高分子薄板之微热压成型的模拟分析林明俊机械系摘要本计划运用.PDF

教專研 098P-042 高分子薄板之微熱壓成型的模擬分析 高分子薄板之微熱壓成型的模擬分析 林明俊 機械系 摘要 本計劃運用有限元素法的理論來模擬分析高分子材料在熱壓過程中的成型行為。研 究中，針對 PMMA板材進行相關的材料實驗以獲得其流變特性，進而建立材料資料庫； 而後以建立之材料資料庫與有限元素分析模型進行PMMA微流道之熱壓模擬。模擬時採 用可同時考慮作用力及溫度效應的非線性黏彈性有限元素軟體 LS-DYNA ，有效地模擬出 在熱壓過程中高分子材料的流動情形以及建立以壓印溫度 及壓印作用力為參數的成型視 窗。研究結果證實，此有限元素模組能準確的模擬 PMMA 以熱壓製程成型微流道結構時 的行為。本研究除了探討高分 子熱壓製程且歸納出其關鍵參數的影響特性外，也建立了 橡膠態高分子的材料特性蒐集實驗方式及有限元素應用於微流道熱壓印行為的模式，相 關研究成果將可運用於其他工作溫度高於玻璃轉移溫度的高分子材料與製程。 關鍵字：有限元素法，非線性黏彈性，玻璃轉移溫度 Abstract This study adopted the finite element method (FEM) to analyze the molding behaviors of polymer PMMA. During the research procedures, a series of material property experiments are performed to determine the rheological characteristics of PMMA. The finite element material database is built using material properties from experiments. Subsequently, a simulation model of PMMA hot embossed micro-channels is constructed. The proposed simulation model is used to predict the applied embossing forces in various temperatures on the products. The nonlinear viscoelastic material model which depends on working pressure and temperature incorporated into FEM code LS-DYNA, and successfully simulated the flow situation of PMMA and the optimal molding window taking applied force and embossing temperature as parameters in hot embossing process. The results verify the FEM module that can accurately simulate the deformation behaviors of micro-channels structure in hot embossing process. This study besides sums up influence of key parameters in hot embossing process for the fabrication of micro-channels within a polymer substrate, the experimental methods for collecting the material characteristics of semi-molten polymers and the finite element material model established in this s