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Analysis of Mechanical Properties and Stress Crack Behavior of HOPE Geomembranes by Laboratory Installation Damage Test  

Khan, Belas Ahmed (Department of Textile Engineering, Inha University Graduate School)
Park, Ju-Hee (Department of Textile Engineering, Inha University Graduate School)
Kim, Sung-Hee (Department of Clothing and Textiles, Chonnam National University)
Chang, Yong-Chai (Division of Ocean System Engineering, Mokpo National Maritime University)
Oh, Tae-Hwan (School of Textiles, Yeungnam University)
Lyoo, Won-Seok (School of Textiles, Yeungnam University)
Jeon, Han-Yong (Division of Nano-systems Engineering, Inha University)
Publication Information
Polymer(Korea) / v.35, no.3, 2011 , pp. 203-209 More about this Journal
Abstract
Two smooth and textured surfaced HDPE 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 $50{\pm}1^{\circ}C$ 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.
Keywords
geomembranes; laboratory installation damage; loading cycles; stress crack behavior; NCTL test;
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