CN206579209U - A kind of enhanced type composite material foam core cylinder - Google Patents

Abstract

The utility model discloses a reinforced composite material foam sandwich tube, which comprises a composite material outer skin, a composite material inner skin, and a cylindrical core layer arranged between the two, and the inner and outer sides of the core layer are Several grooves are evenly engraved on the surface, and composite material ribs are installed in the grooves, and the grooves and composite material ribs are arranged along the axial direction of the core layer; To solve the problems of debonding and local buckling of the panel, a reinforced composite foam sandwich tube that can greatly improve the load-bearing efficiency of the composite material sandwich tube without significantly increasing the self-weight of the structure is provided.

Description

A reinforced composite foam sandwich tube

technical field

The utility model belongs to the technical field of fiber-reinforced resin-based composite materials, and relates to a tube/column structure with foam as the sandwich layer in a sandwich structure of fiber-reinforced resin-based composite materials, in particular to a reinforced composite material foam sandwich cylinder.

Background technique

Emergency support components in the engineering field are generally made of metal materials, which are heavy and inconvenient for manual handling and operation. Fiber-reinforced resin-based composite materials have the characteristics of light weight, high strength, and corrosion resistance. The composite material sandwich structure formed by using it as a skin, and then separating the two skins with a core layer with low density and large thickness has The unique advantages of high bending rigidity, as well as functional characteristics such as energy absorption and heat insulation, make it widely used in many fields.

Compared with many composite sandwich structures, the foam sandwich structure has the advantages of simple preparation process and low cost, and is suitable for popularization and use in the field of civil engineering. The composite foam sandwich tube can be prepared as a supporting column and used in the field of civil engineering emergency rescue. Under the action of axial load, due to the low stiffness of the foam material, the support ability of the composite skin is weak, and the composite skin is prone to local buckling, and the surface-core bonding strength of the foam sandwich structure is generally weak, which is easy Core debonding occurs. These two defects lead to low load-bearing efficiency of the composite foam sandwich tube, which cannot meet the requirements of large load. Moreover, the current preparation process of composite foam sandwich tubes is mainly based on hand lay-up process, which can only produce small-sized components, and the performance is unstable and the operation is complicated.

Utility model content

The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide a reinforced composite foam sandwich tube and its preparation method. To solve the problem of local buckling, provide a reinforced composite foam sandwich tube that greatly improves the load-bearing efficiency of the composite material sandwich tube without significantly increasing the self-weight of the structure. At the same time, it provides a simple operation, low cost, and high performance. A method for preparing a stable reinforced composite foam sandwich tube.

In order to solve the above technical problems, the utility model provides a reinforced composite material foam sandwich tube, which includes a composite material outer skin, a composite material inner skin, and a cylindrical core layer arranged between the two. A plurality of grooves are evenly distributed on the inner and outer surfaces, and composite material ribs are installed in the grooves, and the grooves and the composite material ribs are arranged along the axial direction of the core layer.

The technical scheme that the utility model is further limited is:

The aforementioned core layer is made of foam material, and the core layer is formed by splicing at least three foam circular arc sheets in a circumferential direction.

Both the composite material outer skin and the composite material inner skin are composed of fiber-reinforced resin-based composite materials, and the fiber-reinforced resin-based composite materials include the first reinforcing material and resin. The first reinforcing material includes one or more of glass fiber biaxial cloth, glass fiber multiaxial cloth, carbon fiber biaxial cloth, carbon fiber multiaxial cloth, basalt fiber cloth and aramid fiber cloth.

The aforementioned composite ribs are made of unidirectional fiber-reinforced resin-based composite material, and the unidirectional fiber-reinforced resin-based composite material includes a second reinforcing material and resin. The second reinforcing material includes one or more of unidirectional glass fiber cloth, glass fiber yarn, unidirectional carbon fiber cloth, carbon fiber wire, unidirectional basalt fiber cloth, basalt fiber wire, unidirectional aramid fiber cloth and aramid fiber wire kind.

The aforementioned resins include one or more of epoxy resins, vinyl resins, phenolic resins and polyurethane resins.

The aforementioned foam circular arc sheet is PVC foam, PMI foam, PU foam or PEI foam.

The composite material outer skin and the composite material inner skin have the same thickness, the circumferential width of the composite rib is slightly smaller than the width of the groove, and its radial width is the same as the depth of the groove.

