CN205506548U - A brittle material compression test fixture - Google Patents

Abstract

The utility model relates to a brittle material compression test anchor clamps, specially adapted brittle material compressive strength is experimental. The utility model discloses a by upper and lower centering rod, upper and lower backup pad, upper and lower briquetting and spherical seat constitute, wherein the lower support bar with be connected by spherical seat down between the briquetting, spherical seat can realize down the small slope of briquetting in order to guarantee sample surface and last briquetting parallel surface to solve the small deviation problem between the unable compensation sample of compression dish anchor clamps and the clamp plate depth of parallelism. The utility model discloses a be applicable to and install and use on ordinary material testing machine, can realize that compressive strength is experimental, and have simple structure, in the aspect of the use, characteristics such as easy dismouting.

Description

A brittle material compression test fixture

technical field

The utility model belongs to the field of development and manufacture of experimental appliances, in particular to a fixture used for compression tests of brittle materials.

Background technique

When carrying out compression tests on material testing machines, it is usually necessary to configure compression fixtures to fix the samples, and the fixtures used for different materials and experimental purposes are also different. Patent CN 203798673 U provides a high-temperature compression fixture, which solves the problem of testing high-temperature compression performance indicators of materials; patent CN204461890U provides a fully-supported sheet compression fixture, which overcomes the lack of effective support in the middle working section of the sample in traditional fixtures The problem of prone to buckling failure; the patent CN 204422329 U provides a compression fixture on a mechanical tensile creep testing machine, which solves the problem that the compression creep test cannot be performed on the mechanical tensile creep endurance testing machine. For non-metallic brittle materials such as refractory materials, since the compression disc fixture cannot compensate for the small deviation between the parallelism of the compression surface of the sample and the pressure plate during the test, the force on the surface of the sample is uneven, causing the sample to be partially damaged, resulting in The test data fluctuates greatly, which cannot reflect the real strength of the refractory material, and the success rate of the test is low. Through the inquiry, there is no design invention about the compression test fixture for brittle materials, so there is an urgent need for a brittle material compression fixture to solve the above problems.

Contents of the invention

In view of the above problems, the utility model provides a brittle material compression test fixture, which solves the problem that the compression disc fixture cannot compensate the slight deviation between the compression surface of the sample and the parallelism of the pressure plate, and is connected with the material testing machine through design and manufacture. The compressive strength test of refractory materials has high practical value.

Above-mentioned technical problem is not solved, and the technical scheme that the utility model adopts:

A brittle material compression test fixture, mainly composed of an upper centering rod, a lower centering rod, an upper support plate, a lower support plate, an upper pressing block, a lower pressing block and a spherical seat; wherein the upper centering rod, the lower centering rod It is fixedly connected with the upper supporting plate and the lower supporting plate through threads; the upper pressing block is fixedly connected with the upper supporting plate through threads; the lower supporting plate and the lower pressing block are connected by a spherical seat, and the lower pressing block is fixedly connected with the spherical seat through threads.

Further, the shapes and specifications of the upper centering rod and the lower centering rod of the brittle material compression test fixture match the testing machine fixture.

Further, the upper press block and the lower press block of the brittle material compression test fixture are provided with a central ring-shaped line, which is convenient for sample centering.

Further, the lower support plate of the brittle material compression test fixture is provided with a spherical groove, the size of which matches the spherical seat, and the spherical seat can move slightly in the spherical groove of the lower support plate, and the inclination angle of the lower pressing block can be adjusted to ensure that the test The surface of the sample is parallel to the surface of the upper compact.

Further, each part of the brittle material compression test fixture is made of die steel.

Compared with the prior art, the present invention has the following beneficial effects due to the adoption of the above technical scheme:

The fixture of the invention has simple structure, convenient manufacture and use, easy disassembly and assembly, and can be installed and used on common material testing machines. A center loop line is provided on the fixture to facilitate sample centering. By adopting the design of the spherical seat, the contact plane can be automatically fine-tuned when the sample is stressed, which ensures the uniform force of the sample and improves the accuracy of the data.

Description of drawings:

Fig. 1 is the clamp structure schematic diagram provided by the present invention,

Among them, 1- upper centering rod, 2- upper supporting plate, 3 upper pressing block, 4- lower supporting plate, 5- spherical seat, 6- lower centering rod, 7- lower pressing block;

Figure 2 is the stress-strain curve diagram of the sample compression test.

detailed description

Below in conjunction with accompanying drawing, the utility model is further elaborated:

The refractory compression test fixture shown in Figure 1 is mainly composed of an upper centering rod 1, a lower centering rod 6, an upper supporting plate 2, a lower supporting plate 4, an upper pressing block 3, and a lower pressing block 7. All parts are made of die steel.

Among them, the upper centering rod 1 and the lower centering rod 6 are fixedly connected with the upper supporting plate 2 and the lower supporting plate 4 through threads; the upper pressing block 3 is fixedly connected with the upper supporting plate 2 through threads; the lower supporting plate 4 and the lower pressing block 7 They are connected by a spherical seat 5, and the lower pressing block 7 is fixedly connected with the spherical seat 5 by threads.

The upper centering rod 1 and the lower centering rod 6 are respectively installed in the upper and lower clamps of the testing machine, and the shape and specification match the clamps of the testing machine. The upper pressing block 3 and the lower pressing block 7 are provided with a center circle line, which is convenient for sample centering.

The lower support plate 4 is provided with a spherical groove whose size matches the spherical seat 5. The spherical seat 5 can move slightly in the spherical groove of the lower support plate 4, and the inclination angle of the lower pressing block 7 is adjusted to ensure that the surface of the sample is in line with the upper pressure during the test. Block 3 surfaces are parallel. Put a little lubricating oil on the spherical seat 5 and put it into the spherical groove of the lower support plate 4, put the sample to be tested into the center circle of the upper pressing block 3 and the lower pressing block 7, center and set the test parameters for testing. The upper pressing block 3 and the lower pressing block 7 can be replaced with different specifications according to the sample size. The stress-strain curve of the sample compression test is shown in Fig. 2.

The utility model can also have other various embodiments, but without departing from the spirit and essence of the invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes and All deformations should belong to the protection scope of the appended claims of the present invention.

Claims (5)

1. a fragile material compression test fixture, it is characterised in that: fixture mainly by upper centering rod (1), Lower centering rod (6), upper backup pad (2), lower supporting plate (4), upper holder block (3), lower lock block (7) and ball Shape seat (5) forms；Wherein go up centering rod (1), lower centering rod (6) and upper backup pad (2), lower support Plate (4) is threadably secured connection；Upper holder block (3) is threadably secured with upper backup pad (2) and is connected； Being connected by spheric seat (5) between lower supporting plate (4) and lower lock block (7), lower lock block (7) passes through screw thread Fixing connection spheric seat (5).

Fragile material compression test fixture the most according to claim 1, it is characterised in that: described is upper The shape specification of centering rod (1) and lower centering rod (6) matches with grip of testing machine.

Fragile material compression test fixture the most according to claim 1, it is characterised in that: described is upper Briquetting (3), lower lock block (7) are provided with center cast line, it is simple to sample centering.

Fragile material compression test fixture the most according to claim 1, it is characterised in that: under described Gripper shoe (4) is provided with spherical groove, and its size matches with spheric seat (5), and spheric seat (5) is in lower support In plate (4) spherical groove can minute movement, regulate lower lock block (7) angle of inclination, with sample during guarantee test Surface is parallel with upper holder block (3) surface.

Fragile material compression test fixture the most according to claim 1, it is characterised in that: described folder Tool each several part all uses mould steel.