Abstract:

Due to the mechanical properties and impact performance of the webbing sling were deteriorated sharply and its service life was affected in the recycling process, the dynamic fatigue resistance of the PET webbing sling through the specified elongation or fixed load process was studies. The results showed that the stretching properties of the flexible PET webbing sling were displayed three stages obviously, such as the hooke area, yield region and enhancing region. As smaller deformation (less than 1%) or load (less than 10% of the breaking strength), the elastic deformation was priority. In a large deformation or larger load, it showed the destructive plastic deformation, which accumulating with the repetitions increased. After dealing with the specified elongation or fixed load process, the breaking strength, elongation at break and fatigue resistance of the PET webbing sling were deteriorated sharply and the shock resistance was also decreased significantly, which greatly affect its service life.

Key words: webbing sling, fatigue resistance, specified elongation, fixed load, hysteresis loop