Abstract
Tensile tests performed at different strain rates on HDPE geomembranes show that both the strength and the stiffness of the geomembrane decrease with a decrease in the strain rate. The quantification of the strain-rate dependent stress–strain response of HDPE geomembranes is crucial for the design of any geomembrane structure of which the geomembranes are strained at a lower rate than the rate at which laboratory tests are performed. Two simple mathematical models for the strain-rate dependent stress–strain behaviour of HDPE geomembranes under uniaxial loading conditions are presented. The models also provide a method for estimating the initial tangent modulus of the geomembrane. All the model parameters for both the models can be derived from uniaxial tensile tests performed at different strain rates.
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