GB/T 4909.4-2009 Test methods for bare wires—Part 4:Torsion test

Scope

This part of GB/T 4909 specifies the test equipment, specimen preparation, measurement steps, test results, and evaluation for the torsion test of bare wires.
This part is applicable to the determination of the torsion performance of round-section conductors with a nominal diameter d of 0.300 mm to 10.00 mm, such as copper, aluminum, and their alloys, as well as conductors with special cross-sections (such as contact wires) with a characteristic dimension a ≤ 20.00 mm.
In this part, a specimen of a specified length is twisted about its own axis until it breaks or reaches a specified number of twists.
This part should be used in conjunction with GB/T 4909.1—2009.

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