The stretching process of plastics geogrids is researched and the general rule of crystalline polymer samples’ stretching is summarized, based on the stretching experiment. According to the general principle of polymer material’s stretching, the experiment phenomena are explained, and the conditions about continuous and steady stretching of geogrids are discussed. The experiments show that if the neck-shaped parts on the sample are stretched in turn at longitudinal direction, the process will continue....
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