Method to increase the interfacial bond strength between metal joint fittings and PMC pipe in carbon fiber composite shafts

Abstract

The invention relates to a method for producing carbon fiber reinforced tubular pipe with a polymer matrix, and for bonding metal parts to both ends of the pipe to increase durability and provide long-term performance and safety advantages.

Description

[0001] METHOD TO INCREASE THE INTERFACIAL BOND STRENGTH BETWEEN METAL JOINT FITTINGS AND PMC PIPE IN CARBON FIBER COMPOSITE SHAFTS

[0002] Technical Area

[0003] The invention relates to a method for producing a polymer matrix carbon fiber reinforced (PMC) tubular tube and for bonding metal parts to both ends of the tube to increase durability and provide long-term performance and safety advantages.

[0004] Prior Art

[0005] Metal joint fittings, that is, steel shafts, are used in land vehicles in the defense industry, automotive industry, renewable energy sources such as wind turbines, maritime industry and many other fields. Although it looks robust and reliable, it has a high weight. In traditional methods, shaft production is carried out with various methods, but it is not long-lasting. Guniimuzde yurt di§inda iiretilen bu uriiniin mafsal baglanti noktalanndaki baglanti partial an, polimer matrisli karbon fiber takviyeli kompozit boruya yapi§tirma i§lemi sonrasi, delaminasyon, yerinden Qikma gibi hasarlann olu§masi ile §aft kullamlmaz hale gelmektedir.

[0006] Today, steel shafts, which are used especially in the defense industry, provide disadvantages in terms of weight.

[0007] In document US2016221275A1, a method developed by compressing and printing with epoxy resin to obtain polyimide film composite materials is mentioned.

[0008] In document US5567535A, a method for reinforcing and strengthening carbon materials with a metal adhesive such as epoxy is described. In document US6217809B1, the method of gluing and pressing tubular cable ends with adhesive is mentioned.

[0009] In document US2012321888A1, a method of bonding and curing fibers from carbon fiber material with epoxy is mentioned.

[0010] In document CN108699322A, a method for lightening the body reinforced with epoxy resin is mentioned.

[0011] In WO2019182535 A2, a method for achieving high strength of composite structures by doping with resin is mentioned.

[0012] In Khater et al. (2023) (Khater, A. Z., Saadi, M. A. S. R., Bhattacharyya, S., Kutana, A., Tripathi, M., Kamble, M., ... & Rahman, M. M. (2023). Processing dynamics of carbon nanotube-epoxy nanocomposites during 3D printing. Cell Reports Physical Science, 4(10).) describes various composites, including the combined use of carbon nanotubes and aerosil in epoxy.

[0013] As a result of the review of the studies in the state of the art, there was a need to develop a method to increase the interfacial bond strength between metal joint fittings and PMC pipe in carbon fiber composite shafts.

[0014] The Objects of the Invention

[0015] The object of the present invention is to develop a method for producing carbon fiber reinforced tubular pipe with a polymer matrix and for bonding metal parts to both ends of the pipe to increase durability and provide long-term performance and safety advantages.

[0016] Another object of the invention is the development of a method for increasing the interfacial bond strength between metal joint fittings and PMC pipe in carbon fiber composite shafts in order to lighten the structure to be formed by the carbon fiber shaft (metal part) produced by the new bonding method up to 75%. The invention makes the bonding process more robust and can be used in many areas, especially in the defense industry, as the safety coefficient for damage is increased. In harsh terrain or in wartime, the loading capacity of defense vehicles is of great importance. Increasing the loading capacity of important equipment, tools and equipment such as ammunition, rations and fuel is of great importance for the defense of the country. With the new bonding method, strength and durability have increased.

[0017] Detailed Description of the Invention

[0018] The method for improving the interfacial adhesion strength to achieve the object of the present invention is shown in the accompanying figures.

[0019] These figures;

[0020] Figure 1: Schematic view of the combination of the inventive carbon fiber reinforced pipe and metal part.

[0021] Figure 2: Perspective view of the inventive metal part.

[0022] Figure 3: Perspective view of the inventive metal part.

[0023] Figure 4: Sectional view of the joint of the inventive carbon fiber reinforced pipe and metal part.

[0024] The parts in the figure are numbered one by one and the corresponding numbers are given below.

[0025] 1. Metal part

[0026] 2. Carbon fiber reinforced pipe

[0027] 3. Sandblasted metal surface

[0028] 4. Adhesive inner surface spreading hole

[0029] 5. Adhesive squeeze hole

[0030] 6. Connection shaft slot 7. Spreading surface

[0031] 8. Conical entry surface of the metal part

[0032] 9. Indentation reference

[0033] 10. Exit hole for overflowing adhesive to the outer surface

[0034] 11. Adhesive filling chamber

[0035] The method for increasing the adhesion strength comprising these following steps, providing a carbon fiber reinforced pipe (2) manufactured by filament winding, providing a metal part (1) to be bonded to the carbon fiber reinforced pipe (2), opening at least one adhesive squeeze hole (5) from the outer surface to the interface of the metal part (1), opening at least one adhesive inner surface spreading hole (4) for the adhesive to enter the inner surface, forming the sandblasted metal surface (3) by increasing the surface area and roughness of the metal part (1) with sandblasting of the metal part (1), inserting the metal part (1) through a conical entry surface of the metal part (8) where it enters the carbon fiber reinforced pipe (2), pressing the metal part (1) into the carbon fiber reinforced pipe (2) up to the indentation reference (9), squeezing epoxy adhesive containing carbon nanotube and aerosil through the adhesive squeeze hole (5), settling the squeezed adhesive in an adhesive filling chamber (11) between the carbon fiber reinforced pipe (2) and the metal part (1), by passing through the adhesive inner surface spreading hole (4) and spreading on an interfacial spreading surface (7), ensuring the adhesive to overflow from the exit hole for overflowing adhesive to the outer surface (10), which is the point where the squeezed adhesive exits from the inside to the outside, to understand that the adhesive has reached sufficient fullness,

