CN211717948U

CN211717948U - Long-term hoop loading fixture for composite material cylinder

Info

Publication number: CN211717948U
Application number: CN202020380653.8U
Authority: CN
Inventors: 王波; 江超; 康永胜; 白宇杰; 杨福江; 王文才
Original assignee: Research Institute of Physical and Chemical Engineering of Nuclear Industry
Current assignee: Research Institute of Physical and Chemical Engineering of Nuclear Industry
Priority date: 2020-03-24
Filing date: 2020-03-24
Publication date: 2020-10-20
Anticipated expiration: 2030-03-24

Abstract

The utility model discloses a long-term hoop loading fixture for composite material cylinders, which comprises a tray, a plurality of outwards radiating strip-shaped guide rails arranged on the tray, and expansion blocks connected with each strip-shaped guide rail in a sliding way; the outsides of the expansion blocks are sleeved together through a composite material cylinder; and a pressurizing hole is formed between the centers of the expansion blocks in a surrounding manner, a pressurizing device is installed in the pressurizing hole, the pressurizing device relatively moves in the pressurizing hole towards the expansion blocks, and the radial component of the generated pressure pushes the expansion blocks to move along the radial direction of the composite material cylinder test piece, so that the performance test of the composite material is performed. The long-term hoop loading fixture for the fiber reinforced composite cylinder can realize hoop loading of a cylinder test piece, and the reasonable design of the size of the pressure head and the size of the expansion block can ensure that the test piece can be stably loaded for a long time and the hoop stress is uniform. Provides a basis for the durability evaluation of the material.

Description

Long-term hoop loading fixture for composite material cylinder

Technical Field

The utility model belongs to the technical field of the mechanical properties test of fiber reinforced composite, especially, relate to a long-term hoop loading fixture of combined material drum.

Background

The fiber reinforced composite material is widely applied to the fields of ships, bridges and aerospace by virtue of the advantages of high modulus, high strength, fatigue resistance and the like. However, under the action of a long-term constant load, the inherent defects in the composite material may expand along the interlayer interface, and after accumulation, local stress concentration may be caused and the mechanical property of the composite material may be deteriorated. Therefore, it is necessary to evaluate the durability of a fiber-reinforced composite material in a highly reliable and long-life mechanical device with respect to performance indexes such as modulus and strength.

A general method for evaluating the durability of a fiber reinforced composite material firstly needs to carry out long-term loading on a composite material test piece for a certain time by a testing device such as a tensile machine and then carry out testing on the mechanical properties such as modulus, strength and the like of the test piece.

The limitations of the above test methods are: firstly, the enough test sample size is difficult to obtain within a certain time by carrying out long-term loading through a tensile machine and other test equipment, and the error of the test result is easy to increase; secondly, for a composite material cylindrical test piece, the common test equipment is difficult to realize the annular uniform loading of the cylindrical test piece, and the purpose of checking the durability of the test piece cannot be realized.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a long-term hoop loading fixture of combined material drum to solve the problem of background art.

In order to achieve the above object, the utility model discloses a long-term hoop loading fixture of combined material drum's concrete technical scheme as follows:

a long-term annular loading fixture for a composite material cylinder comprises a tray, a plurality of outwards radiating strip-shaped guide rails arranged on the tray, and expansion blocks connected to each strip-shaped guide rail in a sliding manner; the outsides of the expansion blocks are sleeved together through a composite material cylinder;

and a pressurizing hole is formed between the centers of the expansion blocks in an enclosing manner, a pressurizing device with a self-locking function is installed in the pressurizing hole, the pressurizing device relatively moves in the pressurizing hole towards the direction of the expansion blocks, and the radial component of the generated pressure pushes the expansion blocks to move along the radial direction of the composite material cylinder test piece, so that the performance test of the composite material is carried out.

Furthermore, the number of the strip-shaped guide rails is at least three, and the strip-shaped guide rails are distributed in an equal-angle annular mode.

