JP7366652B2 - T-shaped composite structural member - Google Patents

Description

The present invention relates to a T-shaped composite structural member made of a metal member and a fiber-reinforced resin member.

Patent Document 1 below discloses several types of composite structural members made of metal members (aluminum members) and fiber-reinforced resin members (CFRTP members: Carbon Fiber Reinforced Thermo Plastics). An example in which the composite structural member is applied to a side sill or B pillar of a vehicle is also disclosed. By using such composite structural members, attempts are being made to reduce the weight of vehicles and improve fuel efficiency, that is, reduce _CO2 emissions. On the other hand, composite structural members applied to the side sills, B-pillars, etc. of these vehicles are desired to have the ability to absorb collision loads.

JP2010-149511

In the above-mentioned composite structural member, if the bond between the metal member and the fiber-reinforced resin member peels off when a load is applied, the load cannot be sufficiently received. Therefore, it is also desired to improve the bonding strength between the metal member and the fiber-reinforced resin member. The inventors did not improve the joint strength at the entire joint surface between the metal member and the fiber-reinforced resin member, but by increasing the joint strength locally, the strength against the load of the T-shaped composite structural member was increased. We have found that it can be effectively improved.

An object of the present invention is to provide a T-shaped composite structural member for a vehicle that can improve the strength against loads.

The T-shaped composite structural member according to the first invention includes a metal member and a fiber-reinforced resin member joined to one surface of the metal member. Reinforcing portions for reinforcing the bond between the metal member and the fiber-reinforced resin member are provided near three ends of the T-shaped composite structural member on the opposite side to the intersection of the pair of elongated portions. Further, the pair of elongated parts are a side sill and a B-pillar, and reinforcing parts are provided near the front and rear ends of the side sill and the upper end of the B-pillar, respectively.
The T-shaped composite structural member according to the second invention includes a metal member and a fiber-reinforced resin member joined to one surface of the metal member. Reinforcing portions for reinforcing the bond between the metal member and the fiber-reinforced resin member are provided near three ends of the T-shaped composite structural member on the opposite side to the intersection of the pair of elongated portions. Further, in the reinforced portion, the degree of crystallinity of the fiber reinforced resin of the fiber reinforced resin member is lower than that in the surrounding area.
A T-shaped composite structural member according to a third aspect of the invention includes a metal member and a fiber-reinforced resin member joined to one surface of the metal member. Reinforcing portions for reinforcing the bond between the metal member and the fiber-reinforced resin member are provided near three ends of the T-shaped composite structural member on the opposite side to the intersection of the pair of elongated portions. Further, in the reinforced portion, the residual stress of the fiber reinforced resin of the fiber reinforced resin member is smaller than that in the surrounding area.

According to the T-shaped composite structural member according to the present invention, strength against loads can be improved.

FIG. 1 is an exploded perspective view of a side panel of a vehicle including a T-shaped composite structural member according to an embodiment. It is a perspective view of the outer panel (composite structure member) of the said side panel. FIG. 3 is a perspective view showing the position of the reinforcing portion (top plate with a hat-shaped cross section) in the composite structural member. FIG. 3 is a perspective view showing the position of a reinforcing portion (a side plate with a hat-shaped cross section) in the composite structural member. It is a sectional view before construction when the above-mentioned reinforcement part is constituted by a rivet. It is a sectional view after construction in the case where the said reinforcement part is formed with a rivet. FIG. 7 is a partially sectional side view when the reinforcing portion is formed by frictional heat welding. FIG. 7 is a partially sectional side view when the reinforcing portion is formed by fastening bolts and nuts.

Hereinafter, a T-shaped composite structural member according to an embodiment will be described with reference to the drawings.

FIG. 1 is an exploded perspective view of a side panel 1 of a vehicle equipped with the composite structural member of this embodiment. Specifically, a T-shaped composite structural member is constituted by a pair of elongated members (namely, the side sill 2 and the B-pillar 3). The side panel 1 is composed of an outer panel 1A and an inner panel 1B. The outer panel 1A is constructed by integrally joining a CFRTP fiber-reinforced resin member 1P to the inner surface of an aluminum metal member 1M located on the outside of the vehicle by outsert molding. FIG. 1 shows a state in which a fiber-reinforced resin member 1P to be outsert-molded is separated from the inner surface of a metal member 1M. Note that fibers other than carbon fibers may be used as reinforcing fibers for FRTP (eg, glass fibers, boron fibers, aramid fibers, etc.).

