Fracture toughness test clamp suitable for various thicknesses

Abstract

The utility model relates to the field of metal material fracture mechanical tests, and particularly discloses a fracture toughness test clamp suitable for various thicknesses, which comprises a clamp seat and two opposite loading arms, the loading arms are slidably connected onto the clamp seat, the two loading arms are simultaneously in threaded connection onto a two-way screw, the two-way screw is mounted on the clamp seat, and the two-way screw is in threaded connection with the clamp seat. The two loading arms are used for getting close to or getting away from each other along the two-way screw, and the two-way screw is in threaded connection to the center line of the loading arms. The scheme is used for solving the problem that a traditional integrated tool cannot adapt to samples with different thicknesses.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of metal material fracture mechanics test, concretely relates to a fracture toughness test fixture suitable for various thicknesses. BACKGROUND

[0002] Fracture toughness is an important indicator for evaluating the ability of materials to resist macroscopic crack initiation, especially in the mechanical property testing of metal materials. Currently, C(T) specimens (compact tension specimens) are commonly used for fracture toughness testing in laboratories at home and abroad, and relevant testing standards include ASTM E399 and GB / T 4161, etc. These standards make clear requirements for the size, shape of the specimen and the design of the testing fixture.

[0003] According to the ASTM E399 and GB / T 4161 standards, the thickness (B) and width (W) of the C(T) specimen must satisfy the ratio requirement of 2 ≤ W / B ≤ 4. Traditional integrated fixtures are usually designed based on the ratio of W / B = 2 and are suitable for specimens of a single thickness. However, in actual production, the thickness of the plate varies greatly, resulting in the need to process multiple sets of fixtures for specimens of different thicknesses. This not only increases the cost of detection, but also causes waste of resources.

[0004] In the prior art, for fracture toughness testing, the technology with patent announcement number CN215866106U discloses a specimen fixture for evaluating the fracture toughness testing of high-strength steel sheet, which solves the problem of easy warping of thin plate specimens during testing through the design of clamping plates and top rods. However, this fixture is only suitable for thin plate specimens of a specific thickness and cannot adapt to specimens of different thicknesses. The technology with patent announcement number CN222013785U discloses a fixing fixture applied to fracture toughness testing, which can adapt to steel rods and test pieces of different diameters through the design of bidirectional screws and arc-shaped clamping plates. However, this fixture is mainly used for the fixation of cylindrical test pieces and cannot meet the testing requirements of C(T) specimens. SUMMARY

[0005] The utility model intends to provide a fracture toughness testing fixture suitable for various thicknesses to solve the problem that traditional integrated fixtures cannot adapt to specimens of different thicknesses.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0007] A fracture toughness testing fixture suitable for various thicknesses, comprising a fixture base and two opposite loading arms, the loading arms are slidingly connected to the fixture base, the two loading arms are simultaneously threadedly connected to a bidirectional screw, the bidirectional screw is installed on the fixture base, the two loading arms are used to move closer to / distance from each other along the bidirectional screw, and the bidirectional screw is threadedly connected to the centerline of the loading arm.

[0008] The principle and advantages of the present application are: the two-way screw on the clamp seat is rotated to make the two loading arms approach or move away from each other along the clamp seat, thereby meeting the clamping requirements of test pieces of different thicknesses, and the whole clamp structure is simple and convenient to adjust.

[0009] In addition, the two-way screw directly acts on the center line of the loading arm, making the loading arm slide more smoothly.

[0010] Preferably, as an improvement, a T-shaped sliding groove is arranged on the clamp seat, and the loading arm is slidingly connected in the T-shaped sliding groove and is embedded with the T-shaped sliding groove.

[0011] Preferably, as an improvement, a baffle is detachably connected to both ends of the T-shaped sliding groove, and the baffle is used to block the end of the T-shaped sliding groove to prevent the loading arm from coming out of the T-shaped sliding groove.

[0012] Preferably, as an improvement, the two-way screw idles on the baffle.

[0013] Preferably, as an improvement, an adjusting knob is fixed to the end of the two-way screw to facilitate the adjustment of the position of the loading arm.

[0014] Preferably, as an improvement, a size scale is arranged on the clamp seat to facilitate the test personnel to quickly and accurately know the thickness of the test sample. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a three-dimensional structure schematic view of the embodiment of the utility model.

[0016] Figure 2 It is a three-dimensional structure schematic view of the two-way screw and the loading arm in the embodiment of the utility model.

[0017] Figure 3 It is Figure 1 the right view of the clamp seat.

