SU1490575A1 - Rig for impact testing of material specimens - Google Patents

Abstract

The invention relates to testing equipment, devices for testing samples of materials for strength under shock loading. The purpose of the invention is the expansion of technological capabilities by providing a shock interaction between two samples with adjustable loading parameters. The stand contains a device for lifting and dumping cargo, made in the form of a ring of ferromagnetic material, mounted on an axis, driven by an electric actuator 4. Levers 5 and 6 freely move on an axis in parallel planes with stationary weights 9, 10 fixed in the same plane with samples 11, 12. Electromagnetic coils are installed at the ends of the levers to interact with the ring and move the cargo with the sample to the calculated height, when disconnected, samples are struck, stuffed with anvils 13, 14 and drummers 15-18. The magnitude of the impact, the repetition of the impact after the rebound, the interaction of one or another pair of ends of the samples is carried out by switching on and off one of the coils of each lever at a constantly rotating ring 3. 2 Il.

Description

The invention relates to a test apparatus, to installations for testing samples of materials for strength under shock loading.

The purpose of the invention is to expand the functionality by providing impact interaction not only on one specimen but also between two specimens with adjustable loading parameters.

Fig, 1 shows the installation, the general view; in fig. 2 - scheme of the installation.

The installation contains a base 1, in which axis 2 is located with a ring 3 mounted on it, connected with rotational drive 4. Ring 3 is made of magnetic material. On axis 2, levers 5 and 6 are installed with the possibility of rotation in parallel planes, at the ends of which electromagnetic coils 7 and 8 are fixed for interaction with ring 3. Weights 9 and 10 are fixed at opposite ends of the levers. On the levers between weights and electromagnetic coils, Samples 11 and 12 with anvils 13 and 14 are fastened in the same plane and drummers 15–18 are installed at the ends of each.

Stegad works as follows.

The rotary actuator 4 is turned on and the ring 3 is rotated with the coil 8 de-energized. 1. If turning the ring 3 together with it, the lever 5 rotates and at that moment when the position of the lever 5 corresponds to the calculated impact force, provide the coil 7 on the lever 5. Lever 5 under the action of the weight of the load 9, it makes a further turn and the shock interaction between samples 11 and 12 occurs. Upon impact, the lever 5 slows down movement, the lever 6 moves in the direction of impact and rises by a certain amount. If the collisions after the rebound are not necessary according to the test program, then at this moment the coil 8 is turned on and the lever 6 rises together with the ring to the initial vertical position.

With the coil 8 not turned on, shock repeated damped interactions between samples occur. To reload, after the damping of the collisions, the coil 8 is turned on and the lever 6 is lifted to the shock position. De-energizing the coil 8 at the calculated moment, the interaction between the samples is struck, and if the lever crosses the vertical line at the moment the coil disconnects, then the interaction occurs during the collision samples with other ends than with the previous loading, and if the lever 6 did not cross the vertical line, v, then turning it under the action of the load 10 occurs opposite to the rotation of the ring and the collision between the samples dit on the sides participating in loading before.

Thus, repeated collisions of samples with different impact forces are made, which is controlled by the position of the levers before disconnecting the corresponding coil, with or without rebounds, when loading different ends of the samples. During the tests, load and unloading diagrams of the samples, a diagram of their destruction and the nature of the destruction are recorded. The capacity of the plant and the loading speed are regulated by the weight of the weights and the location of the weights and the anvils on the levers: as the weight of the load increases and the radius of its rotation increases, the power increases, the loading speed increases with increasing sample rotation radius.

Claims (1)

Invention Formula A bench for impact testing of sample materials, containing a base, a rotational drive, a load for interacting with the sample, a device for lifting and dumping the load, placed on the base, an anvil for the sample;) and a drummer, characterized in that by providing impact interaction not only on one sample, but also between two samples with adjustable loading parameters, the stand is provided with an additional load by two levers arranged in parallel planes and connected with corresponding weights, additional anvils for the second sample and three drummers and the axis, the impactors are designed to interact with the opposite sides of the respective samples, the device for lifting and dumping the load is made in the form of two electromagnetic coils and a ring of magnetic material mounted on the axis and connected to the rotational drive, and the levers mounted on the axis can be rotated around her Compiled by I. Grinev Editor K. Krupkina Tehred M. Didyk Proofreader O. Tsiple Order 3747/50 Circulation 789 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and publishing plant Patent, Uzhgorod, st. Gagarin, 101 Fiz.g Subscription