SU405045A1 - DEVICE FOR TESTING POLYMER TESTER - Google Patents

Description

one

Apparatus for testing for tearing polymeric materials is known, comprising a device for fixing the angle of tear, clamps of sample ends, spring-type load cells and a sample tension control unit.

The purpose of the invention is to eliminate the dependence of the sample size and its fixation on the tear angle, as well as to improve the measurement accuracy.

This is achieved by the fact that the device for fixing the corner of the tear is made in the form of a pin of a hingedly connected rhombus, on which two opposite corners of the clamps are fixed, and also that the support of one of the springs of the load cell is fixed on the carriage by micrometer screw.

The drawing shows the proposed device, the overall appearance.

The testing device for tearing polymeric materials consists of pivotally connected strips 1 and 2, which form a rhombus and are attached to a pull 3 with a scale 4, which is connected to a loading mechanism. The bars 1 are L-shaped, on the short side of which spring force meters are fixed, including springs 5. The ends of one spring 5 are rigidly fixed on clip 6 and on the bar 1 by clamps 7, the ends of another

the springs 5 are fixed respectively on the clamp 6 and on the carriage 8 by the clips 7. The carriage moves by means of a micrometer screw 9 with a nut 10. The deflection of the springs 5 is measured by indicators 11. T ha 3 is equipped with a groove 12, along which the hinge 13 moves depending on the tear angle secured with a nut 14.

The device is equipped with three sets of springs 5

the same length but different stiffness. The device works as follows. The device is mounted in the sleeve of the lower clamp of the bursting machine. By moving the hinge 13 along a groove of 12 tons of gi 3, set the required angle of tear, which can be selected from 30-150 °. The tear angle is formed by the outer sides of the L-shaped plates 1 and is determined on a scale of 4. The cut along the specimen is secured with the untrimmed part in the upper grip of the tensile machine, and the cut-off portions of the specimen are directed strictly along the diamond 1 slats, also forming the set angle, and fix in the clamps 6. By activating the stroke of the bursting machine, a certain tension of the sample is created, while the indicators 11 show the magnitude of the loads. If the readings are different, the readings of the right indicator 11 are adjusted by increasing or

reducing the tension in the corresponding part of the sample when moving the carriage 8 and, consequently, the load cell with the micrometer screw 9 using the nut 10. Then again turn the screw of the tensile machine and readings of the indicators 11 are removed at the beginning of the tearing or other moments according to the test method rend To avoid stretching the specimen before the tear-up begins, specimens with a tissue substrate in the dissected part are used. The subject matter of the invention 1. A device for testing for tearing polymeric materials, containing a device for fixing the angle of tear, clamps of sample ends, spring-type load cells and a sample tension control unit, characterized in that, in order to eliminate the dependence of sample sizes and its fixation on the tear angle to improve the measurement accuracy, the device for fixing the tear angle is made in the form of a hingedly connected rhombus mounted on a mechanism connected to the loading mechanism; replays clips. 2. The device according to claim 1, characterized in that the support of one of the springs of the force meter is fixed on the carriage with the possibility of movement by means of a micrometric screw.

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