[0018] Figure 4 It is a three-dimensional structure schematic view of the loading arm in another view in the embodiment of the utility model. DETAILED DESCRIPTION

[0019] The following will be further described in detail through specific embodiments:

[0020] The reference signs in the drawings of the specification include: clamp seat 1, loading arm 2, adjusting knob 3, baffle 4, scale line 5, two-way screw 6, T-shaped sliding groove 7, T-shaped nesting structure 8.

[0021] The embodiment is basically as shown in the accompanying drawings. Figures 1 to 4

[0022] ​The utility model provides a kind of fracture toughness test fixture suitable for multiple thicknesses, including fixture base 1, loading arm 2, two-way screw rod 6 and baffle 4.Fixture base 1 is used to connect with testing machine in later test.The number of loading arm 2 is two, and it is arranged in parallel.T-shaped sliding groove 7 is opened on fixture base, and T-shaped nesting structure 8 is integrally formed on loading arm 2, T-shaped nesting structure 8 can be nested in T-shaped sliding groove 7, and it is convenient for loading arm 2 to move along T-shaped sliding groove 7.The length direction both ends of T-shaped sliding groove 7 of fixture base 1 are fixed with baffle 4 by screw, baffle 4 is supported with two-way screw rod 6, and the two threads of two-way screw rod 6 are respectively connected with two loading arms 2, and the end of two-way screw rod 6 that extends out baffle 4 is installed with adjusting knob 3, and two loading arms 2 can be close to each other or away from each other by rotating adjusting knob 3.

[0023] To facilitate the record of the movement position of loading arm 2 and the visualization of the distance between loading arm 2, scale line 5 is processed on fixture base 1.

[0024] Before test, first, two T-shaped nesting structures 8 are connected with two-way screw rod 6 together with loading arm 2, and then the whole is installed in T-shaped sliding groove 7, so that two loading arms 2, two-way screw rod 6 and T-shaped sliding groove 7 are connected into a whole. Then install two side baffles 4, and fix them on both sides of T-shaped sliding groove 7 to limit the maximum displacement of loading arm 2.

[0025] During test, according to the thickness of the sample to be tested, rotate adjusting knob 3 to drive two-way screw rod 6 to rotate. Since two-way screw rod 6 is an integral two-side reverse thread structure, its rotation will drive two loading arms 2 to move in opposite directions at the same time. The operator can adjust the distance between loading arms 2 to the appropriate distance according to the position indicated by the precise scale line 5 to adapt to the thickness of the sample to be tested. After adjustment, the whole tooling is clamped to the testing machine through the fixture base 1, the sample is clamped, and the fracture toughness test can be carried out.

[0026] For example, when testing a metal sample with a thickness of 25mm, the operator observes the precise scale line, rotates the adjusting knob 3 to adjust the distance between the loading arms 2 to the scale position corresponding to the thickness, and then clamps the sample between the loading arms 2 and starts the testing machine for testing. During the test, the two side baffles 4 prevent the loading arms 2 from falling off, ensuring the smooth progress of the test.

[0027] The above only is the embodiment of the present application, and the well-known specific technical solutions and / or common knowledge in the scheme are not described in detail. It should be pointed out that, for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope claimed in the present application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A fracture toughness testing fixture suitable for various thicknesses, comprising a fixture base and two opposing loading arms, the loading arms being slidably connected to the fixture base, and both loading arms being threadedly connected to a bidirectional screw, characterized in that: The bidirectional screw is installed on the clamp seat, and two loading arms are used to move closer to or away from each other along the bidirectional screw, and the bidirectional screw is threadedly connected on the center line of the loading arm.

2. A fracture toughness test fixture suitable for use with a variety of thicknesses according to claim 1, wherein: A T-shaped sliding groove is arranged on the clamp seat, and the loading arm is slidingly connected in the T-shaped sliding groove and is embedded with the T-shaped sliding groove.

3. A fracture toughness test fixture suitable for use with a variety of thicknesses according to claim 2, wherein: The two ends of the T-shaped sliding groove are detachably connected with the baffle.

4. A fracture toughness test fixture suitable for use with a variety of thicknesses according to claim 3, wherein: The bidirectional screw idles on the baffle.

5. A fracture toughness test fixture suitable for use with a variety of thicknesses according to claim 3, wherein: An adjusting knob is fixed at the end of the bidirectional screw.

6. A fracture toughness test fixture suitable for use with a variety of thicknesses according to any one of claims 1-5, characterized in that: A size scale is arranged on the clamp seat.

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