CN110701430A - Buckling constraint device for composite material pipe - Google Patents

Abstract

The invention discloses a composite material pipe buckling restraint device, which belongs to the technical field of composite materials and comprises a composite material pipe and outer metal sleeves arranged at the outer parts of two ends of the composite material pipe, wherein metal lantern rings are fixedly arranged outside each outer metal sleeve, an external thread is arranged on the outer ring surface of one metal lantern ring, and the outer ring surface of the other metal lantern ring is a smooth surface; the composite material pipe is arranged between the two outer metal sleeves and is arranged inside the metal constraint sleeve, inner threads matched with the outer threads are arranged on the inner wall of the metal constraint sleeve, and the metal lantern ring with the outer ring surface being a smooth surface is abutted against the inner wall of the metal constraint sleeve. The invention effectively restrains the integral instability deformation of the composite material pipe, greatly improves the axial stress bearing capacity and ductility of the composite material pipe, is beneficial to exerting the strength of the composite material pipe and improves the axial load bearing performance of the composite material pipe.

Description

A composite tube buckling restraint device

technical field

The invention belongs to the technical field of composite materials, and particularly relates to a buckling restraint device for a composite material tube.

Background technique

Fiber-reinforced composite materials are composite materials formed by reinforced fiber materials, such as glass fibers, carbon fibers, aramid fibers, etc., and matrix materials through winding, molding or pultrusion and other molding processes. Due to the advantages of light weight, high strength and corrosion resistance, composite materials have gradually been widely used in the engineering field.

With the development of composite material connection technology, it is possible to use composite material pipes to realize large-span space structures. However, the overall instability of the composite pipe is often the cause of structural failure. In addition, the brittle failure characteristics of the thin-walled composite pipe make the composite pipe have insufficient ductility under load and insufficient early warning of failure.

Therefore, in the technical field of composite materials, there is still a need for research and improvement to improve the axial load performance of composite material tubes, which is also a research hotspot and focus in the field of composite material technology at present, and is the starting point for the completion of the present invention. .

SUMMARY OF THE INVENTION

Therefore, the technical problem to be solved by the present invention is: to provide a composite material tube buckling restraint device, which can effectively restrain the overall buckling deformation of the composite material tube, and make the overall instability of the composite material tube develop from a low order to a high order, and the large The axial load bearing capacity and ductility of the composite pipe are greatly improved, which is helpful to exert the strength of the composite pipe and improve its axial load performance.

In order to solve the above technical problems, the technical solution of the present invention is: a composite material tube buckling restraint device, comprising a composite material tube and an outer metal sleeve arranged outside both ends of the composite material tube, each of the outer metal sleeves. A metal collar is fixedly installed on the outside of the cylinder, one outer surface of the metal collar is provided with an external thread, and the other outer surface of the metal collar is a smooth surface; the buckling restraint device also includes a metal collar. Constraining sleeve, the composite material tube located between the two outer metal sleeves is arranged inside the metal constraining sleeve, and the inner wall of the metal constraining sleeve is provided with a thread suitable for the external thread The inner thread is matched, and the metal collar whose outer ring surface is a smooth surface abuts against the inner wall of the metal constraining sleeve.

As an improvement, a plurality of outer rings distributed at intervals are arranged on the outside of the composite material pipe between the two outer metal sleeves, and the outer rings are located inside the metal constraining sleeve, and all the outer rings are arranged at intervals. The maximum outer diameter of the outer ring is smaller than the inner diameter of the metal constraining sleeve.

As a further improvement, the outer ring is glued to the outside of the composite material pipe.

As an improvement, a first preload tooth is arranged between the composite material tube and the outer metal sleeve.

As an improvement, inner metal sleeves are also provided inside both ends of the composite material pipe.

As a further improvement, a second preload tooth is arranged between the composite material tube and the inner metal sleeve.

As an improvement, the metal collar is welded to the outer metal sleeve.

