The Notched Constant Tensile Load Test method for environmental stress cracking test of geomembrane is mainly evaluated by simulating the resistance of materials to chemical corrosion under specific stresses. The following are the main test points and operation steps:
Test principle:
The stress cracking resistance of the material was evaluated by observing the cracking of the specimen in the surfactant under constant tensile load.
Test method:
1. Sample preparation
Dumbbell-shaped specimens were cut from the geomembrane with a size of 2×150×50 mm and an incision depth of 80% of the nominal thickness.
The thickness of the specimen is measured, and the error is not more than ±0.025mm.
2. Test conditions
Temperature: 50°C±1°C, surfactant is a mixture of 10% nonylphenol ethoxylate (TX-10) and distilled water.
13.8 MPa tensile stress was applied, and the solution was kept homogeneous by stirring continuously.
3. Test Steps
The specimen was placed in a thermostatic surfactant and the breakage time was recorded.
Observe the cracking at the incision, calculate the fracture time or quantify the ESC index.
Notes:
The test should be conducted at 23°C±2°C, and the specimen should be completely immersed in solution.
The depth of the cut needs to be precisely controlled, and the equipment needs to have an accuracy of 0.01mm.
After the test, it is necessary to check whether the specimen meets the thickness deviation requirements (±0.025mm).