The fiber reinforced resin member 1P of this embodiment is joined to the inner surface of the metal member 1M by outsert molding. That is, since outsert molding is a type of injection molding, the carbon fibers used in the above-mentioned CFRTP are used as discontinuous fibers. In this embodiment, carbon fibers are not used as continuous fibers as used in autoclave methods or RTM methods, but are used after being cut into a certain length and kneaded with a thermoplastic resin. CFRTP, which is kneaded with carbon fibers as discontinuous fibers, is integrally molded with an aluminum panel to form a composite structural member. The term "insert molding" is generally used when a metal component (metal insert) is embedded in a part of a resin molded product. The term "outsert molding" is used when a part of a metal part is covered with resin as in this embodiment.

Note that during outsert molding of the fiber reinforced resin member 1P, the carbon fibers introduced into the injection molding machine are cut by a screw inside the injection molding machine that feeds the thermoplastic resin to the injection port. The cut carbon fibers are kneaded with thermoplastic resin upstream from the injection port. Since outsert molding is injection molding using a metal mold, the degree of freedom in the shape of the molded resin part (degree of freedom in molding) is high, and ribs can be easily provided in areas where strength and rigidity are required. As shown in FIGS. 1 and 2, many ribs are formed inside the fiber reinforced resin member 1P. Note that the ribs are erected from a liner layer that directly contacts the inner surface of the metal member 1M (the ribs and the liner layer are integrally formed).

The outer side sill 2A of the outer panel 1A is constructed by joining a sill resin portion 2P to the inner surface of an outer sill panel 2M having a hat-shaped cross section (see FIGS. 3A and 3B) by outsert molding. As shown in FIGS. 3A and 3B, the hat-shaped cross section includes a top plate 2U, a pair of side plates 2S extending at an angle (90° in the figure) from both edges of the top plate 2U, and a side plate 2S. It consists of a flange plate 2F extending parallel to the top plate 2U from each tip edge. The sill resin portion 2P is joined to the inner surfaces of the top plate 2U and the side plates 2S. The flange plate 2F is spot welded to both side edges of the inner sill panel 2B of the inner panel 1B, thereby constructing the side sill 2 with a closed cross section. Like the outer side sill 2A, the outer B pillar 3A in the outer panel 1A is also constituted by an outer pillar panel 3M having a hat-shaped cross section, a pillar resin portion 3P, and an inner pillar panel 3B of the inner panel 1B.

When a load (for example, a side collision load) is applied to such a T-shaped composite structural member from the outside of the vehicle on the T-shaped surface, the load is transmitted through the side sill 2 and B-pillar 3. They tend to concentrate at the T-shaped intersection (lower end of B-pillar 3). Then, the intersection of the composite structural member is deformed, and as a result of this deformation, the joint surface between the metal member 1M and the fiber-reinforced resin member 1P peels off. This peeling is thought to be due to the above-mentioned load acting as a shearing force along the joint surface. Then, the peeling at this intersection progresses to the three ends opposite to the intersection (ie, the front and rear ends of the side sill 2 and the upper end of the B-pillar 3). If the metal member 1M and the fiber-reinforced resin member 1P are completely separated, the load cannot be firmly received by the composite structural member. Therefore, in this embodiment, as shown in FIG. 2, reinforcing portions R for reinforcing the bond between the metal member 1M and the fiber-reinforced resin member 1P are provided near the three ends described above in order to prevent the progress of peeling. It is provided.

It should be noted that although a detailed explanation will be given later on how to concretely construct the reinforcing part R that reinforces the joint between the metal member 1M and the fiber reinforced resin member 1P, all the reinforcing parts R in this embodiment are the same. , the increase in joint strength due to one reinforcing portion R is almost the same. In this embodiment, three (more than three) reinforcing portions R are provided near the front end and rear end of the side sill 2, respectively, and two reinforcing portions R are provided near the upper end of the B-pillar 3. ing. Further, these reinforcing portions R are all formed on the top plate having a hat-shaped cross section (see top plate 2U of outer side sill 2A in FIG. 3A).

