Measurement of winding wire elongation

The determination of elongation of winding wire mainly includes two important indicators of elongation at break and tensile strength.

Elongation is the ratio of the increased length to the original length; tensile strength is the ratio of the breaking force to the original cross-section when the conductor is broken.

The measurement of winding wire elongation requires the use of extensometer or Tensile Testing Machine.

Method for determination of winding wire elongation

(1) The determination of elongation at break requires stretching a relatively straight sample with a free test length of 200-250mm at a rate of (5±1) mm/s on an extensometer or Tensile Testing Machine until the conductor breaks point, and then calculate the ratio of the linear increment of the length at break to the free test length, and express it as a percentage.

(2) The tensile strength test is performed on an extensometer or Tensile Testing Machine, and a straight sample with a free test length of 200-250 mm is also stretched at a rate of (5±1) mm/s until the sample breaks point, and record the breaking force at break.

The results of the elongation of the winding wires represent

(1) Elongation at break

Measure 3 samples, record 3 test values, and take the average as the elongation at break.

(2) Tensile strength

Measure 3 samples, record the original section and 3 breaking force test values, and take the average value of the breaking force and the ratio of the original section as the tensile strength.