The inner radius of the reinforced composite foam sandwich tube is 100-500mm; the height of the reinforced composite foam sandwich tube is 1000-4000mm; the thickness of the composite material inner skin is the same as that of the composite material outer skin, and the thickness is 10-20mm The thickness of the foam arc sheet is 10-60mm; the width of the groove is 4-20mm, and the depth is 2-10mm; the circumferential width of the composite rib is 1mm smaller than the groove, and the radial width is the same as the groove depth.

In this application, the size and material of the composite material inner skin, composite material outer skin, foam circular arc sheet, and ribs can be selected and designed according to actual requirements.

further,

The utility model also provides a method for preparing a reinforced composite material foam sandwich tube, which includes the following specific steps:

(1) Prepare the foam arc sheet: groove the inner and outer surfaces of the foam arc sheet in advance for placing composite ribs;

(2) Reinforcement: Arrange unidirectional fiber cloth directly in the grooves on the inner and outer surfaces of the foam arc, or arrange cured fiber-reinforced resin-based composite ribs in the grooves on the inner and outer surfaces of the foam arc ;

(3) Prepare the preform: first apply the release agent on the reinforced composite foam sandwich mold, and then wrap the reinforcing material of the inner skin, the reinforced cylindrical core layer, and the reinforcement of the outer skin on the mold in turn material, to obtain a preform;

(iv) Assembling the VARI molding system: on the preform obtained in step (iii), wind the release cloth and the flow guide net successively, and arrange the resin guide pipe and the exhaust pipe, and then put the above preform, release cloth and flow guide net Seal with vacuum bags, and arrange resin diversion tubes and exhaust tubes to wrap and cover to form a sealed environment;

(5) Glue injection and co-curing: vacuumize, check that the airtightness is intact, pour the prepared resin, and cure and shape.

(vi) Post-processing: Take out the mold from the cured molding by pushing the method, and remove the vacuum bag, diversion tube, diversion net, and release cloth on the molding to obtain a reinforced composite material foam Sandwich.

The beneficial effects of the utility model are:

The utility model introduces composite material ribs between the inner and outer skins of the composite material and the surface of the foam circular arc sheet, and the ribs of the composite material are bonded and solidified with the inner and outer skins of the composite material and PVC foam to form an organic On the whole, the ribs of the composite material can be used as reinforcing ribs of the inner and outer skins of the composite material, which can effectively prevent local buckling of the inner and outer skins of the composite material, and more effectively exert the strength of the skin of the composite material.

In addition, grooves are engraved on the surface of the foam arc sheet, and the circumferential width of the groove is 1mm larger than the width of the composite material ribs. The vacant gap in the groove can be used as a channel for resin flow in VARTM molding, making the resin more uniform The infiltration reinforcement material ensures the integrity of the surface and the core, thereby improving the strength of the surface and the core; at the same time, the composite material ribs in the groove are embedded in the foam arc sheet to form a mechanical engagement with it, making the skin It is more closely connected with the foam arc sheet; therefore, after introducing the composite material ribs, it can endow the reinforced composite foam sandwich tube with high surface and core bonding strength. In addition, the composite material ribs themselves have the characteristics of high strength ratio and high stiffness ratio, and the arrangement direction is consistent with the direction of the force. Therefore, the composite material ribs themselves can effectively share the external load and play a role in lifting the reinforced foam sandwich tube. Overall carrying capacity effect.

In the preparation method provided by the utility model, the vacuum-assisted resin infusion technology is adopted to make the skin of the composite material and the ribs of the composite material evenly infiltrated with resin, and at the same time, the curing pressure of the molded parts is uniform, which ensures that the components are closely bonded. The face-core bonding effect of the type composite material foam sandwich cylinder is good without obvious defects, and the preparation method is low in cost and easy to operate.

The enhanced composite material foam sandwich tube designed by the utility model introduces composite material ribs between the composite material skin and the core layer, which can effectively overcome the problems of local buckling of the composite material panel and debonding of the surface core, and can better The advantages of high strength of composite materials are fully utilized to achieve the effect of improving the load-bearing efficiency, thereby meeting the requirements of large load-bearing and expanding its application range. Simultaneously, the preparation method in the utility model is easy to operate, low in cost, and the performance of the prepared finished product is stable.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Wherein, 1-outer skin of composite material, 2-inner skin of composite material, 3-rib of composite material, 4-core layer, 5-groove.

detailed description

Example 1

This embodiment provides a reinforced composite foam sandwich tube, the structure of which is shown in Figure 1, comprising a composite material outer skin 1, a composite material inner skin 2, and a cylindrical core layer 4 arranged between the two , a number of grooves 5 are evenly distributed on the inner and outer surfaces of the core layer 4, and the composite material ribs 3 are installed in the grooves 5, and the grooves 5 and the composite material ribs 3 are along the axial direction of the core layer 4 set up.

