SU1562753A1 - Centrifugal installation for testing samples of materials - Google Patents

Abstract

The invention relates to testing equipment, in particular to installations for fatigue testing of samples of material in circular bending. The purpose of the invention is to enhance the functionality by providing tests both at a constant and automatically controlled angle during the loading process between the bend planes of the sample areas. The installation comprises a housing 1, an end gripper 3 of sample 4, kinematically associated with a rotational drive 5, active grippers 6 and 7 associated with centrifugal loads 13 of the loading mechanism, also including a rotation drive 8, platforms 9 and 10, interacting with the loads 13, kinematically associated with each other and with the drive 8, and the mechanism of reciprocal rotation of the platforms 9 and 10, including the coaxial platform 15, the gear wheel 16 and the latches 17, 18. The angle between the bend planes of the sample areas changes as the platforms 9 rotate each other and 10 when intermediary m platform retainer 17 relative to the housing 15 is inhibited. 1 hp f-ly, 1 ill.

Description

The invention relates to a testing technique, in particular to centrifugal installations for testing samples of materials for fatigue under circular bending.

The aim of the invention is to expand the functionality of the installation by providing tests both at a constant and automatically controlled angle during the loading process between the bend planes of the sample areas.

The drawing shows the proposed installation, the overall appearance.

The installation contains a GT-shaped case 1, a vertical shaft 2 placed in the opening of its crossbar, at one end of which an end gripper 3 of sample 4 is installed, and the other is kinematically connected to a drive 5 of shaft rotation, two active grippers 6 and 7 of the sample in the form of ball bearings, the loading mechanism in the form of two concentrically placed coaxially to the shaft 2 and kinematically connected to each other and the drive 8 platforms 9 and 10, on the surface of each of which is mounted a stand 11 with a platform 12 and placed on it with the possibility of movement centrifugal load 13, associated with a corresponding active gripper 6 (7) th 14, and a mechanism for reciprocating the platforms 9 and 10, including a third platform 15 coaxial with them, a gear wheel 16 mounted on it, designed for kinematically communication of the inner 9 and outer 10 platforms made with toothed surfaces of external and internal engagement, respectively; latches 17 and 18 of platform 15 with respect to housing I and with respect to mold 9, respectively; and an actuator 8 connected to platform 9.

Clamps 17 and 18 are made in the form of electromagnetic coils with bark, frictionally interacting with the platform 15 and the housing 1.

The installation works as follows.

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For tests at a constant angle between the bend planes of sample 4, the latch 18 connects platform 15 to platform 9. The drive 5 rotates the end gripper 3 and the drive 8 rotates the platform 9. The platforms 9 and 10 rotate at equal speeds, the centrifugal weights 13 create forces on grippers 6 and 7 and bend sample 4 in two planes with an unchanged angle between them. The rotational speed of the end gripper 3 is changed relative to the rotational speed of the platform 9 and thereby the sample is loaded with a circular bend when deformed in two planes.

For tests with adjustable variation of the angle between the sample bending planes, the Latch 18 is turned off and the latch 17 is turned on, as a result of which the platform 15 stops rotating, the gear wheel 16 rotates relative to the platform 15 and reciprocally rotates the platforms 9 and 10. The loads 13 with the platforms 9 and 10 are mutually rotated, the directions of the centrifugal forces created by them and the angle between the bend planes of the sample are changed. When the specified angle between the bending planes of the sample is reached, the Latch 17 is turned off and the latch 18 is turned on, after which the platforms 9 and 10 again rotate at equal speeds.

At a constant reciprocal rotation of the platform 9 and JO, a mode of two-frequency circular bending of the sample is obtained, one frequency of which is determined by the speed of rotation of the end gripper 3 relative to the platform 9, and the second is the rotation speed of the platform 10 relative to the platform 9.

Claims (1)

1. A pentroplate test set to test a sample of materials, comprising a housing, a shaft placed in it with a drive for rotating it, an end gripping sample installed at its end, a pair of active sample grippers made in the form of ball bearings, and a loading mechanism including a coaxial shaft for the shaft, kinematically centrifugal weights, one of which is connected to the platform, connected to the drive and connected to the respective active grippers. characterized in that, in order to expand the functionality by providing tests both at constant and controlled at the angle of loading between the planes between the bending planes of the sample areas, it is equipped with a second rotary drive and the second kinematically connected with this drive a platform installed concentrically with the first plate of the plate and the mechanism of the azimon of the rotation of both plate feeds, and the other centrifugal load is connected with the second platform. about tl and h and - the purpose of pov2. Installation according to claim 1, so that, from the test performance by automating the process of changing loading modes, the mechanism of mutual rotation of the platforms is made in the form of a third platform mounted on the jfcopnyce coaxially with the first two platforms placed on it of a gear wheel for the kinematic connection of the two first plates between each other, and two clamps of the third platform relative to the housing and the first platform respectively.