ISO 9073-4 Test methods for nonwovens, determination of tear resistance. ASTM D 5587-96 Tearing strength of fabrics by Trapezoid procedure.
This test is used to investigate the tear resistance of fabrics by the trapezoid specimen shape method. This method provides valuable information about a fabric’s ability to resist a continuous tear from sharp objects. In principle, the test specimen is cut in the shape of an isosceles trapezoid and then a small cut is made on one side of the trapezoid. This specimen is then supported as defined in the standard by clamping of the non-parallel sides of the trapezoid in the jaws of a tensile testing machine. The application is to pull at a continuous increasing extension (constant rate of Extension) the test piece in such a way that a tear propagates across the specimen width as the jaws move
