SANS 182, SANS 6282 Torsion Twisting test for hard-drawn and high-tensile strength conductors cables, electric cables

ISO 7802: Metallic materials -- Wire -- Wrapping test equipment

ISO 7800: Simple torsion test

ISO 7801:  GOST 1579 Metal Wire Reverse Bend Testing Machine

1 Principle

A test specimen is mounted in a fixed chuck at one end and at the other end in a rotating chuck, and the specimen is twisted in this configuration until the sample breaks. The number of turns that the cable specimen is able to withstand before cable breakage is recorded and reported.

2 Apparatus

Two chucks, mounted with their axes in the horizontal plane, the first axis being free to rotate, and the second axis being fixed but able to slide backwards and forwards along the common axis.

3 Test specimen

One specimen of length at least 200 mm, cut at random from each sample

4 Procedure

4.1 Mounting of specimen

So grip the specimen in the chucks that the jaws are separated by a specified distance. As referenced in the relevant standard. lf necessary, apply an axial load to the second chuck, the load shall be just sufficient to prevent the specimen from kinking.

4.2 Test

Rotate the first chuck at a speed not exceeding one revolution per second until the number of turns as specified in the relevant standard are visible between the chucks or until the specimen breaks.

5 Evaluation

Record the number of turns per length specified in the relevant standard, or, in the event of breakage occurring before the number of turns specified in the relevant standard has been reached. the number of turns at breakage.

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