CN217605471U

CN217605471U - Composite material bending test device

Info

Publication number: CN217605471U
Application number: CN202221664777.4U
Authority: CN
Inventors: 郑晶; 薛鹏; 钱嘉伟; 贾艳荣; 王飞翔; 盛辉
Original assignee: Jiangsu Hengshen Co Ltd
Current assignee: Jiangsu Hengshen Co Ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2022-10-18
Anticipated expiration: 2032-06-30

Abstract

The utility model discloses a bending test technical field's a combined material bending test device, include: the mounting seat is used for mounting on the testing machine; the bending branch head is arranged on the mounting seat through a support and is used for providing a fulcrum for the sample; the test device comprises a first bending pressure head, a second bending pressure head and a first bending pressure head, wherein the first bending pressure head is used for being installed on the test machine and providing test pressure for a test sample in a three-point bending test; and the positioning plate is used for centering the bending branch head and the first bending pressure head or the second bending pressure head before the bending test. The utility model discloses ability quick adjustment anchor clamps centering nature to break away from the dependence to operating personnel experience, simple structure, work efficiency is high, and is small, and easily operation can be applied to three point bending, four point bending test.

Description

Composite material bending test device

Technical Field

The utility model belongs to the technical field of bending test, concretely relates to combined material bending test device.

Background

The fiber reinforced plastic is firstly used in the fields of military industry and aviation, and the carbon fiber and the composite material thereof have high specific strength and high specific modulus and have remarkable advantages in the aspects of fatigue resistance, shock resistance, vibration reduction performance, high and low temperature resistance, corrosion resistance and the like. In addition, the composite material's designability is one of its most significant advantages over traditional materials. Many components and products are subjected to bending stresses during use, and bending strength and modulus of elasticity are performance criteria that must be considered. The bending test is mainly used for testing the mechanical property of the material under the action of bending load, and the bending test is commonly used for evaluating the capability of the material for bearing bending plastic deformation in production application and is an important reference index for quality control and application design. To obtain effective, real and accurate bending performance, good centering performance is particularly important in bending tests. The bending clamp on the market at present is not designed in the aspect of detecting the neutrality. Centering usually comprises drawing a clamp placing line on a chassis according to the size of a clamp, but the adoption of a line drawing centering mode has certain deviation when different persons draw lines, and has higher requirements on the experience of the persons; whether the clamp is placed in place or not can only be observed by a person, the accuracy is poor, and the centering property of the clamp can only be ensured by the method, but the centering property of the sample cannot be ensured.

SUMMERY OF THE UTILITY MODEL

For solving not enough among the prior art, the utility model provides a combined material bending test device can the centering nature of quick adjustment anchor clamps to break away from the reliance to operating personnel experience, simple structure, work efficiency is high, and is small, and easily operation can be applied to three point bending, four point bending test.

In order to achieve the above purpose, the utility model adopts the technical proposal that: a composite bend testing apparatus comprising: the mounting seat is used for mounting on the testing machine; the bending branch head is arranged on the mounting seat through a support and is used for providing a fulcrum for the sample; the test device comprises a first bending pressure head, a second bending pressure head and a first bending pressure head, wherein the first bending pressure head is used for being installed on the test machine and providing test pressure for a test sample in a three-point bending test; and the positioning plate is used for centering the bending branch head and the first bending pressure head or the second bending pressure head before the bending test.

Further, the locating plate includes: the bending pressure head positioning surface is provided with a central positioning groove and a plurality of groups of bending pressure head positioning grooves which are symmetrical relative to the central positioning groove; the bending branch positioning surface is provided with a plurality of groups of bending branch positioning grooves which are symmetrical relative to the central positioning groove.

Furthermore, the positioning plate is made of stainless steel, the thickness of the positioning plate is 8-10mm, and the distance between any one group of the bending pressure head positioning grooves or any one group of the bending branch head positioning grooves is not less than 16mm.

Furthermore, at least one group of positioning openings which are symmetrical relative to the central positioning groove are arranged on the bending branch head positioning surface, and the positioning openings are used for preventing misoperation.

Further, the opening angle of the positioning opening is 30-50 degrees.

Furthermore, the opening angle of the central positioning groove and the plurality of groups of bending pressure head positioning grooves is 120-140 degrees, and the depth is 3-5mm.

Furthermore, the opening angles of the groups of the bending branch positioning grooves are 100-130 degrees, and the depth is 3-5mm.

