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Nanostructure Changes in Nylon 5,6 Fibers under Tension owing to Hydrogen Bond Formation
조국현,김효정,이현휘 한국섬유공학회 2019 Fibers and polymers Vol.20 No.1
We investigated the effect of tension on the stable α-phase formation of nylon 5,6 fibers with two different drawing speeds using two-dimensional transmission wide angle X-ray scattering (2D WAXS) measurement. In an ex-situ condition, i.e., after releasing the applied tension and temperature, the relative amount of the α-phase in the fibers was higher at a higher drawing speed (57 mm/min). On the contrary, the development of the α-phase seemed faster and stronger during in-situ elongation of the fiber at a lower drawing speed (38 mm/min). The γ-phase, rather than the α-phase, played a key role in this complex behavior. The mechanical properties of the nylon fibers elongated under slow drawing speed (38 mm/min) were better than those elongated under a higher drawing speed (57 mm/min). The mechanical properties were more consistent in the case of α-phase formation in an in-situ condition under applied tension on the nylon fibers. Detailed structural information was obtained by quantitative analysis of the 2D WAXS data using an in-situ fiber drawing device.
조국현,노경호,강호정,박형욱,이재우,변영환,Cho, Guk-Hyun,Noh, Kyung-Ho,Kang, Ho-Jung,Park, Hyeong-Uk,Lee, Jae-Woo,Byun, Yung-Hwan 한국시스템엔지니어링학회 2007 시스템엔지니어링학술지 Vol.3 No.1
This paper presents a design methodology for developing a new cellular phone configuration. A case study is performed using robust design process to satisfy predicted needs from new customers under the requirement analysis process. Diagrams and selection matrices are drawn by using several useful system engineering methods. This paper presents the optimal LCD panel size of cellular phone. A structural analysis has been carried out to compare the deformation of LCD panel thickness at specific conditions by using ANSYS application tool. This entire design result can support the configuration and quality improvements for a new product for new customers.