As an improvement, the outer metal sleeve is an outer aluminum alloy sleeve; the metal restraint sleeve is an aluminum alloy restraint sleeve.

After adopting the above-mentioned technical scheme, the beneficial effects of the present invention are:

In the composite pipe buckling restraint device provided by the present invention, a metal collar is designed on the outside of the outer metal sleeve. One of the outer surfaces of the metal collar is provided with external threads, and the other is the outer ring of the metal collar. The surface is a smooth surface, and a metal constraining sleeve is designed on the outside of the composite material pipe between the two outer metal sleeves, and an inner thread is designed on the inner wall of one end of the metal constraining sleeve, so that it can be screwed. The metal confinement sleeve is installed on the outside of the composite material pipe by screwing. During the screwing process, the metal sleeve with a smooth outer ring surface can guide the metal constraining sleeve. At the same time, this installation method, It can effectively ensure the centering of the metal constraining sleeve and the composite material pipe, so that when the composite material pipe is subjected to axial force, it can avoid the metal constraining sleeve sharing the axial force, and the deformation can be restrained by the metal constraining sleeve, so that the composite material pipe can be restrained. The transformation from the existing low-order instability to high-order instability effectively restrains the overall instability and deformation of the composite material pipe, greatly improves the axial load bearing capacity and ductility of the composite material pipe, and improves its axial load performance. The composite material pipe buckling restraint device provided by the invention can effectively restrain the overall instability and deformation of the composite material pipe, make the overall instability of the composite material pipe develop from a low order to a high order, and greatly improve the axial force bearing capacity of the composite material pipe and ductility, which helps to exert the strength of the composite pipe and improve its axial load performance.

Since the outer part of the composite material pipe located between the two outer metal sleeves is provided with several outer rings distributed at intervals, the outer rings are located inside the metal constraining sleeve, so that the composite material pipe can be changed. The state of contact with the metal restraint sleeve controls the restraint performance of the buckling restraint device.

Since the outer ring is glued to the outside of the composite material pipe, the fixing of the outer ring is facilitated by the method of glue bonding.

Since the first preload teeth are arranged between the composite material tube and the outer metal sleeve, that is, the inner wall of the outer metal sleeve is processed with helical teeth to have internal teeth, and the outer circumference of the composite material tube is The external teeth matched with the internal teeth are arranged. When connecting, the interlaminar shear strength of the composite teeth is improved by applying a pre-tightening force, so that the composite material can transmit a larger load at the connection, and the composite material can be realized. Reliable connection of material tube to outer metal sleeve.

Since inner metal sleeves are also arranged inside both ends of the composite material pipe, the ends of the composite material pipe are further reinforced by the inner metal sleeves.

Since the second preload tooth is arranged between the composite material tube and the inner metal sleeve, that is, the inner wall of the composite material tube is processed with helical teeth to have inner teeth, and the outer circumference of the inner metal sleeve is The external teeth matched with the internal teeth are arranged to realize the reliable connection between the composite material tube and the inner metal sleeve.

Since the metal collar is welded to the outer metal sleeve, the fixing of the metal collar is facilitated by welding.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can also be obtained according to the extension of the drawings provided without creative efforts.

The structures, proportions, sizes, etc. shown in this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those who are familiar with the technology, and are not used to limit the conditions for the implementation of the present invention, so there is no technical The substantive meaning of the above, any modification of the structure, the change of the proportional relationship or the adjustment of the size, should still fall within the technical content disclosed in the present invention, without affecting the effect that the present invention can produce and the purpose that can be achieved. within the range that can be covered.

1 is a perspective view of a composite tube buckling restraint device provided by an embodiment of the present invention;

Fig. 2 is the perspective view of removing the metal restraint sleeve in Fig. 1;

3 is a schematic diagram of the relative positions of the composite material tube, the outer metal sleeve and the inner metal sleeve provided by an embodiment of the present invention;

Fig. 4 is A-A sectional view in Fig. 3;

Fig. 5 is a partial enlarged view at B in Fig. 4;

In the picture: 1- Composite material pipe, 2- Outer metal sleeve, 3- Metal collar, 31- Outer thread, 4- Metal restraining sleeve, 5- Outer collar, 6- Inner metal sleeve.

