Laboratory experiment was conducted on the higll density polyethylene (HOPE) geomcmbranes. The geomembrane samples were subjected to temperature cycle by storing it in the oven and in the free7.er repeatedly. In the process, the edges of the sheet samples were subjected to three different boundary conditions; unrestrained, restrained in one direction, and restrained in both directions. The uniaxial tensile tests were performed at various tmnperature ranging from 20°C to -20°C. Variables considered were the number temperature cycles, the boundary conditions, thickness of the geomembranes, plain and seamed material, and the temperature. On the effects of temperature cycle, the results show no significant degradation on the stressstrain behavior of the material after being subjected to 150 low-high temperature cycles. On the effects of temperature at testing, the stress-strain diagrams indicate a pattern where decreasing temperature results in an increasing stress level at yield, and decreasing strain at yield, in addition, the ultimate strength is achieved at lower strains level indicating the increase of embrittlement.
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