SU989371A1 - Plant for testing specimens for axial loading under hydrostatic pressure conditions - Google Patents

Description

The invention relates to a technique for testing materials, namely to testing samples under conditions of a complex, stressful state.

A known device for testing specimens for simultaneous stretching and torsion, containing hydraulic strain used to load the specimen with a torque, and a press used to stretch sample Cl

The disadvantages of the installation are the complexity of its design, which is due to the use of two loading drives, as well as the lack of means to carry out tests under hydrostatic conditions.

Closest to the proposed technical essence and the achieved effect is an installation for testing samples for axial load under hydrostatic pressure conditions, which contains a working chamber, two coaxially arranged plungers installed with axial displacement and intended to interact with the sample, and axial loading means plungers. Plungers

interacting with the sample, are additionally interrelated with each other

However, this installation of xaoaicTepH is due to the impossibility of additional loading of the samples with a torque.

The purpose of the invention is the implementation

10 loading also torque

This goal is achieved by the fact that in an apparatus for testing specimens for axial load under hydrostatic pressure conditions that exclude the working chamber, the

5 there are two coaxially arranged plungers installed with the possibility of axial re-charging and intended for interaction: with the sample, and the means of axial loading

20 plungers, on the outer plunger: a screw groove is made with a lift “, the inner plunger is made with the fingers in contact with the groove, and the angle is chosen from

25

R. N.

Jepig-

Claims (2)

where A is the twist angle of the sample H is the absolute sediment deformation of the specimen / D is the diameter of the inner plunger. In addition, the installation is equipped with interchangeable bushings having various slots for lifting grooves fixed to the outer plunger. The drawing shows an installation with a replaceable sleeve for testing samples for axial load under 1strostatic pressure conditions. The installation contains a working chamber 1 filled with a liquid medium, two coaxially arranged plungers 2 and 3 installed with axial displacement and intended for interaction with sample 4, mounted on plunger 2, replaceable sleeve 5, in which a screw groove b is made with a lift angle cc selected from the square ft.hiiboi TCDtg-oL where p is the angle of rotation of one sample head 4 is different; D is the diameter of the inner plunger 3; And - absolute axial deformations of sample 4, fingers 7 fixed on the inner plunger 3 and in contact with the chuck b, and means (not shown) of axial loading of the plungers 2 and 3. The installation works as follows. When compressed by plunger 2 into chamber 1 of the liquid medium, the latter acts on the lower end of plunger 3. As a result of this effect, the plug 3 moves upward and stretches the sample 4 attached to it. At the same time, the fingers 7 move in groove b and rotate the plunger 3 around the vertical axis. In this case, the sample is experiencing torsion. If the compression of the liquid medium in chamber 1 is carried out by plunger 3, then sample 4 will experience torsion and compression under hydrostatic pressure conditions. Equipping the installation with a number of replaceable sleeves with different groove lifting angles makes it possible to obtain different ratios of the values of 1 and H and to construct a plasticity diagram. At the same time, the minimum values of the angles of angles, for example, for grooves of a rectangular section, must exceed the value of the friction angle. The apparatus allows the specimens to be tested under the simultaneous effects of axial loads (tension or compression), torsion and hydrostatic pressure. At the same time, there is no individual drive in the installation for creating torsion, which greatly simplifies the operation of the installation. Claims 1. An apparatus for testing samples for axial load under hydrostatic pressure conditions, comprising a working chamber, two coaxially arranged plungers arranged in it with axial displacement and intended to interact with the sample, and means for axial loading of plungers, so distinguished that, in order to implement the loading also with a torque, a screw groove with a lifting angle of 6L is made on the outer plunger, the inner plunger is made with the fingers in contact and, s.paz, and the angle at is chosen from the condition TCDig-ot A r - the twist angle of the specimen; Vl is the absolute axial strain of the sample; D is the diameter of the inner plow2. A pop-1 installation, characterized in that it is provided with interchangeable, having different angles from the elevation of the grooves, sleeves fixed on the outer plunger. Sources of information taken into account in the examination 1. Factory laboratory, 1959, 6, p.25. 2. Authors certificate of the USSR 416591, cl. G01N 3/10, 1971 (prototype).