Therefore, in this embodiment, the bonding strength between the metal member 1M and the fiber-reinforced resin member 1P at the front end and the rear end of the side sill 2 is the same as that of the metal member 1M and the fiber-reinforced resin member 1P at the upper end of the B-pillar 3. The bonding strength is different. By doing so, it is possible to control the direction in which the peeling between the metal member 1M and the fiber-reinforced resin member 1P described above develops. For example, by varying the total bonding strength depending on the number of reinforcing portions R described above, it is possible to control whether delamination occurs first in the 2-side side sill direction or in the B-pillar 3 direction. In addition, regarding the magnitude of the bonding strength, static loads were applied to the above-mentioned joints of the T-shaped composite structural member to intentionally cause the progress of peeling, and the reinforcement part R where the peeling occurred first was It can be determined that the joint strength is low.

As described above, in this embodiment, the bonding strength is made different, and specifically, the bonding strength at the front end and the rear end of the side sill 2 is made higher than the bonding strength at the upper end of the B-pillar 3. In this case, the peeling progresses more easily in the B-pillar 3 direction than in the side sill 2 direction, and it becomes difficult for the peeling to progress along the side sill 2. Therefore, it is possible to prevent the metal member 1M and fiber-reinforced resin member 1P of the side sill 2, which have peeled off and are no longer restrained, from displacing toward the tire and impeding rotation and steering of the tire.

Moreover, the size of the bonding area between the metal member 1M and the fiber-reinforced resin member 1P also influences the total bonding strength. Therefore, the size of the bonding area between the metal member 1M and the fiber-reinforced resin member 1P is determined so that the bonding strength at the front end and rear end of the side sill 2 is higher than the bonding strength at the upper end of the B-pillar 3. The number of reinforcement parts R is set in consideration.

Further, in this embodiment, the reinforcing portions R are all formed on the top plate having the hat-shaped cross section described above (see the top plate 2U of the outer side sill 2A in FIG. 3A). As mentioned above, when a load is applied to the side sill 2 or B-pillar 3 from the outside of the vehicle, the bending stress increases as it moves away from their respective neutral axes (center of gravity in the longitudinal direction), that is, as it approaches the ends. It's to become stronger. Considering the deformation (curving) of the side sill 2 and B-pillar 3 due to the above-mentioned loads, it is effective to provide the reinforcing portion R on the top plate having a hat-shaped cross section.

Note that the reinforcing portion R may be formed on the side plate having a hat-shaped cross section (see the side plate 2S of the outer side sill 2A in FIG. 3B). For example, regarding B-pillar 3, its top plate is a commonly visible surface. Although it depends on how the reinforcement part R is constructed, if the appearance of the reinforcement part R is conspicuous, a beautiful appearance can be achieved by forming the reinforcement part R on the side plate of the B-pillar 3. I can do it. However, in order to improve the joint strength, it may be necessary to install two joints, one on each opposing side panel, when installing the side panels, which can be achieved with a single top panel. . The formation position of the reinforcing portion R may be determined in consideration of the joint strength and appearance.

Next, how each reinforcing portion R is specifically constructed will be explained. Note that, as described above, the reinforcing portion R is for reinforcing the joint between the metal member 1M and the fiber-reinforced resin member 1P, and is constructed between the metal member 1M and the fiber-reinforced resin member 1P.

4A and 4B show the case where the reinforcing portion R is constructed using rivets 4. FIG. FIG. 4A shows a state before the reinforcing part R is formed, and the rivet 4 is formed from a disk-shaped head 4A and a cylindrical leg 4B extending at right angles from the head 4A. Become. A space 4C is formed inside the head 4A and the legs 4B. The inner diameter of the space 4C gradually increases toward the annular tip edge of the leg portion 4B. The reinforcing portion R is formed by driving the rivet 4 into the outer panel 1A from the fiber reinforced resin member 1P side. In addition, the metal member 1M of the outer panel 1A is pre-formed with a through hole 1H that allows the leg portion 4B to communicate with the metal member 1M. Further, a metal washer 12 is arranged between the head 4A and the fiber reinforced resin member 1P to prevent deformation or cracking of the fiber reinforced resin member 1P.

