SU1415123A1 - Centrifugal installation for testing specimens - Google Patents

Abstract

The invention is intended to test specimens for fatigue under cyclic stretching. The aim of the invention is to expand the types of applied loads by ensuring their cyclical change alternately along the load axes with changing load limits in proportion to the frequency of the cycles. The installation includes a base 1 with platform 2 and a drive 3 for rotation of platform 2, gear 4 mounted on base I. and wheel 5 mounted on platform 2 and connected to chamber 6. Centrifugal weights 9 are placed in chamber 6 on a direction 1i. 10 connected to the grippers 8 for sample 7. To cyclically change the load alternately along the load axes with varying load limits in proportion to the frequency of the cycles, the guides 0 of the centrifugal weights 9 are placed in a plane passing through the epanie axis of the platform 2. When the drive 3 is turned on the camera 6 rotates around the axis of the shaft II and the placement plane of the guides 10 rotates around the axis of rotation of the platform 2, with the result that the weights 9 create a lower load limit from the rotation around the axis of the shaft of the camera 6 and cyclic loading by rotating around the axis of rotation of the platform 2 when the guides 10 are placed in positions that do not coincide with this axis. I il. fS (L

Description

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: The invention relates to a test equipment and can be used to test samples for fatigue under cyclic stretching.

I The aim of the invention is to expand the ids of the applied loads by ensuring that they alternate cyclically along the loading axes with varying loading limits proportional to the frequency of the cycles.

 The drawing shows a diagram of a centrifugal plant for testing an image OBOB.

I The installation contains a base 1, a platform 2 installed on it with a drive – IIOM 3 rotation, a bevel gear 4, fixed on the base 1, a bevel gear | oleso, 5, installed on platform 2, | A sample 6 for placing sample 7 with grippers 8 and centrifugal weights 9 ho the number of directions of flat loading with guides 10 whose shaft 11 rotates -1 -1 connected to a conical wheel; ohm 5. The guides 10 of centrifugal weights 9 are placed in a plane The axis of rotation of the platform 2 is unobtrusive.

The bone of the arrangement of the guides 10 rotates around the axis O-O of rotation of the camera and the guides 10 alternately take a position perpendicular to the axis O-0. At the same time efforts from centrifugal

 loads, resulting from their rotation around the O-O axis, become maximal, oriented along the guides, and are added to the forces from the same loads that occur as a result of

10 rotate them around the axis of the shaft 11 of the chamber 6. On the sample 7 in the direction of the action of these loads, an increment of load occurs. With an increase in the rotational speed of the platform, the rotational speed of the camera and the lower limit of the pulsating load increase, as well as the frequency of the pulsations of the load and the magnitude of the load during the pulsations, i.e. the upper limit of the change of the pulsating load.

Claims (2)

20 Formula of Invention 15 A centrifugal unit for testing specimens containing a base, a rotary drive platform mounted on it and a pair of bevel wheels, the first ; The centrifugal unit for testing 25 of which are rigidly fixed on the basis of the samples works as follows. ; Drive 3 is turned on and the platform is turned. 2. Gear 5 | It runs around the fixed gear 4 and rotates the shaft 11 together with the camera 6 and different platform, the camera, the specimen grips placed in it and centrifugal weights with main guides, stretch Flipped by loads in it 9. Directions of applied loads by means of 10 rotating weights of the chamber shaft 11 and 10, 10 loads, and loads 9 by means of grips 8 load the sample with 7 centrifugal forces that create: stretch on specimen. When they are cycled alternately alternating along the loading axis is proportional to the frequency of the cycles, the guides are placed in a plane passing through the axis of the first wheel. The bone of the arrangement of the guides 10 rotates around the axis O-O of rotation of the camera and the guides 10 alternately take a position perpendicular to the axis O-0. At the same time efforts from centrifugal loads, resulting from their rotation around the O-O axis, become maximal, oriented along the guides, and are added to the forces from the same loads that occur as a result of rotating them around the axis of the shaft 11 of the chamber 6. On the sample 7 in the direction of the action of these loads, an increment of load occurs. With an increase in the rotational speed of the platform, the rotational speed of the camera and the lower limit of the pulsating load increase, as well as the frequency of the pulsations of the load and the magnitude of the load during the pulsations, i.e. the upper limit of the change of the pulsating load. Invention Formula on the platform, a chamber, the specimen grips arranged therein, and centrifugal weights with main guides, in order to expand The types of applied loads by ensuring their cyclical variation alternately along the loading axes are proportional to the frequency of the cycles, the guides are placed in a plane passing through the axis of the first wheel.