Trapezoid tear test for Geotextiles, Tearing Strength of Geotextiles ASTM D4533. 

An outline of an isosceles trapezoid is marked on a rectangular specimen and cut. A small tear is introduced on one side of the specimen. The nonparallel sides of the trapezoid marked on the specimen are clamped in parallel jaws of a tensile testing machine. The separation of the jaws is initiated and increased so the tear propagates across the specimen. The force is measured throughout the test. 

Trapezoidal method:

Draw two diagonal lines at the ends of the strip to form an isosceles triangle in the middle and then cut at the bottom. Try to clamp and follow the two diagonal lines and add tensile loading. The first yarn that is close to the incision will bear more external force, while the other yarns will endure less force. When the first yarn experience cracks, it will split. Then the line below will become the first yarn. It will endure strong tension until tears apart. At last, the maximum force in the process is the tearing strength of the fabric. It is directly related to the tearing force, and is used to evaluate the tenacity of the fabric. The comparability and stability of the results are good, easy to measure and can be carried out in normal machine with general strength.

Number of Test Specimens: 10 machine direction 10 cross machine direction

Test Specimen Size: 3" x 8"

Keywords: Tearing, trapezoidal tear

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