The aforementioned core layer 4 is made of foam material, and the core layer 4 is formed by circumferentially splicing four foam circular arc pieces with a central angle of 90°. Both the composite material outer skin 1 and the composite material inner skin 2 are composed of fiber-reinforced resin-based composite materials, and the fiber-reinforced resin-based composite materials include the first reinforcing material and resin. The first reinforcing material includes one or more of glass fiber biaxial cloth, glass fiber multiaxial cloth, carbon fiber biaxial cloth, carbon fiber multiaxial cloth, basalt fiber cloth and aramid fiber cloth.

The aforementioned composite rib 3 is made of unidirectional fiber-reinforced resin-based composite material, and the unidirectional fiber-reinforced resin-based composite material includes a second reinforcing material and resin. The second reinforcing material includes one or more of unidirectional glass fiber cloth, glass fiber yarn, unidirectional carbon fiber cloth, carbon fiber wire, unidirectional basalt fiber cloth, basalt fiber wire, unidirectional aramid fiber cloth and aramid fiber wire kind.

The aforementioned resins include one or more of epoxy resins, phenolic resins and polyurethane resins. The aforementioned foam materials include PVC foam, PMI foam, PU foam or PEI foam. The composite material outer skin 1 and the composite material inner skin 2 have the same thickness, the circumferential width of the composite rib 3 is slightly smaller than the width of the groove 5 , and its radial width is the same as the depth of the groove 5 . The inner radius of the reinforced composite foam sandwich tube is 100-500mm; the height of the reinforced composite foam sandwich tube is 1000-4000mm; the thickness of the composite material inner skin is the same as that of the composite material outer skin, and the thickness is 1-5mm The thickness of the foam arc sheet is 10-60mm; the width of the groove is 4-20mm, and the depth is 2-10mm; the circumferential width of the composite rib is 1mm smaller than the groove, and the radial width is the same as the groove depth.

In this embodiment, composite ribs are introduced between the inner and outer skins of the composite material and the surface of the foam arc sheet, and the ribs of the composite material are bonded and solidified with the inner and outer skins of the composite material and PVC foam to form an organic On the whole, the ribs of the composite material can be used as reinforcing ribs of the inner and outer skins of the composite material, which can effectively prevent local buckling of the inner and outer skins of the composite material, and more effectively exert the strength of the skin of the composite material.

In addition, grooves are engraved on the surface of the foam arc sheet, and the circumferential width of the groove is 1mm larger than the width of the composite material ribs. The vacant gap in the groove can be used as a channel for resin flow in VARI molding, making the resin more uniform The infiltration reinforcement material ensures the integrity of the surface and the core, thereby improving the strength of the surface and the core; at the same time, the composite material ribs in the groove are embedded in the foam arc sheet to form a mechanical engagement with it, making the skin It is more closely connected with the foam arc sheet; therefore, after introducing the composite material ribs, it can endow the reinforced composite foam sandwich tube with high surface and core bonding strength. In addition, the composite material ribs themselves have the characteristics of high strength ratio and high stiffness ratio, and the arrangement direction is consistent with the direction of the force. Therefore, the composite material ribs themselves can effectively share the external load and play a role in lifting the reinforced foam sandwich tube. Overall carrying capacity effect.

Example 2

This embodiment provides a method for preparing a reinforced composite foam sandwich tube, which consists of a composite material inner skin, a composite material outer skin, a foam core layer sandwiched between two skins, the core layer and the two skins Composed of composite material ribs between them; the height of the reinforced composite foam sandwich tube is 1000mm, and the inner diameter is 200mm; the composite material inner skin and composite material outer skin are made of glass fiber biaxial cloth reinforced resin matrix composite material Composition, the thickness is 3mm; the core layer is spliced by four foam circular arc sheets with a central angle of 90°, and the foam circular arc sheet material is PVC foam with a density of 100kg/m ³ and a thickness of 40mm; The width of the groove is 7mm, the depth is 4mm, and the interval between the two grooves is 12°; the composite rib is composed of glass fiber unidirectional cloth reinforced resin-based composite material, with a width of 6mm and a thickness of 4mm.

