This test determines the resistance of wire insulation to cracking at low temperatures while being bent around a mandrel. Using a special cold chamber, we can condition the specimen at the low temperatures that can be experienced during flight and study how it reacts to extreme conditions. This is a very good way to determine if the wire sample would be able to survive at these typical temperatures. At the end of the test, we will examine for any visible cracks, then perform a wet dielectric test for assurance.
Cold Bend Test
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Sample is secured to a rotatable mandrel in a cold chamber and the other end to the load weight.
Condition the wire/cable at -65° ± 2° C for 4 hours unless otherwise specified.
Wrap specimen helically around the mandrel without opening the chamber.
Remove the sample from the cold chamber and return to room temperature.
Perform visual examination of sample.
Perform wet dielectric voltage withstand test.