CN103175733B - Direct tensile test jag of incompressible material - Google Patents

Abstract

The "direct tensile test jig for incompressible materials" of the present invention belongs to the field of building material test devices. The invention is composed of a fixed joint, an adapter chuck, a connecting plate, a bolt and a metal rod, and solves the problem of data distortion or even falling off caused by slippage of the specimen at the clamping end during the direct tensile test of the existing incompressible material. For the problem that the test cannot be completed, it can reliably realize the direct tensile test of incompressible materials to accurately obtain the mechanical performance parameters of such materials, which has certain application prospects.

Description

Direct Tensile Test Fixtures for Incompressible Materials

technical field

The invention belongs to the technical field of building material testing devices, and in particular relates to reliable clamping and loading of specimens during direct tension tests of incompressible materials.

Background technique

The existing material tensile test device - universal testing machine, the clip body is generally made of high-quality medium carbon steel, alloy structural steel, or its mechanical properties can be improved by appropriate heat treatment process. The clamping methods of the fixture mainly include wedge type, pair clamp type, bolt type and so on.

The advantages of these fixtures are:

1. Reliable clamping, no slippage;

2. The tolerable test force is relatively large.

However, when it is used for incompressible materials, there are some problems in the above-mentioned conventional clamping method: because the incompressible material is directly clamped due to large deformation, the clamping end slips and the test data is distorted, and even falls off when the deformation is too large Therefore, the test cannot be completed.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and discloses a direct tensile test device suitable for incompressible materials, which provides a reliable clamping method for the direct tensile test of incompressible materials, so as to obtain accurate incompressible It is possible to compress the material parameters of the material.

Technical scheme of the present invention is:

A tensile test fixture, suitable for direct tensile tests on incompressible materials, is characterized in that the structure of the tensile test fixture is composed of two units in a symmetrical relationship up and down, and each part of the unit includes a fixed joint, an adapter Collets, connecting plates, bolts, metal rods, of which (the above parts are examples):

The fixed joint has a hole at its upper end, which is connected to the testing machine through the hole, and its lower end is a threaded rod;

The adapter chuck is composed of upper and lower sections, the upper section has a threaded hole, the threaded hole is connected with the threaded rod of the fixed joint, and the lower section is a thin rod, and the thin rod has a hole in the horizontal direction;

Holes are opened on the upper and lower sides of the connecting plate, and every two connecting plates are symmetrically arranged on both sides of the thin rod of the adapter chuck. The connection between the connection plate and the adapter clip;

The two ends of the test piece are respectively wound on the metal rod, and the test piece and the metal rod are sandwiched between the lower ends of the two connecting plates as a whole, and connected in the lower hole of the connecting plate through the metal rod.

Compared with the prior art, the present invention has the following advantages:

Compared with the prior art, the invention provides a reliable clamping method for the direct tensile test of the incompressible material, and no slippage of the clamping end occurs during the test, which guarantees the accuracy of the test result. Due to the threaded connection between the parts, it can be guaranteed that no rotation will occur, and at the same time, it can be disassembled. The invention solves the problem that the test cannot be completed due to the slippage of the test piece at the clamping end during the existing direct tensile test of the incompressible material, and the device of the present invention can reliably realize the direct tensile test of the incompressible material. Tensile test, in order to accurately obtain the mechanical performance parameters of this kind of material, has a certain application prospect.

Description of drawings

Figure 1 is a schematic diagram of the overall structure and installation of the tensile test fixture.

Figure 2 is a schematic diagram of the connection plate structure.

Marking description: fixed joint 1, adapter chuck 2, connecting plate 3, hole 31 on the connecting plate, hole 32 under the connecting plate, bolt 4, metal rod 5, test piece 6.

Detailed ways

The technical solution of the present invention will be further introduced below in conjunction with the accompanying drawings.

