SU1420451A1 - Apparatus for testing specimens in uniaxial loading - Google Patents

Abstract

The invention relates to testing equipment and devices for mechanical testing of samples under uniaxial static and cyclic tension-compression. The purpose of the invention is to improve the informativity of tests by allowing the registration of crack growth by ensuring the immobility of the cross section under study, as well as expanding the functionality by ensuring the compression of the sample. Sample 9 is installed in coaxial grips 7 and 8, associated respectively with pistons 5 and 6. When the sample is compressed, piston 6 is lowered and piston 5 rises symmetrically. When the sample is stretched, piston 5 is lowered and piston 6 rises symmetrically, which ensures immobility during the test of the test section. 1 il.

Description

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The invention relates to testing equipment, devices for mechanical testing of samples under uniaxial static and cyclic tensile compression.

The purpose of the invention is to increase the informativity of the tests by providing the possibility of registering the growth of a crack by ensuring the immobility of the test section, as well as expanding the functionality by providing compression of the sample.

Nut 12 set on the sample initial load, for example zero. Include the appropriate drive. When the piston 5 is moved down (sample stretching), the medium moves the piston 6 up. Similarly, when piston 6 is moved down (sample compression), piston 5 moves up. Due to the equality of the areas of the pistons 5 and 6, their movements will be equal

The drawing shows a diagram of the device.

Capacity closed in the form of a cylinder with

the gap between the outer 2 and inner 3. g

surfaces filled with medium 4, having 5 p, Q magnitude and opposite direction, coaxial guides with pistons 5 and 6, while the central (test) cross-axle grippers 7 and 8 for sample 9 are fixed on the corresponding pistons x 5 and 6 on the side of the inner surface 3 by means of coaxial rods 10 and 11. The pistons 5 and 6 20 are installed, respectively, on the side of the inner 3 and outer 2 surfaces of the cylinder 1 with the possibility of axial movement, and their surfaces, the normals of which are directed to one, contact the medium

The design of sample 9 will retain its position, which makes it possible to record the development of a crack in the section under study.

Claims (1)

Invention Formula A device for testing samples under uniaxial loading, containing two coaxial grippers, two pistons, with each the side. The rod 10 is fixed at one end 25 of which the corresponding grip is connected, and on the piston 5, at its other end a grip 7 is fixed through the nut 12. The rod 11 is fixed at one end to the piston 6, at its other end a grip 8 is fixed through the dynamometer 13. Piston 5 It is connected through an additional rod 14 and a latch 15 with a tension actuator 16, and a piston 6 through an additional rod 17 and a latch 18 with a compression actuator 19. . thirty a container filled with medium with coaxial grippers guides in which pistons are mounted for movement, one of the surfaces of each of which contacts the medium, characterized in that, in order to increase the informativeness of the tests by providing the possibility of registering the growth of the crack by ensuring the immobility of the section being studied as well as expanding the functionality by ensuring the immobility of the cross section under study, as well as expanding the functional possibilities by providing sample, it is equipped with two coaxial grippers attached to the respective pistons opposite each other by rods, each of which has a corresponding gripper fixed, the capacity is closed, and the pistons have equal areas and their surfaces contact the medium, normal to which the side. The device works as follows. Sample 9, having a concentrator for crack initiation, is fixed in grips 7 and 8, if it is necessary to perform off-center loading, with the required displacement of the center of the specimen relative to the axis of the grips. If necessary, testing the tensile test with latch 15 binds an additional rod 14 with a tension drive 16. And latch 18 is released. If necessary, test the compression sample retainer 15 is released, and the latch 18 binds the additional rod 17 to the compression actuator 19. If cyclic loading is required, the additional rods 14 and 17 are connected by means of clamps to the actuators 16 and 19, which operate in a cyclic extension-compression mode. Nut 12 set on the sample initial load, for example zero. Include the appropriate drive. When moving the piston 5 down (stretching the sample), the medium moves the piston 6 up. Similarly, when piston 6 is moved down (sample compression), piston 5 moves up. Due to the equality of the areas of the pistons 5 and 6, their movements will be equal  . g 5 p, Q magnitude and opposite directions, while the central (test) section, Q magnitude and opposite directions, while the central (test) cross section of sample 9 will retain its position, which allows you to record the development of cracks in the studied cross section. Invention Formula A device for testing samples under uniaxial loading, containing two coaxial grippers, two pistons, with each which is associated with a corresponding grip, and 5 which is associated with a corresponding gripper, and 0 five 0 a container filled with medium with coaxial grippers guides in which pistons are mounted for movement, one of the surfaces of each of which contacts the medium, characterized in that, in order to increase the informativeness of the tests by providing the possibility of registering the growth of the crack by ensuring the immobility of the section being studied as well as expanding the functionality by ensuring the immobility of the cross section under study, as well as expanding the functional possibilities by providing sample, it is equipped with two coaxial grippers attached to the respective pistons opposite each other by rods, each of which has a corresponding gripper fixed, the capacity is closed, and the pistons have equal areas and their surfaces contact the medium, normal to which the side.