Tear Strength - ISO 34-1
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The force required to tear a specified test specimen divided by the specimen thickness.
This test provides a measure of resistance to tearing. Tear strength may also be used to illustrate the anisotropy of a material.
Testing is performed by pulling specimens apart using a tensile test machine. Three methods are employed. Method A is preferred because it is not sensitive to the length of the cut in the specimen and test resuts are more easily related to the tear properties of the material. Method B (unnicked) measures a combination of tear initiation and propagation. Method B (nicked) and Method C each measure tear propagation.
| Method |
Specimen Name |
Diagram |
Grip Separation |
Test |
| A |
Trouser |
 |
100 mm/min |
 |
| B |
Angle
(nicked or unnicked) |
 |
500 mm/min |
 |
| C |
Crescent
(nicked) |
 |
500 mm/min |
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