Analysis of Mechanical Properties and Stress Crack Behavior of HDPE Geomembranes by Laboratory Installation Damage Test
- Analysis of Mechanical Properties and Stress Crack Behavior of HDPE Geomembranes by Laboratory Installation Damage Test
- 오태환; Khan BA[Khan BA]; 전한용[전한용]; 박주희[박주희]; 류원석; 김성희[김성희]; 장용채[장용채]
- Issue Date
- POLYMER SOC KOREA
- POLYMER-KOREA, v.35, no.3, pp.203 - 209
- Two smooth and textured surfaced HOPE geomembranes (GMs) were cut into dumbbell shape and notched where depth of the notch produced a ligament thickness of 10% to 90% of the nominal thickness with the specimen at 10% interval. A series of laboratory simulation test for installation damage were carried out at different loading cycles on HDPE GMs in accordance with ISO 10722 test method and the effect of number of loading cycle on installation damage was compared. It was found that yield stress and elongation at yield point decreased gradually as the notch depth was increased. Both installation damaged and notched, GMs were used to understand stress crack behavior and this behavior was observed through NCTL test at 50 +/- 1 degrees C at different yield stresses immerging in pH 4 and pH 12 buffer solutions. Over 35% tensile load, GMs became vulnerable to stress cracking. Both damaged and notched GMs showed the same trend. Especially, notched GMs showed less strength than installation damaged GMs at every stress cracking test condition.
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