SU1408290A1 - Arrangement for testing rod-type specimens of materials for twisting - Google Patents

Abstract

The invention relates to a testing technique and can be used to determine the characteristics of the mechanical properties of materials in torsion. The aim of the invention is to discover the capabilities of the device. on by providing a layered circle - O (L 00 to QP

Description

sample with the movement of the deformation wave along its length. The device comprises a base 1, a holder 2 fixed on it with longitudinal grooves 3 having curved sections 4. In the holder 2 a package of bushings 4 with trunnions 6 mounted so as to move along the grooves 3 is placed. The grips 7 of sample 8 are fixed in the holes of the bushings 5. The hydraulic cylinders 9, 10 are fastened on the sleeves 2, in the cavity of the rods 12 of which additional rods 13 are located. The working fluid under pressure is supplied in the cavity of the rods 12 and the piston cavities of the hydraulic cylinders 9, 10. Then in the piston cavity of one of the hydraulic cylinders 9, 10 Bonding, causing the rods 12 to move with the package of sleeves 5. The trunnions 6, moving along the groove, turn the sleeves 5 with the grippers 7, while twisting the sample 8, 2 or more.

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The invention relates to testing, engineering and can be used to determine the characteristics of the mechanical properties of materials in torsion.

The aim of the invention is to increase the capability of the device by providing layer-by-layer torsion of the sample with movement of the deformation wave along its length.

FIG. 1 shows the proposed

device, general view; in fig. 2 is a section A-A in FIG. one. . ,

The device contains a base 1,

Closed on it fixed frame 2 with longitudinal grooves 3, having curved sections 4. Inside the cage 2 is placed a package of bushings 5 with pins 6 installed in the grooves 3 with the ability to move along them. The sleeves 5 are pivotally mounted relative to each other, and in the holes of the sleeves 5, the clamps 7 of sample 8 are rigidly fixed, made in the form of rings covering the sample 8. At the ends of the yoke 2, the cylinders 9 and 10 drive the axial movement of the package of sleeves 5 In the cylinders 9 and 10, pistons 11 are installed with hollow rods 12 interacting with the ends of the package of bushings 5. Additional rods 13 are located in the cavity of the rods 12 and interacting with the ends of sample 8. For supplying the working fluid under pressure to the hydropy ivod device is provided with a pumping station 14.

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The device works as follows.

The working fluid under pressure is supplied from the pumping station 14 into the cavities of the rods 12, providing axial loading of the sample 8 with the help of additional rods 13. At the same time, pressure is created in the piston strips of hydraulic cylinders 9 and 10, pressing

 the rods 12 to the ends of the package of sleeves 5. Then, in the piston cavity of one of the cylinders 9, 10, the pressure increases, causing both rods 12 with the package of sleeves 5 to move along the axis of the cage. The trunnions 6 move along the grooves 3 and, alternately, the curvilinear section 4 passes, the sleeves 5 are rotated with the grips 7 of the sample 8 secured in them, thereby twisting the sample 8 layer by layer. After the sleeves 5 leave the curved section 4 on the straight section of the groove 3 8 turns out to be subjected to alternating twist deformation. The deformation of sample 8 can be repeated by moving it in the opposite direction. Depending on the configuration

Q curvilinear section 4 of the groove 3 The deformation of the sample in the forward and reverse directions can be symmetrical or asymmetric.

To deform sample 8 in one direction, groove 3 is made

5 of the two straight sections, turned relative to each other relative to the holder 2 and connected by a curvilinear section.

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Claims (1)

Invention Formula The device for testing torsional rod samples of materials containing the base, grips in the form of coaxially arranged rings to cover the sample and the mechanism of the mutual rotation of the grips, which means that In order to increase the capabilities of the device by providing a layer-by-layer torsion of the sample with movement of the deformation wave along its length, the mechanism of mutual rotation of the grippers is made as fixed on the base of the cage with longitudinal through grooves having curvilinear sections placed inside the clip Packs of bushings with axles installed in the grooves with the ability to move along them, drive axial movement of the bushings pack in the form of two hydraulic cylinders with pistons coaxially with it, hollow rods, the ends of which interact with the ends of the bushings pack, and located in the cavity x of these rods of additional rods, the ends of which are designed to interact with the ends of the specimens and bushings the bags are pivotally mounted relative to each other, and the grippers are rigidly fixed in the openings of the sleeves. fig.g