Furthermore, the mounting seat comprises a base provided with a dovetail groove, the support is connected with the base through a sliding block matched with the dovetail groove, and the sliding block is mounted on the support through a sliding block connecting screw; the base passes through the chuck and installs on the testing machine, the chuck includes bottom plate and screens piece, the pedestal mounting be in on the bottom plate.

Furthermore, a sample centering block for adjusting the horizontal placing position of the sample and a limiting strip for limiting the rotation angle of the sample centering block are arranged on the support.

Further, a square opening for containing the sample is arranged on the sample centering block.

Compared with the prior art, the utility model discloses the beneficial effect who reaches:

(1) The utility model discloses an install the mount pad on the testing machine; the bending branch head is arranged on the mounting seat through a support and is used for providing a fulcrum for the sample; the positioning plate used for centering the bending support head and the first bending pressure head or the second bending pressure head before the bending test is arranged, the centering property of the clamp can be quickly adjusted, the dependence on the experience of operators is eliminated, the structure is simple, the working efficiency is high, the size is small, the operation is easy, and the positioning plate can be applied to three-point bending and four-point bending tests;

(2) The utility model has the advantages of good centering property, high precision, convenient installation of the positioning plate, easy operation, low cost and convenient processing and manufacturing, and the centering property can be adjusted only by placing the positioning plate on a bending fixture which needs centering;

(3) The utility model discloses a sample is to the horizontal locating position of centering block adjustment sample, realizes the regulation to the centering nature that the sample was placed, can the centering nature of quick adjustment sample to break away from the dependence to operating personnel experience, simple structure, work efficiency is high, and is small, and easily operation can be applied to three point bending, four point bending test.

Drawings

Fig. 1 is a schematic diagram of a composite material bending test apparatus provided by an embodiment of the present invention for centering adjustment before a three-point bending test is performed;

fig. 2 is a schematic structural diagram of a second bending indenter used when a four-point bending test is performed by using a composite material bending test apparatus provided by an embodiment of the present invention;

FIG. 3 is a schematic plan view of the positioning plate of FIG. 1;

fig. 4 is a schematic diagram illustrating adjustment of centering of sample placement before a three-point bending test is performed by using a composite bending test apparatus according to an embodiment of the present invention;

in the figure: 11. a clamping part; 12. a base plate; 13. a base; 131. a dovetail groove; 21. a support; 22. bending the branch head; 23. centering the sample; 24. a limiting strip; 25. the slide block is connected with a screw; 30. positioning a plate; 31. bending a positioning surface of the pressure head; 311. a central positioning groove; 312. a first set of curved indenter positioning slots; 313. a second set of curved indenter positioning slots; 32. bending the branch positioning surface; 321. a first set of curved branch head positioning slots; 322. a second set of curved branch head positioning slots; 323. a third set of curved branch head positioning slots; 324. a fourth group of bending branch head positioning grooves; 325. a fifth group of bending branch head positioning grooves; 33. positioning the opening; 41. a first bending ram; 42. a second bending ram; 5. and (4) sampling.

Detailed Description

The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1 to 4, a composite material bending test apparatus includes: the mounting seat is used for being mounted on the testing machine; the bending support head 22 is arranged on the mounting seat through a support 21 and is used for providing a support point for the sample 5; a first bending ram 41 for mounting on the testing machine and providing a test pressure to the test specimen in a three-point bending test, a second bending ram 42 for mounting on the testing machine and providing a test pressure to the test specimen in a four-point bending test; positioning plate 30 for centering bending head 22 and first bending ram 41 or second bending ram 42 prior to the bending test.

The mounting seat comprises a base 13 provided with a dovetail groove 131, a support 21 is connected with the base 13 through a sliding block matched with the dovetail groove 131, the sliding block is mounted on the support 21 through a sliding block connecting screw 25, and the sliding block can adjust the span on the dovetail groove 131 by loosening the sliding block connecting screw 25. Arc-shaped chucks are arranged on two sides of the base 13, each chuck comprises a bottom plate 12 and a clamping piece 11, and the base 13 is installed on the bottom plate 12. The chuck is placed on the chassis of the testing machine by means of the blocking element 11, so that the base 13 is in the middle of the chassis of the testing machine.

The positioning plate 30 includes: the bending pressure head positioning surface 31 and the bending branch head positioning surface 32 are arranged, and the bending pressure head positioning surface 31 is provided with a central positioning groove 311 and a plurality of groups of bending pressure head positioning grooves which are symmetrical relative to the central positioning groove 311; the curved branch positioning surface 32 is provided with a plurality of groups of curved branch positioning grooves which are symmetrical with respect to the center positioning groove 311.

