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Flexure Endurance

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$940.00
ASTM B470 AS5382 Method 3.5 AS6324 Method 5.1.9 EN3475 Method 512 ICEA S 81-570 Method 7.1 ISO 19642-2 Method 5.3.4 MIL-DTL-32630 Method 4.7.7 MIL-DTL-49055G Method 4.7.12 MIL-DTL-83413 Method 4.7.14 MIL-PRF-85045G Method 4.7.5.4
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The flexibility of a wire/cable is dependent on a combination of the conductor and insulation constructions. Conductors with more strands are often better able to endure flexing without breaking. More rigid insulations can place additional strain and also crack during flex testing.

The flexure endurance test (or cyclic bending in the ISO standard) evaluates the wire/cable’s ability to withstand flexing on a tight mandrel. The flexing performed in this test is very severe and the results should only be considered for comparative analysis and not an estimate of in-service longevity (test parameters can be adjusted to better reflect in-service conditions).

In this test, the specimen is flexed 180Deg between two mandrels until there is a break in electrical conductivity of the conductor. The pass/fail criteria is based on the particular specification, typically set at a minimum threshold for the number of flexing cycles with conductor loss.

Parameters that can be changed for this test include:

  • Mandrel diameter
  • Weight on specimen
  • Number of trails

Note that there are significant procedural differences between the European and SAE flex test methods. Information and pricing on the SAE test can be found here.

Our Process
1
Visually examine the specimen and record any observed defects.
2
Measure the specimen diameter and install the properly sized mandrels into the test fixture.
3
Cut three specimen and crimp each end.
4
Install the specimen into the test fixture and place specified weight on samples.
5
Attach continuity monitoring equipment on the specimen.
6
Start flex test jig. Continue the flex test until all specimen have failed.
7
Report the cycles to failure for each specimen, mandrel diameter, cycles per minute, and weight on the specimen.