predetermined curing temperature;
A fragile fiber reinforced composite material that is used together with a fiber reinforced composite material body that is manufactured to include, and has a lower strength than the fiber reinforced composite material body and serves as a trigger for absorbing collision energy when the fiber reinforced composite material collides In producing a fiber reinforced composite material comprising
A fiber reinforced composite material, wherein the fragile fiber reinforced composite material is manufactured by omitting the debulk step in manufacturing the fiber reinforced composite material body and setting a bag pressure applied in the impregnation step and the curing step to 0. Manufacturing method.

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