SU1404817A1 - Hydraulic arrangement for measuring square of cross-section - Google Patents

Description

The invention relates to a measuring technique and can be used in mechanical engineering to determine the relative narrowing of the cross-sectional area of flat and other forms of specimens during their tensile tests.

The purpose of the invention is to measure the area in the process of stretching a sample.

The drawing shows the proposed device, the overall appearance.

The hydraulic device for measuring the sample cross-sectional area contains a liquid-filled vessel 1 with a lid 2, a sample attachment unit 3 on the bottom 5, a slug 6 with a central bore 7, rods 8 serving as piston guides and connecting it with a drive (not shown) ; a piston displacement meter 9 along the axis of the vessel 1, a differential pressure gauge 10, the inputs of which communicate with the vessel 1 along different

ten

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do the deformable sample 4 and the surface of the pressure 6. The pressure difference in the cavities is fixed by a manometer, and the position of the piston by the meter 9. The electrical signals from which are fed to the plotter of the electronic computer, where the sample area distribution curve is obtained. Then the piston 6 is returned to its original position.

In the process of stretching a sample, which is usually carried out with strain rates, which for samples with a working length of 50-100 mm is less than 0.1 mm / s, the linear velocity of the piston relative to the sample should be 1–2 times higher strain rates so that changes in the sample area over time do not affect the accuracy of the sample area measurement along its length.

Thanks to scanning along the length of

side of the piston 6, drawn from the second 20 sample, the device allows in the process

tests should be carried out from 10 to 60 area measurements along its length until the sample is destroyed.

sample fixing unit 11, fastened to the breaking machine 12.

The piston 6 is made with a connector along the diametral plane. Sample 4 is placed in the hole 7, the shape of which is similar to the shape of the sample. A pressure gauge 10 and a meter 9 form a reference unit associated with an electronic computer (not shown).

The device works as follows.

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Claims (1)

Invention Formula A hydraulic device for measuring the sample cross-sectional area containing a vessel filled with a liquid with a lid, a sample mounting unit on the bottom and a piston and a reference unit distinguishes between Sample 4, which can be any way so that it is installed in the vessel cavity to measure the area of the mold. stretching the sample, it is snabie secured at nodes 3 and 1 and secured in the nodes 3 and 11. The tug is attached to the tensile machine 12. Then install the piston rod 6 with the rods 8 to the initial upper end position, fill the vessel 1 with liquid, turn on the explosive machine, and move the piston 6 along sample 4 the area of measurement of the sample area. The movement of the piston causes the flow of fluid in the vessel 1 from one cavity to another, through the gap 35 A second specimen attachment unit, passing through the cover, is fitted with a central opening for placing the specimen and a connector along the diametrical plane at the end located in the housing, the specimen is mounted with a central opening, the inputs of which are communicated with the vessel different sides of the piston and piston displacement meter. do the deformable sample 4 and the surface of the pressure 6. The pressure difference in the cavities is fixed by a manometer, and the position of the piston by the meter 9. The electrical signals from which are fed to the plotter of the electronic computer, where the sample area distribution curve is obtained. Then the piston 6 is returned to its original position. In the process of stretching a sample, which is usually carried out with strain rates, which for samples with a working length of 50-100 mm is less than 0.1 mm / s, the linear velocity of the piston relative to the sample should be 1–2 times higher strain rates so that changes in the sample area over time do not affect the accuracy of the sample area measurement along its length. Thanks to scanning along the length of Invention Formula A hydraulic device for measuring the sample cross-sectional area, containing a vessel filled with liquid with a lid, a sample mounting unit on the bottom and a piston, and a reference unit, characterized in that, in order to measure the area in the sample stretching process, it provides A second specimen attachment unit, passing through the cover, is fitted with a central opening for placing the specimen and a connector along the diametrical plane at the end located in the housing, the specimen is mounted with a central opening, the inputs of which are communicated with the vessel different sides of the piston and piston displacement meter.