SU1439461A1 - Installation for fatigue tests of group of specimens - Google Patents

Abstract

The invention relates to a pushing technique and allows testing groups of material samples for fatigue at various frequencies of force. The purpose of the invention is to increase accuracy by eliminating the transition period of tests from one frequency to another. The loading device consists of 2, 4 cam mechanisms arranged in parallel by the number of pairs of grippers, each of which is made up of 7–10 jaws in series in series with various steps of projections 11–13. Their interaction and communication with the corresponding stop devices of instantaneous action allow a sample from the group to be tested on its own program of change without a transitional period of force applied to them by successive release from the rigid connection by the stoppers of the corresponding cam program and all the fixed stops. other cam connections. one

Description

The invention relates to a testing technique, in particular, to devices for testing materials for fatigue materials at different frequencies of force.

11, the spruce of the invention is to improve the accuracy by eliminating the period from which the tests pass from one frequency to another.

The drawing shows the scheme of the proposed installation.

The installation includes a housing 1, passive grippers 2 samples 3, mounted in housing 1, active grippers 4 designed for emarking on samples 3, a loading device with a drive 5 of vara1ce-n1 and power springs 6 placed between the corresponding active grippers 4 and loading. device, and the loading device is made in the form of parallels.: installed according to the number of pairs of grippers 2 and 4 cam mechanisms, each of which is made in the form of

thirty

The successively connected end cams 7-10 with distinct pushes of their protrusions 11-13 and associated stoppers consist of, for example, an electromagnetic coil 14 and a core 15 placed respectively on the adjacent end cams. The loading device is connected to cam mechanisms by means of a toothed cylindrical gear with wheels 16-18, and the end cams 10, associated with force springs 6, installed on housing 1 with the possibility of only axial movement and spring loaded by us 19.AQ

The installation works as follows.

Samples 3 are placed in saxpriTax 2 and 4 and include a rotation actuator 5. In this case, samples 3 are used. force action with the frequency provided by the non-stopping face cam connection. Other cam connections are locked by electromagnetic interaction between the corresponding electromagnetic coils 14 and the cores 15 connected to the current source (not shown) and when the tests are transferred from one frequency to another almost simultaneously without a transition period, the operating end cam connection is stopped by connecting the corresponding electromagnetic coil to the current source and release the other cam connection from the hard connection by disconnecting the corresponding electromagnetic cable tabs from the power source. In this setting allows testing of each sample group on its own program changes a force on them frequencies.

35

Formula of invention

Adjustment for fatigue testing of samples of specimens, comprising a body, passive and active specimens for specimens installed in it, a rotating loading device and strong springs placed between the loading device and the corresponding active grips, in order to improve accuracy by the elimination of the transition period of the test from one frequency to another, the loading device is completed in the form of cam mechanisms by the number

The cam mechanisms are assembled from a pair of grippers, each of which has a number of face cams, which is complete as a series of connectors that correspond to a given programmed face cams with different tests of the number of frequencies by the power steps of their protrusions and the associated effect on the sample 3.c They correspond to the stoppers.

ten

25

, Aq

394612

Samples 3 are placed in saxpriTax 2 and 4 and include a rotation actuator 5. In this case, samples 3 are used. force action with the frequency provided by the non-stopping face cam connection. Other cam connections are blocked by electromagnetic interaction between the corresponding electromagnetic coils 14 and the core 15 connected to the current source (not shown). When testing passes from one frequency to another, the end face cam connection joins the corresponding electromagnetic coil almost without transition period. to the current source and release from the rigid connection another cam connection by disconnecting the corresponding electromagnetic to a carcass from a current source. With this setting allows testing of each sample group on its own frequency changing program force acting on them.

15

20

Claims (1)

Claim Installation for fatigue, testing of groups of samples, comprising a housing, passive and active grippers for samples installed in it, a loading device with a rotation drive and power springs placed between the loading device and the corresponding active grippers, characterized in that, in order to increase accuracy by eliminating the period of transition of tests from one frequency to another, the loading device is made in the form of cam mechanisms according to the number of pairs of grippers, each of which is made in the form of sequentially end cams with different steps of their protrusions and associated respective stoppers.