On the Use of Viscoplasticity to Describe Time-Dependent Behavior of Polyethylene Geomembranes.

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In this study the time-dependent behavior of geomembranes is modeled using elasto-viscoplasticity. For this purpose a particular time-rate rule, incorporating the consept of yield function from the traditional theory of plasticity, introduced. This time-rate rule is completely defined by three independent material parameters, which can be easily determined experimentally. The validity of the proposed approach is checked by comparison with experimental results of long-term tests on high-density polyethylene geomembranes.

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