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논문 기본 정보

자료유형
학술저널
저자정보
Chung, Kwansoo (School of Materials Science and Engineering, Seoul National University) Yoon, Hyungsop (School of Materials Science and Engineering, Seoul National University) Youn, Jae Ryoun (School of Materials Science and Engineering, Seoul National University)
저널정보
한국섬유공학회 Fibers and Polymers Fibers and polymers 제2권 제1호
발행연도
2001.1
수록면
140 - 143 (4page)

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초록· 키워드

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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 matematically 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.

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