SU1523958A1 - Installation for testing specimens of materials for fatigue in bending - Google Patents

Abstract

The invention relates to a test apparatus, in particular to installations for testing samples of materials for flexural fatigue. The purpose of the invention is to expand the functionality by providing tests with a cyclic change not only of the location and length of the applied area, but also the magnitude of the applied load. The installation comprises a power frame 1 with grippers 2, 3 for samples 4, 5, transmitting elements of the loading mechanism 8 in the form of stops 6, 7, designed to interact with the samples, and a device for cyclically moving the stops along the axes of the respective samples, including a gear wheel 10, a gear rail 11 mounted rotatably in the plane of rotation of the wheel 10, and a reciprocating rotational movement mechanism of the wheel 10 having a gear rail 15, kinematically connected with the drive 12. When the wheel 10 turns, the rail 11 aets progressively and rotated alternately loading the samples 4, 5 by the difference of moments at the ends of the rack displacement at point along the length of the support. In sample 4, the increase in load is accompanied by an increase in the bend shoulder of the sample; in sample 5, the load increases with a decrease in the bend shoulder. 1 il.

Description

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load application, but also the magnitude of the applied load. The installation comprises a power frame 1 with grippers 2, 3 for samples 4.5, transmitting elements of the loading mechanism 8 in the form of stops 6.7, designed to interact with the samples, and a device for cycling movement of the stops along the axes of the respective samples, having a gear wheel 10, a gear rail 11 mounted rotatably in the plane of rotation of the wheel 10, and a reciprocating rotational movement mechanism of the wheel 10 including the gear rail 15, kinematically connected with the drive 12. When the wheel 10 turns, the rail 11 changes schaets progressively and rotated alternately loading the samples, 5 by the difference of moments at the ends of the rack displacement at point along the length of the support. On the sample, the increase in load is accompanied by an increase in the bend shoulder of the sample; in sample 5, the increase in load occurs with a decrease in the bend shoulder. 1 il.

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

The aim of the invention is to expand the functionality by providing tests with a cyclic change not only of the location and length of the zone of application of the load, but also the magnitude of the applied load.

The drawing shows an installation diagram, a general view.

The installation contains a force frame 1, grips 2 and 3 fixed thereto for samples 4 and 5, a loading mechanism in the form of transmitting elements in the form of stops 6 and 7 connected with the corresponding force springs 8 equipped with devices 9 for tensioning them a device for cyclical movement of the stops, including a gear pair — a gear wheel 10 and a gear rack 11, at the ends of which stops 6 and 7 are placed on the wheel 10 and can be rotated in the plane of its rotation; nd wheels 10, 12 comprising the drive kinematically associated therewith cam 13, crank k and a second toothed rack 15, interact with the wheel 10.

The installation works as follows.

Include the actuator 12 and through the eccentric 13 of the connecting rod 13 and the slats 15 tell the wheel 10 reciprocating rotation. When turning the wheel 10 counterclockwise (according to the drawing), the equality of the shoulders of the action of the springs

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five

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to dz p

five

8 is broken, the left shoulder is enlarged, which causes the rail 11 to rotate counterclockwise until the anvil 6 touches the sample surface. As the stop 6 moves toward the free end of the specimen, the force increases, the bending of the specimen by increasing the torque of the rail counterclockwise, and the shoulder of this force increases simultaneously. With the opposite rotation of the wheel 10, the arm force decreases on the sample, and the force decreases to the full unloading of sample 4. The rail 11 returns to the equilibrium position, and then continues to rotate clockwise and the support 7 loads the sample 5. Here, as it grows the force created by the stop 7 decreases the shoulder of the force bending the sample 5. When the wheel 10 is reversed, the stop 7 moves to the free end of the sample 5 with an increase in the shoulder effort and a decrease in this force to complete unloading of the sample 5.

Claims (1)

Invention Formula An installation for testing material samples for bending fatigue, containing a power frame, grippers placed on it, each of which is intended to fasten one end of a corresponding sample, and a loading mechanism in the form of force springs, devices for tensioning them and transmitting elements with accessories by the process of their cyclic movement along the axes of the respective samples, characterized in that. 15239586 that, with the aim of expanding functional-installed with the possibility of new possibilities by providing a company in the plane of rotation of the wheel, tests with a cyclic change by the mechanism of reciprocating and rotating not only the location and length of the movement zone of this wheel, but also transmitting the load lugs, applied load, it is equipped with a gear wheel installed at the ends of the gear rack, installed at the ends of the gear rack connected with the corresponding force frame, connected with a gear rack, and prizhinami.