The tensile test jig of the invention is suitable for direct tensile tests on incompressible materials, has reliable clamping, and does not slip. As shown in Figure 1 and Figure 2, the structure of the tensile test fixture is composed of two parts that are mutually symmetrical up and down, and each part is composed of six parts, namely the fixed joint 1, the adapter chuck 2, and the two connecting parts. Plate 3, bolt 4, metal rod 5. The connection of the six parts in the above part is introduced as an example, among which:

The upper end of the fixed joint 1 is connected with the testing machine (not shown in the figure) through a metal rod (not shown in the figure), and the lower end of the fixed joint 1 is connected with the adapter chuck 2 through a threaded rod;

The upper section of the adapter chuck 2 has a threaded hole, which is connected with the threaded rod of the fixed joint 1, and a hole with a diameter of 8mm is opened on the thin rod of the lower section;

The two connecting plates 3 are symmetrically arranged, and holes are opened up and down. The upper end of the connecting plate 3 is connected to the lower thin rod of the adapter chuck 2 through the bolt 4 (the diameter of the bolt 4 is 8 mm), and the lower end is connected to the test piece 6 through the metal rod 5 .

The two ends of the test piece 6 are respectively wound on the upper and lower metal rods 5 for loading.

That is, the static structure is characterized by:

The structure of the tensile test fixture is composed of two units with a symmetrical relationship between the upper and lower parts. Each unit includes a fixed joint 1, an adapter chuck 2, a connecting plate 3, a bolt 4, and a metal rod 5. Among them:

The fixed joint 1 has a hole at its upper end, which is connected to the testing machine through the hole, and its lower end is a threaded rod;

The adapter chuck 2 is composed of upper and lower sections, the upper section has a threaded hole, and the threaded hole is connected with the threaded rod of the fixed joint 1, and the lower section is a thin rod, and a hole is opened in the horizontal direction of the thin rod;

The connecting plate 3 is provided with holes up and down, and every two connecting plates are symmetrically arranged on both sides of the thin rod of the adapter chuck. Through to realize the connection between the connection plate and the adapter clip;

The two ends of the test piece 6 are respectively wound on the metal rod 5, the test piece 6 and the metal rod 5 are sandwiched between the lower ends of the two connecting plates 3 as a whole, and the metal rod 5 is connected to the lower hole 32 of the connecting plate 3 Inside. Take a completed PVB material as the test object, and carry out the direct tensile test as an example to illustrate the specific operation method of the device of the present invention.

1. First, fix the fixed joint 1 on the testing machine (not shown) with a metal rod (not shown in the figure);

2. Connect the end of the adapter chuck 2 with the small-diameter thread to the fixed joint 1 through the thread, and pay attention to the alignment during the connection process;

3. Connect the other end of the adapter chuck 2 with the two connecting plates 3 on its side through bolts 4;

4. Then connect the two connecting plates 3 at the lower end in the same order;

5. Wrap the upper and lower ends of the test piece 6 (that is, PVB material) on the metal rod 5 respectively, and hang the test piece 6 between the upper and lower connecting plates 3 through the metal rod 5, and start the test.

After the test is completed, the disassembly sequence is reversed to the above assembly process.

Claims (1)

1. a tensile test fixture, be applicable to, to the direct tensile test of incompressible material, it is characterized in that, the structure of this tensile test fixture by up and down symmetrically two parts unit of relation form, every unit comprises fixture splice, adapter clamp, web joint, bolt, metal bar, wherein:

Upper part cellular construction is:

Described fixture splice, its upper end perforate, is connected on testing machine by this hole, and its lower end is threaded rod;

Described adapter clamp is made up of two sections, and its epimere opens threaded hole, and this threaded hole is connected with the threaded rod of fixture splice, and its hypomere is thin bar, and the horizontal direction of thin bar offers hole;

Described web joint all offers hole up and down, and every two web joints are symmetrically arranged in the thin bar both sides of adapter clamp, the thin bar aligned of hole and adapter clamp on web joint, and by bolt through with the connection realized web joint and adapter clamp;

Test specimen two ends are wrapped on metal bar respectively, and test specimen and metal bar entirety fold up between described two web joint lower ends, by metal bar cross-under in the lower hole of web joint;

Lower part cellular construction and described upper part cellular construction full symmetric.