Tensile test tool for composite material perforated part

Abstract

The utility model discloses a tensile test tool for a composite material perforated piece in the technical field of tool clamps, which comprises an upper clamp, a lower clamp, a lower clamp and a lower clamp, the lower clamp is used for being connected with the composite material tapping piece to be subjected to the tensile test from the edge; the composite material tapping tensile test piece clamping device is simple in design structure and high in economical efficiency, and is particularly simple to operate when being used for clamping a composite material tapping tensile test piece.

Description

Technical Field

[0001] The utility model relates to the technical field of tooling fixtures, and particularly relates to a tensile test tooling. Background Art

[0002] Due to its good strength, high modulus, light weight, high temperature resistance and good formability, carbon fiber composite materials are widely used in the aerospace field. At present, for the open-hole parts of composite materials, direct fixture connection is carried out at the opening and surface, which easily leads to fiber fracture, delamination, and even loss of excellent mechanical properties during the test. In order to accurately and scientifically evaluate the mechanical properties of the open-hole parts of carbon fiber composite materials, the connection method of the test pieces needs to be considered when designing the test tooling, so as to avoid unacceptable failure forms, thereby improving the accuracy and scientific nature of the test data. Content of the Utility Model

[0003] Aiming at the deficiencies existing in the prior art, the utility model provides a tensile test tooling for open-hole parts of composite materials, which solves the problems that the traditional test tooling is easy to cause fiber fracture or delamination on the surface of the composite material when clamping the open-hole parts of carbon fiber composite materials, and is easy to pull off after clamping.

[0004] The purpose of the utility model is realized as follows: A tensile test tooling for open-hole parts of composite materials, comprising:

[0005] An upper fixture for connecting the open-hole part of the composite material to be subjected to tensile test from the through hole;

[0006] A lower fixture for connecting the open-hole part of the composite material to be subjected to tensile test from the edge;

[0007] The upper fixture and the lower fixture move in opposite directions.

[0008] Furthermore, the upper fixture includes an upper connecting part for connecting the testing machine and a pair of upper clamping parts. The two upper clamping parts are connected through a pin shaft penetrating through them, and the pin shaft simultaneously passes through the through hole of the open-hole part of the composite material.

[0009] Furthermore, a steel sleeve is also sleeved on the pin shaft.

[0010] Furthermore, a through hole is opened at the end of the pin shaft, and a split pin is arranged in the through hole.

[0011] Furthermore, the lower fixture includes a lower connecting part for connecting the testing machine and a pair of lower clamping parts for connecting the open-hole part of the composite material from the edge.

[0012] Furthermore, the lower clamping part is integrally in a square frame structure, and a notch for the upper clamping part to enter is opened at the top of the lower clamping part.

[0013] Furthermore, slot holes are opened on both sides of the lower clamping part.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows: The utility model has a simple design structure and high economy. Especially when clamping a composite material open-hole tensile test piece, the operation is simple. The composite material open-hole tensile test piece is clamped in the lower fixture slot hole, and then the upper fixture is sleeved. The tooling is simple to manufacture, and it also avoids the damage to the surface of the composite material open-hole tensile test piece during clamping. In addition, the design of the lower fixture slot hole can also clamp open-hole tensile test pieces of different sizes and specifications, with a wide application range, convenient to use, and can be used for a variety of open-hole tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0016] Figure 1 Structural schematic of the present utility model Figure 1 。

[0017] Figure 2 Structural schematic of the present utility model Figure 2 。

[0018] Figure 3 Structural schematic diagram of the upper fixture in the present utility model.

[0019] Figure 4 Structural schematic diagram of the lower fixture in the present utility model.

[0020] Among them, 100 is the upper fixture, 101 is the upper connecting part, 102 is the upper clamping part, 103 is the pin shaft, 104 is the split pin, 105 is the steel sleeve, 200 is the lower fixture, 201 is the lower connecting part, 202 is the lower clamping part, 202a is the slot hole, and 300 is the composite material open-hole part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0022] As Figures 1-4 shown, a tensile test tooling for a composite material open-hole part includes:

[0023] The upper fixture 100 is used to connect the composite material perforated part 300 to be subjected to tensile test from the through hole;

[0024] The lower fixture 200 is used to connect the composite material perforated part 300 to be subjected to tensile test from the edge;

[0025] The moving directions of the upper fixture 100 and the lower fixture 200 are opposite.

[0026] Specifically, the lower fixture 200 is sleeved on the upper edge of the composite material perforated part 300 to facilitate its downward movement. The upper fixture 100 is connected to the composite material perforated part 300 from the through hole through a connecting piece to facilitate its upward movement.

[0027] Furthermore, the upper fixture 100 includes an upper connecting part 101 for connecting to the testing machine and a pair of upper clamping parts 102. The two upper clamping parts 102 are connected through a pin shaft 103 passing through. The pin shaft 103 simultaneously passes through the through hole of the composite material perforated part 300, and the number of pin shafts 103 is adjusted according to needs.

