SU1422098A1 - Bed for dynamic tests of specimens for strength - Google Patents

Abstract

This invention relates to a testing technique. The aim of the invention is to expand the operational capabilities by ensuring that a tensile load is applied to the test sample when the compressive load reaches a predetermined value. The stand comprises a frame 1 with vertical guides 2, a hammer 3 made in the form of a gear anvil 4, grips 5 and b for securing sample 7, a drive for rotating the anvil 4, a gear 12 connected to the upper grip 5, a pusher 13, elastic anvil 4 mounted on guide pins 16, coupled with gear wheel 12 and anvil 4, torsion springs 17, connecting gear 16 with frame 1, and hammer lifting drive 18 3. By means of an actuator for rotating anvil 4 into springs 17 store energy for ck uchivayuschego subjecting the sample. When the hammer 3 strikes the pusher, the sample 7 moves downwards and at a given load, the anvil 4 disengages from the gears 16, as a result of which a torque load is applied to the sample 7. 1 il. S cl

Description

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The invention relates to testing equipment, in particular, to stands for the dynamic testing of material samples for strength under the action of compressive and torsional loads.

The purpose of the invention is to expand the operational capabilities by ensuring that a test load is applied to a test specimen when the compressive load reaches a predetermined value, which is released from one of the grips at a given load and from the gear that transmits torque. load to sample.

 The drawing shows the proposed stand for dynamic testing of samples of materials.

The stand contains a frame 1 with vertical} 1 tangles 2, placed in the guides of the hammer 3, mounted in the lower part of the frame 1 rotatably with the anvil 4, made in the form of a gear wheel, and clamps 5 and 6 for securing Test Sample 7. The bottom the gripper 6 is rigidly connected to the anvil 4. The stand also includes a drive for rotating the anvil 4, comprising a motor 8, a chain gear 9 with bristles 10 and a shaft 11 connected to the anvil 4 and mounted axially relative to the pinion 10, a gear wheel 12 hard associated with the upper gripper 5, arranged in the guide 2 pusher 13 associated with the upper gripper 5 through the gear 12, the elastic suspension of the anvil. 4, made in the form of an anvil 14 and a compression spring 15, located between the end of the shaft 11 and the anvil 14, mounted on the guides 2 rotatably of the annular teeth 16, coupled to the gear wheel 12 and the anvil 4, torsion springs 17, connecting the scissors. 16 with frame 1 and drive 18 for raising hammer 3.

Stand for dynamic testing of samples of materials operates as follows.

The motor 8 is turned on and through the chain gear 9 and the shaft 11 rotates the anvil 4. At the same time, the gear 16 rotates and the springs 17 are twisted, from which elastic energy is stored in the loading system to tighten the sample 7. Together with the gear 16, the gear wheel 12 and the clamps rotate 5 and 6 with specimen 7. In this case, the twisting load is not applied to the specimen 7. Upon reaching the specified deformation of the springs 17, the engine 8 is turned off. The actuator 18 lifting hammer 3 raises it to a predetermined height and reset it. Hammer 3 pushes the top grip 5 through the pusher 13 and the bristle 12. The axial load acting on the sample 7 is transmitted to the anvil 4. The spring 15 at the same time

The sample 7 is deformed and grips 5 and 6, the gear wheel 12 and the anvil 4 move down along the gears 16. As the sample 7 moves along the gears 16, the compressive load in it increases until the anvil 4 comes out of engagement with the gears 16. At the same time the gear

16 rotated by springs

17 and load the sample 7 through the gear,. wheel 12 and upper grip 5 with a twisting load. With further movement of the sample 7, the compressive load continues to increase with the simultaneous action of the twisting load up to the destruction of the sample 7.

5 To change the twisting force, the angle of twist of the springs 17 is changed. The compressive load is adjusted by changing the initial height of the anvil 4 and changing the stiffness of the spring 15.

The rate of compressive loading is varied by varying the height of the hammer 3.

For sample test 7 for pure compression, the drive for rotating the anvil 4 is not

5 use. For pure torsion tests, do not use elastic anvil suspension 4.

Storing energy for loading the sample with a twisting load in the springs 17, preliminary rotation of the grips 5 and 6 together with the brush 16 and release of the anvil 4 from engaging with the brush 16 with a given compressive force allows testing under joint, but not simultaneous, impact of two loads .

5 At the same time, the stock of energy in loading systems is regulated individually for each type of load.

Claims (1)

Invention Formula 0 Stand for dynamic testing of samples of materials for strength under the action of compressive and torsional loads, containing a frame with vertical guides, placed in a guide plate, installed in the lower part of the frame with the possibility of rotation of the anvil, grips for securing the test sample, the lower of which rigidly connected with the anvil, and a drive for rotating the anvil, characterized in that, in order to enhance the operational capabilities by ensuring that a rotating load is applied to the test specimen When the compressive load reaches a predetermined value, it is provided with an anvil placed in guides of the pusher associated with the upper grip mounted on the guides with the possibility of turning with a spur 1422098 34 torsion springs, coupled to the gears, and the anvil of the gears with the frame, and rigidly connected snapshots in the form of a gear wheel, the upper grip gear, coupled to the gears.