SU1364952A1 - Arrangement for testing tubular specimens for twisting under conditions of hydrostatic pressure - Google Patents

Description

(21) 4104890 / 24-28

(22) 08/07/86

(46) 07.01.88. Bul № 1

(71) Kaunas Polytechnic Institute Antanas Snechkus

(72) I.I.Dul vicus, S.P. Zhed fox, P.Yu.Zilukas and A.P. Vicus

(53). 176.24 (088.8)

(56) Methods and instruments for mechanical testing of polymer materials; Rostov: Rostov-on-Don publishing house, 1979, p. 1 14.

(54) DEVICE FOR TESTING TUBULAR SAMPLES FOR TURNING IN CONDITIONS OF HYDROSTATIC PRESSURE

(57) The invention relates to equipment for the mechanical testing of materials and can be used for testing tubular specimens made, for example, from polymers, for torsion under hydrostatic pressure conditions. The aim of the invention is to improve the accuracy of the IC

torture. Sample 4 with active 2 and passive 3 grippers is placed in chamber 1. In this case, passive gripper 3 is connected with the torque measurement sensor 5, sleeve 6 with the screw through slot 7 and the core 9 of the sensor 8 for measuring the twist angle through the spline joint 10. In chamber 1 is pressurized. The active gripper 2 rotates from the torsion mechanism, rotates the sample 4 and rotates the passive gripper 3 on the hub 6. In this case, the torque moment is fixed by the sensor 5. When the gripper 2 rotates, the core 9 moves progressively and rotates simultaneously with the gripper 3 reduces the amount of its linear movement by the amount of rotation of the passive grip. The linear movement of the core 9 becomes directly proportional to the angle of twist of the sample 4. 2 Il.

with

(L

with a

4ib CO SL

to

Rig 1

The invention relates to equipment for the mechanical testing of materials and can be used in tests of tubular specimens made, for example, from polymers, in torsion under hydrostatic pressure conditions.

The aim of the invention is to improve the accuracy of the tests.

Figure 1 shows the diagram of the device; 2 is a section A-A in FIG. I.

The device comprises a chamber 1 with the creation system: pressure (not shown), coaxially active 2 and passive 3 grippers placed in the chamber for fastening the test sample 4, associated with active twisting mechanism gripping 2 (not shown), associated with passive gripping sensor 3 5 measuring the torque moment placed in the chamber 1 and connected with it, with its end, the sleeve 6 with the screw through slot 7 in its middle part, the second end of the sleeve 6 associated with the passive gripper -3, the induction sensor 8 measuring the angle of twist core 9 to This is set coaxially to the sleeve 6, the passive gripper 3 and the sample 4. The core 9 is connected with the passive gripper 3 by means of a spline joint 10, which provides for their relative reciprocating movement and joint rotation, and interacts with the active gripper 2 by means of a thread 11 made on core 9 and active engagement 2.

The device works as follows.

Camera. 1 after installing sample 4 with grippers 2 and 3 in it, it is filled with a working medium with a predetermined pressure P. The torsion mechanism is activated, which rotates the active gripper 2 at a certain angular velocity and torsion moment Mcr, thereby twisting sample 4 and loading sleeve 6 The rotation of the end of the loaded sleeve 6 with the passive gripper 3 is converted into translational movement and measured by the torque measuring sensor 5. At the same time, the rotational movement of the active gripper 2 is sensed by the core 9 of the inductive

five

0

five

0

five

0

five

0

five

The sensor 8 for measuring the twist angle and through the thread 11 it is converted into a forward movement of the core 9, since the latter is connected to the passive grip 3 with only axial movements through the spline connection 10. However, some rotation of the passive grip 3 occurs, equal to the rotation of the corresponding end of the sleeve 7 , which leads to a corresponding rotation of the core 9. Thereby, the values of its total displacement are reduced by the amount of rotation of the gripper 2, and the displacement of the core 9 becomes directly straight portional twist angle of the sample 4 and the detector 8 is stopped.

Due to the coaxiality of the sleeve 6 with the active gripper 2 and the placement of the core 9 coaxially with the sample 4, the effect of technological errors in the manufacture and boring of these parts on the measurement results is minimal.

Claims (1)

Invention Formula A device for testing tubular torsional specimens under hydrostatic pressure conditions, comprising a chamber with a pressure generating system, coaxial active and passive grippers placed in the chamber for attaching the test specimen, associated with an active gripping torsion mechanism, a twist angle measurement sensor and a twist measuring sensor moment associated with a passive gripper, characterized in that, in order to increase the accuracy of the test, it is equipped with a screw-through sleeve placed in the chamber coaxially with the grippers cutting in its middle part, one end of the sleeve is connected with the camera, and the second - with a passive grip, the twist angle measurement sensor is made induction, and its core is placed coaxially with the sleeve and the passive grip, the latter is connected with reciprocating movement and joint rotation and interacts with the active grip through the thread, which is made on the core and active grip. / 7- / 7