SU1490531A1 - Rig for impact testing of articles - Google Patents

Abstract

The invention relates to a testing technique and can be used for impact testing of products. The purpose of the invention is to increase the duration and peak value of a reproducible shock pulse. The contour of the window 6, made in the muzzle of the barrel 3 of the device for forming a shock pulse, with the side surface of the barrel 3 adjoins the channel of the additional barrel 8, in which the insert 7 moves, connected to the platform 1 mounted outside the trunks 8 and 3 for fastening the tested product 2. By introducing an additional barrel 8, it is possible to increase the gas exposure time on the insert 7 after the piston 5 passes by the window 6 and thereby increase the duration and peak value of the reproduced shock pulse. 1 il.

Description

The invention relates to test equipment, namely, test benches for impact testing of products.

The purpose of the invention is to increase the duration and peak value of the recovered shock pulse.

The drawing shows the structural scheme of the stand, top view.

The stand contains a platform 1 for fastening the test article 2, a device for forming a shock pulse, comprising a barrel 3, a piston 5 placed in it and fixed in the initial position by a trigger mechanism 4, a pressure source (not shown) made in the muzzle of the barrel 3 an insert 7 installed in it, associated with platform 1, located outside the trunk 3. The stand is provided with an additional trunk

8, the channel of which is coupled with the lateral surface of the barrel 3 along the contour of the window 6. The platform 1 is mounted on the rails 9. The stand contains a trap 10 of the piston 5 and is mounted on the base 11. A hole 13 is provided for connecting the pre-piston cavity 12 to the pressure source. The bench also contains a trap 14 of platform 1, a braking platform 1 after the impact of a shock pulse.

The stand works as follows.

The test article 2 is fixed on the platform 1. The piston 5 is mounted in the barrel 3 at a predetermined distance, which ensures a given speed, and is fixed in this position by the trigger 4. The compressed gas from the source is pressed (not shown) through the hole 13

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Piston cavity 12 of the barrel 3. When a predetermined pressure is reached, the trigger mechanism 4 triggers and releases the piston 5, which, moving in the barrel 3, accelerates to a predetermined speed in the barrel 3 section to the window 6. In the piston 5 acceleration portion the platform 1 is in a state of rest, since only atmospheric pressure acts on it. In the course of the movement of the piston 5 at the length of the insert .7, the increasing force from the gas pressure accelerates the piston 5. As the piston 5 moves, the area of the insert 7 affected by the pressure of the gas increases, so the force acting on the insert 7 and the associated platform 1 also increases, reaching a maximum by the time the piston 5 of the insert 7 finishes passing. The platform 1 moves on the guides 9. The presence of an additional barrel 8 provides directional movement during the entire time the gas pressure is applied to If insertion eliminates gas leakage into the atmosphere through the gap formed between barrel 3 and insert 7, which prevents distortion of the parameters of the generated shock pulse. When piston 5 leaves barrel 3, compressed gas is discharged into the atmosphere, and consequently, a sharp decrease in force from pressure and gas to insert 7. During the passage of piston 5 of the length of insert 7 and as it leaves barrel 3, a shock pulse is generated that acts on the subject product 2. In addition, the duration of the trailing edge of the pulse depends on the ratio of the lengths

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trunk 3 after the window to the muzzle and additional trunk 8.

After the piston 5 leaves the barrel 3, it is braked by a trap 10, made, for example, in the form of dampers and inertial masses (not shown) placed alternately in the direction of movement of the piston 5.

Platform 1 is braked by a trap 14, performed, for example, similarly to a trap 10.

By introducing an additional bore 8, it is possible to increase the exposure time without loss of the increased pressure driving the piston 5 to the insert 7 after the piston 5 passes by the window 6, and therefore increase the duration and peak value

reproducible shock pulse.

Claims (1)

Claims for an impact test stand of an article containing a platform for attaching a test article and a device for generating a shock pulse including a barrel, in the muzzle of which a window is installed, an insert in the window connected to a platform located outside the barrel is placed in the barrel a piston fixed in the initial position by a trigger mechanism, a pressure source connected to the piston bore chamber, and a piston trap, o t characterized in that, in order to increase the duration and peak value of the reproducible shock pulse, it is provided with an additional barrel, the channel of which is associated with the lateral surface of the barrel along the contour of the window.