Polymer(Korea) (폴리머)

The Polymer Society of Korea (한국고분자학회)
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Analysis of Mechanical Properties and Stress Crack Behavior of HOPE Geomembranes by Laboratory Installation Damage Test

실내 시공시 손상시험에 의한 HDPE 지오멤브레인의 기계적 특성 및 응력균열거동 해석

  • 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)
  • ;
  • 박주희 (인하대학교 대학원 섬유공학과) ;
  • 김성희 (전남대학교 의류학과) ;
  • 장용채 (목포해양대학교 해양시스템공학부) ;
  • 오태환 (영남대학교 섬유패션학부) ;
  • 류원석 (영남대학교 섬유패션학부) ;
  • 전한용 (인하대학교 나노시스템공학부)
  • Received : 2010.10.20
  • Accepted : 2011.01.06
  • Published : 2011.05.25
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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.

표면이 매끄럽고 돌기가 있는 2가지 HDPE 지오멤브레인 덤벨형 시료에 두께 10% 간격으로 10~90% 깊이의 노치를 가하여 실험에 사용하였다. ISO 10722에 의거하여 부가하중 횟수를 변화시켜 시공시 손상의 실내 모사시험을 HDPE 지오브레인에 실시하였으며, 부가하중 횟수가 시공시 손상에 미치는 영향을 비교하였다. 항복응력과 변형률은 노지 깊이가 커짐에 따라 감소하였다. 손상된 그리고 노치를 가한 지오멤브레인을 응력균열시험에 사용하였으며, $50{\pm}1^{\circ}C$에서 pH 4와 12 용액에 침지시켜 항복응력 변화에 따른 응력균열저항성을 NCTL 시험을 통하여 고찰하였다. 인장 강도의 35% 이상에서 지오멤브레인은 응력균열에 취약함을 나타냈으며, 손상을 받은 그리고 노치를 가한 지오멤브레인 모두 같은 경향을 나타내었다. 특별히 노치를 가한 지오멤브레인의 경우 각각의 응력균열 조건에서 시공에 의해 손상된 지오멤브레인보다 낮은 강도를 나타내었다.

Keywords

References

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