The positioning plate 30 is of a left-right centrosymmetric structure and is made of stainless steel, and the thickness of the positioning plate is 8mm to 10mm. The opening distance of each set of positioning grooves on the upper surface (curved indenter positioning surface 31) and the lower surface (curved branch positioning surface 32) of the positioning plate 30 is at least 16mm. The upper surface is provided with five openings which are of a central symmetrical structure, the angles of the openings are all 120-140 degrees, the opening depth is set to 130 degrees in the embodiment, and the openings are respectively a central positioning groove 311 for a three-point bending test, a first group of bending pressure head positioning grooves 312 and a second group of bending pressure head positioning grooves 313 for a four-point bending test. Twelve openings are formed in the lower surface, the two openings are of a central symmetry structure, wherein the first group of bent branch head positioning grooves 321, the second group of bent branch head positioning grooves 322, the third group of bent branch head positioning grooves 323, the fourth group of bent branch head positioning grooves 324 and the fifth group of bent branch head positioning grooves 325 are used for testing the alignment of the bent branch heads 22, the angles of the openings are 100-130 degrees, and the depths of the openings are 3-5 mm. The positioning opening 33 is a central symmetrical structure for preventing the opening from being mistakenly seen, the angle of the opening is 30-50 degrees, and due to the fact that the number of the openings on the bending branch positioning surface 32 is large, the positioning opening 33 which is obviously different from other positioning notches in shape or size is arranged at a proper position, so that misoperation can be prevented.

The upper surface (curved indenter positioning surface 31) and the lower surface (curved holder positioning surface 32) of the positioning plate 30 are used in combination. The combination mode is that the opening center positioning groove 311 on the upper surface is matched with a certain group of centrosymmetric openings on the lower surface and is used for the centering test of the three-point bending test of the composite material; either the first set of curved indenter detents 312 or the second set of curved indenter detents 313 on the upper surface are mated to a set of centrally symmetric openings on the lower surface for centering tests in a four-point bending test of the composite material.

Locating plate 30 simple operation when using can inspect centering nature on the crooked anchor clamps that need carry out the centering, can dismantle after the use, later can used repeatedly.

And a sample centering block 23 for adjusting the horizontal placing position of the sample 5 and a limiting strip 24 for limiting the rotation angle of the sample centering block 23 are arranged on the inner side of the support 21, and the sample centering block 23 is arranged on the inner side of the support 21 through bolts. The sample centering block 23 is provided with a square opening for receiving the sample 5, as shown in fig. 1 and 4.

The sample centering block 23 is designed to be rotatable, a square opening is formed in the tail end of the sample centering block 23, and when the sample centering block 23 touches the limiting strip 24, the square opening in the tail end of the sample centering block 23 is just aligned with the sample 5, so that the centering of the sample 5 can be adjusted rapidly.

In this embodiment, the clamp and the sample centering property of the three-point bending test and the four-point bending test are jointly ensured by the positioning plate 30, the sample centering block 23 and the bottom plate 12. The utility model discloses can guarantee the centering nature that anchor clamps were placed to centering nature and sample simultaneously, simple structure, work efficiency is high, and is small, and easily operation can be applied to three point bending, four point bending test. The utility model discloses having broken away from the reliance to operating personnel experience, it is good to neutrality, the precision is high, and the locating plate installation is convenient, easily operates, only needs to put it can adjust the neutrality on the crooked anchor clamps that need carry out the centering, low in cost, manufacturing are convenient.

The three-point bending test is carried out by adopting the composite material bending test device in the embodiment, and the process is as follows: a chuck consisting of a bottom plate 12 and a clamping part 11 is placed on a chassis of the testing machine, and a base 13 is placed between the two chucks. The slider coupling screws 25 are loosened so that the holders 21 can be slid in the dovetail grooves 131, the distance between the holders 21 is adjusted to 96mm, and the slider coupling screws 25 are tightened to fix the holders 21 to the base 13. The positioning plate 30 is placed on the bent legs 22, and at this time, the third set of bent leg positioning grooves 323 are respectively placed on the two bent legs 22. The distance between the first bending pressure head 41 and the positioning plate 30 is adjusted by the testing machine to lift and lower, and the base 13 is adjusted left and right, so that the first bending pressure head 41 is just positioned at the central positioning slot 311 of the positioning plate 30. The positioning plate 30 is removed, the sample 5 is placed on the bent branch head 22, the sample centering block 23 is rotated anticlockwise to the maximum extent, the sample centering block 23 is contacted with the limiting strip 24, the sample 5 is moved, the sample 5 is located in the square opening of the sample centering block 23, and therefore the position of the sample 5 is determined. The sample centering block 23 is rotated clockwise to the original position and test loading is initiated.

