SU1167474A1 - Device for testing tubular specimens - Google Patents

Description

The invention relates to the study of the strength of models of tubular elements made of brittle materials (concrete, reinforced concrete, stone and other materials) under various types of complex loading.

The purpose of the invention is to improve the accuracy of testing.

The drawing shows a device for testing tubular samples, 1 ° general view.

The device consists of a base

I and the holder 2 to accommodate the test sample 3. The holder 2 covers the hollow rod 4 outside and is mounted on it with the ability to move through its mechanism, made in the form of hydraulic cylinders 5, to the working position A and mounting position B. 20

In working position A, the ferrule 2, the elastic sheath 6, the base 1 and the stem 4 form a chamber 7 for creating external hydrostatic pressure on the test sample 3. 25

Between the base 1, the stem 4 and the test specimen 3, end loading disks .8 and 9 are installed. The base T, the stem 4 and the disks 8 and 9 are equipped with fastening elements 10 of the elastic sheath 6 made in the form of wire retaining rings.

The clip 2 is equipped with devices

II and 12, respectively, for the supply of working fluid into the chamber 7 and removal of air bubbles from it.

In order to create an internal hydrostatic pressure on the test sample 3, the device contains a chamber 43, made of an elastic shell 14 and mounted for attachment to disks 8 and 9.

In the places of fastening the shell 14 to the disks 8 and 9, the latter are equipped with 45

devices 15 and 16, respectively, for the supply of working fluid into the chamber 13 and removal of air bubbles from it.

I

Devices 11, 12, 15 and 16 can be made in the form of fittings and pipelines attached to them. The piping device 15 and 16 are placed in the internal cavities of the base 1 and stem 4 ·. 55

The base 1 is fixed on the fixed crossbar 17, and the rod 4 on the movable cross beam 18. The hydraulic cylinders 5 are attached to the holder 2 with clamps 19 on one side and to the mobile cross bar 18 by means of a finger 20 on the other side.

To ensure a stable hydrostatic pressure in the chamber 7, the ferrule 2 in the end parts is equipped with sealing elements 21.

In preparation for testing sample 3, set the holder 2 by means of hydraulic cylinders 5 in the mounting position B. Sample 3 is put on an elastic sheath 6. Elastic sheath 14 is passed into the internal cavity of sample 3, and the latter is placed between the disks 9 and 8. the holes of the disks under the device 15 and 16 and attach to them. This may be a mechanical fastening with the formation of the chamber 13. The devices 15 and 16 may be attached to the shell 14 before testing, for example, by gluing.

Sample 3, equipped with a chamber 13, diakey 8 and 9 with devices 15 and 16 and an elastic sheath 6, is installed on the rod 4 with simultaneous connection of devices 15 and 16 with the corresponding main pipelines.

The installed specimen is centered and the base 1 and stem 4 are brought together until the gap between the disk 8 and the base 1 is selected.

Then straighten the outer elastic sheath 6 and the overlapping of the joints between the disk 8 and the base 1, the disk 9 and the rod 4, followed by the imposition of fastening elements 10.

The holder 2 from the mounting position B is moved by means of hydraulic cylinders 5 to the working position A.

The device works as follows.

In the production of tests under conditions of a volumetric stress state, it is initially applied. An axial load necessary to compensate for axial thrust caused by the pressure of the working fluid in chambers 7 and 13 is applied to the sample 3. Then, through the devices 11, the working fluid is injected into the chamber 7 of the external hydrostatic pressure.

3

Air bubbles are removed through the device 12. Similarly, the working fluid is injected into the chamber 13 of the internal hydrostatic pressure through the device 15, controlling the release of air using the device 16. At the same time create an axial compressive load.

The hydraulic system is designed in such a way that the pressure in the chambers 7 and 13 is created autonomously and independently of the deformation of the sample 3.

one

1167474 4

The magnitude of the lateral pressure is fixed by the gauges of the hydraulic system of the installation (not shown). The magnitude of the axial compressive load is fixed with 5 force-measuring devices of the press (not shown).

The device is universal in terms of creating complex stress states, and loading 10 of the test specimen can be carried out under any combination of possible loads.

Claims (4)

1. A DEVICE FOR TESTING A TUBULAR SAMPLES containing a base with a holder for accommodating a test specimen, a movable rod with an elastic shell attached to it, connected to the base and forming with it, the hydrostatic pressure outer barrel, an elastic shell installed inside the first, fixed on the base and forming with it an internal hydrostatic chamber. pressure and line supplying the working fluid into the chamber, characterized in that, in order to improve the accuracy of testing, it is equipped with a mechanism for moving the yoke to the outer surface of the rod, loading discs to which the inner and outer elastic shells are attached and which are installed on the ends of the base and gdgk, moreover, the latter are made hollow and in them are placed the lines for supplying the working fluid to the internal _Λ chamber. 3 2. Device by π. 1, characterized in that it is equipped with a means of removal of air bubbles from the inner chamber. 3. The device according to PP. 1 and 2, characterized in that the yoke in the front parts is equipped with sealing elements. 5 (1 ,,,, 1167474 ι 1167474 2