Further, the bar-shaped guide rail is of a bar-shaped groove structure, a boss is arranged at the bottom of the expansion block, and the boss is connected in the bar-shaped groove in a sliding mode, so that radial movement of the expansion block is achieved.

Furthermore, the outer contour of the expansion blocks contacting the composite material cylinder is of a fan-shaped structure, and the fan-shaped structure of the outer contour of the expansion blocks surrounds a complete circumference.

Further, the pressurizing device is of a wedge-shaped structure.

Further, the pressurizing device includes: the device comprises a wedge-shaped pressure head movably inserted into a pressurizing hole of the expansion block and a telescopic adjusting device connected to the wedge-shaped pressure head, wherein the telescopic adjusting device drives the wedge-shaped pressure head to move in the pressurizing hole, and the radial component of the generated pressure pushes the expansion block to move along the radial direction of the composite material cylinder test piece.

Furthermore, the wedge-shaped pressure head is of a triangular platform structure which is arranged in an inverted mode.

Furthermore, the telescopic adjusting device is a load adjusting bolt, and the load adjusting bolt is installed from a mounting hole at the bottom of the tray and used for adjusting the relative position of the pressure head and the expansion block and ensuring that the load on the composite material cylinder is constant in a long time.

Furthermore, a gasket is sleeved on the load adjusting bolt.

Furthermore, positioning holes are formed in the periphery of the tray, the tray is fixed to the base with the through hole, and locking bolts penetrate into the positioning holes to bolt the base and the tray together.

Compared with the prior art, the utility model discloses following beneficial effect has:

the long-term hoop loading fixture for the fiber reinforced composite cylinder can realize hoop loading of a cylinder test piece, and the reasonable design of the size of the pressure head and the size of the expansion block can ensure that the test piece can be stably loaded for a long time and the hoop stress is uniform. Provides a basis for the durability evaluation of the material. The loading fixture is simple in structure, few in parts and small in occupied area, and by means of the load adjusting bolt, due to the fact that the thread fit has self-locking performance, loading equipment such as a swing-off press machine can stably load a test piece for a long time, and the loading requirement of a large sample volume test can be met.

Drawings

Fig. 1 is a front perspective view of the structure of the present invention;

FIG. 2 is a bottom perspective view of the structure of the present invention;

FIG. 3 is a perspective sectional view of the structure of the present invention;

FIG. 4 is a partial plan sectional view of the structure of the present invention;

the reference numbers in the figures illustrate: the device comprises a pressure head 1, an expansion block 2, a tray 3, a load adjusting bolt 4, a composite material cylinder 5 and a base 6.

Detailed Description

For a better understanding of the objects, structure and function of the invention, reference should be made to the drawings, FIGS. 1-4, which are included to illustrate the invention.

As shown in fig. 1-3, a long-term hoop loading fixture for a composite material cylinder is designed, which comprises a tray 3, a plurality of outward-radiating strip-shaped guide rails arranged on the tray 3, and an expansion block 2 slidably connected on each strip-shaped guide rail; tray 3 is circular, and open at the middle part has the mounting hole, establishes through combined material drum 5 common cover between a plurality of inflation piece 2 outsides, wraps up a plurality of inflation piece 2's lateral wall simultaneously with a set of combined material drum 5, and tray 3 and inflation piece 2 complex up end are scribbled lubricating grease to reduce the friction between the structure. In addition, positioning holes are formed in the periphery of the tray 3, and the tray 3 is fixed to the base 6 with the through holes, as shown in fig. 4, locking bolts are inserted into the positioning holes to bolt the base 6 and the tray 3 together.

When the ram 1 moves downwards, the radial component of the pressure generated by the ramp pushes the expansion blocks 2 to move in the radial direction of the test piece of composite material cylinder 5. When the expansion block 2 moves outwards and radially, the composite material cylinder 5 is expanded for testing; the long-term annular uniform loading of the composite material cylinder 5 test piece is realized through a simpler structure, and the evaluation of the durability of the material is facilitated. Meanwhile, the fixture can be processed in batch, and the sample size of the test piece can be enlarged in a short time.

