Abstract
This chapter presents model and model parameters for uniaxial load and moderate changes in the thermal boundary conditions. On the one hand thermal induced tensile stresses represent an additional load in the material which can be the cause for unexpected failure. On the other hand stresses relax upon time and temperature. The higher the temperature the higher the relaxation potential. Therefore, the analytical calculation of thermally induced stresses is extremely difficult. Numerical models open the possibility to predict thermally induced stresses in order to know if the thermal history of plastic part is relevant for possible unexpected failure. These models are capable of a very good prediction of the stress curves. With this method it is possible to determine critical strain and thermal load cases. Also, this tool can be helpful to estimate the life time of plastic parts which are used under changing thermal conditions. The results reveal that even without prestrain a significant tensile stress can be induced in a geomembrane.
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