[0028] Specifically, the upper fixture 100 is of a fork-shaped structure. The upper clamping part 102 is formed by extending both sides of one end of the upper connecting part 101 into a fork-shaped structure. In this embodiment, the upper clamping part 102 is a pair of plate-shaped structures. Two through holes are provided near the lower end of the upper clamping part 102, and a pin shaft 103 is arranged in the through holes. The pin shaft 103 connects the two upper clamping parts 102 and the composite material perforated part 300 in series.

[0029] Furthermore, a steel sleeve 105 is also sleeved on the pin shaft 103, and the number of steel sleeves 105 is adjusted corresponding to the pin shaft 103.

[0030] Specifically, the steel sleeve 105 is sleeved on the pin shaft 103 between the two upper clamping parts 102. The size of the steel sleeve 105 is matched with the size of the through hole of the composite material perforated part 300 to make the force more uniform. When in use, the steel sleeve 105 is first sleeved into the composite material perforated part 300, and then the upper fixture 100 is installed.

[0031] Furthermore, a through hole is provided at the end of the pin shaft 103, and a split pin 104 is arranged in the through hole.

[0032] It should be noted that such a design can play a locking role and improve reliability.

[0033] Furthermore, the lower fixture 200 includes a lower connecting part 201 for connecting to the testing machine and a pair of lower clamping parts 202 for connecting the composite material perforated part 300 from the edge.

[0034] Specifically, the lower clamping part 202 is integrally in a square frame structure, and a notch for the upper clamping part 102 to enter is provided at the top of the lower clamping part 202.

[0035] It should be noted that such a design can wrap the composite material opening part 300 and no longer directly contact the surface of the composite material opening part 300, avoiding damage to the surface of the composite material opening part 300.

[0036] Furthermore, slot holes 202a are formed on both sides of the lower clamping part 202.

[0037] It should be noted that the design of the slot holes 202a can increase the applicable range of the present invention and can cooperate with larger-sized composite material opening parts 300.

[0038] The following further describes the present invention with specific examples.

[0039] Taking a composite material opening tensile test piece with a height of 200 mm and a length of 300 mm as an example, the specific clamping process is as follows:

[0040] 1. According to the clamping position requirements, first place the composite material opening tensile test piece in the slot holes 202a of the lower clamping part 202.

[0041] 2. Fix the lower connecting part 201 of the lower fixture 200 to the clamping part of the universal testing machine.

[0042] 3. Install the steel sleeve 105 into the through hole of the composite material opening part 300 in a tight fit manner.

[0043] 4. Install the upper fixture 100 on the composite material opening part 300. After aligning the through holes of the upper fixture 100 and the steel sleeve 105, insert the pin shaft 103.

[0044] 5. Insert the stainless steel split pin 104 into the hole of the pin shaft 103 to limit the pin shaft 103.

[0045] 6. Fix the upper connecting part 101 of the upper clamp to the clamping part of the universal testing machine.

[0046] 7. The upper end of the universal testing machine pulls upward to complete the tensile test.

[0047] The descriptions of the above embodiments are only used to help understand the method and its core idea of the present invention. It should be pointed out that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A tensile test tool for composite material openings, characterized in that: include: An upper fixture (100) is used to connect the composite material opening piece (300) to be subjected to a tensile test through the through hole; A lower fixture (200) for connecting the composite material opening piece (300) to be tensile tested from the edge; The upper clamp (100) and the lower clamp (200) move in opposite directions.

2. A composite material opening component (300) tensile test tool according to claim 1, characterized in that: The upper clamp (100) comprises an upper connection portion (101) for connecting to a testing machine and a pair of upper clamping portions (102), the two upper clamping portions (102) being connected through a pin shaft (103), and the pin shaft (103) simultaneously passes through a through hole of the composite material opening member (300).

3. A composite material opening component (300) tensile test tool according to claim 2, characterized in that: The pin shaft (103) is also sleeved with a steel sleeve (105).

4. A composite material opening component (300) tensile test tool according to claim 2, characterized in that: A through hole is formed at the end of the pin shaft (103), and a split pin (104) is provided in the through hole.

5. A composite material opening component (300) tensile test tool according to any one of claims 1 to 4, characterized in that: The lower clamp (200) comprises a lower connecting portion (201) for connecting to a testing machine and a pair of lower clamping portions (202) for connecting to a composite material opening member (300) from an edge.

6. A composite material opening component (300) tensile test fixture according to claim 5, characterized in that: The lower clamping portion (202) is in the form of a square frame structure as a whole, and a notch is provided at the top of the lower clamping portion (202) for the upper clamping portion (102) to enter.

7. A composite material opening component (300) tensile test tool according to claim 6, characterized in that: Slot holes (202a) are provided on both sides of the lower clamping portion (202).

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