And a pressurizing hole is formed between the centers of the expansion blocks 2 in a surrounding manner, a pressurizing device is installed in the pressurizing hole, the pressurizing device relatively moves towards the expansion blocks 2 in the pressurizing hole, and the radial component of the generated pressure pushes the expansion blocks 2 to move along the radial direction of the composite material cylinder 5 test piece. The number of the strip-shaped guide rails is at least three, and the strip-shaped guide rails are distributed in an equal-angle annular mode. The following is an overview of three strip-shaped guide rails and three expansion blocks 2 as an example: the bar guide rail is bar groove structure, and the bottom of expansion block 2 is equipped with the boss, boss sliding connection in bar recess to realize expansion block 2's radial movement. The outer contour of the expansion blocks 2 contacting the composite material cylinder 5 is a fan-shaped structure, the fan-shaped structures of the outer contours of the expansion blocks 2 surround a complete circumference, and the expansion blocks 2 move outwards and radially integrally.

Wherein, pressure device is wedge structure, and preferred pressure device structure includes: the wedge-shaped pressure head 1 can be movably inserted into the pressurizing hole of the expansion block 2, and the telescopic adjusting device is connected to the wedge-shaped pressure head 1 and drives the wedge-shaped pressure head 1 to move in the pressurizing hole, so that the radial component of the generated pressure pushes the expansion block 2 to move along the radial direction of the test piece of the composite material cylinder 5. The wedge-shaped pressing head 1 is preferably of a triangular platform structure which is arranged in an inverted manner. The inner side of the expansion block 2 is provided with an inclined plane with the same angle as the pressure head 1, the outer side of the expansion block is an arc surface, the diameter of the arc is the same as the inner diameter of a test piece of the composite material cylinder 5, and the diameter of the outer circle of the expansion block 2 can be increased properly to be consistent with the inner diameter of the test piece of the cylinder after loading deformation, so that the uniformity of the hoop stress of the test piece is improved.

Wherein, scalable adjusting device is load adjusting bolt 4, has still cup jointed the gasket on the load adjusting bolt 4, according to experimental needs, and the fastening dynamics is realized adjusting to the increase gasket figure of suitability. The self-locking performance of thread fit is mainly utilized to realize the motion and self-locking of the wedge-shaped pressure head 1 relative to the expansion block 2, and the load adjusting bolt 4 is installed from a mounting hole at the bottom of the tray 3 to adjust the relative position of the pressure head 1 and the expansion block 2 and ensure the constant load borne by the composite material cylinder 5 in a long time.

The following list of preferred example parameters and part materials in the test: the composite material cylinder 5 is made of a fiber reinforced composite material cylinder, a pressure head 11 is made of 65Mn, 3 inclined planes with an included angle of 86 degrees with the horizontal plane are machined on the outer side of the pressure head, the height of each inclined plane is 50mm, and the total height of the pressure head 1 is 68 mm. The center of the bottom of the pressure head 1 is provided with an M30 threaded hole with the depth of 42 mm. The surface of the pressure head 1 is subjected to heat treatment to improve the surface hardness, and meanwhile, galvanization passivation is carried out.

The expansion block 2 is made of 65Mn, the included angle between the inner side inclined plane and the horizontal plane is 86 degrees, the height of the inclined plane is 57mm, and the edge at the bottom end of the inclined plane is 26m away from the central line. The height of the test piece sleeving section of the composite material cylinder 5 is 70mm, and the total height of the expansion block 2 is 90 mm. Processing a bolt mounting hole with the diameter of 84mm and the depth of 25mm at the bottom end of the expansion block 2, wherein the inner diameter of a bolt positioning boss is 33mm, and the thickness of the bolt positioning boss is 8 mm; the surface of the expansion block 2 is subjected to heat treatment to improve the surface hardness and is passivated by galvanizing. The tray 3 is made of Q235 and has a diameter of 230 mm. The thickness is 5 mm. The middle part is provided with a through hole with the diameter of 85 mm. The surface of the tray 3 is heat-treated to increase the surface hardness while being passivated by galvanization.