When driving the rivet 4, a jig (die) 5 is placed on the back side of the driving location. The jig 5 has a gentle protrusion 5A corresponding to the space 4C described above, and a gentle annular recess 5B corresponding to the annular tip edge of the leg 4B described above. The annular recess 5B is formed around the protrusion 5A, and the tip of the leg 4B of the driven rivet 4 is expanded in diameter outward by the protrusion 5A and the annular recess 5B, and is connected to the inner peripheral edge of the through hole 1H. engage with. FIG. 4B shows the state after the reinforcement portion R has been formed, and the jig 5 has been removed. In addition, in FIG. 4B, the punched fiber reinforced resin member 1P remains inside the leg portion 4B, but the fiber reinforced resin member 1P inside the leg portion 4B may be removed.

In the formed reinforcing portion R, the fiber reinforced resin member 1P and the metal member 1M are sandwiched between the head 4A (washer 12) of the rivet 4 and the tip of the leg portion 4B with an expanded diameter, so that the fiber reinforced resin member 1P and the metal member Peeling between the 1M and 1M is suppressed. That is, the reinforcing portion R reinforces the bond between the fiber-reinforced resin member 1P and the metal member 1M, and the bonding strength between the two at the reinforcing portion R is increased.

Next, FIG. 5 shows a case where the reinforcing part R is constructed by frictional heat welding. In frictional heat welding, a rotating tool 6 is pressed against the metal member 1M side of the outer panel 1A, and the resin (CFRTP) of the fiber reinforced resin member 1P is softened or melted by the frictional heat. The softened or melted fiber-reinforced resin member 1P comes into close contact with the metal member 1M to form a reinforcing portion R when cooled. When pressing the tool 6 against the outer panel 1A, a jig 7 is placed on the back side of the pressing location. When the rotating tool 6 is pressed against the metal member 1M, frictional heat is transmitted to the fiber-reinforced resin member 1P via the metal member 1M, and the fiber-reinforced resin member 1P is softened or melted. When the rotation of the tool 6 is stopped or the tool 6 is pulled out, the fiber-reinforced resin member 1P hardens, but at this time, it comes into close contact with the metal member 1M, and the fiber-reinforced resin member 1P and the metal member 1M are in close contact with each other. Strength is improved. That is, at this time, the bonding at the interface between the metal member 1M and the fiber-reinforced resin member 1P is strengthened, and the bonding strength is improved.

In addition, in the case of frictional heat bonding, it is preferable that micro-sized or nano-sized fine uneven holes are formed on the joining surface of the metal member 1M and the fiber reinforced resin member 1P. Due to frictional heat bonding, the softened and molten fiber-reinforced resin member 1P enters the inside of the micro-corrugated holes, and strong bonding strength is obtained. Note that the micro-corrugated holes can be formed by, for example, blasting, laser processing, chemical conversion treatment, or the like.

Moreover, at this time, by controlling the crystallinity of the fiber reinforced resin member 1P, that is, the polymer compound, the bonding strength between the metal member 1M and the fiber reinforced resin member 1P can be further improved. If the degree of crystallinity is high, the hardness and rigidity will be high, but the material will become brittle. Therefore, for the fiber-reinforced resin member 1P, the degree of crystallinity in the reinforcing portion R is lowered than that in the surrounding area to make it easier to stretch, and to prevent peeling by being sticky against peeling. Specifically, the degree of crystallinity can be lowered by rapidly cooling the fiber-reinforced resin member 1P instead of slowly cooling it. The fiber-reinforced resin member 1P during frictional heat welding is partially melted, and heat is easily diffused, resulting in rapid cooling. Note that the degree of crystallinity can be measured (calculated) by a known method using X-ray diffraction.

Here, the crystallinity control was performed together with frictional heat welding, but it is also possible to form the reinforcing portion R only by controlling the crystallinity degree. For example, immediately after outsert-molding the fiber-reinforced resin member 1P on the inner surface of the metal member 1M, the reinforcing portion R may be formed by partially rapidly cooling the fiber-reinforced resin member 1P. The portion of the fiber reinforced resin member 1P other than the reinforcing portion R is slowly cooled. Partial quenching can be performed by opening the mold for outsert molding and injecting air into the portion where the reinforcing portion R is to be formed. Alternatively, the reinforcing portion R may be formed when the fiber-reinforced resin member 1P is cooled within the mold by controlling the shape of the cooling channel formed within the mold and the flow rate of cooling water.

