SU1388751A1 - Installation for testing material samples for strength - Google Patents

Abstract

The invention relates to a test apparatus, in particular to installations for testing samples of materials for strength. The aim of the invention is to expand the types of testing by providing stepwise destruction of the sample over the cross section by tensile loads. Sample 7 is destroyed successively by sequentially applying a load through a series of grippers 5 and 6 pivotally interconnected, fixed to the lateral surfaces of sample 7 through the device 17. The tensile loads on the grips 5 and 6 are created by winding flexible moving the grippers to the blocks 2 and 3 mounted on the housing 1 rotatably with respect to parallel axes in opposite directions. The rotation of the blocks 2 and 3 is ensured by the progressive movement of the gear racks 12 fixed on the rod of the double-acting hydraulic cylinder 10 due to their engagement with the gear wheels of the blocks 2 and 3. 1 sludge. I (L 00 00 00 ate

Description

The invention relates to a test apparatus, in particular to installations for testing samples of materials for strength.

The aim of the invention is to solve test types by providing stepwise destruction of the sample over the cross section by tensile loads.

The drawing shows an installation diagram which comprises a housing 1, blocks 2 and 3 mounted thereon with parallel axes of rotation and connected to drive 4, which ensures their rotation in opposite directions. Grips 5 and 6 are made in the form of a series of dasharniarno connected plates for fastening them on opposite side surfaces of the sample 7o. The mechanism for moving the grips 5 and 6 is executed in the form of two flexible tubes 8 and 9, fixed at one end on blocks 2 and

3 with the possibility of winding on them, and others on the grippers 5 and 6, Drive

The rotation of blocks 2 and 3 is made in the form of a hydraulic cylinder 10 of double-sided action, on the rod of which a table 11 with gear racks-12 is fixed on its side surfaces. The rails 12 engage with gear wheels (not shown) rigidly mounted on blocks 2 and 3 coaxially last. Hydraulic cylinder 10 is connected to pump station 13 via pressure accumulator 14 and valves 15 and 16. Fastening grips 5 and b to sample surfaces 7 carried out by means of the device 17.

The installation works as follows.

When the valve 15 is closed by means of a pumping station 13, pressure in the pressure accumulator 14 is opened, serfKoib 15 is opened, and the pressurized fluid moves the cylinder of the hydraulic cylinder 10 and the table 11 fixed on it in the direction of the blocks 2 and 3. The racks 12 fixed on lateral

ten

15

20

25

thirty

35

40

45

and 3 in opposite directions so that block 2 is rotated counterclockwise and block 3 is clockwise. As a result, flexible rods 8 and 9 are twisted on blocks 2 and 3 and first transfer the tensile force to sample 7, first through the first pair of plates grips 5 and 6 directly connected to rods 8 and 9, then after the destruction of part of sample 7 through the second pair of plates and so on until the sample 7 is divided into parts. Measuring devices (not shown) register the load on sample 7 and the course of development of the fracture crack, which began its movement from the notch at the end of sample 7. After the sample 7 is destroyed by pumping station 13, table 11 is returned to valve station 11 and blocks 2 and 3, A new sample with grips and experiment is repeated at the new speed of movement of the table 11. For this purpose, the rate of flow of fluid from the accumulator 14 through the valve 15 is changed.

Claims (1)

Invention Formula An installation for testing the strength of material samples, comprising a housing with two blocks installed on it with parallel axes of rotation, a drive associated with the blocks and intended for their rotation in opposite directions, grips for the sample and gripping movement mechanism that, in order to expand the types of testing by providing stepwise destruction of the specimen over the cross section by tensile loads, the mechanism for moving the grippers is made in the form of two flexible tg, each of which has On the corresponding block, and on the corresponding gripper, each of which is made in the form of a series of hinged plates designed to fix the surfaces of the table 11, rotate the blocks of 2 false surfaces x sample. 0 five 0 five 0 five and 3 in opposite directions so that block 2 is rotated counterclockwise, and block 3 is clockwise. As a result, flexible rods 8 and 9 are wound on blocks 2 and 3 and first transmit the tensile force to sample 7, first through the first pair of gripping plates 5 and 6, directly connected to the rods 8 and 9, then after the destruction of part of sample 7 through the second pair of plates, and so on until the sample 7 is divided into parts. Measuring devices (not shown) register the load on sample 7 and the course of development of the fracture crack, which began its movement from the notch at the end of sample 7. After the sample 7 is destroyed by pumping station 13, table 11 is returned to valve station 11 and blocks 2 and 3, A new sample with grips and experiment is repeated at the new speed of movement of the table 11. For this purpose, the rate of flow of fluid from the accumulator 14 through the valve 15 is changed. Invention Formula An installation for testing the strength of material samples, comprising a housing with two blocks installed on it with parallel axes of rotation, a drive associated with the blocks and intended for their rotation in opposite directions, grips for the sample and gripping movement mechanism that, in order to expand the types of testing by providing stepwise destruction of the specimen over the cross section by tensile loads, the mechanism for moving the grippers is made in the form of two flexible tg, each of which has on the corresponding block, and on the corresponding grip, the other, each of which is made in the form of a series of hinged plates designed to fix