Fibers and Polymers

, Volume 2, Issue 1, pp 18–21 | Cite as

Neck formation in drawing processes of fibers



To better understand the formation of necking in drawing processes of fibers, strain distributions during drawing processes have been analyzed. For simplicity, one-dimensional incompressible steady flow at a constant temperature was assumed and quasi-static model was used. To describe mechanical properties of solid polymers, non-linear visco-plastic material properties were assumed using the power law type hardening and rate-sensitive equation. The effects of various parameters on the neck formation were mathematically analyzed. As material property parameters, strain-hardening parameter, visco-elastic coefficient and strain-rate sensitivity were considered and, for process parameters, the drawing ratio and the process length were considered. It was found that rate-insensitive materials do not reach a steady flow state and the rate-sensitivity plays a key role to have a steady flow. Also, the neck formation is mainly affected by material properties, especially for the quasi-static model. If the process length changes, the strain distribution was found to be proportionally re-distributed along the process line by the factor of the total length change.


Necking Drawing process Quasi-static Rate-sensitivity 


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Copyright information

© The Korean Fiber Society 2001

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringSeoul National UniversitySeoulKorea

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