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Specifications
Cold Bend Test ApparatusCold Bend Apparatus
This test is intended in general for cores of circular cross-section having an external diameter up to and including 12.5 mm and for sector-shaped cores when it is not possible to prepare dumb- bells.
The apparatus shall be held in a refrigerator before and during the test.
The diameter of the mandrel shall be between 4 and 5 times the diameter of the test piece (see below).
The mandrel shall be uniformly rotated at a rate of one revolution in about 5 s and the number of turns shall be as specified in the following table:
|
Overall diameter (d) of the test piece (mm) |
of turns Number |
d:2.5 |
10 |
d:(2.5-4.5) |
6 |
d:(4.5-6.5) |
4 |
d:(6.5-8.5) |
3 |
d:more then 8.5 |
2 |
The actual diameter of each test piece shall be measured by either a vernier calliper or a measuring tape. For sector-shaped test pieces, the minor axis is taken as the parameter equivalent to the diameter for determining the mandrel diameter and the number of turns.
For flat cords, the mandrel diameter shall be based on the minor axis dimension of the test piece, which is wound on with its minor axis perpendicular to the mandrel.
Conforms To: IEC60811-1-4 clause 8.1
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