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    題名: Numerical Simulation for the Viscoelastic Effects on the Birefringence Variation for an Injected Optical Lens
    作者: Gwo-Geng Lin;De-Lung Lai;Chao-Tsai Huang;Chen-Chieh Wang;Yuan-Jung Chang;Rong-Yeu Chang
    關鍵詞: viscoelastic effects;Birefringence;optical lens
    日期: 201606
    上傳時間: 2016-11-15 02:10:47 (UTC+8)
    摘要: Recently, polymeric optical lens have been utilized in many fields and electronic devices, such as camera, mobile phone, tablet, and other optical devices. The quality is the key for the main suppliers to keep competition, however, how the material’s viscoelasticity influences the optical features is still not fully understood yet. In this study, we have investigated the viscoelastic effects on the optical property of a lens made of Zeonex COP 480R material by the traditional injection molding, simulated with n = 0.4 and τ* = 217,000 Pa in the Cross model for the melt viscosity. Results show that if the power-law index (n) was varied from 0.1 to 0.6, the total fringed order has no significant difference, but the fringed patterns were varying dominantly in the perpendicular direction, instead of the flow direction for the case at n = 0.4. This situation was matched with the distribution of the flow-induced residual stresses. Moreover, if the τ * in the Cross model was varied from 100,000 Pa to 300,000 Pa, the total fringed patterns were apparently changing from being dominated in the flow direction to being in the direction perpendicular to the flow. The influenced width of the fringed patterns was almost linearly increased with the increasing τ *. The results can be applied as some guideline for either the further material modifications or the new material developments.
    關聯: SPE ANTEC Indianapolis 2016, p.1231-1235
    顯示於類別:[化學工程與材料工程學系暨研究所] 期刊論文

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