SANS 182: Torsion Twisting, Wrapping test of Conductors for overhead electrical transmission lines
ISO 7802: Metallic materials -- Wire -- Wrapping test equipment
ISO 7800: Simple torsion test
ISO 7801: GOST 1579 Metal Wire Reverse Bend Testing Machine
Specifies the method for determining the ability of wire of diameter or thickness 0,1 to 10 mm inclusive to undergo plastic deformation during wrapping. The test consists of winding a wire to a specified number of turns around a mandrel of the diameter specified in the relevant standard to form a closely wrapped helix. It may also include a specified sequence of windings and unwindings, or even rewindings.
Operation steps:
1， The sample should be tightly wrapped around the core rod at a constant speed of no more than one turn per second along the spiral direction without any twisting. If necessary, the winding speed can be slowed down to prevent temperature rise from affecting the test results.
2， During winding, a tension force not exceeding 5% of the corresponding force value of the nominal tensile strength of the wire can be applied to the free end of the sample.
3， If it is required to unwind or unwind before rewinding, the speed of unwind and rewinding should be as slow as possible to prevent temperature rise from affecting the test results.
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