Alternatively, the reinforcing portion R may be formed by outsert-molding the fiber-reinforced resin member 1P on the inner surface of the metal member 1M and then controlling the degree of crystallinity in a separate process. For example, the reinforcing portion R may be formed by partially remelting the outsert-molded fiber-reinforced resin member 1P by laser heating or ultrasonic heating and rapidly cooling it. As mentioned above, partial melting results in rapid cooling because heat is easily diffused. Furthermore, in the case of remelting (including frictional heat welding), the energy of phase change during solidification is smaller than during outsert molding, so rapid cooling is also required from this point of view.

In addition, also when performing the above-mentioned crystallinity control, it is preferable that micro-sized or nano-sized fine uneven holes are formed on the joint surface of the metal member 1M with the fiber-reinforced resin member 1P. By controlling the crystallinity, the degree of crystallinity of the fiber-reinforced resin member 1P in the vicinity of the micro-asperity hole is made lower than the crystallinity of the surrounding area, and the fiber-reinforced resin member 1P can be easily stretched in the vicinity of the micro-asperity hole. As a result, the fiber-reinforced resin member 1P is entangled in the fine uneven holes and sticky against peeling, thereby suppressing peeling and providing stronger bonding strength. Note that the micro-corrugated holes can be formed by, for example, blasting, laser processing, chemical conversion treatment, or the like.

Next, FIG. 6 shows a case where the reinforcing part R is constructed by fastening bolts 8 and nuts 9. A bolt hole 11 is formed in the outer panel 1A, and a reinforcing portion R is formed by fastening a bolt 8 and a nut 9 to the bolt hole 11. The bolt holes 11 may be bored after outsert molding of the fiber-reinforced resin member 1P onto the inner surface of the metal member 1M, or may be formed by outsert-molding the fiber-reinforced resin member 1P into the metal member 1M that has been drilled in advance. . In this case, the fiber reinforced resin member 1P may be outsert molded so as to leave the hole in the metal member 1M, or after the outsert molding, the hole portion of the metal member 1M that was blocked by the fiber reinforced resin member 1P may be re-molded. May be perforated.

In the reinforced portion R formed in this way, the head of the bolt 8 and the nut prevent the fiber reinforced resin member 1P and the metal member 1M from coming apart. That is, the reinforcing portion R reinforces the bond between the fiber-reinforced resin member 1P and the metal member 1M, and the bonding strength between the two at the reinforcing portion R is increased. Further, in this embodiment, the washer 10 is arranged only on the metal member 1M side, but the washer 10 may also be arranged on the fiber reinforced resin member 1P side. Alternatively, the washer 10 may be disposed only on the fiber-reinforced resin member 1P side. Furthermore, the nut 9 may be a weld nut welded to the metal member 1M in advance. Alternatively, the head of the bolt 8 may be welded to the metal member 1M in advance to form a weld bolt, and the bolt may be fastened with a nut 9 from the fiber reinforced resin member 1P side.

It has already been explained that the reinforcing portion R is formed by controlling the crystallinity of the fiber-reinforced resin member 1P. Similarly, the reinforcing portion R can also be formed by controlling the residual stress of the fiber-reinforced resin member 1P. Fracture due to separation of the fiber-reinforced resin member 1P from the metal member 1M occurs when the sum of the load and residual stress exceeds the interfacial bonding force. Therefore, by reducing residual stress, bonding strength can be improved. For example, the residual stress at the interface between the metal member 1M and the fiber-reinforced resin member 1P can be obtained from the following equation. (Average residual stress at interface) = (difference in thermal expansion force) × (difference in temperature) × (modulus of elasticity) = (100-23) [Resin-aluminum: ppm/°C] × (120-20) [Mold Temperature - Room temperature: °C] × 4 [Resin elastic modulus: GPa] = 31 [MPa]

When the interfacial bonding force is 40 MPa and the residual stress is 31 MPa as described above, peeling and breakage occur at a load of 9 MPa. By further reducing the residual stress of 31 MPa, the strength against loads can be improved. Specifically, the reinforcing portion R is formed by reducing the residual stress by locally performing heat treatment called so-called annealing treatment or aging treatment (the laser heating and ultrasonic heating methods described above correspond to this). be able to. Note that residual stress can also be measured (calculated) by a known method using X-ray diffraction.