The load adjusting bolt 4 with a gasket is selected from GB/T5783-. The bolt material is 40Cr, the washer is Q235, and the surfaces of the bolt and the washer are subjected to galvanizing passivation treatment.

By utilizing the fixture, when the long-term hoop loading of the composite material cylinder 5 with the inner diameter of 100mm and the height of 60mm is carried out, when the pressure head 1 is compressed downwards by 20mm from the initial position, the hoop strain of the composite material cylinder 5 can reach 1.5%, and the cylinder is uniformly stressed along the hoop direction and is stable for a long time. The long-term annular uniform loading of the composite material cylinder 5 test piece is realized through a simpler structure, and the evaluation of the durability of the material is facilitated.

It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes or equivalents may be substituted for elements thereof by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are intended to be covered by the present invention.

Claims

1. The long-term hoop loading fixture for the composite material cylinder is characterized in that: comprises a tray (3), a plurality of outwards radiating strip-shaped guide rails arranged on the tray (3), and expansion blocks (2) connected on each strip-shaped guide rail in a sliding way; the outsides of the expansion blocks (2) are sleeved together through a composite material cylinder (5);

and a pressurizing hole is formed between the centers of the expansion blocks (2) in a surrounding manner, a pressurizing device with a self-locking function is installed in the pressurizing hole, the pressurizing device relatively moves in the pressurizing hole towards the expansion blocks (2), and the radial component of the generated pressure pushes the expansion blocks (2) to move along the radial direction of the test piece of the composite material cylinder (5), so that the performance test of the composite material is carried out.

2. The composite material cylinder long term hoop loading fixture of claim 1, wherein there are at least three of the strip rails, and the strip rails are disposed in an equiangular annular arrangement with respect to each other.

3. The long-term hoop loading fixture for composite material cylinders according to claim 2, characterized in that the strip-shaped guide rails are in a strip-shaped groove structure, and the bottom of the expansion block (2) is provided with a boss which is slidably connected in the strip-shaped groove, so that the expansion block (2) can move radially.

4. A composite cylinder long term hoop loading fixture as claimed in claim 3, wherein the outer profile of said expansion blocks (2) contacting the composite cylinder (5) is a fan-shaped structure, and the fan-shaped structure of the outer profile of a plurality of said expansion blocks (2) encloses a complete circumference.

5. The composite material cylinder long term hoop loading fixture of claim 1, wherein the compression device is a wedge-shaped structure.

6. The composite material cylinder long term hoop loading fixture of claim 5, wherein the pressurization device comprises: the wedge-shaped pressure head (1) movably inserted into the pressurizing hole of the expansion block (2) and the telescopic adjusting device connected to the wedge-shaped pressure head (1) drive the wedge-shaped pressure head (1) to move in the pressurizing hole, and the radial component of the generated pressure pushes the expansion block (2) to move along the radial direction of the test piece of the composite material cylinder (5).

7. The composite material cylinder long-term hoop-loading fixture as recited in claim 6, characterized in that the wedge-shaped indenter (1) is a triangular platform structure placed upside down.

8. The composite material cylinder long-term circumferential loading fixture according to claim 6, wherein the telescopic adjusting device is a load adjusting bolt (4), and the load adjusting bolt (4) is installed from a mounting hole at the bottom of the tray (3) to adjust the relative position of the pressure head (1) and the expansion block (2) so as to ensure that the load applied to the composite material cylinder (5) is constant for a long time.

9. The composite material cylinder long-term hoop-loading fixture as claimed in claim 8, wherein a gasket is further sleeved on the load adjusting bolt (4).

10. The composite material cylinder long-term hoop loading fixture as claimed in any one of claims 1-9, wherein the tray (3) is provided with positioning holes on its periphery, and the tray (3) is fixed on a base (6) with through holes, and locking bolts are inserted into the positioning holes to bolt the base (6) and the tray (3) together.