what's tear strength test by trapezoidal method for Geosynthetics, 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. 

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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