Summary of Test
ASTM D4533 is a test method that determines the tear strength of geotextiles by the trapezoid procedure using a constant-rate-of-extension-type (CRE) tensile testing machine. Tear strength is the capacity of a material to withstand the tearing force required to propagate a tear after its initiation. The trapezoid tear produces tension along a reasonably defined course such that the tear propagates across the width of the specimen. The method can be used to analyze the relative tear resistance of different fabrics or different directions in the same fabric.
Before conducting ASTM D4533, it is important to read the entire specification in the relevant ASTM publication.
Recommended Equipment
Testing Procedure
- Prepare the trapezoid test specimens as described in the method.
- Set the distance between the clamps at 25 ± 1 mm (1 ±05 in). ADMET recommends the use of a scale or calipers to measure this distance.
- Zero the load and position.
- Adjust the grip faces such that the contact region on each grip is aligned vertically when fully closed. Any misalignment may cause erratic or skewed data.
- Clamp the trapezoidal fabric test sample in the upper and lower grips per the ASTM specification.
- Select the load range of the testing machine such that the maximum load occurs between 15 and 85% of full-scale load. It is recommended that the maximum force exerted on the sample occurs between 15% and 85% of the full scale load of the load transducer being used.
- Set the machine to operate at the speed specified in the standard.
- Press Start on the controller and record the tearing force.
Just Ask!
Questions about running ASTM D4533 on your system?