The four-point bending test is carried out by adopting the composite material bending test device in the embodiment, and the process is as follows: a chuck consisting of a bottom plate 12 and a clamping part 11 is placed on a chassis of the testing machine, and a base 13 is placed between the two chucks. The slider coupling screws 25 are loosened so that the holders 21 can be slidably moved in the dovetail grooves 131, the distance between the holders 21 is adjusted to 64mm, and the slider coupling screws 25 are tightened to fix the holders 21 to the base 13. The positioning plate 30 is placed on the bent pins 22, and at this time, the second set of bent pin positioning grooves 322 are respectively placed on the two bent pins 22. The distance between the second bending pressure head 42 and the positioning plate 30 is adjusted by lifting the testing machine, and the base 13 is adjusted left and right, so that the two pressure heads of the second bending pressure head 42 are just positioned in the first group of bending pressure head positioning grooves 312 of the positioning plate 30. And removing the positioning plate 30, placing the sample on the bent branch head 22, rotating the sample centering block 23 anticlockwise to the maximum extent, contacting the sample centering block 23 with the limiting strip 24, moving the sample, enabling the sample to be located in the square opening of the sample centering block 23, and determining the position of the sample. The specimen centering block 23 is rotated clockwise to the original position and the test loading is started.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.

Claims

1. A composite material bending test device, comprising:

the mounting seat is used for being mounted on the testing machine;

the bending branch head (22) is arranged on the mounting seat through a support (21) and is used for providing a fulcrum for the sample (5);

a first bending ram (41) for mounting on the testing machine and providing a test pressure to the test specimen in a three-point bending test,

a second bending ram (42) for mounting on the testing machine and providing a test pressure to the test specimen in a four-point bending test;

and the positioning plate (30) is used for centering the bending branch head (22) and the first bending pressure head (41) or the second bending pressure head (42) before the bending test.

2. The composite material bending test apparatus according to claim 1, wherein said positioning plate (30) comprises:

the bending pressure head positioning device comprises a bending pressure head positioning surface (31), wherein a central positioning groove (311) and a plurality of groups of bending pressure head positioning grooves which are symmetrical relative to the central positioning groove (311) are arranged on the bending pressure head positioning surface (31);

the bending branch head positioning surface (32) is provided with a plurality of groups of bending branch head positioning grooves which are symmetrical relative to the central positioning groove (311).

3. The composite material bending test device according to claim 2, wherein the positioning plate is made of stainless steel, the thickness of the positioning plate is 8-10mm, and the distance between any group of the bending indenter positioning grooves or any group of the bending branch positioning grooves is not less than 16mm.

4. The composite material bending test device according to claim 2, wherein the bend leg positioning surface (32) is provided with at least one set of positioning openings (33) that are symmetrical with respect to the center positioning slot (311).

5. The composite bend test apparatus of claim 4, wherein the positioning opening (33) has an opening angle of 30 ° -50 °.

6. The composite material bending test device according to claim 2, wherein the opening angle of the central positioning groove (311) and the plurality of groups of bending indenter positioning grooves is 120-140 degrees, and the depth is 3-5mm.

7. The composite material bending test device according to claim 2, wherein the opening angles of the bending branch positioning grooves of the groups are 100-130 degrees, and the depths are 3-5mm.

8. The composite material bending test device according to claim 1, wherein the mounting seat comprises a base (13) provided with a dovetail groove (131), the support (21) is connected with the base (13) through a sliding block matched with the dovetail groove (131), and the sliding block is mounted on the support (21) through a sliding block connecting screw (25); base (13) are installed on the testing machine through the chuck, the chuck includes bottom plate (12) and screens piece (11), base (13) are installed on bottom plate (12).

9. The composite material bending test device according to claim 1, wherein a sample centering block (23) for adjusting the horizontal placing position of the sample and a limiting strip (24) for limiting the rotation angle of the sample centering block (23) are mounted on the support (21).

10. The composite bend test apparatus of claim 9 wherein said sample centering block (23) is provided with a square opening for receiving a sample.