SU759902A1 - Apparatus for testing materials for impact compression - Google Patents

Description

The invention relates to the study of the strength properties of materials, in particular to devices for testing materials for shock compression.

Known vertical pick for testing materials for shock compression, containing ⁵ frame, guides placed on it for moving the projectile, the anvil, the trigger mechanism and the mechanism for preventing re-collision [1].

The disadvantage of this device is Ma- ¹⁰ gives to the striker pin by the speed pattern.

The closest in technical essence to the invention is an installation for testing materials for shock compression containing a drummer, an acceleration tube containing ¹⁵ drummers, a sample attachment unit located at the outlet of the tube, a chamber of compressed gas and powder separated by a diaphragm from the acceleration tube (2 ].

The chamber of compressed gas is a thick-walled cylinder, in the back of which there is a plug with a cavity for gunpowder (powder chamber). When a diaphragm breaks through, punch. . · ₂ ·. .

the nickname is accelerated by gases through the acceleration pipe and strikes from the departure. according to the sample. Acceleration of the striker with compressed air with pressure up to 150 at. allows to get a collision speed up to 450 m / s. To obtain higher speeds, the pressure in the chamber of compressed gas is increased due to the combustion of powder charges in the powder chamber. The highest energy efficiency of the powder is achieved with its complete combustion, which requires the choice of a membrane of a certain thickness.

• The disadvantage of this setup is the need for laborious operations of selecting the thickness of the membrane for different speeds of collision.

The aim of the invention is to reduce the complexity of the test.

This goal is achieved by the fact that the installation is equipped with a separating chamber of compressed gas and a powder with a second diaphragm, the parameters of which are chosen from the condition of its destruction during full combustion of gunpowder, and a mobile test for controlling the volume of powder 3 759902

measures. The chamber of compressed gas can be made folding.

FIG. 1 shows the installation diagram; in fig. 2 - the chamber of compressed gas in a folding position.

The installation contains a pipe 1 acceleration impact / Nick 2, reinforced using supports 3 on the base 4, the Assembly 5 sample mounting is attached to the muzzle 6. The acceleration pipe 1 is connected through the flange 7 with the chamber 8 of compressed gas, made in the form of a thick-walled cylinder, in front parts of which there is a slot for installing a diaphragm 9 separating the acceleration pipe 1 and the chamber 8 before the experiment. The diaphragm 9 is pressed by a flange 10 having a central opening 11, ensuring the exit of gases from chamber 8 when the diaphragm 9 is destroyed.

The powder chamber 12 is screwed into the back of chamber 8, screwing into chamber 8 and pressing diaphragm 13, which is destroyed by cutting through aperture 14 when gunpowder completely burns in chamber 12. The volume of powder chamber 12 is adjusted by screwing the plug 15 to a different depth.

The chamber 8 of the compressed gas is made folding with the help of the curtains 16 connected pivotally and welded to the flange 7 and the chamber 8.

To hold the chamber 8 in the folded down position, an emphasis 17 is provided that is welded to the frame 4. Compressed gas flows from a cylinder (not shown) through a flexible pipe 18 through an opening 19 into the chamber 8.

The installation works as follows.

When the set pressure in the chamber 8 is reached, in the powder chamber 12, an electric coil (not shown) ignites the powder, after burning which the diaphragm 13 collapses, allowing gases to enter the chamber 8. The pressure increasing in the latter causes the diaphragm 9. destruction begins. drummer 2, located before the experiment directly behind the diaphragm 9 (shown by the dotted line). After departure from the pipe 1, the striker 2 strikes the sample under test at the required speed.

The installation uses two diaphragms (9 and 13), each of which has the same thickness for the entire speed range. The thickness of the diaphragm 9 is chosen so as to withstand the pressure of only compressed gas.

The thickness of the diaphragm 13 is selected from the level of destruction with the complete combustion of gunpowder. “To increase the speed of drummer 2, it is necessary to increase the weight of the powder charge. With

5 maintaining the same charge density (the ratio of the weight of the powder and the unit volume of the powder chamber), which is achieved by changing the volume of the powder chamber 12 by unscrewing the plug 15, the maximum pressure in the powder chamber 12 does not change, which allows the diaphragm 13 to be of the same thickness.

Thus, the installation allows the use of diaphragms of the same thickness for obtaining different velocities of the striker, which eliminates the need for a significant number of preliminary experiments on the choice of the thickness of the diaphragm depending on the weight of the powder charge and significantly reduces

20 the complexity of the test.

Claims (2)

Claim 25 1. Installation for testing materials on shock compression, containing the hammer, the acceleration pipe, in which the hammer is placed, the sample attachment unit located at the pipe outlet, the compressed gas chamber and powder powder, separated by a diaphragm from the acceleration pipe, which is in order to reduce the labor intensity of testing, it is equipped with a separating chamber of compressed gas and a powder second diaphragm, the parameters of which 35 selected from the condition of its destruction with the complete combustion of gunpowder, and a movable stopper to regulate the volume of the powder chamber. 2. Installation pop. 1, characterized in that the chamber of compressed gas is made flip.