According to the present embodiment, metal is placed near the three ends on the opposite side to the intersection of a pair of long parts of the T-shaped composite structure member formed by the metal member 1M and the fiber-reinforced resin member 1P. Reinforcing portions R for reinforcing the bond between the member 1M and the fiber-reinforced resin member 1P are each provided. Therefore, by forming reinforcing portions R that locally increase the joint strength between the metal member 1M and the fiber-reinforced resin member 1P near the three ends described above, the strength against the load of the T-shaped composite structural member can be effectively increased. can be improved.

Further, in this embodiment, the above-mentioned pair of elongated parts are the side sill 2 and the B-pillar 3, and reinforcement parts R are provided near the front and rear ends of the side sill 2 and the upper end of the B-pillar 3, respectively. It is being The intersection of the above-mentioned pair of long parts (side sill 2 and B-pillar 3) is the lower end of the B-pillar 3, and the metal member 1M and the fiber-reinforced resin member 1P at the side sill 2 and B-pillar 3 are resistant to side collision loads. Peeling can be effectively suppressed. As a result, the side collision resistance of the vehicle can be improved.

Here, in the present embodiment, the reinforcing portion R increases the bonding strength between the metal member 1M and the fiber reinforced resin member 1P at the front and rear ends of the side sill 2 compared to the metal member 1M at the upper end of the B-pillar 3. The bonding strength with the fiber-reinforced resin member 1P is different. Thereby, the direction in which the peeling between the metal member 1M and the fiber-reinforced resin member 1P progresses can be controlled.

Specifically, in the present embodiment, the bonding strength between the metal member 1M and the fiber reinforced resin member 1P at the front end and the rear end of the side sill 2 is the same as that of the metal member 1M and the fiber reinforced resin member at the upper end of the B pillar 3. The bonding strength is made higher than the bonding strength with the member 1P. In this case, peeling is more likely to develop in the B-pillar 3 direction than in the side sill 2 direction, and peeling is less likely to develop along the side sill 2. Therefore, it is possible to prevent the metal member 1M and the fiber-reinforced resin member 1P, which have peeled off and are no longer restrained, from displacing toward the tire and inhibiting the rotation and steering of the tire.

Here, in this embodiment, the side sill 2 and the B-pillar 3 are constituted by the above-mentioned metal member 1M having a hat-shaped cross section and a fiber-reinforced resin member 1P joined to the inner surface of the hat-shaped cross section. When a load is applied to the side sill 2 or the B-pillar 3 from the outside of the vehicle, the bending stress becomes stronger as it moves away from their respective neutral axes (center center of gravity in the longitudinal direction) (that is, as it approaches the ends). Therefore, considering the deformation (curving) of the side sill 2 and B-pillar 3 due to the above-mentioned loads, the bending stress can be effectively resisted if the reinforcing portion R is formed on the top plate (2U) having a hat-shaped cross section.

On the other hand, the reinforcing portion R may be formed on the side plate (2S) having a hat-shaped cross section. As for B-pillar 3, its top plate is the most visible surface. By forming the reinforcing portion R on the side plate, it is possible to prevent the reinforcing portion R from making the appearance conspicuous, and a beautiful appearance can be achieved.

Moreover, in this embodiment, the crystallinity degree of the fiber reinforced resin of the fiber reinforced resin member 1P in the reinforcing portion R is lower than that of the surrounding area. By making the crystallinity of the reinforcing portion R lower than that of the surrounding area, the fiber-reinforced resin member 1P becomes resistant to peeling, so that peeling can be effectively suppressed.

The residual stress of the fiber-reinforced resin of the fiber-reinforced resin member 1P in the reinforcing portion R may be lower than that of the surrounding area. Also in this case, by making the residual stress lower than the surroundings, the fiber-reinforced resin member 1P becomes difficult to peel off, and peeling can be effectively suppressed.