Including the following specific steps:

(1) Preparing PVC foam arcs: The PVC foam arcs with grooves are provided by Beijing Colas Co., Ltd., with a density of 100kg/m ³ and a thickness of 40mm; the width of the groove is 7mm, and the depth is 5mm. The grooves are spaced at 12°, and the foam circular arc sheet is dried in an oven at 50°C in a ventilated environment for 4 hours, and then set aside.

(2) Reinforcement: Use a cloth cutting machine to cut the glass fiber unidirectional cloth into multiple narrow cloth strips with a length of 1000mm and a width of 6mm. The thickness of a single layer of glass fiber unidirectional cloth is 0.4mm. Layers are laid in the grooves, and each groove is laid with 10 layers; or: a flat plate with a length of 1000mm, a width of 1000mm, and a thickness of 4mm is made of unidirectional glass fiber cloth and resin through a molding process, and the flat plate shown is cut into a length of 1000mm , a rib with a width of 6 mm and a thickness of 4 mm, and then place the rib in the groove.

(3) Prepare the preform: apply a release agent on the metal hollow mold cylinder with an outer diameter of 200mm, wind five layers of glass fiber bidirectional cloth with a width of 1000mm and a thickness of 0.6mm on the mold, bind it with fiber filaments, and then buckle it The 4 PVC foam circular arc sheets after reinforcement are bound and fixed with fiber filaments, and finally wrapped with 5 layers of glass fiber bidirectional cloth with a width of 1000 mm and a thickness of 0.6 mm, and are also bound with fiber filaments to obtain a preform;

(iv) Assembling the VARI molding system: on the preform, wrap a layer of release cloth and guide net in sequence, and arrange resin guide tubes, glue injection nozzles, and exhaust tubes, and then wrap them with vacuum bags to form a sealed environment;

(v) Glue injection and co-curing: Check the airtightness of the VARI molding system and adjust it in time; the resin is selected from 770V vinyl resin at room temperature, and the curing agent and coagulant are prepared according to the weight ratio of 100:1:1; The air pipe is connected to the vacuum pump, the injection nozzle is connected to the injection tube and the injection tube is inserted into the resin system, the vacuum pump is turned on, and the resin system is evenly distributed on each part of the preform through the injection tube, guide tube and guide cloth under negative pressure. For corners, turn off the vacuum pump after about 45 minutes, and cure at room temperature for 7 hours.

(vi) Post-processing: Take out the mold from the cured molded body by pushing the push method, and remove the vacuum bag, diversion tube, diversion net, and release cloth on the molded body to obtain a reinforced composite foam clip Core barrel.

In the preparation method provided in this example, the vacuum-assisted resin infusion technology is used to make the composite material skin and the composite material ribs evenly infiltrated with resin, and at the same time, the curing pressure of the molded parts is uniform, which ensures that the components are closely bonded. Therefore, the reinforced The face-core bonding effect of the type composite material foam sandwich cylinder is good without obvious defects, and the preparation method is low in cost and easy to operate.

The above embodiments are only to illustrate the technical ideas of the utility model, and cannot limit the protection scope of the utility model with this. Any changes made on the basis of the technical solutions according to the technical ideas proposed by the utility model all fall into the scope of the utility model. within the scope of the new protection.

Claims (6)

1. a reinforced composite material foam sandwich tube is characterized in that it comprises a composite material outer skin (1), a composite material inner skin (2), and a cylindrical core layer (4) arranged between the two ), several grooves (5) are evenly distributed on the inner and outer surfaces of the core layer (4), and composite material ribs (3) are installed in the grooves (5), and the grooves (5) ) and composite ribs (3) are arranged along the axial direction of the core layer. 2. The reinforced composite material foam sandwich tube according to claim 1, characterized in that, the core layer (4) is made of foam material, and the cylindrical core layer (4) is made of at least three foam circles The arcs are spliced in a circular direction. 3. The reinforced composite material foam sandwich tube according to claim 1, characterized in that, both the composite material outer skin (1) and the composite material inner skin (2) are composed of fiber-reinforced resin-based composite materials. 4. The reinforced composite material foam sandwich tube according to claim 1, characterized in that, the composite material ribs (3) are made of unidirectional fiber-reinforced resin-based composite materials. 5. The reinforced composite material foam sandwich tube according to claim 2, characterized in that, the foam arc sheet is PVC foam, PMI foam, PU foam or PEI foam. 6. The reinforced composite material foam sandwich tube according to claim 1, characterized in that, the thickness of the outer skin of the composite material (1) and the inner skin of the composite material (2) is the same, and the ribs of the composite material ( 3) The circumferential width is smaller than the width of the groove (5), and its radial width is the same as the depth of the groove (5).