Detailed ways

The embodiments of the present invention are described below by specific specific embodiments. Those who are familiar with the technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the present invention. , not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Terms such as "front", "rear", "left", "right", "inner", "outer", "middle", etc. quoted in this specification are only for the convenience of description and clarity, and are not used for Limiting the applicable scope of the present invention, the change or adjustment of the relative relationship shall be regarded as the applicable scope of the present invention without substantially changing the technical content.

As shown in FIG. 1 to FIG. 5 together, a composite material tube buckling restraint device includes a composite material tube 1 and an outer metal sleeve 2 disposed outside both ends of the composite material tube 1. In order to reduce weight, the outer metal sleeve 2 It is an outer aluminum alloy sleeve. Of course, the outer metal sleeve 2 can also be a steel sleeve, etc., which will not be repeated here; For the fixing of the collar 3, preferably, the metal collar 3 is welded to the outer metal sleeve 2. Of course, the metal collar 3 can also be installed in other ways that can be realized by those skilled in the art, such as gluing, interference fit and so on, and will not be repeated here. The outer ring surface of one metal collar 3 is provided with an external thread 31 , and the outer ring surface of the other metal collar 3 is a smooth surface.

The buckling restraint device further includes a metal restraint sleeve 4. In order to reduce the weight, the metal restraint sleeve 4 is an aluminum alloy restraint sleeve. Of course, the metal restraint sleeve 4 can also be selected from a steel restraint sleeve, etc., which will not be repeated here; The composite material pipe 1 located between the two outer metal sleeves 2 is arranged inside the metal constraining sleeve 4, and the inner wall of the metal constraining sleeve 4 is provided with an internal thread (not shown in the figure) that is adapted to the external thread 31. out), the metal collar 3 whose outer ring surface is a smooth surface abuts against the inner wall of the metal constraining sleeve 4 .

In this way, the metal constraining sleeve 4 can be installed on the outside of the composite material pipe 1 by screwing. During the screwing process, the metal sleeve 3 whose outer ring surface is a smooth surface can guide the metal constraining sleeve 4 At the same time, this installation method can effectively ensure the alignment of the metal restraint sleeve 4 and the composite material pipe 1, so that when the composite material pipe 1 is subjected to axial force, it can avoid the metal restraint sleeve 4 sharing the axial force, and can The deformation of the composite material pipe 1 is restrained by the metal restraining sleeve 4, so that the composite material pipe 1 is transformed from the existing low-order instability to high-order instability, which effectively restrains the overall instability and deformation of the composite material pipe 1, and greatly improves the axis of the composite material pipe 1. The axial load bearing capacity and ductility help to exert the strength of the composite material pipe 1 and improve its axial load performance.

In order to change the contact state between the composite material tube 1 and the metal confinement sleeve 4, as shown in FIG. 2, the outer part of the composite material tube 1 located between the two outer metal sleeves 2 is provided with three spaced outer rings 5, which need to be It should be noted that the number of the outer ring 5 is not limited to three, and those skilled in the art can choose according to actual needs, which will not be repeated here; And the maximum outer diameter of the outer ring 5 is smaller than the inner diameter of the metal restraint sleeve 4, so that the restraint performance of the buckling restraint device can be controlled. Preferably, the outer ring 5 is glued to the outside of the composite material tube 1 , and the fixing of the outer ring 5 is facilitated by the method of glue bonding. Of course, the connection between the outer ring 5 and the composite material pipe 1 can also be realized by means of interference fit.

