Abstract
The liner sheet installed in a waste landfill is made of a synthetic resin and a synthetic rubber as the main ingredients, and behaves as a typical visco-elasticity. If it is left after a constant strain has given, stress relaxation will occur with time. The liner sheets used in this research are HDPE, FPA and TPO, and each thickness is 1.5mm. Experimental equipment consists of load transducer which measure the tension force, a specimen attachment clamp, a screw moving the clamp and an iron frame. In this research, stress relaxation experiments were conducted in many stages and a constant distortion. Furthermore, comparison between the experiment result and calculation values which was estimated by three-element visco-elastic model was performed.
