Ar-glass filament material law for arbitrary quasi-static long-term loading

The tensile load carrying behaviour of filaments made of alkali-resistant glass, which is the basic component of textile reinforcements used for textile reinforced concrete, was analysed for quasi-static long-term loading. Therefore, tensile tests under cyclic and constant long-term loading at different stress levels, different loading rates and different loading amplitudes were carried out. A strength degradation, which led in some cases to a failure of the specimens during the long-term load, could be observed. A strength degradation model was introduced, whereas different approaches were considered. The model parameters were identified from the experimental data using a hybrid optimisation method. As a direct application of the determined strength degradation law, the fatigue strength limit was calculated for different loading rates.