In order to realize the reliable connection between the composite material pipe 1 and the outer metal sleeve 2, preferably, a first preload tooth (not shown in the figure) is provided between the composite material pipe 1 and the outer metal sleeve 2, that is, the outer metal The inner wall of the sleeve 2 is processed with helical teeth to make it have internal teeth, and external teeth matched with the internal teeth are arranged on the outer circumference of the composite material tube 1. When connecting, the interlaminar shear of the composite material teeth is improved by applying a pre-tightening force. shear strength, so that the composite material can transmit larger loads at the joint. Of course, as an alternative, the composite material tube 1 and the outer metal sleeve 2 can also be connected by means of gluing or the like. However, the way of using pre-tightening tooth connection is obviously better than the way of gluing.

In order to further strengthen the ends of the composite material pipe 1 , with reference to FIGS. 3 , 4 and 5 , inner metal sleeves 6 are also provided inside both ends of the composite material pipe 1 . In order to realize the reliable connection between the composite material pipe 1 and the inner metal sleeve 6, preferably, a second preload tooth (not shown in the figure) is provided between the composite material pipe 1 and the inner metal sleeve 6, that is, in the composite material pipe 1 and the inner metal sleeve 6 The inner wall of the material tube 1 is processed with helical teeth to have internal teeth, and the outer circumference of the inner metal sleeve 6 is provided with external teeth matched with the internal teeth. Of course, as an alternative, the connection between the composite material tube 1 and the inner metal sleeve 6 may also be realized by means of gluing or the like. However, the way of using pre-tightening tooth connection is obviously better than the way of gluing.

To sum up, the composite material pipe buckling restraint device provided by the embodiment of the present invention, combined with the strengthening of the pre-tightening tooth connection, adopts the metal restraint sleeve 4 to restrain the overall buckling deformation of the composite material pipe 1, so that the composite material pipe 1 is unstable from low-order instability. The transition to high-order instability greatly improves the axial load bearing capacity and ductility of the composite material pipe 1, which helps to exert the strength of the composite material pipe and improves its axial load bearing performance.

Although the present invention has been described in detail above with general description and specific embodiments, some modifications or improvements can be made on the basis of the present invention, which will be obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention fall within the scope of the claimed protection of the present invention.

Claims (8)

1. The buckling restraint device for the composite material pipe comprises the composite material pipe and outer metal sleeves arranged at the outer parts of two ends of the composite material pipe, and is characterized in that metal lantern rings are fixedly arranged at the outer parts of the outer metal sleeves, an external thread is arranged on the outer ring surface of one metal lantern ring, and the outer ring surface of the other metal lantern ring is a smooth surface;

the buckling constraint device further comprises a metal constraint sleeve, the composite material pipe between the two outer metal sleeves is arranged inside the metal constraint sleeve, an inner thread matched with the outer thread is arranged on the inner wall of the metal constraint sleeve, and the metal sleeve ring with the outer ring surface being a smooth surface abuts against the inner wall of the metal constraint sleeve.

2. The composite tube buckling restraint apparatus of claim 1, wherein a plurality of spaced outer collars are disposed on the outside of the composite tube between the two outer metal sleeves, the outer collars are disposed inside the metal restraining sleeves, and the maximum outer diameter of the outer collars is smaller than the inner diameter of the metal restraining sleeves.

3. The composite tube buckling restraint apparatus of claim 2, wherein the outer collar is glued to an exterior of the composite tube.

4. A composite tube buckling restraint apparatus as claimed in claim 1, 2 or 3 wherein a first pre-load tooth is provided between the composite tube and the outer metal sleeve.

5. A composite tube buckling restraint according to claim 1, 2 or 3, wherein inner metal sleeves are further provided internally of both ends of the composite tube.

6. The composite tube buckling restraint apparatus of claim 5, wherein a second pre-load tooth is disposed between the composite tube and the inner metal sleeve.

7. The composite tube buckling restraint device of claim 1, wherein the metal collar is welded to the outer metal sleeve.

8. The composite tube buckling restraint apparatus of claim 1, wherein the outer metal sleeve is an outer aluminum alloy sleeve; the metal constraint sleeve is an aluminum alloy constraint sleeve.

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