The invention is not limited to the embodiments described above. For example, in the above embodiment, in order to make the joint strength at the upper end of the B-pillar 3 different from each joint strength near the front/rear end of the side sill 2, the number of reinforcing parts R having the same structure is changed. However, the bonding strength may be made different by providing a reinforcing portion R having a different structure. Further, although the fiber reinforced resin member 1P of the above embodiment uses a thermoplastic resin, the fiber reinforced resin member may be formed of a thermosetting resin. In this case, the surface of the fiber-reinforced resin member can be joined to the surface of the metal member by various methods (for example, using an adhesive).

1M Metal member 1P Fiber reinforced resin member 2 Side sill (long material)
2U (Hat-shaped cross-section) Top plate 2S (Hat-shaped cross-section) Side plate 2F (Hat-shaped cross-section) Flange plate 3 B-pillar (long material)
R Reinforcement part

Claims (7)

In a T-shaped composite structural member of a vehicle,
A T-shaped metal member,
a T-shaped fiber reinforced resin member joined to one surface of the metal member,
The metal member and the fiber-reinforced resin are placed in the vicinity of three ends on the opposite side to the intersection of a pair of long parts of the T-shaped composite structure member formed by the metal member and the fiber-reinforced resin. Each piece is equipped with a reinforcement part that strengthens the connection with the other parts.
The pair of elongated parts are a side sill and a B pillar,
A T-shaped composite structural member , wherein the reinforcing portions are provided near the front and rear ends of the side sill and the upper end of the B-pillar, respectively . The reinforcing portion increases the bond strength between the metal member and the fiber-reinforced resin member at the front end and the rear end of the side sill, and the strength of the joint between the metal member and the fiber-reinforced resin member at the upper end of the B-pillar. 2. The T-shaped composite structural member according to claim 1 , wherein the T-shaped composite structural member has a bonding strength different from that of the T-shaped composite structural member. Each bonding strength between the metal member and the fiber-reinforced resin member at the front end and the rear end of the side sill is greater than the bonding strength between the metal member and the fiber-reinforced resin member at the upper end of the B-pillar. 3. The T-shaped composite structural member according to claim 2 , characterized in that the T-shaped composite structural member is also high. The side sill and the B pillar each include a top plate, a pair of side plates extending at an angle from both edges of the top plate, and a flange extending parallel to the top plate from the tip edge of each of the side plates. the metal member having a hat-shaped cross section consisting of a plate; and the fiber-reinforced resin member joined to the inner surface of the hat-shaped cross section of the metal member,
The T-shaped composite structural member according to claim 1 , wherein the reinforcing portion is formed on the top plate. The side sill and the B pillar each include a top plate, a pair of side plates extending at an angle from both edges of the top plate, and a flange extending parallel to the top plate from the tip edge of each of the side plates. the metal member having a hat-shaped cross section consisting of a plate; and the fiber-reinforced resin member joined to the inner surface of the hat-shaped cross section of the metal member,
The T-shaped composite structural member according to claim 1 , wherein the reinforcing portion is formed on the side plate. In a T-shaped composite structural member of a vehicle,
A T-shaped metal member,
a T-shaped fiber reinforced resin member joined to one surface of the metal member,
The metal member and the fiber-reinforced resin are placed in the vicinity of three ends on the opposite side to the intersection of a pair of long parts of the T-shaped composite structure member formed by the metal member and the fiber-reinforced resin. Each piece is equipped with a reinforcement part that strengthens the connection with the other parts.
A T-shaped composite structural member, wherein in the reinforcing portion, the crystallinity of the fiber reinforced resin of the fiber reinforced resin member is lower than that of the surrounding area. In a T-shaped composite structural member of a vehicle,
A T-shaped metal member,
a T-shaped fiber reinforced resin member joined to one surface of the metal member,
The metal member and the fiber-reinforced resin are placed in the vicinity of three ends on the opposite side to the intersection of a pair of long parts of the T-shaped composite structure member formed by the metal member and the fiber-reinforced resin. Each piece is equipped with a reinforcement part that strengthens the connection with the other parts.
A T-shaped composite structural member, wherein in the reinforcing portion, the residual stress of the fiber-reinforced resin of the fiber-reinforced resin member is smaller than that of the surrounding area.

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