[0036] - bonding the sandblasted metal surface (3) with the surfaces of the filament wound carbon fiber reinforced pipe (2) by waiting for the appropriate curing time, ensuring its use by assembling at least one connection shaft slot (6), to which a connection shaft is attached, according to the area to be used.

[0037] In order to squeeze the epoxy-containing resin from the upper surface of the metal part, a channel is opened from the outer surface of the part to the interface by metal processing method. In addition to the channel opened, an adhesive inner surface spreading hole (4) is opened to spread the adhesive. Afterwards, the metal surface of the metal part (1) to be attached to the carbon fiber reinforced pipe (2) will be subjected to sandblasting process. In this way, the metal surface is increased and mechanical bonding is increased. After the sandblasting process, the carbon fiber reinforced pipe (2) and the metal part (1) are combined and the tight fitting process is performed with the help of a press. After the pressing process, epoxy will be injected through the injection channel opened before the assembly of the metal part (1) and carbon fiber reinforced pipe (2). After the injection, the curing time will be waited and the adhesion will be ensured and it will be used.

[0038] The injected epoxy matrix composite material contains 0.1-10% carbon nanotubes and 0.1-5% aerosil. The carbon nanotube increases the strength of the injected epoxy-based adhesive, while aerosil increases the thixotropic properties of the matrix, reduces its viscosity and helps the interface to be tightly clamped.

[0039] In one embodiment of the method of the invention; in order to fix the metal part (1) adhered to the carbon fiber pipe (2) produced by filament winding method, the conical entry surface of the metal part (8) where the metal part (1) enters the carbon fiber reinforced pipe (2) is used and the metal part (1) is pressed and fixed until the indentation reference (9) of the metal part (1) to the carbon fiber reinforced pipe (2). The adhesive is squeezed through the adhesive squeeze hole (5). The squeezed adhesive passes through the inner surface spreading hole (4) and the adhesive coming from the spreading surface (7) where it spreads inside spreads into the adhesive filling chamber (11) between the carbon fiber reinforced pipe (2) and the metal part (1). After reaching sufficient fullness, the squeezed adhesive starts to transfer from the inner surface spreading holes (4) and when the overflowing adhesive is seen coming from the exit hole for overflowing adhesive to the outer surface (10) to the outer surface, it is understood that the adhesive is at the appropriate fullness inside. By waiting for the appropriate curing time, the sandblasted metal surface (3) on which the adhesive is spread and filled and the surfaces of the carbon fiber pipe (2) produced with filament winding are bonded. It is used by connection shaft slot (6) where the connection shaft is inserted according to the area to be used.

Claims

CLAIMS1. A method of producing polymer matrix carbon fiber reinforced tubular pipe and bonding metal parts to both ends of the pipe to increase durability and provide long-term performance and safety advantages characterized by comprising these following steps, providing a carbon fiber reinforced pipe (2) manufactured by filament winding, providing a metal part (1) to be bonded to the carbon fiber reinforced pipe (2), opening at least one adhesive squeeze hole (5) from the outer surface to the interface of the metal part (1), opening at least one adhesive inner surface spreading hole (4) for the adhesive to enter the inner surface, forming the sandblasted metal surface (3) by increasing the surface area and roughness of the metal part (1) with sandblasting of the metal part (1), inserting the metal part (1) through a conical entry surface of the metal part (8) where it enters the carbon fiber reinforced pipe (2), pressing the metal part (1) into the carbon fiber reinforced pipe (2) up to the indentation reference (9), squeezing epoxy adhesive containing carbon nanotube and aerosil through the adhesive squeeze hole (5), settling the squeezed adhesive in an adhesive filling chamber (11) between the carbon fiber reinforced pipe (2) and the metal part (1), by passing through the adhesive inner surface spreading hole (4) and spreading on an interfacial spreading surface (7), ensuring the adhesive to overflow from the exit hole for overflowing adhesive to the outer surface (10), which is the point where the squeezed adhesive exits from the inside to the outside, to understand that the adhesive has reached sufficient fullness,- bonding the sandblasted metal surface (3) with the surfaces of the filament wound carbon fiber reinforced pipe (2) by waiting for the appropriate curing time, ensuring its use by assembling at least one connection shaft slot (6), to which a connection shaft is attached, according to the area to be used.

2. A method for increasing the bond strength as in claim 1, characterized by the injected epoxy matrix composite material comprises 0.1-10% carbon nanotubes and 0.1-5% aerosil.

3. A method for increasing the bond strength as in claim 1, characterised by ensuring its use by mounting according to the area to be used at least one connection shaft slot (6) into which a connecting shaft is inserted on the metal part (1) bonded with the carbon fiber reinforced pipe (2).

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