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DUCTILE-TO-BRITTLE TRANSITION TIME IN POLYETHYLENE GEOMEMBRANE SHEET
Citation:
Halse, Y., A. Lord, Jr., AND R. Koerner. DUCTILE-TO-BRITTLE TRANSITION TIME IN POLYETHYLENE GEOMEMBRANE SHEET. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-92/049.
Description:
The susceptibility of polyethylene (PE) geomembranes to stress cracking was evaluated in the laboratory using an accelerated notched constant load testing (NCLT) method. he test specimens were subjected to various stress levels which ranged from 25% to 70% of the yield stress at 50 degrees C. he ductile-to-brittle failure curves of five different geomembranes were obtained by plotting the logarithm of percent yield stress against the logarithm of average failure time. he stress cracking resistance (SCR) is quantified as the value of the ductile-to-brittle transition time. he result's show that SCR of these geomembrane sheets vary over a wide range from a minimum of 4 hours to over 600 hours.