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Effect of notching speed on dynamic fatigue behaviour of polyethylene terephthalate polymers

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Abstract

The influence of notching speed on the fatigue behaviour of crystalline and amorphous polyethylene terephthalate (PET) was investigated. A clear precrack adjacent to the notch tip was found after each crystalline sample was notched, and the precrack length increased when the samples were notched at higher speeds. The failure time, t f, decreased significantly for samples with longer precrack lengths, and the decrease in t f due to faster notching speeds was significantly lower for samples of high average molecule weight and calculated tie-molecule density. In contrast, a heart-shaped damaged structure surrounding the notch tip was observed after each amorphous sample was notched, and the size of the damaged zone, adjacent to the notch tip, increased significantly with the notching speed. Furthermore, the time to failure of each amorphous sample increased significantly as the notching speed increased. In fact, most of the increase in t f is due to an increase in the initiation period, t i. This significant increase in t i is attributed to the larger damaged zone caused by higher notching speeds.

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Authors and Affiliations

  1. Department of Textile Engineering, National Taiwan Institute of Technology, 106, Taipei, Taiwan

    J. T. Yeh & Y. T. Lin

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  1. J. T. Yeh
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Yeh, J.T., Lin, Y.T. Effect of notching speed on dynamic fatigue behaviour of polyethylene terephthalate polymers. JOURNAL OF MATERIALS SCIENCE 28, 3900–3910 (1993). https://doi.org/10.1007/BF00353198

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