Abstract
The thermal effects of the necking in fiber drawing, with respect to the change of microstructure and deformation thermodynamics, have been studied in this paper. The microstructure change before and after necking was characterized by differential scanning calorimeter, revealing the significant variations of crystallinity of polyester (PET) fiber. According to the thermal effect feature during the fiber cold-drawing process, deformation thermodynamics is established to analyze the necking mechanism. Internal energy increase in polypropylene fiber may be caused by melting of crystal or stored elastic strain energy, while the internal energy of PET fiber decreases with time, probably caused by the induced crystallization.
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Acknowledgements
This work was supported by the National Natural Foundation of China (No. 51403099), the Hunan Education Department Program (No. 13C798), the University of South China Doctoral Scientific Research Foundation (No. 2013XQD35).
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Liao, Y., Shan, D., Liu, Z. et al. Thermal analysis of the necking phenomenon in fiber drawing. J Therm Anal Calorim 122, 323–327 (2015). https://doi.org/10.1007/s10973-015-4719-5
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DOI: https://doi.org/10.1007/s10973-015-4719-5